diff --git a/core/modules/action/tests/src/Functional/ActionUninstallTest.php b/core/modules/action/tests/src/Functional/ActionUninstallTest.php
index 93e0bc0..ea4cabb 100644
--- a/core/modules/action/tests/src/Functional/ActionUninstallTest.php
+++ b/core/modules/action/tests/src/Functional/ActionUninstallTest.php
@@ -17,7 +17,7 @@ class ActionUninstallTest extends BrowserTestBase {
    *
    * @var array
    */
-  public static $modules = array('views', 'action');
+  protected static $modules = array('views', 'action');
 
   /**
    * Tests Action uninstall.
diff --git a/core/modules/action/tests/src/Functional/BulkFormTest.php b/core/modules/action/tests/src/Functional/BulkFormTest.php
index 7d32b94..7c5179e 100644
--- a/core/modules/action/tests/src/Functional/BulkFormTest.php
+++ b/core/modules/action/tests/src/Functional/BulkFormTest.php
@@ -18,7 +18,7 @@ class BulkFormTest extends BrowserTestBase {
    *
    * @var array
    */
-  public static $modules = array('node', 'action_bulk_test');
+  protected static $modules = array('node', 'action_bulk_test');
 
   /**
    * Tests the bulk form.
diff --git a/core/modules/action/tests/src/Functional/ConfigurationTest.php b/core/modules/action/tests/src/Functional/ConfigurationTest.php
index 23d0a38..88a2856 100644
--- a/core/modules/action/tests/src/Functional/ConfigurationTest.php
+++ b/core/modules/action/tests/src/Functional/ConfigurationTest.php
@@ -19,7 +19,7 @@ class ConfigurationTest extends BrowserTestBase {
    *
    * @var array
    */
-  public static $modules = array('action');
+  protected static $modules = array('action');
 
   /**
    * Tests configuration of advanced actions through administration interface.
diff --git a/core/modules/action/tests/src/Kernel/Migrate/d6/MigrateActionConfigsTest.php b/core/modules/action/tests/src/Kernel/Migrate/d6/MigrateActionConfigsTest.php
index 0ee1869..ee88ea3 100644
--- a/core/modules/action/tests/src/Kernel/Migrate/d6/MigrateActionConfigsTest.php
+++ b/core/modules/action/tests/src/Kernel/Migrate/d6/MigrateActionConfigsTest.php
@@ -17,7 +17,7 @@ class MigrateActionConfigsTest extends MigrateDrupal6TestBase {
   /**
    * {@inheritdoc}
    */
-  public static $modules = ['action'];
+  protected static $modules = ['action'];
 
   /**
    * {@inheritdoc}
diff --git a/core/modules/action/tests/src/Kernel/Migrate/d6/MigrateActionsTest.php b/core/modules/action/tests/src/Kernel/Migrate/d6/MigrateActionsTest.php
index 1737715..13a3c2c 100644
--- a/core/modules/action/tests/src/Kernel/Migrate/d6/MigrateActionsTest.php
+++ b/core/modules/action/tests/src/Kernel/Migrate/d6/MigrateActionsTest.php
@@ -12,7 +12,7 @@
  */
 class MigrateActionsTest extends MigrateDrupal6TestBase {
 
-  public static $modules = ['action', 'comment', 'node'];
+  protected static $modules = ['action', 'comment', 'node'];
 
   /**
    * {@inheritdoc}
diff --git a/core/modules/action/tests/src/Kernel/Migrate/d7/MigrateActionConfigsTest.php b/core/modules/action/tests/src/Kernel/Migrate/d7/MigrateActionConfigsTest.php
index 04d0ec9..7d0e6a9 100644
--- a/core/modules/action/tests/src/Kernel/Migrate/d7/MigrateActionConfigsTest.php
+++ b/core/modules/action/tests/src/Kernel/Migrate/d7/MigrateActionConfigsTest.php
@@ -17,7 +17,7 @@ class MigrateActionConfigsTest extends MigrateDrupal7TestBase {
   /**
    * {@inheritdoc}
    */
-  public static $modules = ['action'];
+  protected static $modules = ['action'];
 
   /**
    * {@inheritdoc}
diff --git a/core/modules/action/tests/src/Kernel/Migrate/d7/MigrateActionsTest.php b/core/modules/action/tests/src/Kernel/Migrate/d7/MigrateActionsTest.php
index 1601449..feadb44 100644
--- a/core/modules/action/tests/src/Kernel/Migrate/d7/MigrateActionsTest.php
+++ b/core/modules/action/tests/src/Kernel/Migrate/d7/MigrateActionsTest.php
@@ -12,7 +12,7 @@
  */
 class MigrateActionsTest extends MigrateDrupal7TestBase {
 
-  public static $modules = ['action', 'comment', 'node'];
+  protected static $modules = ['action', 'comment', 'node'];
 
   /**
    * {@inheritdoc}
diff --git a/core/modules/action/tests/src/Kernel/Plugin/migrate/source/ActionTest.php b/core/modules/action/tests/src/Kernel/Plugin/migrate/source/ActionTest.php
index 7f7b7ef..bafdeb4 100644
--- a/core/modules/action/tests/src/Kernel/Plugin/migrate/source/ActionTest.php
+++ b/core/modules/action/tests/src/Kernel/Plugin/migrate/source/ActionTest.php
@@ -15,7 +15,7 @@ class ActionTest extends MigrateSqlSourceTestBase {
   /**
    * {@inheritdoc}
    */
-  public static $modules = ['action', 'migrate_drupal'];
+  protected static $modules = ['action', 'migrate_drupal'];
 
   /**
    * {@inheritdoc}
diff --git a/core/modules/aggregator/tests/src/Kernel/AggregatorTitleTest.php b/core/modules/aggregator/tests/src/Kernel/AggregatorTitleTest.php
index 782ac6f..dd9f7e7 100644
--- a/core/modules/aggregator/tests/src/Kernel/AggregatorTitleTest.php
+++ b/core/modules/aggregator/tests/src/Kernel/AggregatorTitleTest.php
@@ -19,7 +19,7 @@ class AggregatorTitleTest extends KernelTestBase {
    *
    * @var array
    */
-  public static $modules = ['file', 'field', 'options', 'aggregator', 'system'];
+  protected static $modules = ['file', 'field', 'options', 'aggregator', 'system'];
 
   /**
    * The field name that is tested.
diff --git a/core/modules/aggregator/tests/src/Kernel/FeedValidationTest.php b/core/modules/aggregator/tests/src/Kernel/FeedValidationTest.php
index 81a501e..52e5cbc 100644
--- a/core/modules/aggregator/tests/src/Kernel/FeedValidationTest.php
+++ b/core/modules/aggregator/tests/src/Kernel/FeedValidationTest.php
@@ -17,7 +17,7 @@ class FeedValidationTest extends EntityKernelTestBase {
    *
    * @var array
    */
-  public static $modules = array('aggregator', 'options');
+  protected static $modules = array('aggregator', 'options');
 
   /**
    * {@inheritdoc}
diff --git a/core/modules/aggregator/tests/src/Kernel/ItemWithoutFeedTest.php b/core/modules/aggregator/tests/src/Kernel/ItemWithoutFeedTest.php
index e44bd4f..705c4b6 100644
--- a/core/modules/aggregator/tests/src/Kernel/ItemWithoutFeedTest.php
+++ b/core/modules/aggregator/tests/src/Kernel/ItemWithoutFeedTest.php
@@ -15,7 +15,7 @@ class ItemWithoutFeedTest extends KernelTestBase {
   /**
    * {@inheritdoc}
    */
-  public static $modules = ['aggregator', 'options'];
+  protected static $modules = ['aggregator', 'options'];
 
   /**
    * {@inheritdoc}
diff --git a/core/modules/aggregator/tests/src/Kernel/Migrate/MigrateAggregatorStubTest.php b/core/modules/aggregator/tests/src/Kernel/Migrate/MigrateAggregatorStubTest.php
index 6d96aa1..5bf0dba 100644
--- a/core/modules/aggregator/tests/src/Kernel/Migrate/MigrateAggregatorStubTest.php
+++ b/core/modules/aggregator/tests/src/Kernel/Migrate/MigrateAggregatorStubTest.php
@@ -18,7 +18,7 @@ class MigrateAggregatorStubTest extends MigrateDrupalTestBase {
   /**
    * {@inheritdoc}
    */
-  public static $modules = ['aggregator'];
+  protected static $modules = ['aggregator'];
 
   /**
    * {@inheritdoc}
diff --git a/core/modules/aggregator/tests/src/Kernel/Migrate/d6/MigrateAggregatorConfigsTest.php b/core/modules/aggregator/tests/src/Kernel/Migrate/d6/MigrateAggregatorConfigsTest.php
index de6c87e..9f8ba54 100644
--- a/core/modules/aggregator/tests/src/Kernel/Migrate/d6/MigrateAggregatorConfigsTest.php
+++ b/core/modules/aggregator/tests/src/Kernel/Migrate/d6/MigrateAggregatorConfigsTest.php
@@ -17,7 +17,7 @@ class MigrateAggregatorConfigsTest extends MigrateDrupal6TestBase {
   /**
    * {@inheritdoc}
    */
-  public static $modules = ['aggregator'];
+  protected static $modules = ['aggregator'];
 
   /**
    * {@inheritdoc}
diff --git a/core/modules/aggregator/tests/src/Kernel/Migrate/d6/MigrateAggregatorFeedTest.php b/core/modules/aggregator/tests/src/Kernel/Migrate/d6/MigrateAggregatorFeedTest.php
index 9dac60f..eef5ba4 100644
--- a/core/modules/aggregator/tests/src/Kernel/Migrate/d6/MigrateAggregatorFeedTest.php
+++ b/core/modules/aggregator/tests/src/Kernel/Migrate/d6/MigrateAggregatorFeedTest.php
@@ -15,7 +15,7 @@ class MigrateAggregatorFeedTest extends MigrateDrupal6TestBase {
   /**
    * {@inheritdoc}
    */
-  public static $modules = ['aggregator'];
+  protected static $modules = ['aggregator'];
 
   /**
    * {@inheritdoc}
diff --git a/core/modules/aggregator/tests/src/Kernel/Migrate/d6/MigrateAggregatorItemTest.php b/core/modules/aggregator/tests/src/Kernel/Migrate/d6/MigrateAggregatorItemTest.php
index 5343d1e..d14846c 100644
--- a/core/modules/aggregator/tests/src/Kernel/Migrate/d6/MigrateAggregatorItemTest.php
+++ b/core/modules/aggregator/tests/src/Kernel/Migrate/d6/MigrateAggregatorItemTest.php
@@ -15,7 +15,7 @@ class MigrateAggregatorItemTest extends MigrateDrupal6TestBase {
   /**
    * {@inheritdoc}
    */
-  public static $modules = ['aggregator'];
+  protected static $modules = ['aggregator'];
 
   /**
    * {@inheritdoc}
diff --git a/core/modules/aggregator/tests/src/Kernel/Migrate/d7/MigrateAggregatorFeedTest.php b/core/modules/aggregator/tests/src/Kernel/Migrate/d7/MigrateAggregatorFeedTest.php
index fd20823..e4dbe34 100644
--- a/core/modules/aggregator/tests/src/Kernel/Migrate/d7/MigrateAggregatorFeedTest.php
+++ b/core/modules/aggregator/tests/src/Kernel/Migrate/d7/MigrateAggregatorFeedTest.php
@@ -15,7 +15,7 @@ class MigrateAggregatorFeedTest extends MigrateDrupal7TestBase {
   /**
    * {@inheritdoc}
    */
-  public static $modules = ['aggregator'];
+  protected static $modules = ['aggregator'];
 
   /**
    * {@inheritdoc}
diff --git a/core/modules/aggregator/tests/src/Kernel/Migrate/d7/MigrateAggregatorItemTest.php b/core/modules/aggregator/tests/src/Kernel/Migrate/d7/MigrateAggregatorItemTest.php
index 83e59d9..8dde35b 100644
--- a/core/modules/aggregator/tests/src/Kernel/Migrate/d7/MigrateAggregatorItemTest.php
+++ b/core/modules/aggregator/tests/src/Kernel/Migrate/d7/MigrateAggregatorItemTest.php
@@ -15,7 +15,7 @@ class MigrateAggregatorItemTest extends MigrateDrupal7TestBase {
   /**
    * {@inheritdoc}
    */
-  public static $modules = ['aggregator'];
+  protected static $modules = ['aggregator'];
 
   /**
    * {@inheritdoc}
diff --git a/core/modules/aggregator/tests/src/Kernel/Migrate/d7/MigrateAggregatorSettingsTest.php b/core/modules/aggregator/tests/src/Kernel/Migrate/d7/MigrateAggregatorSettingsTest.php
index 0fa8f63..9e2eb36 100644
--- a/core/modules/aggregator/tests/src/Kernel/Migrate/d7/MigrateAggregatorSettingsTest.php
+++ b/core/modules/aggregator/tests/src/Kernel/Migrate/d7/MigrateAggregatorSettingsTest.php
@@ -11,7 +11,7 @@
  */
 class MigrateAggregatorSettingsTest extends MigrateDrupal7TestBase {
 
-  public static $modules = ['aggregator'];
+  protected static $modules = ['aggregator'];
 
   /**
    * {@inheritdoc}
diff --git a/core/modules/aggregator/tests/src/Kernel/Plugin/migrate/source/AggregatorFeedTest.php b/core/modules/aggregator/tests/src/Kernel/Plugin/migrate/source/AggregatorFeedTest.php
index d41f4f4..67fe136 100644
--- a/core/modules/aggregator/tests/src/Kernel/Plugin/migrate/source/AggregatorFeedTest.php
+++ b/core/modules/aggregator/tests/src/Kernel/Plugin/migrate/source/AggregatorFeedTest.php
@@ -15,7 +15,7 @@ class AggregatorFeedTest extends MigrateSqlSourceTestBase {
   /**
    * {@inheritdoc}
    */
-  public static $modules = ['aggregator', 'migrate_drupal'];
+  protected static $modules = ['aggregator', 'migrate_drupal'];
 
   /**
    * {@inheritdoc}
diff --git a/core/modules/aggregator/tests/src/Kernel/Plugin/migrate/source/AggregatorItemTest.php b/core/modules/aggregator/tests/src/Kernel/Plugin/migrate/source/AggregatorItemTest.php
index 09101f7..ea9206a 100644
--- a/core/modules/aggregator/tests/src/Kernel/Plugin/migrate/source/AggregatorItemTest.php
+++ b/core/modules/aggregator/tests/src/Kernel/Plugin/migrate/source/AggregatorItemTest.php
@@ -15,7 +15,7 @@ class AggregatorItemTest extends MigrateSqlSourceTestBase {
   /**
    * {@inheritdoc}
    */
-  public static $modules = ['aggregator', 'migrate_drupal'];
+  protected static $modules = ['aggregator', 'migrate_drupal'];
 
   /**
    * {@inheritdoc}
diff --git a/core/modules/aggregator/tests/src/Kernel/Views/AggregatorFeedViewsFieldAccessTest.php b/core/modules/aggregator/tests/src/Kernel/Views/AggregatorFeedViewsFieldAccessTest.php
index d0ca46e..2d5a5f5 100644
--- a/core/modules/aggregator/tests/src/Kernel/Views/AggregatorFeedViewsFieldAccessTest.php
+++ b/core/modules/aggregator/tests/src/Kernel/Views/AggregatorFeedViewsFieldAccessTest.php
@@ -15,7 +15,7 @@ class AggregatorFeedViewsFieldAccessTest extends FieldFieldAccessTestBase {
   /**
    * {@inheritdoc}
    */
-  public static $modules = ['aggregator', 'entity_test', 'options'];
+  protected static $modules = ['aggregator', 'entity_test', 'options'];
 
   /**
    * {@inheritdoc}
diff --git a/core/modules/aggregator/tests/src/Kernel/Views/AggregatorItemViewsFieldAccessTest.php b/core/modules/aggregator/tests/src/Kernel/Views/AggregatorItemViewsFieldAccessTest.php
index a095d3c..a016467 100644
--- a/core/modules/aggregator/tests/src/Kernel/Views/AggregatorItemViewsFieldAccessTest.php
+++ b/core/modules/aggregator/tests/src/Kernel/Views/AggregatorItemViewsFieldAccessTest.php
@@ -16,7 +16,7 @@ class AggregatorItemViewsFieldAccessTest extends FieldFieldAccessTestBase {
   /**
    * {@inheritdoc}
    */
-  public static $modules = ['aggregator', 'entity_test', 'options'];
+  protected static $modules = ['aggregator', 'entity_test', 'options'];
 
   /**
    * {@inheritdoc}
diff --git a/core/modules/aggregator/tests/src/Kernel/Views/IntegrationTest.php b/core/modules/aggregator/tests/src/Kernel/Views/IntegrationTest.php
index a72da23..4908b18 100644
--- a/core/modules/aggregator/tests/src/Kernel/Views/IntegrationTest.php
+++ b/core/modules/aggregator/tests/src/Kernel/Views/IntegrationTest.php
@@ -21,7 +21,7 @@ class IntegrationTest extends ViewsKernelTestBase {
    *
    * @var array
    */
-  public static $modules = array('aggregator', 'aggregator_test_views', 'system', 'field', 'options', 'user');
+  protected static $modules = array('aggregator', 'aggregator_test_views', 'system', 'field', 'options', 'user');
 
   /**
    * Views used by this test.
diff --git a/core/modules/ban/tests/src/Functional/IpAddressBlockingTest.php b/core/modules/ban/tests/src/Functional/IpAddressBlockingTest.php
index 9738915..0be2778 100644
--- a/core/modules/ban/tests/src/Functional/IpAddressBlockingTest.php
+++ b/core/modules/ban/tests/src/Functional/IpAddressBlockingTest.php
@@ -18,7 +18,7 @@ class IpAddressBlockingTest extends BrowserTestBase {
    *
    * @var array
    */
-  public static $modules = array('ban');
+  protected static $modules = array('ban');
 
   /**
    * Tests various user input to confirm correct validation and saving of data.
diff --git a/core/modules/ban/tests/src/Kernel/Migrate/d7/MigrateBlockedIPsTest.php b/core/modules/ban/tests/src/Kernel/Migrate/d7/MigrateBlockedIPsTest.php
index c98d417..0455a51 100644
--- a/core/modules/ban/tests/src/Kernel/Migrate/d7/MigrateBlockedIPsTest.php
+++ b/core/modules/ban/tests/src/Kernel/Migrate/d7/MigrateBlockedIPsTest.php
@@ -19,7 +19,7 @@ class MigrateBlockedIPsTest extends MigrateDrupal7TestBase {
    *
    * @var array
    */
-  public static $modules = ['ban'];
+  protected static $modules = ['ban'];
 
   /**
    * {@inheritdoc}
diff --git a/core/modules/ban/tests/src/Kernel/Plugin/migrate/source/d7/BlockedIpsTest.php b/core/modules/ban/tests/src/Kernel/Plugin/migrate/source/d7/BlockedIpsTest.php
index 267cc34..7ce8f73 100644
--- a/core/modules/ban/tests/src/Kernel/Plugin/migrate/source/d7/BlockedIpsTest.php
+++ b/core/modules/ban/tests/src/Kernel/Plugin/migrate/source/d7/BlockedIpsTest.php
@@ -15,7 +15,7 @@ class BlockedIpsTest extends MigrateSqlSourceTestBase {
   /**
    * {@inheritdoc}
    */
-  public static $modules = ['ban', 'migrate_drupal'];
+  protected static $modules = ['ban', 'migrate_drupal'];
 
   /**
    * {@inheritdoc}
diff --git a/core/modules/big_pipe/tests/src/FunctionalJavascript/BigPipeRegressionTest.php b/core/modules/big_pipe/tests/src/FunctionalJavascript/BigPipeRegressionTest.php
index a99d5fc..e6afc8b 100644
--- a/core/modules/big_pipe/tests/src/FunctionalJavascript/BigPipeRegressionTest.php
+++ b/core/modules/big_pipe/tests/src/FunctionalJavascript/BigPipeRegressionTest.php
@@ -29,7 +29,7 @@ class BigPipeRegressionTest extends JavascriptTestBase {
   /**
    * {@inheritdoc}
    */
-  public static $modules = [
+  protected static $modules = [
     'big_pipe',
     'big_pipe_regression_test',
   ];
diff --git a/core/modules/block/tests/src/Kernel/BlockConfigSchemaTest.php b/core/modules/block/tests/src/Kernel/BlockConfigSchemaTest.php
index 3f7d778..05f3d2f 100644
--- a/core/modules/block/tests/src/Kernel/BlockConfigSchemaTest.php
+++ b/core/modules/block/tests/src/Kernel/BlockConfigSchemaTest.php
@@ -18,7 +18,7 @@ class BlockConfigSchemaTest extends KernelTestBase {
   /**
    * {@inheritdoc}
    */
-  public static $modules = array(
+  protected static $modules = array(
     'block',
     'aggregator',
     'book',
diff --git a/core/modules/block/tests/src/Kernel/BlockInterfaceTest.php b/core/modules/block/tests/src/Kernel/BlockInterfaceTest.php
index 9216d49..51ededd 100644
--- a/core/modules/block/tests/src/Kernel/BlockInterfaceTest.php
+++ b/core/modules/block/tests/src/Kernel/BlockInterfaceTest.php
@@ -13,7 +13,7 @@
  */
 class BlockInterfaceTest extends KernelTestBase {
 
-  public static $modules = array('system', 'block', 'block_test', 'user');
+  protected static $modules = array('system', 'block', 'block_test', 'user');
 
   /**
    * Test configuration and subsequent form() and build() method calls.
diff --git a/core/modules/block/tests/src/Kernel/BlockRebuildTest.php b/core/modules/block/tests/src/Kernel/BlockRebuildTest.php
index 33de12c..9e2611e 100644
--- a/core/modules/block/tests/src/Kernel/BlockRebuildTest.php
+++ b/core/modules/block/tests/src/Kernel/BlockRebuildTest.php
@@ -19,7 +19,7 @@ class BlockRebuildTest extends KernelTestBase {
   /**
    * {@inheritdoc}
    */
-  public static $modules = ['block', 'system'];
+  protected static $modules = ['block', 'system'];
 
   /**
    * {@inheritdoc}
diff --git a/core/modules/block/tests/src/Kernel/BlockStorageUnitTest.php b/core/modules/block/tests/src/Kernel/BlockStorageUnitTest.php
index 5704476..b69363d 100644
--- a/core/modules/block/tests/src/Kernel/BlockStorageUnitTest.php
+++ b/core/modules/block/tests/src/Kernel/BlockStorageUnitTest.php
@@ -21,7 +21,7 @@ class BlockStorageUnitTest extends KernelTestBase {
    *
    * @var array
    */
-  public static $modules = array('block', 'block_test', 'system');
+  protected static $modules = array('block', 'block_test', 'system');
 
   /**
    * The block storage.
diff --git a/core/modules/block/tests/src/Kernel/BlockViewBuilderTest.php b/core/modules/block/tests/src/Kernel/BlockViewBuilderTest.php
index 64b2109..cba7d2e 100644
--- a/core/modules/block/tests/src/Kernel/BlockViewBuilderTest.php
+++ b/core/modules/block/tests/src/Kernel/BlockViewBuilderTest.php
@@ -20,7 +20,7 @@ class BlockViewBuilderTest extends KernelTestBase {
    *
    * @var array
    */
-  public static $modules = array('block', 'block_test', 'system', 'user');
+  protected static $modules = array('block', 'block_test', 'system', 'user');
 
   /**
    * The block being tested.
diff --git a/core/modules/block/tests/src/Kernel/Migrate/d6/MigrateBlockTest.php b/core/modules/block/tests/src/Kernel/Migrate/d6/MigrateBlockTest.php
index c5dfba2..2d8baf2 100644
--- a/core/modules/block/tests/src/Kernel/Migrate/d6/MigrateBlockTest.php
+++ b/core/modules/block/tests/src/Kernel/Migrate/d6/MigrateBlockTest.php
@@ -15,7 +15,7 @@ class MigrateBlockTest extends MigrateDrupal6TestBase {
   /**
    * {@inheritdoc}
    */
-  public static $modules = [
+  protected static $modules = [
     'block',
     'views',
     'comment',
diff --git a/core/modules/block/tests/src/Kernel/Migrate/d7/MigrateBlockTest.php b/core/modules/block/tests/src/Kernel/Migrate/d7/MigrateBlockTest.php
index 6f07dc9..8028cbc 100644
--- a/core/modules/block/tests/src/Kernel/Migrate/d7/MigrateBlockTest.php
+++ b/core/modules/block/tests/src/Kernel/Migrate/d7/MigrateBlockTest.php
@@ -16,7 +16,7 @@ class MigrateBlockTest extends MigrateDrupal7TestBase {
   /**
    * {@inheritdoc}
    */
-  public static $modules = [
+  protected static $modules = [
     'block',
     'views',
     'comment',
diff --git a/core/modules/block/tests/src/Kernel/Plugin/migrate/source/BlockTest.php b/core/modules/block/tests/src/Kernel/Plugin/migrate/source/BlockTest.php
index d37f8c7..1c47f82 100644
--- a/core/modules/block/tests/src/Kernel/Plugin/migrate/source/BlockTest.php
+++ b/core/modules/block/tests/src/Kernel/Plugin/migrate/source/BlockTest.php
@@ -15,7 +15,7 @@ class BlockTest extends MigrateSqlSourceTestBase {
   /**
    * {@inheritdoc}
    */
-  public static $modules = ['block', 'migrate_drupal'];
+  protected static $modules = ['block', 'migrate_drupal'];
 
   /**
    * {@inheritdoc}
diff --git a/core/modules/block_content/tests/src/Kernel/BlockContentDeletionTest.php b/core/modules/block_content/tests/src/Kernel/BlockContentDeletionTest.php
index e54b2d3..2274750 100644
--- a/core/modules/block_content/tests/src/Kernel/BlockContentDeletionTest.php
+++ b/core/modules/block_content/tests/src/Kernel/BlockContentDeletionTest.php
@@ -17,7 +17,7 @@ class BlockContentDeletionTest extends KernelTestBase {
   /**
    * {@inheritdoc}
    */
-  public static $modules = ['block', 'block_content', 'system', 'user'];
+  protected static $modules = ['block', 'block_content', 'system', 'user'];
 
   /**
    * {@inheritdoc}
diff --git a/core/modules/block_content/tests/src/Kernel/Migrate/MigrateBlockContentBodyFieldTest.php b/core/modules/block_content/tests/src/Kernel/Migrate/MigrateBlockContentBodyFieldTest.php
index 0bf29fd..a4331c5 100644
--- a/core/modules/block_content/tests/src/Kernel/Migrate/MigrateBlockContentBodyFieldTest.php
+++ b/core/modules/block_content/tests/src/Kernel/Migrate/MigrateBlockContentBodyFieldTest.php
@@ -15,7 +15,7 @@
  */
 class MigrateBlockContentBodyFieldTest extends MigrateDrupal7TestBase {
 
-  public static $modules = array('block', 'block_content', 'filter', 'text');
+  protected static $modules = array('block', 'block_content', 'filter', 'text');
 
   /**
    * {@inheritdoc}
diff --git a/core/modules/block_content/tests/src/Kernel/Migrate/MigrateBlockContentStubTest.php b/core/modules/block_content/tests/src/Kernel/Migrate/MigrateBlockContentStubTest.php
index 1958039..a6356ed 100644
--- a/core/modules/block_content/tests/src/Kernel/Migrate/MigrateBlockContentStubTest.php
+++ b/core/modules/block_content/tests/src/Kernel/Migrate/MigrateBlockContentStubTest.php
@@ -19,7 +19,7 @@ class MigrateBlockContentStubTest extends MigrateDrupalTestBase {
   /**
    * {@inheritdoc}
    */
-  public static $modules = ['block_content'];
+  protected static $modules = ['block_content'];
 
   /**
    * {@inheritdoc}
diff --git a/core/modules/block_content/tests/src/Kernel/Migrate/MigrateBlockContentTypeTest.php b/core/modules/block_content/tests/src/Kernel/Migrate/MigrateBlockContentTypeTest.php
index 9a3cbf0..6004944 100644
--- a/core/modules/block_content/tests/src/Kernel/Migrate/MigrateBlockContentTypeTest.php
+++ b/core/modules/block_content/tests/src/Kernel/Migrate/MigrateBlockContentTypeTest.php
@@ -13,7 +13,7 @@
  */
 class MigrateBlockContentTypeTest extends MigrateDrupal7TestBase {
 
-  public static $modules = array('block', 'block_content', 'filter', 'text');
+  protected static $modules = array('block', 'block_content', 'filter', 'text');
 
   /**
    * {@inheritdoc}
diff --git a/core/modules/block_content/tests/src/Kernel/Migrate/d6/MigrateBlockContentTest.php b/core/modules/block_content/tests/src/Kernel/Migrate/d6/MigrateBlockContentTest.php
index bb5ba89..aa55668 100644
--- a/core/modules/block_content/tests/src/Kernel/Migrate/d6/MigrateBlockContentTest.php
+++ b/core/modules/block_content/tests/src/Kernel/Migrate/d6/MigrateBlockContentTest.php
@@ -15,7 +15,7 @@ class MigrateBlockContentTest extends MigrateDrupal6TestBase {
   /**
    * {@inheritdoc}
    */
-  public static $modules = ['block', 'block_content'];
+  protected static $modules = ['block', 'block_content'];
 
   /**
    * {@inheritdoc}
diff --git a/core/modules/block_content/tests/src/Kernel/Migrate/d7/MigrateCustomBlockTest.php b/core/modules/block_content/tests/src/Kernel/Migrate/d7/MigrateCustomBlockTest.php
index 42990db..b8d3def 100644
--- a/core/modules/block_content/tests/src/Kernel/Migrate/d7/MigrateCustomBlockTest.php
+++ b/core/modules/block_content/tests/src/Kernel/Migrate/d7/MigrateCustomBlockTest.php
@@ -13,7 +13,7 @@
  */
 class MigrateCustomBlockTest extends MigrateDrupal7TestBase {
 
-  public static $modules = array(
+  protected static $modules = array(
     'block_content',
     'filter',
     'text',
diff --git a/core/modules/block_content/tests/src/Kernel/Plugin/migrate/source/d6/BoxTest.php b/core/modules/block_content/tests/src/Kernel/Plugin/migrate/source/d6/BoxTest.php
index 22ab03c..7f84eb5 100644
--- a/core/modules/block_content/tests/src/Kernel/Plugin/migrate/source/d6/BoxTest.php
+++ b/core/modules/block_content/tests/src/Kernel/Plugin/migrate/source/d6/BoxTest.php
@@ -15,7 +15,7 @@ class BoxTest extends MigrateSqlSourceTestBase {
   /**
    * {@inheritdoc}
    */
-  public static $modules = ['block_content', 'migrate_drupal'];
+  protected static $modules = ['block_content', 'migrate_drupal'];
 
   /**
    * {@inheritdoc}
diff --git a/core/modules/block_content/tests/src/Kernel/Plugin/migrate/source/d7/BlockCustomTest.php b/core/modules/block_content/tests/src/Kernel/Plugin/migrate/source/d7/BlockCustomTest.php
index 55419e3..3a2e02d 100644
--- a/core/modules/block_content/tests/src/Kernel/Plugin/migrate/source/d7/BlockCustomTest.php
+++ b/core/modules/block_content/tests/src/Kernel/Plugin/migrate/source/d7/BlockCustomTest.php
@@ -15,7 +15,7 @@ class BlockCustomTest extends MigrateSqlSourceTestBase {
   /**
    * {@inheritdoc}
    */
-  public static $modules = ['block_content', 'migrate_drupal'];
+  protected static $modules = ['block_content', 'migrate_drupal'];
 
   /**
    * {@inheritdoc}
diff --git a/core/modules/block_place/tests/src/Functional/BlockPlaceTest.php b/core/modules/block_place/tests/src/Functional/BlockPlaceTest.php
index 8e89048..919be0c 100644
--- a/core/modules/block_place/tests/src/Functional/BlockPlaceTest.php
+++ b/core/modules/block_place/tests/src/Functional/BlockPlaceTest.php
@@ -17,7 +17,7 @@ class BlockPlaceTest extends BrowserTestBase {
    *
    * @var array
    */
-  public static $modules = ['block', 'block_place', 'toolbar'];
+  protected static $modules = ['block', 'block_place', 'toolbar'];
 
   /**
    * Tests placing blocks as an admin.
diff --git a/core/modules/book/tests/src/FunctionalJavascript/BookJavascriptTest.php b/core/modules/book/tests/src/FunctionalJavascript/BookJavascriptTest.php
index e895b68..df204b6 100644
--- a/core/modules/book/tests/src/FunctionalJavascript/BookJavascriptTest.php
+++ b/core/modules/book/tests/src/FunctionalJavascript/BookJavascriptTest.php
@@ -17,7 +17,7 @@ class BookJavascriptTest extends JavascriptTestBase {
   /**
    * {@inheritdoc}
    */
-  public static $modules = ['book'];
+  protected static $modules = ['book'];
 
   /**
    * Tests re-ordering of books.
diff --git a/core/modules/book/tests/src/Kernel/BookUninstallTest.php b/core/modules/book/tests/src/Kernel/BookUninstallTest.php
index bcd0812..3e0b205 100644
--- a/core/modules/book/tests/src/Kernel/BookUninstallTest.php
+++ b/core/modules/book/tests/src/Kernel/BookUninstallTest.php
@@ -18,7 +18,7 @@ class BookUninstallTest extends KernelTestBase {
    *
    * @var array
    */
-  public static $modules = ['system', 'user', 'field', 'filter', 'text', 'node', 'book'];
+  protected static $modules = ['system', 'user', 'field', 'filter', 'text', 'node', 'book'];
 
   /**
    * {@inheritdoc}
diff --git a/core/modules/book/tests/src/Kernel/Migrate/d6/MigrateBookConfigsTest.php b/core/modules/book/tests/src/Kernel/Migrate/d6/MigrateBookConfigsTest.php
index a372e3a..41abb90 100644
--- a/core/modules/book/tests/src/Kernel/Migrate/d6/MigrateBookConfigsTest.php
+++ b/core/modules/book/tests/src/Kernel/Migrate/d6/MigrateBookConfigsTest.php
@@ -17,7 +17,7 @@ class MigrateBookConfigsTest extends MigrateDrupal6TestBase {
   /**
    * {@inheritdoc}
    */
-  public static $modules = ['book'];
+  protected static $modules = ['book'];
 
   /**
    * {@inheritdoc}
diff --git a/core/modules/book/tests/src/Kernel/Migrate/d6/MigrateBookTest.php b/core/modules/book/tests/src/Kernel/Migrate/d6/MigrateBookTest.php
index ffcc3fe..993254f 100644
--- a/core/modules/book/tests/src/Kernel/Migrate/d6/MigrateBookTest.php
+++ b/core/modules/book/tests/src/Kernel/Migrate/d6/MigrateBookTest.php
@@ -15,7 +15,7 @@ class MigrateBookTest extends MigrateDrupal6TestBase {
   /**
    * {@inheritdoc}
    */
-  public static $modules = ['book'];
+  protected static $modules = ['book'];
 
   /**
    * {@inheritdoc}
diff --git a/core/modules/book/tests/src/Kernel/Plugin/migrate/source/d6/BookTest.php b/core/modules/book/tests/src/Kernel/Plugin/migrate/source/d6/BookTest.php
index feece1f..407ef15 100644
--- a/core/modules/book/tests/src/Kernel/Plugin/migrate/source/d6/BookTest.php
+++ b/core/modules/book/tests/src/Kernel/Plugin/migrate/source/d6/BookTest.php
@@ -13,7 +13,7 @@ class BookTest extends MigrateSqlSourceTestBase {
   /**
    * {@inheritdoc}
    */
-  public static $modules = ['book', 'migrate_drupal'];
+  protected static $modules = ['book', 'migrate_drupal'];
 
   /**
    * {@inheritdoc}
diff --git a/core/modules/breakpoint/tests/src/Kernel/BreakpointDiscoveryTest.php b/core/modules/breakpoint/tests/src/Kernel/BreakpointDiscoveryTest.php
index 7683ea1..7b93a7f 100644
--- a/core/modules/breakpoint/tests/src/Kernel/BreakpointDiscoveryTest.php
+++ b/core/modules/breakpoint/tests/src/Kernel/BreakpointDiscoveryTest.php
@@ -16,7 +16,7 @@ class BreakpointDiscoveryTest extends KernelTestBase {
    *
    * @var array
    */
-  public static $modules = array('system', 'breakpoint', 'breakpoint_module_test');
+  protected static $modules = array('system', 'breakpoint', 'breakpoint_module_test');
 
   protected function setUp() {
     parent::setUp();
diff --git a/core/modules/ckeditor/tests/modules/src/Kernel/CKEditorPluginManagerTest.php b/core/modules/ckeditor/tests/modules/src/Kernel/CKEditorPluginManagerTest.php
index 92c448b..2bccd69 100644
--- a/core/modules/ckeditor/tests/modules/src/Kernel/CKEditorPluginManagerTest.php
+++ b/core/modules/ckeditor/tests/modules/src/Kernel/CKEditorPluginManagerTest.php
@@ -18,7 +18,7 @@ class CKEditorPluginManagerTest extends KernelTestBase {
    *
    * @var array
    */
-  public static $modules = array('system', 'user', 'filter', 'editor', 'ckeditor');
+  protected static $modules = array('system', 'user', 'filter', 'editor', 'ckeditor');
 
   /**
    * The manager for "CKEditor plugin" plugins.
diff --git a/core/modules/ckeditor/tests/modules/src/Kernel/CKEditorTest.php b/core/modules/ckeditor/tests/modules/src/Kernel/CKEditorTest.php
index 3711a54..89a5a9d 100644
--- a/core/modules/ckeditor/tests/modules/src/Kernel/CKEditorTest.php
+++ b/core/modules/ckeditor/tests/modules/src/Kernel/CKEditorTest.php
@@ -19,7 +19,7 @@ class CKEditorTest extends KernelTestBase {
    *
    * @var array
    */
-  public static $modules = array('system', 'user', 'filter', 'editor', 'ckeditor', 'filter_test');
+  protected static $modules = array('system', 'user', 'filter', 'editor', 'ckeditor', 'filter_test');
 
   /**
    * An instance of the "CKEditor" text editor plugin.
diff --git a/core/modules/ckeditor/tests/src/Kernel/Plugin/CKEditorPlugin/InternalTest.php b/core/modules/ckeditor/tests/src/Kernel/Plugin/CKEditorPlugin/InternalTest.php
index aecc228..afd916b 100644
--- a/core/modules/ckeditor/tests/src/Kernel/Plugin/CKEditorPlugin/InternalTest.php
+++ b/core/modules/ckeditor/tests/src/Kernel/Plugin/CKEditorPlugin/InternalTest.php
@@ -18,7 +18,7 @@ class InternalTest extends KernelTestBase {
    *
    * @var array
    */
-  public static $modules = [
+  protected static $modules = [
     'ckeditor',
     'ckeditor_test',
     'filter',
diff --git a/core/modules/color/tests/src/Functional/ColorConfigSchemaTest.php b/core/modules/color/tests/src/Functional/ColorConfigSchemaTest.php
index 157deb8..1ba689c 100644
--- a/core/modules/color/tests/src/Functional/ColorConfigSchemaTest.php
+++ b/core/modules/color/tests/src/Functional/ColorConfigSchemaTest.php
@@ -16,7 +16,7 @@ class ColorConfigSchemaTest extends BrowserTestBase {
    *
    * @var array
    */
-  public static $modules = array('color');
+  protected static $modules = array('color');
 
   /**
    * A user with administrative permissions.
diff --git a/core/modules/color/tests/src/Functional/ColorSafePreviewTest.php b/core/modules/color/tests/src/Functional/ColorSafePreviewTest.php
index e80202f..3f624a5 100644
--- a/core/modules/color/tests/src/Functional/ColorSafePreviewTest.php
+++ b/core/modules/color/tests/src/Functional/ColorSafePreviewTest.php
@@ -17,7 +17,7 @@ class ColorSafePreviewTest extends BrowserTestBase {
    *
    * @var string[]
    */
-  public static $modules = ['color', 'color_test'];
+  protected static $modules = ['color', 'color_test'];
 
   /**
    * A user with administrative permissions.
diff --git a/core/modules/color/tests/src/Functional/ColorTest.php b/core/modules/color/tests/src/Functional/ColorTest.php
index dc44566..3d1006d 100644
--- a/core/modules/color/tests/src/Functional/ColorTest.php
+++ b/core/modules/color/tests/src/Functional/ColorTest.php
@@ -17,7 +17,7 @@ class ColorTest extends BrowserTestBase {
    *
    * @var array
    */
-  public static $modules = array('color', 'color_test', 'block', 'file');
+  protected static $modules = array('color', 'color_test', 'block', 'file');
 
   /**
    * A user with administrative permissions.
diff --git a/core/modules/comment/tests/src/Functional/CommentStatusFieldAccessTest.php b/core/modules/comment/tests/src/Functional/CommentStatusFieldAccessTest.php
index 504b3ba..d10326e 100644
--- a/core/modules/comment/tests/src/Functional/CommentStatusFieldAccessTest.php
+++ b/core/modules/comment/tests/src/Functional/CommentStatusFieldAccessTest.php
@@ -38,7 +38,7 @@ class CommentStatusFieldAccessTest extends BrowserTestBase {
   /**
    * {@inheritdoc}
    */
-  public static $modules = [
+  protected static $modules = [
     'node',
     'comment',
     'user',
diff --git a/core/modules/comment/tests/src/Kernel/CommentDefaultFormatterCacheTagsTest.php b/core/modules/comment/tests/src/Kernel/CommentDefaultFormatterCacheTagsTest.php
index a95088e..4a7c458 100644
--- a/core/modules/comment/tests/src/Kernel/CommentDefaultFormatterCacheTagsTest.php
+++ b/core/modules/comment/tests/src/Kernel/CommentDefaultFormatterCacheTagsTest.php
@@ -26,7 +26,7 @@ class CommentDefaultFormatterCacheTagsTest extends EntityKernelTestBase {
    *
    * @var array
    */
-  public static $modules = array('entity_test', 'comment');
+  protected static $modules = array('entity_test', 'comment');
 
   /**
    * {@inheritdoc}
diff --git a/core/modules/comment/tests/src/Kernel/CommentFieldAccessTest.php b/core/modules/comment/tests/src/Kernel/CommentFieldAccessTest.php
index 674c7f3..86ced9f 100644
--- a/core/modules/comment/tests/src/Kernel/CommentFieldAccessTest.php
+++ b/core/modules/comment/tests/src/Kernel/CommentFieldAccessTest.php
@@ -29,7 +29,7 @@ class CommentFieldAccessTest extends EntityKernelTestBase {
    *
    * @var array
    */
-  public static $modules = array('comment', 'entity_test', 'user');
+  protected static $modules = array('comment', 'entity_test', 'user');
 
   /**
    * Fields that only users with administer comments permissions can change.
diff --git a/core/modules/comment/tests/src/Kernel/CommentIntegrationTest.php b/core/modules/comment/tests/src/Kernel/CommentIntegrationTest.php
index af73034..c327d54 100644
--- a/core/modules/comment/tests/src/Kernel/CommentIntegrationTest.php
+++ b/core/modules/comment/tests/src/Kernel/CommentIntegrationTest.php
@@ -21,7 +21,7 @@ class CommentIntegrationTest extends KernelTestBase {
   /**
    * {@inheritdoc}
    */
-  public static $modules = ['comment', 'field', 'entity_test', 'user', 'system', 'dblog'];
+  protected static $modules = ['comment', 'field', 'entity_test', 'user', 'system', 'dblog'];
 
   /**
    * {@inheritdoc}
diff --git a/core/modules/comment/tests/src/Kernel/CommentItemTest.php b/core/modules/comment/tests/src/Kernel/CommentItemTest.php
index 7b9a263..9b8bacd 100644
--- a/core/modules/comment/tests/src/Kernel/CommentItemTest.php
+++ b/core/modules/comment/tests/src/Kernel/CommentItemTest.php
@@ -22,7 +22,7 @@ class CommentItemTest extends FieldKernelTestBase {
    *
    * @var array
    */
-  public static $modules = ['comment', 'entity_test', 'user'];
+  protected static $modules = ['comment', 'entity_test', 'user'];
 
   protected function setUp() {
     parent::setUp();
diff --git a/core/modules/comment/tests/src/Kernel/CommentStringIdEntitiesTest.php b/core/modules/comment/tests/src/Kernel/CommentStringIdEntitiesTest.php
index ed56cc9..3880ff3 100644
--- a/core/modules/comment/tests/src/Kernel/CommentStringIdEntitiesTest.php
+++ b/core/modules/comment/tests/src/Kernel/CommentStringIdEntitiesTest.php
@@ -18,7 +18,7 @@ class CommentStringIdEntitiesTest extends KernelTestBase {
    *
    * @var array
    */
-  public static $modules = array(
+  protected static $modules = array(
     'comment',
     'user',
     'field',
diff --git a/core/modules/comment/tests/src/Kernel/CommentValidationTest.php b/core/modules/comment/tests/src/Kernel/CommentValidationTest.php
index eb37006..ab879cb 100644
--- a/core/modules/comment/tests/src/Kernel/CommentValidationTest.php
+++ b/core/modules/comment/tests/src/Kernel/CommentValidationTest.php
@@ -19,7 +19,7 @@ class CommentValidationTest extends EntityKernelTestBase {
    *
    * @var array
    */
-  public static $modules = array('comment', 'node');
+  protected static $modules = array('comment', 'node');
 
   /**
    * {@inheritdoc}
diff --git a/core/modules/comment/tests/src/Kernel/Migrate/MigrateCommentStubTest.php b/core/modules/comment/tests/src/Kernel/Migrate/MigrateCommentStubTest.php
index b5fc4fe..fe03b69 100644
--- a/core/modules/comment/tests/src/Kernel/Migrate/MigrateCommentStubTest.php
+++ b/core/modules/comment/tests/src/Kernel/Migrate/MigrateCommentStubTest.php
@@ -20,7 +20,7 @@ class MigrateCommentStubTest extends MigrateDrupalTestBase {
   /**
    * {@inheritdoc}
    */
-  public static $modules = ['comment', 'node'];
+  protected static $modules = ['comment', 'node'];
 
   /**
    * {@inheritdoc}
diff --git a/core/modules/comment/tests/src/Kernel/Migrate/d6/MigrateCommentTest.php b/core/modules/comment/tests/src/Kernel/Migrate/d6/MigrateCommentTest.php
index 5330e94..557e7ac 100644
--- a/core/modules/comment/tests/src/Kernel/Migrate/d6/MigrateCommentTest.php
+++ b/core/modules/comment/tests/src/Kernel/Migrate/d6/MigrateCommentTest.php
@@ -17,7 +17,7 @@ class MigrateCommentTest extends MigrateDrupal6TestBase {
   /**
    * {@inheritdoc}
    */
-  public static $modules = ['comment'];
+  protected static $modules = ['comment'];
 
   /**
    * {@inheritdoc}
diff --git a/core/modules/comment/tests/src/Kernel/Migrate/d6/MigrateCommentTypeTest.php b/core/modules/comment/tests/src/Kernel/Migrate/d6/MigrateCommentTypeTest.php
index c28be63..21c4822 100644
--- a/core/modules/comment/tests/src/Kernel/Migrate/d6/MigrateCommentTypeTest.php
+++ b/core/modules/comment/tests/src/Kernel/Migrate/d6/MigrateCommentTypeTest.php
@@ -15,7 +15,7 @@ class MigrateCommentTypeTest extends MigrateDrupal6TestBase {
   /**
    * {@inheritdoc}
    */
-  public static $modules = ['comment'];
+  protected static $modules = ['comment'];
 
   /**
    * {@inheritdoc}
diff --git a/core/modules/comment/tests/src/Kernel/Migrate/d6/MigrateCommentVariableDisplayBase.php b/core/modules/comment/tests/src/Kernel/Migrate/d6/MigrateCommentVariableDisplayBase.php
index 964185b..e19af8f 100644
--- a/core/modules/comment/tests/src/Kernel/Migrate/d6/MigrateCommentVariableDisplayBase.php
+++ b/core/modules/comment/tests/src/Kernel/Migrate/d6/MigrateCommentVariableDisplayBase.php
@@ -12,7 +12,7 @@
   /**
    * {@inheritdoc}
    */
-  public static $modules = ['comment'];
+  protected static $modules = ['comment'];
 
   /**
    * {@inheritdoc}
diff --git a/core/modules/comment/tests/src/Kernel/Migrate/d6/MigrateCommentVariableEntityFormDisplaySubjectTest.php b/core/modules/comment/tests/src/Kernel/Migrate/d6/MigrateCommentVariableEntityFormDisplaySubjectTest.php
index 31e61e0..389be52 100644
--- a/core/modules/comment/tests/src/Kernel/Migrate/d6/MigrateCommentVariableEntityFormDisplaySubjectTest.php
+++ b/core/modules/comment/tests/src/Kernel/Migrate/d6/MigrateCommentVariableEntityFormDisplaySubjectTest.php
@@ -15,7 +15,7 @@ class MigrateCommentVariableEntityFormDisplaySubjectTest extends MigrateDrupal6T
   /**
    * {@inheritdoc}
    */
-  public static $modules = ['comment'];
+  protected static $modules = ['comment'];
 
   /**
    * {@inheritdoc}
diff --git a/core/modules/comment/tests/src/Kernel/Migrate/d6/MigrateCommentVariableFieldTest.php b/core/modules/comment/tests/src/Kernel/Migrate/d6/MigrateCommentVariableFieldTest.php
index b63d1a1..ded0146 100644
--- a/core/modules/comment/tests/src/Kernel/Migrate/d6/MigrateCommentVariableFieldTest.php
+++ b/core/modules/comment/tests/src/Kernel/Migrate/d6/MigrateCommentVariableFieldTest.php
@@ -15,7 +15,7 @@ class MigrateCommentVariableFieldTest extends MigrateDrupal6TestBase {
   /**
    * {@inheritdoc}
    */
-  public static $modules = ['comment'];
+  protected static $modules = ['comment'];
 
   /**
    * {@inheritdoc}
diff --git a/core/modules/comment/tests/src/Kernel/Migrate/d6/MigrateCommentVariableInstanceTest.php b/core/modules/comment/tests/src/Kernel/Migrate/d6/MigrateCommentVariableInstanceTest.php
index 280cad2..080f174 100644
--- a/core/modules/comment/tests/src/Kernel/Migrate/d6/MigrateCommentVariableInstanceTest.php
+++ b/core/modules/comment/tests/src/Kernel/Migrate/d6/MigrateCommentVariableInstanceTest.php
@@ -16,7 +16,7 @@ class MigrateCommentVariableInstanceTest extends MigrateDrupal6TestBase {
   /**
    * {@inheritdoc}
    */
-  public static $modules = ['comment'];
+  protected static $modules = ['comment'];
 
   /**
    * {@inheritdoc}
diff --git a/core/modules/comment/tests/src/Kernel/Migrate/d7/MigrateCommentEntityDisplayTest.php b/core/modules/comment/tests/src/Kernel/Migrate/d7/MigrateCommentEntityDisplayTest.php
index e1edd3c..d13599e 100644
--- a/core/modules/comment/tests/src/Kernel/Migrate/d7/MigrateCommentEntityDisplayTest.php
+++ b/core/modules/comment/tests/src/Kernel/Migrate/d7/MigrateCommentEntityDisplayTest.php
@@ -12,7 +12,7 @@
  */
 class MigrateCommentEntityDisplayTest extends MigrateDrupal7TestBase {
 
-  public static $modules = ['node', 'comment', 'text'];
+  protected static $modules = ['node', 'comment', 'text'];
 
   /**
    * {@inheritdoc}
diff --git a/core/modules/comment/tests/src/Kernel/Migrate/d7/MigrateCommentEntityFormDisplaySubjectTest.php b/core/modules/comment/tests/src/Kernel/Migrate/d7/MigrateCommentEntityFormDisplaySubjectTest.php
index f8c4a07..f1d4a42 100644
--- a/core/modules/comment/tests/src/Kernel/Migrate/d7/MigrateCommentEntityFormDisplaySubjectTest.php
+++ b/core/modules/comment/tests/src/Kernel/Migrate/d7/MigrateCommentEntityFormDisplaySubjectTest.php
@@ -12,7 +12,7 @@
  */
 class MigrateCommentEntityFormDisplaySubjectTest extends MigrateDrupal7TestBase {
 
-  public static $modules = ['node', 'comment', 'text'];
+  protected static $modules = ['node', 'comment', 'text'];
 
   /**
    * {@inheritdoc}
diff --git a/core/modules/comment/tests/src/Kernel/Migrate/d7/MigrateCommentEntityFormDisplayTest.php b/core/modules/comment/tests/src/Kernel/Migrate/d7/MigrateCommentEntityFormDisplayTest.php
index 1332a67..113fa1f 100644
--- a/core/modules/comment/tests/src/Kernel/Migrate/d7/MigrateCommentEntityFormDisplayTest.php
+++ b/core/modules/comment/tests/src/Kernel/Migrate/d7/MigrateCommentEntityFormDisplayTest.php
@@ -12,7 +12,7 @@
  */
 class MigrateCommentEntityFormDisplayTest extends MigrateDrupal7TestBase {
 
-  public static $modules = ['node', 'comment', 'text'];
+  protected static $modules = ['node', 'comment', 'text'];
 
   /**
    * {@inheritdoc}
diff --git a/core/modules/comment/tests/src/Kernel/Migrate/d7/MigrateCommentFieldInstanceTest.php b/core/modules/comment/tests/src/Kernel/Migrate/d7/MigrateCommentFieldInstanceTest.php
index c7d8959..7a12291 100644
--- a/core/modules/comment/tests/src/Kernel/Migrate/d7/MigrateCommentFieldInstanceTest.php
+++ b/core/modules/comment/tests/src/Kernel/Migrate/d7/MigrateCommentFieldInstanceTest.php
@@ -15,7 +15,7 @@
  */
 class MigrateCommentFieldInstanceTest extends MigrateDrupal7TestBase {
 
-  public static $modules = ['node', 'comment', 'text'];
+  protected static $modules = ['node', 'comment', 'text'];
 
   /**
    * {@inheritdoc}
diff --git a/core/modules/comment/tests/src/Kernel/Migrate/d7/MigrateCommentFieldTest.php b/core/modules/comment/tests/src/Kernel/Migrate/d7/MigrateCommentFieldTest.php
index e6f8e28..f57b08e 100644
--- a/core/modules/comment/tests/src/Kernel/Migrate/d7/MigrateCommentFieldTest.php
+++ b/core/modules/comment/tests/src/Kernel/Migrate/d7/MigrateCommentFieldTest.php
@@ -14,7 +14,7 @@
  */
 class MigrateCommentFieldTest extends MigrateDrupal7TestBase {
 
-  public static $modules = ['node', 'comment', 'text'];
+  protected static $modules = ['node', 'comment', 'text'];
 
   /**
    * {@inheritdoc}
diff --git a/core/modules/comment/tests/src/Kernel/Migrate/d7/MigrateCommentTest.php b/core/modules/comment/tests/src/Kernel/Migrate/d7/MigrateCommentTest.php
index 4d4df03..4577c12 100644
--- a/core/modules/comment/tests/src/Kernel/Migrate/d7/MigrateCommentTest.php
+++ b/core/modules/comment/tests/src/Kernel/Migrate/d7/MigrateCommentTest.php
@@ -14,7 +14,7 @@
  */
 class MigrateCommentTest extends MigrateDrupal7TestBase {
 
-  public static $modules = ['filter', 'node', 'comment', 'text'];
+  protected static $modules = ['filter', 'node', 'comment', 'text'];
 
   /**
    * {@inheritdoc}
diff --git a/core/modules/comment/tests/src/Kernel/Migrate/d7/MigrateCommentTypeTest.php b/core/modules/comment/tests/src/Kernel/Migrate/d7/MigrateCommentTypeTest.php
index 3f8fe4c..6ee89aa 100644
--- a/core/modules/comment/tests/src/Kernel/Migrate/d7/MigrateCommentTypeTest.php
+++ b/core/modules/comment/tests/src/Kernel/Migrate/d7/MigrateCommentTypeTest.php
@@ -13,7 +13,7 @@
  */
 class MigrateCommentTypeTest extends MigrateDrupal7TestBase {
 
-  public static $modules = ['node', 'comment', 'text'];
+  protected static $modules = ['node', 'comment', 'text'];
 
   /**
    * {@inheritdoc}
diff --git a/core/modules/comment/tests/src/Kernel/Views/CommentUserNameTest.php b/core/modules/comment/tests/src/Kernel/Views/CommentUserNameTest.php
index dae2c48..28324f5 100644
--- a/core/modules/comment/tests/src/Kernel/Views/CommentUserNameTest.php
+++ b/core/modules/comment/tests/src/Kernel/Views/CommentUserNameTest.php
@@ -26,7 +26,7 @@ class CommentUserNameTest extends ViewsKernelTestBase {
   /**
    * {@inheritdoc}
    */
-  public static $modules = ['user', 'comment', 'entity_test'];
+  protected static $modules = ['user', 'comment', 'entity_test'];
 
   /**
    * {@inheritdoc}
diff --git a/core/modules/comment/tests/src/Kernel/Views/CommentViewsFieldAccessTest.php b/core/modules/comment/tests/src/Kernel/Views/CommentViewsFieldAccessTest.php
index f807c58..bc2a479 100644
--- a/core/modules/comment/tests/src/Kernel/Views/CommentViewsFieldAccessTest.php
+++ b/core/modules/comment/tests/src/Kernel/Views/CommentViewsFieldAccessTest.php
@@ -16,7 +16,7 @@ class CommentViewsFieldAccessTest extends FieldFieldAccessTestBase {
   /**
    * {@inheritdoc}
    */
-  public static $modules = ['comment', 'entity_test'];
+  protected static $modules = ['comment', 'entity_test'];
 
   /**
    * {@inheritdoc}
diff --git a/core/modules/comment/tests/src/Kernel/Views/CommentViewsKernelTestBase.php b/core/modules/comment/tests/src/Kernel/Views/CommentViewsKernelTestBase.php
index 5167503..e112b8a 100644
--- a/core/modules/comment/tests/src/Kernel/Views/CommentViewsKernelTestBase.php
+++ b/core/modules/comment/tests/src/Kernel/Views/CommentViewsKernelTestBase.php
@@ -16,7 +16,7 @@
    *
    * @var array
    */
-  public static $modules = ['comment_test_views', 'user', 'comment'];
+  protected static $modules = ['comment_test_views', 'user', 'comment'];
 
   /**
    * Admin user.
diff --git a/core/modules/config_translation/tests/src/Kernel/Migrate/d6/MigrateI18nSystemMaintenanceTest.php b/core/modules/config_translation/tests/src/Kernel/Migrate/d6/MigrateI18nSystemMaintenanceTest.php
index d1c5867..7089936 100644
--- a/core/modules/config_translation/tests/src/Kernel/Migrate/d6/MigrateI18nSystemMaintenanceTest.php
+++ b/core/modules/config_translation/tests/src/Kernel/Migrate/d6/MigrateI18nSystemMaintenanceTest.php
@@ -11,7 +11,7 @@
  */
 class MigrateI18nSystemMaintenanceTest extends MigrateDrupal6TestBase {
 
-  public static $modules = ['language', 'config_translation'];
+  protected static $modules = ['language', 'config_translation'];
 
   /**
    * {@inheritdoc}
diff --git a/core/modules/config_translation/tests/src/Kernel/Migrate/d6/MigrateI18nSystemSiteTest.php b/core/modules/config_translation/tests/src/Kernel/Migrate/d6/MigrateI18nSystemSiteTest.php
index 770b33c..9b76eca 100644
--- a/core/modules/config_translation/tests/src/Kernel/Migrate/d6/MigrateI18nSystemSiteTest.php
+++ b/core/modules/config_translation/tests/src/Kernel/Migrate/d6/MigrateI18nSystemSiteTest.php
@@ -11,7 +11,7 @@
  */
 class MigrateI18nSystemSiteTest extends MigrateDrupal6TestBase {
 
-  public static $modules = ['language', 'config_translation'];
+  protected static $modules = ['language', 'config_translation'];
 
   /**
    * {@inheritdoc}
diff --git a/core/modules/config_translation/tests/src/Kernel/Migrate/d6/MigrateI18nUserConfigsTest.php b/core/modules/config_translation/tests/src/Kernel/Migrate/d6/MigrateI18nUserConfigsTest.php
index b36a547..835aa2f 100644
--- a/core/modules/config_translation/tests/src/Kernel/Migrate/d6/MigrateI18nUserConfigsTest.php
+++ b/core/modules/config_translation/tests/src/Kernel/Migrate/d6/MigrateI18nUserConfigsTest.php
@@ -14,7 +14,7 @@ class MigrateI18nUserConfigsTest extends MigrateDrupal6TestBase {
 
   use SchemaCheckTestTrait;
 
-  public static $modules = ['language', 'locale', 'config_translation'];
+  protected static $modules = ['language', 'locale', 'config_translation'];
 
   /**
    * {@inheritdoc}
diff --git a/core/modules/contact/tests/src/Kernel/MessageEntityTest.php b/core/modules/contact/tests/src/Kernel/MessageEntityTest.php
index 70ddea1..cba06c1 100644
--- a/core/modules/contact/tests/src/Kernel/MessageEntityTest.php
+++ b/core/modules/contact/tests/src/Kernel/MessageEntityTest.php
@@ -17,7 +17,7 @@ class MessageEntityTest extends EntityKernelTestBase {
    *
    * @var array
    */
-  public static $modules = array(
+  protected static $modules = array(
     'system',
     'contact',
     'field',
diff --git a/core/modules/contact/tests/src/Kernel/Migrate/MigrateContactCategoryTest.php b/core/modules/contact/tests/src/Kernel/Migrate/MigrateContactCategoryTest.php
index 291826c..ecf16d9 100644
--- a/core/modules/contact/tests/src/Kernel/Migrate/MigrateContactCategoryTest.php
+++ b/core/modules/contact/tests/src/Kernel/Migrate/MigrateContactCategoryTest.php
@@ -18,7 +18,7 @@ class MigrateContactCategoryTest extends MigrateDrupal6TestBase {
    *
    * @var array
    */
-  public static $modules = array('contact');
+  protected static $modules = array('contact');
 
   /**
    * {@inheritdoc}
diff --git a/core/modules/contact/tests/src/Kernel/Migrate/d6/MigrateContactCategoryTest.php b/core/modules/contact/tests/src/Kernel/Migrate/d6/MigrateContactCategoryTest.php
index e40f0bd..a58c070 100644
--- a/core/modules/contact/tests/src/Kernel/Migrate/d6/MigrateContactCategoryTest.php
+++ b/core/modules/contact/tests/src/Kernel/Migrate/d6/MigrateContactCategoryTest.php
@@ -15,7 +15,7 @@ class MigrateContactCategoryTest extends MigrateDrupal6TestBase {
   /**
    * {@inheritdoc}
    */
-  public static $modules = ['contact'];
+  protected static $modules = ['contact'];
 
   /**
    * {@inheritdoc}
diff --git a/core/modules/contact/tests/src/Kernel/Migrate/d6/MigrateContactSettingsTest.php b/core/modules/contact/tests/src/Kernel/Migrate/d6/MigrateContactSettingsTest.php
index 9efaae9..a5de7f0 100644
--- a/core/modules/contact/tests/src/Kernel/Migrate/d6/MigrateContactSettingsTest.php
+++ b/core/modules/contact/tests/src/Kernel/Migrate/d6/MigrateContactSettingsTest.php
@@ -17,7 +17,7 @@ class MigrateContactSettingsTest extends MigrateDrupal6TestBase {
   /**
    * {@inheritdoc}
    */
-  public static $modules = ['contact'];
+  protected static $modules = ['contact'];
 
   /**
    * {@inheritdoc}
diff --git a/core/modules/contact/tests/src/Kernel/Migrate/d7/MigrateContactSettingsTest.php b/core/modules/contact/tests/src/Kernel/Migrate/d7/MigrateContactSettingsTest.php
index 22385f0..b94cdf0 100644
--- a/core/modules/contact/tests/src/Kernel/Migrate/d7/MigrateContactSettingsTest.php
+++ b/core/modules/contact/tests/src/Kernel/Migrate/d7/MigrateContactSettingsTest.php
@@ -14,7 +14,7 @@ class MigrateContactSettingsTest extends MigrateDrupal7TestBase {
   /**
    * {@inheritdoc}
    */
-  public static $modules = ['contact'];
+  protected static $modules = ['contact'];
 
   /**
    * {@inheritdoc}
diff --git a/core/modules/contact/tests/src/Kernel/Plugin/migrate/source/ContactCategoryTest.php b/core/modules/contact/tests/src/Kernel/Plugin/migrate/source/ContactCategoryTest.php
index 619e0cd..1ea9b33 100644
--- a/core/modules/contact/tests/src/Kernel/Plugin/migrate/source/ContactCategoryTest.php
+++ b/core/modules/contact/tests/src/Kernel/Plugin/migrate/source/ContactCategoryTest.php
@@ -15,7 +15,7 @@ class ContactCategoryTest extends MigrateSqlSourceTestBase {
   /**
    * {@inheritdoc}
    */
-  public static $modules = ['contact', 'migrate_drupal', 'user'];
+  protected static $modules = ['contact', 'migrate_drupal', 'user'];
 
   /**
    * {@inheritdoc}
diff --git a/core/modules/contact/tests/src/Kernel/Plugin/migrate/source/d6/ContactSettingsTest.php b/core/modules/contact/tests/src/Kernel/Plugin/migrate/source/d6/ContactSettingsTest.php
index 72ea7f2..5abac5a 100644
--- a/core/modules/contact/tests/src/Kernel/Plugin/migrate/source/d6/ContactSettingsTest.php
+++ b/core/modules/contact/tests/src/Kernel/Plugin/migrate/source/d6/ContactSettingsTest.php
@@ -15,7 +15,7 @@ class ContactSettingsTest extends MigrateSqlSourceTestBase {
   /**
    * {@inheritdoc}
    */
-  public static $modules = ['contact', 'migrate_drupal', 'user'];
+  protected static $modules = ['contact', 'migrate_drupal', 'user'];
 
   /**
    * {@inheritdoc}
diff --git a/core/modules/content_moderation/tests/src/Functional/LatestRevisionViewsFilterTest.php b/core/modules/content_moderation/tests/src/Functional/LatestRevisionViewsFilterTest.php
index 77ae046..0de012d 100644
--- a/core/modules/content_moderation/tests/src/Functional/LatestRevisionViewsFilterTest.php
+++ b/core/modules/content_moderation/tests/src/Functional/LatestRevisionViewsFilterTest.php
@@ -16,7 +16,7 @@ class LatestRevisionViewsFilterTest extends BrowserTestBase {
   /**
    * {@inheritdoc}
    */
-  public static $modules = [
+  protected static $modules = [
     'content_moderation_test_views',
     'content_moderation',
   ];
diff --git a/core/modules/content_moderation/tests/src/Functional/ModerationStateAccessTest.php b/core/modules/content_moderation/tests/src/Functional/ModerationStateAccessTest.php
index 799d89a..ca19f13 100644
--- a/core/modules/content_moderation/tests/src/Functional/ModerationStateAccessTest.php
+++ b/core/modules/content_moderation/tests/src/Functional/ModerationStateAccessTest.php
@@ -16,7 +16,7 @@ class ModerationStateAccessTest extends BrowserTestBase {
   /**
    * {@inheritdoc}
    */
-  public static $modules = [
+  protected static $modules = [
     'content_moderation_test_views',
     'content_moderation',
   ];
diff --git a/core/modules/content_moderation/tests/src/Kernel/ContentModerationSchemaTest.php b/core/modules/content_moderation/tests/src/Kernel/ContentModerationSchemaTest.php
index 8b382c1..a6a7bfa 100644
--- a/core/modules/content_moderation/tests/src/Kernel/ContentModerationSchemaTest.php
+++ b/core/modules/content_moderation/tests/src/Kernel/ContentModerationSchemaTest.php
@@ -21,7 +21,7 @@ class ContentModerationSchemaTest extends KernelTestBase {
   /**
    * {@inheritdoc}
    */
-  public static $modules = [
+  protected static $modules = [
     'content_moderation',
     'node',
     'user',
diff --git a/core/modules/content_moderation/tests/src/Kernel/ContentModerationStateTest.php b/core/modules/content_moderation/tests/src/Kernel/ContentModerationStateTest.php
index 3ba37a2..4e49eea 100644
--- a/core/modules/content_moderation/tests/src/Kernel/ContentModerationStateTest.php
+++ b/core/modules/content_moderation/tests/src/Kernel/ContentModerationStateTest.php
@@ -20,7 +20,7 @@ class ContentModerationStateTest extends KernelTestBase {
   /**
    * {@inheritdoc}
    */
-  public static $modules = [
+  protected static $modules = [
     'node',
     'content_moderation',
     'user',
diff --git a/core/modules/content_moderation/tests/src/Kernel/EntityOperationsTest.php b/core/modules/content_moderation/tests/src/Kernel/EntityOperationsTest.php
index 929356e..9fdec11 100644
--- a/core/modules/content_moderation/tests/src/Kernel/EntityOperationsTest.php
+++ b/core/modules/content_moderation/tests/src/Kernel/EntityOperationsTest.php
@@ -18,7 +18,7 @@ class EntityOperationsTest extends KernelTestBase {
   /**
    * {@inheritdoc}
    */
-  public static $modules = [
+  protected static $modules = [
     'content_moderation',
     'node',
     'user',
diff --git a/core/modules/content_moderation/tests/src/Kernel/EntityRevisionConverterTest.php b/core/modules/content_moderation/tests/src/Kernel/EntityRevisionConverterTest.php
index 89c84f9..5db07df 100644
--- a/core/modules/content_moderation/tests/src/Kernel/EntityRevisionConverterTest.php
+++ b/core/modules/content_moderation/tests/src/Kernel/EntityRevisionConverterTest.php
@@ -13,7 +13,7 @@
  */
 class EntityRevisionConverterTest extends KernelTestBase {
 
-  public static $modules = [
+  protected static $modules = [
     'user',
     'entity_test',
     'system',
diff --git a/core/modules/content_moderation/tests/src/Kernel/EntityStateChangeValidationTest.php b/core/modules/content_moderation/tests/src/Kernel/EntityStateChangeValidationTest.php
index 97e61f1..92d4a4f 100644
--- a/core/modules/content_moderation/tests/src/Kernel/EntityStateChangeValidationTest.php
+++ b/core/modules/content_moderation/tests/src/Kernel/EntityStateChangeValidationTest.php
@@ -16,7 +16,7 @@ class EntityStateChangeValidationTest extends KernelTestBase {
   /**
    * {@inheritdoc}
    */
-  public static $modules = [
+  protected static $modules = [
     'node',
     'content_moderation',
     'user',
diff --git a/core/modules/content_moderation/tests/src/Kernel/ModerationStateEntityTest.php b/core/modules/content_moderation/tests/src/Kernel/ModerationStateEntityTest.php
index f312cde..a325060 100644
--- a/core/modules/content_moderation/tests/src/Kernel/ModerationStateEntityTest.php
+++ b/core/modules/content_moderation/tests/src/Kernel/ModerationStateEntityTest.php
@@ -15,7 +15,7 @@ class ModerationStateEntityTest extends KernelTestBase {
   /**
    * {@inheritdoc}
    */
-  public static $modules = ['content_moderation'];
+  protected static $modules = ['content_moderation'];
 
   /**
    * {@inheritdoc}
diff --git a/core/modules/content_moderation/tests/src/Kernel/ModerationStateFieldItemListTest.php b/core/modules/content_moderation/tests/src/Kernel/ModerationStateFieldItemListTest.php
index c57963e..cf8016d 100644
--- a/core/modules/content_moderation/tests/src/Kernel/ModerationStateFieldItemListTest.php
+++ b/core/modules/content_moderation/tests/src/Kernel/ModerationStateFieldItemListTest.php
@@ -16,7 +16,7 @@ class ModerationStateFieldItemListTest extends KernelTestBase {
   /**
    * {@inheritdoc}
    */
-  public static $modules = [
+  protected static $modules = [
     'node',
     'content_moderation',
     'user',
diff --git a/core/modules/content_moderation/tests/src/Kernel/ViewsDataIntegrationTest.php b/core/modules/content_moderation/tests/src/Kernel/ViewsDataIntegrationTest.php
index c869619..386bfe9 100644
--- a/core/modules/content_moderation/tests/src/Kernel/ViewsDataIntegrationTest.php
+++ b/core/modules/content_moderation/tests/src/Kernel/ViewsDataIntegrationTest.php
@@ -17,7 +17,7 @@ class ViewsDataIntegrationTest extends ViewsKernelTestBase {
   /**
    * {@inheritdoc}
    */
-  public static $modules = [
+  protected static $modules = [
     'content_moderation_test_views',
     'node',
     'content_moderation',
diff --git a/core/modules/content_translation/tests/src/Kernel/ContentTranslationConfigImportTest.php b/core/modules/content_translation/tests/src/Kernel/ContentTranslationConfigImportTest.php
index f650270..db5153c 100644
--- a/core/modules/content_translation/tests/src/Kernel/ContentTranslationConfigImportTest.php
+++ b/core/modules/content_translation/tests/src/Kernel/ContentTranslationConfigImportTest.php
@@ -25,7 +25,7 @@ class ContentTranslationConfigImportTest extends KernelTestBase {
    *
    * @var array
    */
-  public static $modules = array('system', 'user', 'entity_test', 'language', 'content_translation');
+  protected static $modules = array('system', 'user', 'entity_test', 'language', 'content_translation');
 
   /**
    * {@inheritdoc}
diff --git a/core/modules/content_translation/tests/src/Kernel/ContentTranslationSettingsApiTest.php b/core/modules/content_translation/tests/src/Kernel/ContentTranslationSettingsApiTest.php
index 291cdf9..258f731 100644
--- a/core/modules/content_translation/tests/src/Kernel/ContentTranslationSettingsApiTest.php
+++ b/core/modules/content_translation/tests/src/Kernel/ContentTranslationSettingsApiTest.php
@@ -16,7 +16,7 @@ class ContentTranslationSettingsApiTest extends KernelTestBase {
    *
    * @var array
    */
-  public static $modules = array('language', 'content_translation', 'user', 'entity_test');
+  protected static $modules = array('language', 'content_translation', 'user', 'entity_test');
 
   /**
    * {@inheritdoc}
diff --git a/core/modules/content_translation/tests/src/Kernel/ContentTranslationSyncUnitTest.php b/core/modules/content_translation/tests/src/Kernel/ContentTranslationSyncUnitTest.php
index eb52e50..40ec8a1 100644
--- a/core/modules/content_translation/tests/src/Kernel/ContentTranslationSyncUnitTest.php
+++ b/core/modules/content_translation/tests/src/Kernel/ContentTranslationSyncUnitTest.php
@@ -54,7 +54,7 @@ class ContentTranslationSyncUnitTest extends KernelTestBase {
    */
   protected $unchangedFieldValues;
 
-  public static $modules = array('language', 'content_translation');
+  protected static $modules = array('language', 'content_translation');
 
   protected function setUp() {
     parent::setUp();
diff --git a/core/modules/contextual/tests/src/Kernel/ContextualUnitTest.php b/core/modules/contextual/tests/src/Kernel/ContextualUnitTest.php
index 680303d..62ab5f3 100644
--- a/core/modules/contextual/tests/src/Kernel/ContextualUnitTest.php
+++ b/core/modules/contextual/tests/src/Kernel/ContextualUnitTest.php
@@ -17,7 +17,7 @@ class ContextualUnitTest extends KernelTestBase {
    *
    * @var array
    */
-  public static $modules = array('contextual');
+  protected static $modules = array('contextual');
 
   /**
    * Provides testcases for testContextualLinksToId() and
diff --git a/core/modules/datetime/tests/src/Kernel/DateTimeItemTest.php b/core/modules/datetime/tests/src/Kernel/DateTimeItemTest.php
index d26434b..995f140 100644
--- a/core/modules/datetime/tests/src/Kernel/DateTimeItemTest.php
+++ b/core/modules/datetime/tests/src/Kernel/DateTimeItemTest.php
@@ -21,7 +21,7 @@ class DateTimeItemTest extends FieldKernelTestBase {
    *
    * @var array
    */
-  public static $modules = array('datetime');
+  protected static $modules = array('datetime');
 
   protected function setUp() {
     parent::setUp();
diff --git a/core/modules/datetime_range/tests/src/Kernel/SeparatorTranslationTest.php b/core/modules/datetime_range/tests/src/Kernel/SeparatorTranslationTest.php
index 155bb61..f820194 100644
--- a/core/modules/datetime_range/tests/src/Kernel/SeparatorTranslationTest.php
+++ b/core/modules/datetime_range/tests/src/Kernel/SeparatorTranslationTest.php
@@ -36,7 +36,7 @@ class SeparatorTranslationTest extends KernelTestBase {
   /**
    * {@inheritdoc}
    */
-  public static $modules = [
+  protected static $modules = [
     'datetime',
     'datetime_range',
     'entity_test',
diff --git a/core/modules/dblog/tests/src/Kernel/DbLogControllerTest.php b/core/modules/dblog/tests/src/Kernel/DbLogControllerTest.php
index d6d88fa..02acb96 100644
--- a/core/modules/dblog/tests/src/Kernel/DbLogControllerTest.php
+++ b/core/modules/dblog/tests/src/Kernel/DbLogControllerTest.php
@@ -15,7 +15,7 @@ class DbLogControllerTest extends KernelTestBase {
   /**
    * {@inheritdoc}
    */
-  public static $modules = ['dblog', 'user'];
+  protected static $modules = ['dblog', 'user'];
 
   /**
    * Tests corrupted log entries can still display available data.
diff --git a/core/modules/dblog/tests/src/Kernel/DbLogFormInjectionTest.php b/core/modules/dblog/tests/src/Kernel/DbLogFormInjectionTest.php
index 569cdbf..299deae 100644
--- a/core/modules/dblog/tests/src/Kernel/DbLogFormInjectionTest.php
+++ b/core/modules/dblog/tests/src/Kernel/DbLogFormInjectionTest.php
@@ -31,7 +31,7 @@ class DbLogFormInjectionTest extends KernelTestBase implements FormInterface {
    *
    * @var array
    */
-  public static $modules = array('system', 'dblog', 'user');
+  protected static $modules = array('system', 'dblog', 'user');
 
   /**
    * {@inheritdoc}
diff --git a/core/modules/dblog/tests/src/Kernel/Migrate/d6/MigrateDblogConfigsTest.php b/core/modules/dblog/tests/src/Kernel/Migrate/d6/MigrateDblogConfigsTest.php
index 321870f..63d8ba5 100644
--- a/core/modules/dblog/tests/src/Kernel/Migrate/d6/MigrateDblogConfigsTest.php
+++ b/core/modules/dblog/tests/src/Kernel/Migrate/d6/MigrateDblogConfigsTest.php
@@ -17,7 +17,7 @@ class MigrateDblogConfigsTest extends MigrateDrupal6TestBase {
   /**
    * {@inheritdoc}
    */
-  public static $modules = ['dblog'];
+  protected static $modules = ['dblog'];
 
   /**
    * {@inheritdoc}
diff --git a/core/modules/dblog/tests/src/Kernel/Migrate/d7/MigrateDblogConfigsTest.php b/core/modules/dblog/tests/src/Kernel/Migrate/d7/MigrateDblogConfigsTest.php
index d970830..ba94f66 100644
--- a/core/modules/dblog/tests/src/Kernel/Migrate/d7/MigrateDblogConfigsTest.php
+++ b/core/modules/dblog/tests/src/Kernel/Migrate/d7/MigrateDblogConfigsTest.php
@@ -14,7 +14,7 @@ class MigrateDblogConfigsTest extends MigrateDrupal7TestBase {
   /**
    * {@inheritdoc}
    */
-  public static $modules = ['dblog'];
+  protected static $modules = ['dblog'];
 
   /**
    * {@inheritdoc}
diff --git a/core/modules/dblog/tests/src/Kernel/Views/ViewsIntegrationTest.php b/core/modules/dblog/tests/src/Kernel/Views/ViewsIntegrationTest.php
index 1968a12..91e76fa 100644
--- a/core/modules/dblog/tests/src/Kernel/Views/ViewsIntegrationTest.php
+++ b/core/modules/dblog/tests/src/Kernel/Views/ViewsIntegrationTest.php
@@ -29,7 +29,7 @@ class ViewsIntegrationTest extends ViewsKernelTestBase {
    *
    * @var array
    */
-  public static $modules = array('dblog', 'dblog_test_views', 'user');
+  protected static $modules = array('dblog', 'dblog_test_views', 'user');
 
   /**
    * {@inheritdoc}
diff --git a/core/modules/editor/tests/src/Kernel/EditorFileReferenceFilterTest.php b/core/modules/editor/tests/src/Kernel/EditorFileReferenceFilterTest.php
index 51eee97..2791d46 100644
--- a/core/modules/editor/tests/src/Kernel/EditorFileReferenceFilterTest.php
+++ b/core/modules/editor/tests/src/Kernel/EditorFileReferenceFilterTest.php
@@ -19,7 +19,7 @@ class EditorFileReferenceFilterTest extends KernelTestBase {
    *
    * @var array
    */
-  public static $modules = array('system', 'filter', 'editor', 'field', 'file', 'user');
+  protected static $modules = array('system', 'filter', 'editor', 'field', 'file', 'user');
 
   /**
    * @var \Drupal\filter\Plugin\FilterInterface[]
diff --git a/core/modules/editor/tests/src/Kernel/EditorFileUsageTest.php b/core/modules/editor/tests/src/Kernel/EditorFileUsageTest.php
index 0411388..ea7ded3 100644
--- a/core/modules/editor/tests/src/Kernel/EditorFileUsageTest.php
+++ b/core/modules/editor/tests/src/Kernel/EditorFileUsageTest.php
@@ -23,7 +23,7 @@ class EditorFileUsageTest extends EntityKernelTestBase {
    *
    * @var array
    */
-  public static $modules = array('editor', 'editor_test', 'node', 'file');
+  protected static $modules = array('editor', 'editor_test', 'node', 'file');
 
   protected function setUp() {
     parent::setUp();
diff --git a/core/modules/editor/tests/src/Kernel/EditorFilterIntegrationTest.php b/core/modules/editor/tests/src/Kernel/EditorFilterIntegrationTest.php
index 30f36e5..ede2b00 100644
--- a/core/modules/editor/tests/src/Kernel/EditorFilterIntegrationTest.php
+++ b/core/modules/editor/tests/src/Kernel/EditorFilterIntegrationTest.php
@@ -17,7 +17,7 @@ class EditorFilterIntegrationTest extends KernelTestBase {
   /**
    * {@inheritdoc}
    */
-  public static $modules = ['filter', 'editor', 'editor_test'];
+  protected static $modules = ['filter', 'editor', 'editor_test'];
 
   /**
    * Tests text format removal or disabling.
diff --git a/core/modules/editor/tests/src/Kernel/EditorImageDialogTest.php b/core/modules/editor/tests/src/Kernel/EditorImageDialogTest.php
index 329018b..953c145 100644
--- a/core/modules/editor/tests/src/Kernel/EditorImageDialogTest.php
+++ b/core/modules/editor/tests/src/Kernel/EditorImageDialogTest.php
@@ -28,7 +28,7 @@ class EditorImageDialogTest extends EntityKernelTestBase {
    *
    * @var array
    */
-  public static $modules = ['node', 'file', 'editor', 'editor_test', 'user', 'system'];
+  protected static $modules = ['node', 'file', 'editor', 'editor_test', 'user', 'system'];
 
   /**
    * Sets up the test.
diff --git a/core/modules/editor/tests/src/Kernel/EditorManagerTest.php b/core/modules/editor/tests/src/Kernel/EditorManagerTest.php
index b6077a5..1561a39 100644
--- a/core/modules/editor/tests/src/Kernel/EditorManagerTest.php
+++ b/core/modules/editor/tests/src/Kernel/EditorManagerTest.php
@@ -18,7 +18,7 @@ class EditorManagerTest extends KernelTestBase {
    *
    * @var array
    */
-  public static $modules = array('system', 'user', 'filter', 'editor');
+  protected static $modules = array('system', 'user', 'filter', 'editor');
 
   /**
    * The manager for text editor plugins.
diff --git a/core/modules/editor/tests/src/Kernel/QuickEditIntegrationTest.php b/core/modules/editor/tests/src/Kernel/QuickEditIntegrationTest.php
index d62cb68..d2101fc 100644
--- a/core/modules/editor/tests/src/Kernel/QuickEditIntegrationTest.php
+++ b/core/modules/editor/tests/src/Kernel/QuickEditIntegrationTest.php
@@ -26,7 +26,7 @@ class QuickEditIntegrationTest extends QuickEditTestBase {
   /**
    * {@inheritdoc}
    */
-  public static $modules = array('editor', 'editor_test');
+  protected static $modules = array('editor', 'editor_test');
 
   /**
    * The manager for editor plug-ins.
diff --git a/core/modules/field/tests/src/Kernel/Boolean/BooleanFormatterTest.php b/core/modules/field/tests/src/Kernel/Boolean/BooleanFormatterTest.php
index 94f5bc6..c6c389e 100644
--- a/core/modules/field/tests/src/Kernel/Boolean/BooleanFormatterTest.php
+++ b/core/modules/field/tests/src/Kernel/Boolean/BooleanFormatterTest.php
@@ -22,7 +22,7 @@ class BooleanFormatterTest extends KernelTestBase {
    *
    * @var array
    */
-  public static $modules = ['field', 'text', 'entity_test', 'user', 'system'];
+  protected static $modules = ['field', 'text', 'entity_test', 'user', 'system'];
 
   /**
    * @var string
diff --git a/core/modules/field/tests/src/Kernel/DisplayApiTest.php b/core/modules/field/tests/src/Kernel/DisplayApiTest.php
index c1218a6..b22ffc1 100644
--- a/core/modules/field/tests/src/Kernel/DisplayApiTest.php
+++ b/core/modules/field/tests/src/Kernel/DisplayApiTest.php
@@ -59,7 +59,7 @@ class DisplayApiTest extends FieldKernelTestBase {
   /**
    * {@inheritdoc}
    */
-  public static $modules = ['system'];
+  protected static $modules = ['system'];
 
   protected function setUp() {
     parent::setUp();
diff --git a/core/modules/field/tests/src/Kernel/Entity/Update/SqlContentEntityStorageSchemaColumnTest.php b/core/modules/field/tests/src/Kernel/Entity/Update/SqlContentEntityStorageSchemaColumnTest.php
index 05db0dc..3ad6a9a 100644
--- a/core/modules/field/tests/src/Kernel/Entity/Update/SqlContentEntityStorageSchemaColumnTest.php
+++ b/core/modules/field/tests/src/Kernel/Entity/Update/SqlContentEntityStorageSchemaColumnTest.php
@@ -18,7 +18,7 @@ class SqlContentEntityStorageSchemaColumnTest extends KernelTestBase {
   /**
    * {@inheritdoc}
    */
-  public static $modules = ['entity_test', 'field', 'text', 'user'];
+  protected static $modules = ['entity_test', 'field', 'text', 'user'];
 
   /**
    * The created entity.
diff --git a/core/modules/field/tests/src/Kernel/EntityReference/EntityReferenceItemTest.php b/core/modules/field/tests/src/Kernel/EntityReference/EntityReferenceItemTest.php
index e00848c..0cded31 100644
--- a/core/modules/field/tests/src/Kernel/EntityReference/EntityReferenceItemTest.php
+++ b/core/modules/field/tests/src/Kernel/EntityReference/EntityReferenceItemTest.php
@@ -37,7 +37,7 @@ class EntityReferenceItemTest extends FieldKernelTestBase {
    *
    * @var array
    */
-  public static $modules = ['node', 'comment', 'file', 'taxonomy', 'text', 'filter', 'views', 'field'];
+  protected static $modules = ['node', 'comment', 'file', 'taxonomy', 'text', 'filter', 'views', 'field'];
 
   /**
    * The taxonomy vocabulary to test with.
diff --git a/core/modules/field/tests/src/Kernel/EntityReference/EntityReferenceSettingsTest.php b/core/modules/field/tests/src/Kernel/EntityReference/EntityReferenceSettingsTest.php
index 780fe7b..1eaea1e 100644
--- a/core/modules/field/tests/src/Kernel/EntityReference/EntityReferenceSettingsTest.php
+++ b/core/modules/field/tests/src/Kernel/EntityReference/EntityReferenceSettingsTest.php
@@ -21,7 +21,7 @@ class EntityReferenceSettingsTest extends KernelTestBase {
   /**
    * {@inheritdoc}
    */
-  public static $modules = ['node', 'taxonomy', 'field', 'user', 'text', 'entity_reference', 'entity_test', 'system'];
+  protected static $modules = ['node', 'taxonomy', 'field', 'user', 'text', 'entity_reference', 'entity_test', 'system'];
 
   /**
    * Testing node type.
diff --git a/core/modules/field/tests/src/Kernel/EntityReference/Views/EntityReferenceRelationshipTest.php b/core/modules/field/tests/src/Kernel/EntityReference/Views/EntityReferenceRelationshipTest.php
index 5dc096f..a018518 100644
--- a/core/modules/field/tests/src/Kernel/EntityReference/Views/EntityReferenceRelationshipTest.php
+++ b/core/modules/field/tests/src/Kernel/EntityReference/Views/EntityReferenceRelationshipTest.php
@@ -39,7 +39,7 @@ class EntityReferenceRelationshipTest extends ViewsKernelTestBase {
    *
    * @var array
    */
-  public static $modules = ['user', 'field', 'entity_test', 'views', 'entity_reference_test_views'];
+  protected static $modules = ['user', 'field', 'entity_test', 'views', 'entity_reference_test_views'];
 
   /**
    * The entity_test entities used by the test.
diff --git a/core/modules/field/tests/src/Kernel/FieldDefinitionIntegrityTest.php b/core/modules/field/tests/src/Kernel/FieldDefinitionIntegrityTest.php
index b4add53..42167e9 100644
--- a/core/modules/field/tests/src/Kernel/FieldDefinitionIntegrityTest.php
+++ b/core/modules/field/tests/src/Kernel/FieldDefinitionIntegrityTest.php
@@ -15,7 +15,7 @@ class FieldDefinitionIntegrityTest extends KernelTestBase {
   /**
    * @var array
    */
-  public static $modules = ['system'];
+  protected static $modules = ['system'];
 
   /**
    * Tests the integrity of field plugin definitions.
diff --git a/core/modules/field/tests/src/Kernel/FieldImportChangeTest.php b/core/modules/field/tests/src/Kernel/FieldImportChangeTest.php
index 8cd0291..5286262 100644
--- a/core/modules/field/tests/src/Kernel/FieldImportChangeTest.php
+++ b/core/modules/field/tests/src/Kernel/FieldImportChangeTest.php
@@ -20,7 +20,7 @@ class FieldImportChangeTest extends FieldKernelTestBase {
    *
    * @var array
    */
-  public static $modules = array('field_test_config');
+  protected static $modules = array('field_test_config');
 
   /**
    * Tests importing an updated field.
diff --git a/core/modules/field/tests/src/Kernel/FieldImportDeleteTest.php b/core/modules/field/tests/src/Kernel/FieldImportDeleteTest.php
index b536fe8..2804b0b 100644
--- a/core/modules/field/tests/src/Kernel/FieldImportDeleteTest.php
+++ b/core/modules/field/tests/src/Kernel/FieldImportDeleteTest.php
@@ -22,7 +22,7 @@ class FieldImportDeleteTest extends FieldKernelTestBase {
    *
    * @var array
    */
-  public static $modules = array('field_test_config');
+  protected static $modules = array('field_test_config');
 
   /**
    * Tests deleting field storages and fields as part of config import.
diff --git a/core/modules/field/tests/src/Kernel/FieldImportDeleteUninstallTest.php b/core/modules/field/tests/src/Kernel/FieldImportDeleteUninstallTest.php
index dab6e0d..9130a00 100644
--- a/core/modules/field/tests/src/Kernel/FieldImportDeleteUninstallTest.php
+++ b/core/modules/field/tests/src/Kernel/FieldImportDeleteUninstallTest.php
@@ -21,7 +21,7 @@ class FieldImportDeleteUninstallTest extends FieldKernelTestBase {
    *
    * @var array
    */
-  public static $modules = array('telephone');
+  protected static $modules = array('telephone');
 
   protected function setUp() {
     parent::setUp();
diff --git a/core/modules/field/tests/src/Kernel/FieldKernelTestBase.php b/core/modules/field/tests/src/Kernel/FieldKernelTestBase.php
index 4d6bd51..cb27c97 100644
--- a/core/modules/field/tests/src/Kernel/FieldKernelTestBase.php
+++ b/core/modules/field/tests/src/Kernel/FieldKernelTestBase.php
@@ -19,7 +19,7 @@
    *
    * @var array
    */
-  public static $modules = ['user', 'system', 'field', 'text', 'entity_test', 'field_test'];
+  protected static $modules = ['user', 'system', 'field', 'text', 'entity_test', 'field_test'];
 
   /**
    * Bag of created field storages and fields.
diff --git a/core/modules/field/tests/src/Kernel/FieldStorageCrudTest.php b/core/modules/field/tests/src/Kernel/FieldStorageCrudTest.php
index da1948c..d8a8bcf 100644
--- a/core/modules/field/tests/src/Kernel/FieldStorageCrudTest.php
+++ b/core/modules/field/tests/src/Kernel/FieldStorageCrudTest.php
@@ -21,7 +21,7 @@ class FieldStorageCrudTest extends FieldKernelTestBase {
    *
    * @var array
    */
-  public static $modules = array();
+  protected static $modules = array();
 
   // TODO : test creation with
   // - a full fledged $field structure, check that all the values are there
diff --git a/core/modules/field/tests/src/Kernel/Migrate/d7/MigrateFieldFormatterSettingsTest.php b/core/modules/field/tests/src/Kernel/Migrate/d7/MigrateFieldFormatterSettingsTest.php
index 21cc3aa..516a19b 100644
--- a/core/modules/field/tests/src/Kernel/Migrate/d7/MigrateFieldFormatterSettingsTest.php
+++ b/core/modules/field/tests/src/Kernel/Migrate/d7/MigrateFieldFormatterSettingsTest.php
@@ -17,7 +17,7 @@
  */
 class MigrateFieldFormatterSettingsTest extends MigrateDrupal7TestBase {
 
-  public static $modules = [
+  protected static $modules = [
     'comment',
     'datetime',
     'file',
diff --git a/core/modules/field/tests/src/Kernel/Migrate/d7/MigrateFieldInstanceTest.php b/core/modules/field/tests/src/Kernel/Migrate/d7/MigrateFieldInstanceTest.php
index 2fa6d5c..d7503bd 100644
--- a/core/modules/field/tests/src/Kernel/Migrate/d7/MigrateFieldInstanceTest.php
+++ b/core/modules/field/tests/src/Kernel/Migrate/d7/MigrateFieldInstanceTest.php
@@ -21,7 +21,7 @@ class MigrateFieldInstanceTest extends MigrateDrupal7TestBase {
    *
    * @var array
    */
-  public static $modules = array(
+  protected static $modules = array(
     'comment',
     'datetime',
     'file',
diff --git a/core/modules/field/tests/src/Kernel/Migrate/d7/MigrateFieldInstanceWidgetSettingsTest.php b/core/modules/field/tests/src/Kernel/Migrate/d7/MigrateFieldInstanceWidgetSettingsTest.php
index dd4decd..a5894a3 100644
--- a/core/modules/field/tests/src/Kernel/Migrate/d7/MigrateFieldInstanceWidgetSettingsTest.php
+++ b/core/modules/field/tests/src/Kernel/Migrate/d7/MigrateFieldInstanceWidgetSettingsTest.php
@@ -18,7 +18,7 @@ class MigrateFieldInstanceWidgetSettingsTest extends MigrateDrupal7TestBase {
    *
    * @var array
    */
-  public static $modules = array(
+  protected static $modules = array(
     'comment',
     'datetime',
     'field',
diff --git a/core/modules/field/tests/src/Kernel/Migrate/d7/MigrateFieldTest.php b/core/modules/field/tests/src/Kernel/Migrate/d7/MigrateFieldTest.php
index b1c2fb8..29584f3 100644
--- a/core/modules/field/tests/src/Kernel/Migrate/d7/MigrateFieldTest.php
+++ b/core/modules/field/tests/src/Kernel/Migrate/d7/MigrateFieldTest.php
@@ -18,7 +18,7 @@ class MigrateFieldTest extends MigrateDrupal7TestBase {
    *
    * @var array
    */
-  public static $modules = array(
+  protected static $modules = array(
     'comment',
     'datetime',
     'file',
diff --git a/core/modules/field/tests/src/Kernel/Migrate/d7/MigrateViewModesTest.php b/core/modules/field/tests/src/Kernel/Migrate/d7/MigrateViewModesTest.php
index ac94a87..bb4ec56 100644
--- a/core/modules/field/tests/src/Kernel/Migrate/d7/MigrateViewModesTest.php
+++ b/core/modules/field/tests/src/Kernel/Migrate/d7/MigrateViewModesTest.php
@@ -13,7 +13,7 @@
  */
 class MigrateViewModesTest extends MigrateDrupal7TestBase {
 
-  public static $modules = ['comment', 'node', 'taxonomy'];
+  protected static $modules = ['comment', 'node', 'taxonomy'];
 
   /**
    * {@inheritdoc}
diff --git a/core/modules/field/tests/src/Kernel/Number/NumberItemTest.php b/core/modules/field/tests/src/Kernel/Number/NumberItemTest.php
index 25b99bb..f036f68 100644
--- a/core/modules/field/tests/src/Kernel/Number/NumberItemTest.php
+++ b/core/modules/field/tests/src/Kernel/Number/NumberItemTest.php
@@ -21,7 +21,7 @@ class NumberItemTest extends FieldKernelTestBase {
    *
    * @var array
    */
-  public static $modules = array();
+  protected static $modules = array();
 
   protected function setUp() {
     parent::setUp();
diff --git a/core/modules/field/tests/src/Kernel/Plugin/migrate/source/d6/FieldInstancePerFormDisplayTest.php b/core/modules/field/tests/src/Kernel/Plugin/migrate/source/d6/FieldInstancePerFormDisplayTest.php
index a4ef2f6..b1c2a6a 100644
--- a/core/modules/field/tests/src/Kernel/Plugin/migrate/source/d6/FieldInstancePerFormDisplayTest.php
+++ b/core/modules/field/tests/src/Kernel/Plugin/migrate/source/d6/FieldInstancePerFormDisplayTest.php
@@ -15,7 +15,7 @@ class FieldInstancePerFormDisplayTest extends MigrateSqlSourceTestBase {
   /**
    * {@inheritdoc}
    */
-  public static $modules = ['field', 'migrate_drupal'];
+  protected static $modules = ['field', 'migrate_drupal'];
 
   /**
    * {@inheritdoc}
diff --git a/core/modules/field/tests/src/Kernel/Plugin/migrate/source/d6/FieldInstancePerViewModeTest.php b/core/modules/field/tests/src/Kernel/Plugin/migrate/source/d6/FieldInstancePerViewModeTest.php
index baea562..e46d00b 100644
--- a/core/modules/field/tests/src/Kernel/Plugin/migrate/source/d6/FieldInstancePerViewModeTest.php
+++ b/core/modules/field/tests/src/Kernel/Plugin/migrate/source/d6/FieldInstancePerViewModeTest.php
@@ -15,7 +15,7 @@ class FieldInstancePerViewModeTest extends MigrateSqlSourceTestBase {
   /**
    * {@inheritdoc}
    */
-  public static $modules = ['field', 'migrate_drupal', 'node', 'user'];
+  protected static $modules = ['field', 'migrate_drupal', 'node', 'user'];
 
   /**
    * {@inheritdoc}
diff --git a/core/modules/field/tests/src/Kernel/Plugin/migrate/source/d6/FieldInstanceTest.php b/core/modules/field/tests/src/Kernel/Plugin/migrate/source/d6/FieldInstanceTest.php
index bfbddca..2fd757f 100644
--- a/core/modules/field/tests/src/Kernel/Plugin/migrate/source/d6/FieldInstanceTest.php
+++ b/core/modules/field/tests/src/Kernel/Plugin/migrate/source/d6/FieldInstanceTest.php
@@ -15,7 +15,7 @@ class FieldInstanceTest extends MigrateSqlSourceTestBase {
   /**
    * {@inheritdoc}
    */
-  public static $modules = ['field', 'migrate_drupal'];
+  protected static $modules = ['field', 'migrate_drupal'];
 
   /**
    * {@inheritdoc}
diff --git a/core/modules/field/tests/src/Kernel/Plugin/migrate/source/d6/FieldTest.php b/core/modules/field/tests/src/Kernel/Plugin/migrate/source/d6/FieldTest.php
index 0602641..e83d05e 100644
--- a/core/modules/field/tests/src/Kernel/Plugin/migrate/source/d6/FieldTest.php
+++ b/core/modules/field/tests/src/Kernel/Plugin/migrate/source/d6/FieldTest.php
@@ -15,7 +15,7 @@ class FieldTest extends MigrateSqlSourceTestBase {
   /**
    * {@inheritdoc}
    */
-  public static $modules = ['field', 'migrate_drupal'];
+  protected static $modules = ['field', 'migrate_drupal'];
 
   /**
    * {@inheritdoc}
diff --git a/core/modules/field/tests/src/Kernel/Plugin/migrate/source/d7/FieldInstancePerFormDisplayTest.php b/core/modules/field/tests/src/Kernel/Plugin/migrate/source/d7/FieldInstancePerFormDisplayTest.php
index e2de4fd..8f30272 100644
--- a/core/modules/field/tests/src/Kernel/Plugin/migrate/source/d7/FieldInstancePerFormDisplayTest.php
+++ b/core/modules/field/tests/src/Kernel/Plugin/migrate/source/d7/FieldInstancePerFormDisplayTest.php
@@ -15,7 +15,7 @@ class FieldInstancePerFormDisplayTest extends MigrateSqlSourceTestBase {
   /**
    * {@inheritdoc}
    */
-  public static $modules = ['field', 'migrate_drupal'];
+  protected static $modules = ['field', 'migrate_drupal'];
 
   /**
    * {@inheritdoc}
diff --git a/core/modules/field/tests/src/Kernel/Plugin/migrate/source/d7/FieldInstancePerViewModeTest.php b/core/modules/field/tests/src/Kernel/Plugin/migrate/source/d7/FieldInstancePerViewModeTest.php
index 6ed72e4..e725a84 100644
--- a/core/modules/field/tests/src/Kernel/Plugin/migrate/source/d7/FieldInstancePerViewModeTest.php
+++ b/core/modules/field/tests/src/Kernel/Plugin/migrate/source/d7/FieldInstancePerViewModeTest.php
@@ -15,7 +15,7 @@ class FieldInstancePerViewModeTest extends MigrateSqlSourceTestBase {
   /**
    * {@inheritdoc}
    */
-  public static $modules = ['field', 'migrate_drupal'];
+  protected static $modules = ['field', 'migrate_drupal'];
 
   /**
    * {@inheritdoc}
diff --git a/core/modules/field/tests/src/Kernel/Plugin/migrate/source/d7/FieldInstanceTest.php b/core/modules/field/tests/src/Kernel/Plugin/migrate/source/d7/FieldInstanceTest.php
index a0b8ec1..ec03404 100644
--- a/core/modules/field/tests/src/Kernel/Plugin/migrate/source/d7/FieldInstanceTest.php
+++ b/core/modules/field/tests/src/Kernel/Plugin/migrate/source/d7/FieldInstanceTest.php
@@ -15,7 +15,7 @@ class FieldInstanceTest extends MigrateSqlSourceTestBase {
   /**
    * {@inheritdoc}
    */
-  public static $modules = ['field', 'migrate_drupal'];
+  protected static $modules = ['field', 'migrate_drupal'];
 
   /**
    * {@inheritdoc}
diff --git a/core/modules/field/tests/src/Kernel/Plugin/migrate/source/d7/FieldTest.php b/core/modules/field/tests/src/Kernel/Plugin/migrate/source/d7/FieldTest.php
index 707d624..101bf39 100644
--- a/core/modules/field/tests/src/Kernel/Plugin/migrate/source/d7/FieldTest.php
+++ b/core/modules/field/tests/src/Kernel/Plugin/migrate/source/d7/FieldTest.php
@@ -15,7 +15,7 @@ class FieldTest extends MigrateSqlSourceTestBase {
   /**
    * {@inheritdoc}
    */
-  public static $modules = ['field', 'migrate_drupal'];
+  protected static $modules = ['field', 'migrate_drupal'];
 
   /**
    * {@inheritdoc}
diff --git a/core/modules/field/tests/src/Kernel/Plugin/migrate/source/d7/ViewModeTest.php b/core/modules/field/tests/src/Kernel/Plugin/migrate/source/d7/ViewModeTest.php
index 42c7bce..44142f5 100644
--- a/core/modules/field/tests/src/Kernel/Plugin/migrate/source/d7/ViewModeTest.php
+++ b/core/modules/field/tests/src/Kernel/Plugin/migrate/source/d7/ViewModeTest.php
@@ -15,7 +15,7 @@ class ViewModeTest extends MigrateSqlSourceTestBase {
   /**
    * {@inheritdoc}
    */
-  public static $modules = ['field', 'migrate_drupal'];
+  protected static $modules = ['field', 'migrate_drupal'];
 
   /**
    * {@inheritdoc}
diff --git a/core/modules/field/tests/src/Kernel/ShapeItemTest.php b/core/modules/field/tests/src/Kernel/ShapeItemTest.php
index 644a15f..c3dea0c 100644
--- a/core/modules/field/tests/src/Kernel/ShapeItemTest.php
+++ b/core/modules/field/tests/src/Kernel/ShapeItemTest.php
@@ -20,7 +20,7 @@ class ShapeItemTest extends FieldKernelTestBase {
    *
    * @var array
    */
-  public static $modules = array('field_test');
+  protected static $modules = array('field_test');
 
   /**
    * The name of the field to use in this test.
diff --git a/core/modules/field/tests/src/Kernel/String/RawStringFormatterTest.php b/core/modules/field/tests/src/Kernel/String/RawStringFormatterTest.php
index 02d72d0..9359351 100644
--- a/core/modules/field/tests/src/Kernel/String/RawStringFormatterTest.php
+++ b/core/modules/field/tests/src/Kernel/String/RawStringFormatterTest.php
@@ -23,7 +23,7 @@ class RawStringFormatterTest extends KernelTestBase {
    *
    * @var array
    */
-  public static $modules = array('field', 'text', 'entity_test', 'system', 'filter', 'user');
+  protected static $modules = array('field', 'text', 'entity_test', 'system', 'filter', 'user');
 
   /**
    * @var string
diff --git a/core/modules/field/tests/src/Kernel/String/StringFormatterTest.php b/core/modules/field/tests/src/Kernel/String/StringFormatterTest.php
index b52a92f..62f9cce 100644
--- a/core/modules/field/tests/src/Kernel/String/StringFormatterTest.php
+++ b/core/modules/field/tests/src/Kernel/String/StringFormatterTest.php
@@ -23,7 +23,7 @@ class StringFormatterTest extends KernelTestBase {
    *
    * @var array
    */
-  public static $modules = array('field', 'text', 'entity_test', 'system', 'filter', 'user');
+  protected static $modules = array('field', 'text', 'entity_test', 'system', 'filter', 'user');
 
   /**
    * @var string
diff --git a/core/modules/field/tests/src/Kernel/String/UuidFormatterTest.php b/core/modules/field/tests/src/Kernel/String/UuidFormatterTest.php
index 0eeb778..4059cc6 100644
--- a/core/modules/field/tests/src/Kernel/String/UuidFormatterTest.php
+++ b/core/modules/field/tests/src/Kernel/String/UuidFormatterTest.php
@@ -18,7 +18,7 @@ class UuidFormatterTest extends KernelTestBase {
    *
    * @var array
    */
-  public static $modules = ['field', 'entity_test', 'system', 'user'];
+  protected static $modules = ['field', 'entity_test', 'system', 'user'];
 
   /**
    * {@inheritdoc}
diff --git a/core/modules/field/tests/src/Kernel/TestItemTest.php b/core/modules/field/tests/src/Kernel/TestItemTest.php
index 6766b40..33a06f9 100644
--- a/core/modules/field/tests/src/Kernel/TestItemTest.php
+++ b/core/modules/field/tests/src/Kernel/TestItemTest.php
@@ -21,7 +21,7 @@ class TestItemTest extends FieldKernelTestBase {
    *
    * @var array
    */
-  public static $modules = array('field_test');
+  protected static $modules = array('field_test');
 
   /**
    * The name of the field to use in this test.
diff --git a/core/modules/field/tests/src/Kernel/TestItemWithDependenciesTest.php b/core/modules/field/tests/src/Kernel/TestItemWithDependenciesTest.php
index 9766a06..53dc72e 100644
--- a/core/modules/field/tests/src/Kernel/TestItemWithDependenciesTest.php
+++ b/core/modules/field/tests/src/Kernel/TestItemWithDependenciesTest.php
@@ -17,7 +17,7 @@ class TestItemWithDependenciesTest extends FieldKernelTestBase {
    *
    * @var array
    */
-  public static $modules = array('field_test');
+  protected static $modules = array('field_test');
 
   /**
    * The name of the field to use in this test.
diff --git a/core/modules/field/tests/src/Kernel/Timestamp/TimestampFormatterTest.php b/core/modules/field/tests/src/Kernel/Timestamp/TimestampFormatterTest.php
index ee97cab..59a36bb 100644
--- a/core/modules/field/tests/src/Kernel/Timestamp/TimestampFormatterTest.php
+++ b/core/modules/field/tests/src/Kernel/Timestamp/TimestampFormatterTest.php
@@ -21,7 +21,7 @@ class TimestampFormatterTest extends KernelTestBase {
   /**
    * {@inheritdoc}
    */
-  public static $modules = ['system', 'field', 'text', 'entity_test', 'user'];
+  protected static $modules = ['system', 'field', 'text', 'entity_test', 'user'];
 
   /**
    * @var string
diff --git a/core/modules/field/tests/src/Kernel/TranslationTest.php b/core/modules/field/tests/src/Kernel/TranslationTest.php
index 78172a3..2991045 100644
--- a/core/modules/field/tests/src/Kernel/TranslationTest.php
+++ b/core/modules/field/tests/src/Kernel/TranslationTest.php
@@ -23,7 +23,7 @@ class TranslationTest extends FieldKernelTestBase {
    *
    * @var array
    */
-  public static $modules = array('language', 'node');
+  protected static $modules = array('language', 'node');
 
   /**
    * The name of the field to use in this test.
diff --git a/core/modules/field_ui/tests/src/Functional/EntityDisplayTest.php b/core/modules/field_ui/tests/src/Functional/EntityDisplayTest.php
index c9cfc05..b9f7540 100644
--- a/core/modules/field_ui/tests/src/Functional/EntityDisplayTest.php
+++ b/core/modules/field_ui/tests/src/Functional/EntityDisplayTest.php
@@ -14,7 +14,7 @@ class EntityDisplayTest extends BrowserTestBase {
   /**
    * {@inheritdoc}
    */
-  public static $modules = ['field_ui', 'entity_test'];
+  protected static $modules = ['field_ui', 'entity_test'];
 
   /**
    * {@inheritdoc}
diff --git a/core/modules/field_ui/tests/src/FunctionalJavascript/EntityDisplayTest.php b/core/modules/field_ui/tests/src/FunctionalJavascript/EntityDisplayTest.php
index 319e8df..b6ba38f 100644
--- a/core/modules/field_ui/tests/src/FunctionalJavascript/EntityDisplayTest.php
+++ b/core/modules/field_ui/tests/src/FunctionalJavascript/EntityDisplayTest.php
@@ -15,7 +15,7 @@ class EntityDisplayTest extends JavascriptTestBase {
   /**
    * {@inheritdoc}
    */
-  public static $modules = ['field_ui', 'entity_test'];
+  protected static $modules = ['field_ui', 'entity_test'];
 
   /**
    * {@inheritdoc}
diff --git a/core/modules/field_ui/tests/src/Kernel/EntityDisplayTest.php b/core/modules/field_ui/tests/src/Kernel/EntityDisplayTest.php
index d060163..6cc1cff 100644
--- a/core/modules/field_ui/tests/src/Kernel/EntityDisplayTest.php
+++ b/core/modules/field_ui/tests/src/Kernel/EntityDisplayTest.php
@@ -29,7 +29,7 @@ class EntityDisplayTest extends KernelTestBase {
    *
    * @var string[]
    */
-  public static $modules = array('field_ui', 'field', 'entity_test', 'user', 'text', 'field_test', 'node', 'system');
+  protected static $modules = array('field_ui', 'field', 'entity_test', 'user', 'text', 'field_test', 'node', 'system');
 
   protected function setUp() {
     parent::setUp();
diff --git a/core/modules/field_ui/tests/src/Kernel/EntityFormDisplayTest.php b/core/modules/field_ui/tests/src/Kernel/EntityFormDisplayTest.php
index 6f770d6..969b3e5 100644
--- a/core/modules/field_ui/tests/src/Kernel/EntityFormDisplayTest.php
+++ b/core/modules/field_ui/tests/src/Kernel/EntityFormDisplayTest.php
@@ -20,7 +20,7 @@ class EntityFormDisplayTest extends KernelTestBase {
    *
    * @var string[]
    */
-  public static $modules = ['field_ui', 'field', 'entity_test', 'field_test', 'user', 'text'];
+  protected static $modules = ['field_ui', 'field', 'entity_test', 'field_test', 'user', 'text'];
 
   protected function setUp() {
     parent::setUp();
diff --git a/core/modules/file/tests/src/Kernel/AccessTest.php b/core/modules/file/tests/src/Kernel/AccessTest.php
index c2fa65b..dd731fe 100644
--- a/core/modules/file/tests/src/Kernel/AccessTest.php
+++ b/core/modules/file/tests/src/Kernel/AccessTest.php
@@ -18,7 +18,7 @@ class AccessTest extends KernelTestBase {
    *
    * @var array
    */
-  public static $modules = ['file', 'system', 'user'];
+  protected static $modules = ['file', 'system', 'user'];
 
   /**
    * An authenticated user.
diff --git a/core/modules/file/tests/src/Kernel/FileItemTest.php b/core/modules/file/tests/src/Kernel/FileItemTest.php
index 747d5da..40378f2 100644
--- a/core/modules/file/tests/src/Kernel/FileItemTest.php
+++ b/core/modules/file/tests/src/Kernel/FileItemTest.php
@@ -23,7 +23,7 @@ class FileItemTest extends FieldKernelTestBase {
    *
    * @var array
    */
-  public static $modules = array('file');
+  protected static $modules = array('file');
 
   /**
    * Created file entity.
diff --git a/core/modules/file/tests/src/Kernel/FileItemValidationTest.php b/core/modules/file/tests/src/Kernel/FileItemValidationTest.php
index a5c2d69..927afec 100644
--- a/core/modules/file/tests/src/Kernel/FileItemValidationTest.php
+++ b/core/modules/file/tests/src/Kernel/FileItemValidationTest.php
@@ -20,7 +20,7 @@ class FileItemValidationTest extends KernelTestBase {
   /**
    * {@inheritdoc}
    */
-  public static $modules = ['file', 'image', 'entity_test', 'field', 'user', 'system'];
+  protected static $modules = ['file', 'image', 'entity_test', 'field', 'user', 'system'];
 
   /**
    * A user.
diff --git a/core/modules/file/tests/src/Kernel/FileManagedUnitTestBase.php b/core/modules/file/tests/src/Kernel/FileManagedUnitTestBase.php
index 4db377d..cecff42 100644
--- a/core/modules/file/tests/src/Kernel/FileManagedUnitTestBase.php
+++ b/core/modules/file/tests/src/Kernel/FileManagedUnitTestBase.php
@@ -18,7 +18,7 @@
    *
    * @var array
    */
-  public static $modules = array('file_test', 'file', 'system', 'field', 'user');
+  protected static $modules = array('file_test', 'file', 'system', 'field', 'user');
 
   protected function setUp() {
     parent::setUp();
diff --git a/core/modules/file/tests/src/Kernel/Formatter/FileEntityFormatterTest.php b/core/modules/file/tests/src/Kernel/Formatter/FileEntityFormatterTest.php
index 743da80..a9234cb 100644
--- a/core/modules/file/tests/src/Kernel/Formatter/FileEntityFormatterTest.php
+++ b/core/modules/file/tests/src/Kernel/Formatter/FileEntityFormatterTest.php
@@ -17,7 +17,7 @@ class FileEntityFormatterTest extends KernelTestBase {
   /**
    * {@inheritdoc}
    */
-  public static $modules = ['file', 'user'];
+  protected static $modules = ['file', 'user'];
 
   /**
    * The files.
diff --git a/core/modules/file/tests/src/Kernel/Migrate/MigrateFileStubTest.php b/core/modules/file/tests/src/Kernel/Migrate/MigrateFileStubTest.php
index 2965086..9864ef9 100644
--- a/core/modules/file/tests/src/Kernel/Migrate/MigrateFileStubTest.php
+++ b/core/modules/file/tests/src/Kernel/Migrate/MigrateFileStubTest.php
@@ -17,7 +17,7 @@ class MigrateFileStubTest extends MigrateDrupalTestBase {
   /**
    * {@inheritdoc}
    */
-  public static $modules = ['file'];
+  protected static $modules = ['file'];
 
   /**
    * {@inheritdoc}
diff --git a/core/modules/file/tests/src/Kernel/Migrate/d7/MigrateFileTest.php b/core/modules/file/tests/src/Kernel/Migrate/d7/MigrateFileTest.php
index 240c9e0..0aaf1e7 100644
--- a/core/modules/file/tests/src/Kernel/Migrate/d7/MigrateFileTest.php
+++ b/core/modules/file/tests/src/Kernel/Migrate/d7/MigrateFileTest.php
@@ -14,7 +14,7 @@
  */
 class MigrateFileTest extends MigrateDrupal7TestBase {
 
-  public static $modules = ['file'];
+  protected static $modules = ['file'];
 
   /**
    * {@inheritdoc}
diff --git a/core/modules/file/tests/src/Kernel/Plugin/migrate/source/d6/FileTest.php b/core/modules/file/tests/src/Kernel/Plugin/migrate/source/d6/FileTest.php
index cc8c9b3..4b6ac3d 100644
--- a/core/modules/file/tests/src/Kernel/Plugin/migrate/source/d6/FileTest.php
+++ b/core/modules/file/tests/src/Kernel/Plugin/migrate/source/d6/FileTest.php
@@ -16,7 +16,7 @@ class FileTest extends MigrateSqlSourceTestBase {
   /**
    * {@inheritdoc}
    */
-  public static $modules = ['file', 'migrate_drupal'];
+  protected static $modules = ['file', 'migrate_drupal'];
 
   /**
    * {@inheritdoc}
diff --git a/core/modules/file/tests/src/Kernel/Plugin/migrate/source/d6/UploadInstanceTest.php b/core/modules/file/tests/src/Kernel/Plugin/migrate/source/d6/UploadInstanceTest.php
index 711b36f..e2d34b4 100644
--- a/core/modules/file/tests/src/Kernel/Plugin/migrate/source/d6/UploadInstanceTest.php
+++ b/core/modules/file/tests/src/Kernel/Plugin/migrate/source/d6/UploadInstanceTest.php
@@ -16,7 +16,7 @@ class UploadInstanceTest extends MigrateSqlSourceTestBase {
   /**
    * {@inheritdoc}
    */
-  public static $modules = ['file', 'migrate_drupal'];
+  protected static $modules = ['file', 'migrate_drupal'];
 
   /**
    * {@inheritdoc}
diff --git a/core/modules/file/tests/src/Kernel/Plugin/migrate/source/d6/UploadTest.php b/core/modules/file/tests/src/Kernel/Plugin/migrate/source/d6/UploadTest.php
index 96389d5..6803be7 100644
--- a/core/modules/file/tests/src/Kernel/Plugin/migrate/source/d6/UploadTest.php
+++ b/core/modules/file/tests/src/Kernel/Plugin/migrate/source/d6/UploadTest.php
@@ -16,7 +16,7 @@ class UploadTest extends MigrateSqlSourceTestBase {
   /**
    * {@inheritdoc}
    */
-  public static $modules = ['file', 'migrate_drupal'];
+  protected static $modules = ['file', 'migrate_drupal'];
 
   /**
    * {@inheritdoc}
diff --git a/core/modules/file/tests/src/Kernel/Plugin/migrate/source/d7/FileTest.php b/core/modules/file/tests/src/Kernel/Plugin/migrate/source/d7/FileTest.php
index 8ae0ec4..425a0d3 100644
--- a/core/modules/file/tests/src/Kernel/Plugin/migrate/source/d7/FileTest.php
+++ b/core/modules/file/tests/src/Kernel/Plugin/migrate/source/d7/FileTest.php
@@ -15,7 +15,7 @@ class FileTest extends MigrateSqlSourceTestBase {
   /**
    * {@inheritdoc}
    */
-  public static $modules = ['file', 'migrate_drupal'];
+  protected static $modules = ['file', 'migrate_drupal'];
 
   /**
    * {@inheritdoc}
diff --git a/core/modules/file/tests/src/Kernel/Views/ExtensionViewsFieldTest.php b/core/modules/file/tests/src/Kernel/Views/ExtensionViewsFieldTest.php
index 221c011..89fa6b6 100644
--- a/core/modules/file/tests/src/Kernel/Views/ExtensionViewsFieldTest.php
+++ b/core/modules/file/tests/src/Kernel/Views/ExtensionViewsFieldTest.php
@@ -18,7 +18,7 @@ class ExtensionViewsFieldTest extends ViewsKernelTestBase {
   /**
    * {@inheritdoc}
    */
-  public static $modules = array('file', 'file_test_views', 'user');
+  protected static $modules = array('file', 'file_test_views', 'user');
 
   /**
    * Views used by this test.
diff --git a/core/modules/file/tests/src/Kernel/Views/FileViewsFieldAccessTest.php b/core/modules/file/tests/src/Kernel/Views/FileViewsFieldAccessTest.php
index 18a6f51..d714bff 100644
--- a/core/modules/file/tests/src/Kernel/Views/FileViewsFieldAccessTest.php
+++ b/core/modules/file/tests/src/Kernel/Views/FileViewsFieldAccessTest.php
@@ -17,7 +17,7 @@ class FileViewsFieldAccessTest extends FieldFieldAccessTestBase {
   /**
    * {@inheritdoc}
    */
-  public static $modules = ['file', 'entity_test', 'language', 'user'];
+  protected static $modules = ['file', 'entity_test', 'language', 'user'];
 
   /**
    * {@inheritdoc}
diff --git a/core/modules/filter/tests/src/Kernel/FilterAPITest.php b/core/modules/filter/tests/src/Kernel/FilterAPITest.php
index 50189a6..c82dbc3 100644
--- a/core/modules/filter/tests/src/Kernel/FilterAPITest.php
+++ b/core/modules/filter/tests/src/Kernel/FilterAPITest.php
@@ -19,7 +19,7 @@
  */
 class FilterAPITest extends EntityKernelTestBase {
 
-  public static $modules = array('system', 'filter', 'filter_test', 'user');
+  protected static $modules = array('system', 'filter', 'filter_test', 'user');
 
   protected function setUp() {
     parent::setUp();
diff --git a/core/modules/filter/tests/src/Kernel/FilterCrudTest.php b/core/modules/filter/tests/src/Kernel/FilterCrudTest.php
index 0a9be18..8615f71 100644
--- a/core/modules/filter/tests/src/Kernel/FilterCrudTest.php
+++ b/core/modules/filter/tests/src/Kernel/FilterCrudTest.php
@@ -17,7 +17,7 @@ class FilterCrudTest extends KernelTestBase {
    *
    * @var array
    */
-  public static $modules = ['filter', 'filter_test', 'system', 'user'];
+  protected static $modules = ['filter', 'filter_test', 'system', 'user'];
 
   /**
    * Tests CRUD operations for text formats and filters.
diff --git a/core/modules/filter/tests/src/Kernel/FilterDefaultConfigTest.php b/core/modules/filter/tests/src/Kernel/FilterDefaultConfigTest.php
index b4ce50c..f1c5678 100644
--- a/core/modules/filter/tests/src/Kernel/FilterDefaultConfigTest.php
+++ b/core/modules/filter/tests/src/Kernel/FilterDefaultConfigTest.php
@@ -13,7 +13,7 @@
  */
 class FilterDefaultConfigTest extends KernelTestBase {
 
-  public static $modules = array('system', 'user', 'filter', 'filter_test');
+  protected static $modules = array('system', 'user', 'filter', 'filter_test');
 
   protected function setUp() {
     parent::setUp();
diff --git a/core/modules/filter/tests/src/Kernel/FilterKernelTest.php b/core/modules/filter/tests/src/Kernel/FilterKernelTest.php
index 06c1e4b..fca9141 100644
--- a/core/modules/filter/tests/src/Kernel/FilterKernelTest.php
+++ b/core/modules/filter/tests/src/Kernel/FilterKernelTest.php
@@ -22,7 +22,7 @@ class FilterKernelTest extends KernelTestBase {
    *
    * @var array
    */
-  public static $modules = array('system', 'filter');
+  protected static $modules = array('system', 'filter');
 
   /**
    * @var \Drupal\filter\Plugin\FilterInterface[]
diff --git a/core/modules/filter/tests/src/Kernel/FilterSettingsTest.php b/core/modules/filter/tests/src/Kernel/FilterSettingsTest.php
index dc77eb4..60b70b2 100644
--- a/core/modules/filter/tests/src/Kernel/FilterSettingsTest.php
+++ b/core/modules/filter/tests/src/Kernel/FilterSettingsTest.php
@@ -17,7 +17,7 @@ class FilterSettingsTest extends KernelTestBase {
    *
    * @var array
    */
-  public static $modules = array('filter');
+  protected static $modules = array('filter');
 
   /**
    * Tests explicit and implicit default settings for filters.
diff --git a/core/modules/filter/tests/src/Kernel/Migrate/d7/MigrateFilterFormatTest.php b/core/modules/filter/tests/src/Kernel/Migrate/d7/MigrateFilterFormatTest.php
index e4053ae..a036896 100644
--- a/core/modules/filter/tests/src/Kernel/Migrate/d7/MigrateFilterFormatTest.php
+++ b/core/modules/filter/tests/src/Kernel/Migrate/d7/MigrateFilterFormatTest.php
@@ -16,7 +16,7 @@ class MigrateFilterFormatTest extends MigrateDrupal7TestBase {
   /**
    * {@inheritdoc}
    */
-  public static $modules = array('filter');
+  protected static $modules = array('filter');
 
   /**
    * {@inheritdoc}
diff --git a/core/modules/filter/tests/src/Kernel/Plugin/migrate/process/FilterIdTest.php b/core/modules/filter/tests/src/Kernel/Plugin/migrate/process/FilterIdTest.php
index 1206734..25cdd98 100644
--- a/core/modules/filter/tests/src/Kernel/Plugin/migrate/process/FilterIdTest.php
+++ b/core/modules/filter/tests/src/Kernel/Plugin/migrate/process/FilterIdTest.php
@@ -19,7 +19,7 @@ class FilterIdTest extends KernelTestBase {
   /**
    * {@inheritdoc}
    */
-  public static $modules = ['filter'];
+  protected static $modules = ['filter'];
 
   /**
    * The mocked MigrateExecutable.
diff --git a/core/modules/filter/tests/src/Kernel/Plugin/migrate/source/d6/FilterFormatTest.php b/core/modules/filter/tests/src/Kernel/Plugin/migrate/source/d6/FilterFormatTest.php
index a3e708b..18448d1 100644
--- a/core/modules/filter/tests/src/Kernel/Plugin/migrate/source/d6/FilterFormatTest.php
+++ b/core/modules/filter/tests/src/Kernel/Plugin/migrate/source/d6/FilterFormatTest.php
@@ -16,7 +16,7 @@ class FilterFormatTest extends MigrateSqlSourceTestBase {
   /**
    * {@inheritdoc}
    */
-  public static $modules = ['filter', 'migrate_drupal'];
+  protected static $modules = ['filter', 'migrate_drupal'];
 
   /**
    * {@inheritdoc}
diff --git a/core/modules/filter/tests/src/Kernel/Plugin/migrate/source/d7/FilterFormatTest.php b/core/modules/filter/tests/src/Kernel/Plugin/migrate/source/d7/FilterFormatTest.php
index f68b935..40c773f 100644
--- a/core/modules/filter/tests/src/Kernel/Plugin/migrate/source/d7/FilterFormatTest.php
+++ b/core/modules/filter/tests/src/Kernel/Plugin/migrate/source/d7/FilterFormatTest.php
@@ -16,7 +16,7 @@ class FilterFormatTest extends MigrateSqlSourceTestBase {
   /**
    * {@inheritdoc}
    */
-  public static $modules = ['filter', 'migrate_drupal'];
+  protected static $modules = ['filter', 'migrate_drupal'];
 
   /**
    * {@inheritdoc}
diff --git a/core/modules/filter/tests/src/Kernel/TextFormatElementFormTest.php b/core/modules/filter/tests/src/Kernel/TextFormatElementFormTest.php
index 8fca62e..d4c8ed7 100644
--- a/core/modules/filter/tests/src/Kernel/TextFormatElementFormTest.php
+++ b/core/modules/filter/tests/src/Kernel/TextFormatElementFormTest.php
@@ -28,7 +28,7 @@ class TextFormatElementFormTest extends KernelTestBase implements FormInterface
    *
    * @var array
    */
-  public static $modules = ['system', 'user', 'filter', 'filter_test', 'editor'];
+  protected static $modules = ['system', 'user', 'filter', 'filter_test', 'editor'];
 
   /**
    * Sets up the test.
diff --git a/core/modules/forum/tests/src/Kernel/ForumValidationTest.php b/core/modules/forum/tests/src/Kernel/ForumValidationTest.php
index 9b9661b..2bbac72 100644
--- a/core/modules/forum/tests/src/Kernel/ForumValidationTest.php
+++ b/core/modules/forum/tests/src/Kernel/ForumValidationTest.php
@@ -18,7 +18,7 @@ class ForumValidationTest extends EntityKernelTestBase {
    *
    * @var array
    */
-  public static $modules = ['node', 'options', 'comment', 'taxonomy', 'forum'];
+  protected static $modules = ['node', 'options', 'comment', 'taxonomy', 'forum'];
 
   /**
    * Tests the forum validation constraints.
diff --git a/core/modules/forum/tests/src/Kernel/Migrate/d6/MigrateForumConfigsTest.php b/core/modules/forum/tests/src/Kernel/Migrate/d6/MigrateForumConfigsTest.php
index 34c8a5b..985be9a 100644
--- a/core/modules/forum/tests/src/Kernel/Migrate/d6/MigrateForumConfigsTest.php
+++ b/core/modules/forum/tests/src/Kernel/Migrate/d6/MigrateForumConfigsTest.php
@@ -17,7 +17,7 @@ class MigrateForumConfigsTest extends MigrateDrupal6TestBase {
   /**
    * {@inheritdoc}
    */
-  public static $modules = array('comment', 'forum', 'taxonomy');
+  protected static $modules = array('comment', 'forum', 'taxonomy');
 
   /**
    * {@inheritdoc}
diff --git a/core/modules/forum/tests/src/Kernel/Migrate/d7/MigrateForumSettingsTest.php b/core/modules/forum/tests/src/Kernel/Migrate/d7/MigrateForumSettingsTest.php
index cd1c7fc..891f3ae 100644
--- a/core/modules/forum/tests/src/Kernel/Migrate/d7/MigrateForumSettingsTest.php
+++ b/core/modules/forum/tests/src/Kernel/Migrate/d7/MigrateForumSettingsTest.php
@@ -12,7 +12,7 @@
 class MigrateForumSettingsTest extends MigrateDrupal7TestBase {
 
   // Don't alphabetize these. They're in dependency order.
-  public static $modules = [
+  protected static $modules = [
     'comment',
     'field',
     'filter',
diff --git a/core/modules/hal/tests/src/Kernel/EntityNormalizeTest.php b/core/modules/hal/tests/src/Kernel/EntityNormalizeTest.php
index 88db403..61160f6 100644
--- a/core/modules/hal/tests/src/Kernel/EntityNormalizeTest.php
+++ b/core/modules/hal/tests/src/Kernel/EntityNormalizeTest.php
@@ -24,7 +24,7 @@ class EntityNormalizeTest extends NormalizerTestBase {
    *
    * @var array
    */
-  public static $modules = array('node', 'taxonomy', 'comment');
+  protected static $modules = array('node', 'taxonomy', 'comment');
 
   /**
    * {@inheritdoc}
diff --git a/core/modules/hal/tests/src/Kernel/EntityTranslationNormalizeTest.php b/core/modules/hal/tests/src/Kernel/EntityTranslationNormalizeTest.php
index 35e038f..39e9798 100644
--- a/core/modules/hal/tests/src/Kernel/EntityTranslationNormalizeTest.php
+++ b/core/modules/hal/tests/src/Kernel/EntityTranslationNormalizeTest.php
@@ -18,7 +18,7 @@ class EntityTranslationNormalizeTest extends NormalizerTestBase {
    *
    * @var array
    */
-  public static $modules = array('node', 'content_translation');
+  protected static $modules = array('node', 'content_translation');
 
   /**
    * {@inheritdoc}
diff --git a/core/modules/hal/tests/src/Kernel/FileNormalizeTest.php b/core/modules/hal/tests/src/Kernel/FileNormalizeTest.php
index 42d7a36..ad73a92 100644
--- a/core/modules/hal/tests/src/Kernel/FileNormalizeTest.php
+++ b/core/modules/hal/tests/src/Kernel/FileNormalizeTest.php
@@ -25,7 +25,7 @@ class FileNormalizeTest extends NormalizerTestBase {
    *
    * @var array
    */
-  public static $modules = array('file');
+  protected static $modules = array('file');
 
   /**
    * {@inheritdoc}
diff --git a/core/modules/hal/tests/src/Kernel/NormalizerTestBase.php b/core/modules/hal/tests/src/Kernel/NormalizerTestBase.php
index 5867476..bbf9bc8 100644
--- a/core/modules/hal/tests/src/Kernel/NormalizerTestBase.php
+++ b/core/modules/hal/tests/src/Kernel/NormalizerTestBase.php
@@ -30,7 +30,7 @@
    *
    * @var array
    */
-  public static $modules = ['entity_test', 'field', 'hal', 'language', 'rest', 'serialization', 'system', 'text', 'user', 'filter'];
+  protected static $modules = ['entity_test', 'field', 'hal', 'language', 'rest', 'serialization', 'system', 'text', 'user', 'filter'];
 
   /**
    * The mock serializer.
diff --git a/core/modules/help/tests/src/Functional/ExperimentalHelpTest.php b/core/modules/help/tests/src/Functional/ExperimentalHelpTest.php
index 9d1a74e..eca0c06 100644
--- a/core/modules/help/tests/src/Functional/ExperimentalHelpTest.php
+++ b/core/modules/help/tests/src/Functional/ExperimentalHelpTest.php
@@ -19,7 +19,7 @@ class ExperimentalHelpTest extends BrowserTestBase {
    *
    * @var array
    */
-  public static $modules = array('help', 'experimental_module_test', 'help_page_test');
+  protected static $modules = array('help', 'experimental_module_test', 'help_page_test');
 
   /**
    * The admin user.
diff --git a/core/modules/help/tests/src/Functional/HelpBlockTest.php b/core/modules/help/tests/src/Functional/HelpBlockTest.php
index 81c4fc1..0354dc6 100644
--- a/core/modules/help/tests/src/Functional/HelpBlockTest.php
+++ b/core/modules/help/tests/src/Functional/HelpBlockTest.php
@@ -14,7 +14,7 @@ class HelpBlockTest extends BrowserTestBase {
   /**
    * {@inheritdoc}
    */
-  public static $modules = ['help', 'help_page_test', 'block', 'more_help_page_test'];
+  protected static $modules = ['help', 'help_page_test', 'block', 'more_help_page_test'];
 
   /**
    * The help block instance.
diff --git a/core/modules/help/tests/src/Functional/HelpTest.php b/core/modules/help/tests/src/Functional/HelpTest.php
index 2e82499..fcbc423 100644
--- a/core/modules/help/tests/src/Functional/HelpTest.php
+++ b/core/modules/help/tests/src/Functional/HelpTest.php
@@ -20,7 +20,7 @@ class HelpTest extends BrowserTestBase {
    *
    * @var array.
    */
-  public static $modules = array('help_test', 'help_page_test');
+  protected static $modules = array('help_test', 'help_page_test');
 
   /**
    * Use the Standard profile to test help implementations of many core modules.
diff --git a/core/modules/help/tests/src/Functional/NoHelpTest.php b/core/modules/help/tests/src/Functional/NoHelpTest.php
index 49c768d..42323fd 100644
--- a/core/modules/help/tests/src/Functional/NoHelpTest.php
+++ b/core/modules/help/tests/src/Functional/NoHelpTest.php
@@ -18,7 +18,7 @@ class NoHelpTest extends BrowserTestBase {
    *
    * @var array.
    */
-  public static $modules = array('help', 'menu_test');
+  protected static $modules = array('help', 'menu_test');
 
   /**
    * The user who will be created.
diff --git a/core/modules/help/tests/src/Kernel/HelpEmptyPageTest.php b/core/modules/help/tests/src/Kernel/HelpEmptyPageTest.php
index 070a954..542100e 100644
--- a/core/modules/help/tests/src/Kernel/HelpEmptyPageTest.php
+++ b/core/modules/help/tests/src/Kernel/HelpEmptyPageTest.php
@@ -17,7 +17,7 @@ class HelpEmptyPageTest extends KernelTestBase {
   /**
    * {@inheritdoc}
    */
-  public static $modules = ['system', 'help_test', 'user'];
+  protected static $modules = ['system', 'help_test', 'user'];
 
   /**
    * {@inheritdoc}
diff --git a/core/modules/image/tests/src/Kernel/ImageFormatterTest.php b/core/modules/image/tests/src/Kernel/ImageFormatterTest.php
index d1b132e..d351373 100644
--- a/core/modules/image/tests/src/Kernel/ImageFormatterTest.php
+++ b/core/modules/image/tests/src/Kernel/ImageFormatterTest.php
@@ -21,7 +21,7 @@ class ImageFormatterTest extends FieldKernelTestBase {
    *
    * @var array
    */
-  public static $modules = array('file', 'image');
+  protected static $modules = array('file', 'image');
 
   /**
    * @var string
diff --git a/core/modules/image/tests/src/Kernel/ImageImportTest.php b/core/modules/image/tests/src/Kernel/ImageImportTest.php
index 14eeaa3..6ee7fa4 100644
--- a/core/modules/image/tests/src/Kernel/ImageImportTest.php
+++ b/core/modules/image/tests/src/Kernel/ImageImportTest.php
@@ -15,7 +15,7 @@ class ImageImportTest extends KernelTestBase {
   /**
    * {@inheritdoc}
    */
-  public static $modules = ['system', 'image', 'image_module_test'];
+  protected static $modules = ['system', 'image', 'image_module_test'];
 
   /**
    * Tests importing image styles.
diff --git a/core/modules/image/tests/src/Kernel/ImageItemTest.php b/core/modules/image/tests/src/Kernel/ImageItemTest.php
index dea4534..954af1b 100644
--- a/core/modules/image/tests/src/Kernel/ImageItemTest.php
+++ b/core/modules/image/tests/src/Kernel/ImageItemTest.php
@@ -23,7 +23,7 @@ class ImageItemTest extends FieldKernelTestBase {
    *
    * @var array
    */
-  public static $modules = array('file', 'image');
+  protected static $modules = array('file', 'image');
 
   /**
    * Created file entity.
diff --git a/core/modules/image/tests/src/Kernel/ImageStyleCustomStreamWrappersTest.php b/core/modules/image/tests/src/Kernel/ImageStyleCustomStreamWrappersTest.php
index 6a45a98..89a82c4 100644
--- a/core/modules/image/tests/src/Kernel/ImageStyleCustomStreamWrappersTest.php
+++ b/core/modules/image/tests/src/Kernel/ImageStyleCustomStreamWrappersTest.php
@@ -23,7 +23,7 @@ class ImageStyleCustomStreamWrappersTest extends KernelTestBase {
    *
    * @var string[]
    */
-  public static $modules = ['system', 'image'];
+  protected static $modules = ['system', 'image'];
 
   /**
    * A testing image style entity.
diff --git a/core/modules/image/tests/src/Kernel/ImageStyleIntegrationTest.php b/core/modules/image/tests/src/Kernel/ImageStyleIntegrationTest.php
index e471c99..09c9247 100644
--- a/core/modules/image/tests/src/Kernel/ImageStyleIntegrationTest.php
+++ b/core/modules/image/tests/src/Kernel/ImageStyleIntegrationTest.php
@@ -20,7 +20,7 @@ class ImageStyleIntegrationTest extends KernelTestBase {
   /**
    * {@inheritdoc}
    */
-  public static $modules = ['image', 'file', 'field', 'system', 'user', 'node'];
+  protected static $modules = ['image', 'file', 'field', 'system', 'user', 'node'];
 
   /**
    * Tests the dependency between ImageStyle and entity display components.
diff --git a/core/modules/image/tests/src/Kernel/Migrate/d7/MigrateImageSettingsTest.php b/core/modules/image/tests/src/Kernel/Migrate/d7/MigrateImageSettingsTest.php
index b95f0a2..bb8ee2c 100644
--- a/core/modules/image/tests/src/Kernel/Migrate/d7/MigrateImageSettingsTest.php
+++ b/core/modules/image/tests/src/Kernel/Migrate/d7/MigrateImageSettingsTest.php
@@ -11,7 +11,7 @@
  */
 class MigrateImageSettingsTest extends MigrateDrupal7TestBase {
 
-  public static $modules = ['image'];
+  protected static $modules = ['image'];
 
   /**
    * {@inheritdoc}
diff --git a/core/modules/image/tests/src/Kernel/Migrate/d7/MigrateImageStylesTest.php b/core/modules/image/tests/src/Kernel/Migrate/d7/MigrateImageStylesTest.php
index 0903218..7585d2c 100644
--- a/core/modules/image/tests/src/Kernel/Migrate/d7/MigrateImageStylesTest.php
+++ b/core/modules/image/tests/src/Kernel/Migrate/d7/MigrateImageStylesTest.php
@@ -17,7 +17,7 @@ class MigrateImageStylesTest extends MigrateDrupal7TestBase {
   /**
    * {@inheritdoc}
    */
-  public static $modules = array('image');
+  protected static $modules = array('image');
 
   /**
    * {@inheritdoc}
diff --git a/core/modules/image/tests/src/Kernel/Plugin/migrate/source/d6/ImageCachePresetTest.php b/core/modules/image/tests/src/Kernel/Plugin/migrate/source/d6/ImageCachePresetTest.php
index edd2ad3..37abd1c 100644
--- a/core/modules/image/tests/src/Kernel/Plugin/migrate/source/d6/ImageCachePresetTest.php
+++ b/core/modules/image/tests/src/Kernel/Plugin/migrate/source/d6/ImageCachePresetTest.php
@@ -16,7 +16,7 @@ class ImageCachePresetTest extends MigrateSqlSourceTestBase {
   /**
    * {@inheritdoc}
    */
-  public static $modules = ['image', 'migrate_drupal'];
+  protected static $modules = ['image', 'migrate_drupal'];
 
   /**
    * {@inheritdoc}
diff --git a/core/modules/image/tests/src/Kernel/Plugin/migrate/source/d7/ImageStylesTest.php b/core/modules/image/tests/src/Kernel/Plugin/migrate/source/d7/ImageStylesTest.php
index bb91de8..86b4385 100644
--- a/core/modules/image/tests/src/Kernel/Plugin/migrate/source/d7/ImageStylesTest.php
+++ b/core/modules/image/tests/src/Kernel/Plugin/migrate/source/d7/ImageStylesTest.php
@@ -16,7 +16,7 @@ class ImageStylesTest extends MigrateSqlSourceTestBase {
   /**
    * {@inheritdoc}
    */
-  public static $modules = ['image', 'migrate_drupal'];
+  protected static $modules = ['image', 'migrate_drupal'];
 
   /**
    * {@inheritdoc}
diff --git a/core/modules/image/tests/src/Kernel/Views/ImageViewsDataTest.php b/core/modules/image/tests/src/Kernel/Views/ImageViewsDataTest.php
index c2f8fd8..cee0552 100644
--- a/core/modules/image/tests/src/Kernel/Views/ImageViewsDataTest.php
+++ b/core/modules/image/tests/src/Kernel/Views/ImageViewsDataTest.php
@@ -19,7 +19,7 @@ class ImageViewsDataTest extends ViewsKernelTestBase {
    *
    * @var array
    */
-  public static $modules = array('image', 'file', 'views', 'entity_test', 'user', 'field');
+  protected static $modules = array('image', 'file', 'views', 'entity_test', 'user', 'field');
 
   /**
    * Tests views data generated for image field relationship.
diff --git a/core/modules/language/tests/src/Kernel/Condition/LanguageConditionTest.php b/core/modules/language/tests/src/Kernel/Condition/LanguageConditionTest.php
index 92b2a04..f28867b 100644
--- a/core/modules/language/tests/src/Kernel/Condition/LanguageConditionTest.php
+++ b/core/modules/language/tests/src/Kernel/Condition/LanguageConditionTest.php
@@ -32,7 +32,7 @@ class LanguageConditionTest extends KernelTestBase {
    *
    * @var array
    */
-  public static $modules = array('system', 'language');
+  protected static $modules = array('system', 'language');
 
   protected function setUp() {
     parent::setUp();
diff --git a/core/modules/language/tests/src/Kernel/ConfigurableLanguageTest.php b/core/modules/language/tests/src/Kernel/ConfigurableLanguageTest.php
index a87a6e3..ea5b2dc 100644
--- a/core/modules/language/tests/src/Kernel/ConfigurableLanguageTest.php
+++ b/core/modules/language/tests/src/Kernel/ConfigurableLanguageTest.php
@@ -18,7 +18,7 @@ class ConfigurableLanguageTest extends KernelTestBase {
    *
    * @var array
    */
-  public static $modules = array('language');
+  protected static $modules = array('language');
 
   /**
    * Tests configurable language name methods.
diff --git a/core/modules/language/tests/src/Kernel/EntityDefaultLanguageTest.php b/core/modules/language/tests/src/Kernel/EntityDefaultLanguageTest.php
index 84368b7..d654b3b 100644
--- a/core/modules/language/tests/src/Kernel/EntityDefaultLanguageTest.php
+++ b/core/modules/language/tests/src/Kernel/EntityDefaultLanguageTest.php
@@ -18,7 +18,7 @@ class EntityDefaultLanguageTest extends KernelTestBase {
    *
    * @var array
    */
-  public static $modules = array('language', 'node', 'field', 'text', 'user', 'system');
+  protected static $modules = array('language', 'node', 'field', 'text', 'user', 'system');
 
   /**
    * {@inheritdoc}
diff --git a/core/modules/language/tests/src/Kernel/EntityUrlLanguageTest.php b/core/modules/language/tests/src/Kernel/EntityUrlLanguageTest.php
index fb62f48..a02334b 100644
--- a/core/modules/language/tests/src/Kernel/EntityUrlLanguageTest.php
+++ b/core/modules/language/tests/src/Kernel/EntityUrlLanguageTest.php
@@ -22,7 +22,7 @@ class EntityUrlLanguageTest extends LanguageTestBase {
    *
    * @var array
    */
-  public static $modules = ['entity_test', 'user'];
+  protected static $modules = ['entity_test', 'user'];
 
   /**
    * The entity being used for testing.
diff --git a/core/modules/language/tests/src/Kernel/LanguageConfigFactoryOverrideTest.php b/core/modules/language/tests/src/Kernel/LanguageConfigFactoryOverrideTest.php
index b8b31a9..8a894c3 100644
--- a/core/modules/language/tests/src/Kernel/LanguageConfigFactoryOverrideTest.php
+++ b/core/modules/language/tests/src/Kernel/LanguageConfigFactoryOverrideTest.php
@@ -17,7 +17,7 @@ class LanguageConfigFactoryOverrideTest extends KernelTestBase {
    *
    * @var array
    */
-  public static $modules = array('system', 'language');
+  protected static $modules = array('system', 'language');
 
   /**
    * Tests language.config_factory_override service has the default language.
diff --git a/core/modules/language/tests/src/Kernel/LanguageConfigOverrideInstallTest.php b/core/modules/language/tests/src/Kernel/LanguageConfigOverrideInstallTest.php
index c01187c..e6c0dc4 100644
--- a/core/modules/language/tests/src/Kernel/LanguageConfigOverrideInstallTest.php
+++ b/core/modules/language/tests/src/Kernel/LanguageConfigOverrideInstallTest.php
@@ -17,7 +17,7 @@ class LanguageConfigOverrideInstallTest extends KernelTestBase {
    *
    * @var array
    */
-  public static $modules = array('language', 'config_events_test');
+  protected static $modules = array('language', 'config_events_test');
 
   /**
    * Tests the configuration events are not fired during install of overrides.
diff --git a/core/modules/language/tests/src/Kernel/LanguageTestBase.php b/core/modules/language/tests/src/Kernel/LanguageTestBase.php
index eb4f0ef..f7392a1 100644
--- a/core/modules/language/tests/src/Kernel/LanguageTestBase.php
+++ b/core/modules/language/tests/src/Kernel/LanguageTestBase.php
@@ -9,7 +9,7 @@
  */
 abstract class LanguageTestBase extends KernelTestBase {
 
-  public static $modules = array('system', 'language', 'language_test');
+  protected static $modules = array('system', 'language', 'language_test');
   /**
    * The language manager.
    *
diff --git a/core/modules/language/tests/src/Kernel/Migrate/d6/MigrateDefaultLanguageTest.php b/core/modules/language/tests/src/Kernel/Migrate/d6/MigrateDefaultLanguageTest.php
index 645af29..a006f1c 100644
--- a/core/modules/language/tests/src/Kernel/Migrate/d6/MigrateDefaultLanguageTest.php
+++ b/core/modules/language/tests/src/Kernel/Migrate/d6/MigrateDefaultLanguageTest.php
@@ -17,7 +17,7 @@ class MigrateDefaultLanguageTest extends MigrateDrupal6TestBase {
   /**
    * {@inheritdoc}
    */
-  public static $modules = ['language'];
+  protected static $modules = ['language'];
 
   /**
    * Tests language_default migration with an existing language.
diff --git a/core/modules/language/tests/src/Kernel/Migrate/d6/MigrateLanguageContentSettingsTest.php b/core/modules/language/tests/src/Kernel/Migrate/d6/MigrateLanguageContentSettingsTest.php
index 0420d70..40c14f0 100644
--- a/core/modules/language/tests/src/Kernel/Migrate/d6/MigrateLanguageContentSettingsTest.php
+++ b/core/modules/language/tests/src/Kernel/Migrate/d6/MigrateLanguageContentSettingsTest.php
@@ -16,7 +16,7 @@ class MigrateLanguageContentSettingsTest extends MigrateDrupal6TestBase {
   /**
    * {@inheritdoc}
    */
-  public static $modules = ['node', 'text', 'language', 'content_translation'];
+  protected static $modules = ['node', 'text', 'language', 'content_translation'];
 
   /**
    * {@inheritdoc}
diff --git a/core/modules/language/tests/src/Kernel/Migrate/d7/MigrateDefaultLanguageTest.php b/core/modules/language/tests/src/Kernel/Migrate/d7/MigrateDefaultLanguageTest.php
index 79769bc..c9a0cde 100644
--- a/core/modules/language/tests/src/Kernel/Migrate/d7/MigrateDefaultLanguageTest.php
+++ b/core/modules/language/tests/src/Kernel/Migrate/d7/MigrateDefaultLanguageTest.php
@@ -17,7 +17,7 @@ class MigrateDefaultLanguageTest extends MigrateDrupal7TestBase {
   /**
    * {@inheritdoc}
    */
-  public static $modules = ['language'];
+  protected static $modules = ['language'];
 
   /**
    * Tests language_default migration with a non-existing language.
diff --git a/core/modules/language/tests/src/Kernel/Migrate/d7/MigrateLanguageContentSettingsTest.php b/core/modules/language/tests/src/Kernel/Migrate/d7/MigrateLanguageContentSettingsTest.php
index defc6cd..336dc76 100644
--- a/core/modules/language/tests/src/Kernel/Migrate/d7/MigrateLanguageContentSettingsTest.php
+++ b/core/modules/language/tests/src/Kernel/Migrate/d7/MigrateLanguageContentSettingsTest.php
@@ -16,7 +16,7 @@ class MigrateLanguageContentSettingsTest extends MigrateDrupal7TestBase {
   /**
    * {@inheritdoc}
    */
-  public static $modules = ['node', 'text', 'language', 'content_translation'];
+  protected static $modules = ['node', 'text', 'language', 'content_translation'];
   /**
    * {@inheritdoc}
    */
diff --git a/core/modules/language/tests/src/Kernel/Migrate/d7/MigrateLanguageNegotiationSettingsTest.php b/core/modules/language/tests/src/Kernel/Migrate/d7/MigrateLanguageNegotiationSettingsTest.php
index f9ac1c8..5f2152c 100644
--- a/core/modules/language/tests/src/Kernel/Migrate/d7/MigrateLanguageNegotiationSettingsTest.php
+++ b/core/modules/language/tests/src/Kernel/Migrate/d7/MigrateLanguageNegotiationSettingsTest.php
@@ -16,7 +16,7 @@ class MigrateLanguageNegotiationSettingsTest extends MigrateDrupal7TestBase {
    *
    * @var array
    */
-  public static $modules = ['language'];
+  protected static $modules = ['language'];
 
   /**
    * {@inheritdoc}
diff --git a/core/modules/language/tests/src/Kernel/Views/LanguageTestBase.php b/core/modules/language/tests/src/Kernel/Views/LanguageTestBase.php
index cb5d473..2878459 100644
--- a/core/modules/language/tests/src/Kernel/Views/LanguageTestBase.php
+++ b/core/modules/language/tests/src/Kernel/Views/LanguageTestBase.php
@@ -15,7 +15,7 @@
    *
    * @var array
    */
-  public static $modules = array('system', 'language');
+  protected static $modules = array('system', 'language');
 
   protected function setUp($import_test_views = TRUE) {
     parent::setUp();
diff --git a/core/modules/link/tests/src/Kernel/LinkItemTest.php b/core/modules/link/tests/src/Kernel/LinkItemTest.php
index 5e2c45d..f62ff7e 100644
--- a/core/modules/link/tests/src/Kernel/LinkItemTest.php
+++ b/core/modules/link/tests/src/Kernel/LinkItemTest.php
@@ -24,7 +24,7 @@ class LinkItemTest extends FieldKernelTestBase {
    *
    * @var array
    */
-  public static $modules = array('link');
+  protected static $modules = array('link');
 
   protected function setUp() {
     parent::setUp();
diff --git a/core/modules/locale/tests/src/Kernel/LocaleConfigManagerTest.php b/core/modules/locale/tests/src/Kernel/LocaleConfigManagerTest.php
index c1ce1b7..3369a56 100644
--- a/core/modules/locale/tests/src/Kernel/LocaleConfigManagerTest.php
+++ b/core/modules/locale/tests/src/Kernel/LocaleConfigManagerTest.php
@@ -18,7 +18,7 @@ class LocaleConfigManagerTest extends KernelTestBase {
    *
    * @var array
    */
-  public static $modules = array('system', 'language', 'locale', 'locale_test', 'block');
+  protected static $modules = array('system', 'language', 'locale', 'locale_test', 'block');
 
   /**
    * This test creates simple config on the fly breaking schema checking.
diff --git a/core/modules/locale/tests/src/Kernel/LocaleConfigSubscriberTest.php b/core/modules/locale/tests/src/Kernel/LocaleConfigSubscriberTest.php
index 013a9ea..73351b5 100644
--- a/core/modules/locale/tests/src/Kernel/LocaleConfigSubscriberTest.php
+++ b/core/modules/locale/tests/src/Kernel/LocaleConfigSubscriberTest.php
@@ -18,7 +18,7 @@ class LocaleConfigSubscriberTest extends KernelTestBase {
   /**
    * {@inheritdoc}
    */
-  public static $modules = ['language', 'locale', 'system', 'locale_test'];
+  protected static $modules = ['language', 'locale', 'system', 'locale_test'];
 
   /**
    * The configurable language manager used in this test.
diff --git a/core/modules/locale/tests/src/Kernel/LocaleConfigurableLanguageManagerTest.php b/core/modules/locale/tests/src/Kernel/LocaleConfigurableLanguageManagerTest.php
index e88f49c..0fd8cc1 100644
--- a/core/modules/locale/tests/src/Kernel/LocaleConfigurableLanguageManagerTest.php
+++ b/core/modules/locale/tests/src/Kernel/LocaleConfigurableLanguageManagerTest.php
@@ -19,7 +19,7 @@ class LocaleConfigurableLanguageManagerTest extends KernelTestBase {
    *
    * @var array
    */
-  public static $modules = ['language', 'locale'];
+  protected static $modules = ['language', 'locale'];
 
   public function testGetLanguages() {
     $this->installSchema('locale', ['locales_source', 'locales_target', 'locales_location']);
diff --git a/core/modules/locale/tests/src/Kernel/LocaleStringIsSafeTest.php b/core/modules/locale/tests/src/Kernel/LocaleStringIsSafeTest.php
index 4129cdc..5cc4cde 100644
--- a/core/modules/locale/tests/src/Kernel/LocaleStringIsSafeTest.php
+++ b/core/modules/locale/tests/src/Kernel/LocaleStringIsSafeTest.php
@@ -16,7 +16,7 @@ class LocaleStringIsSafeTest extends KernelTestBase {
    *
    * @var array
    */
-  public static $modules = ['locale', 'locale_test'];
+  protected static $modules = ['locale', 'locale_test'];
 
   /**
    * Tests for locale_string_is_safe().
diff --git a/core/modules/locale/tests/src/Kernel/LocaleTranslationProjectsTest.php b/core/modules/locale/tests/src/Kernel/LocaleTranslationProjectsTest.php
index 370c014..054448d 100644
--- a/core/modules/locale/tests/src/Kernel/LocaleTranslationProjectsTest.php
+++ b/core/modules/locale/tests/src/Kernel/LocaleTranslationProjectsTest.php
@@ -14,7 +14,7 @@ class LocaleTranslationProjectsTest extends KernelTestBase {
   /**
    * {@inheritdoc}
    */
-  public static $modules = ['locale', 'locale_test', 'system'];
+  protected static $modules = ['locale', 'locale_test', 'system'];
 
   /**
    * The module handler used in this test.
diff --git a/core/modules/locale/tests/src/Kernel/Migrate/MigrateLocaleConfigsTest.php b/core/modules/locale/tests/src/Kernel/Migrate/MigrateLocaleConfigsTest.php
index df47769..cbb5f1a 100644
--- a/core/modules/locale/tests/src/Kernel/Migrate/MigrateLocaleConfigsTest.php
+++ b/core/modules/locale/tests/src/Kernel/Migrate/MigrateLocaleConfigsTest.php
@@ -17,7 +17,7 @@ class MigrateLocaleConfigsTest extends MigrateDrupal6TestBase {
   /**
    * {@inheritdoc}
    */
-  public static $modules = array('locale', 'language');
+  protected static $modules = array('locale', 'language');
 
   /**
    * {@inheritdoc}
diff --git a/core/modules/menu_link_content/tests/src/Kernel/MenuLinkContentCacheabilityBubblingTest.php b/core/modules/menu_link_content/tests/src/Kernel/MenuLinkContentCacheabilityBubblingTest.php
index c7689d9..e0e0757 100644
--- a/core/modules/menu_link_content/tests/src/Kernel/MenuLinkContentCacheabilityBubblingTest.php
+++ b/core/modules/menu_link_content/tests/src/Kernel/MenuLinkContentCacheabilityBubblingTest.php
@@ -24,7 +24,7 @@ class MenuLinkContentCacheabilityBubblingTest extends KernelTestBase {
   /**
    * {@inheritdoc}
    */
-  public static $modules = ['menu_link_content', 'system', 'link', 'outbound_processing_test', 'url_alter_test', 'user'];
+  protected static $modules = ['menu_link_content', 'system', 'link', 'outbound_processing_test', 'url_alter_test', 'user'];
 
   /**
    * {@inheritdoc}
diff --git a/core/modules/menu_link_content/tests/src/Kernel/MenuLinkContentDeriverTest.php b/core/modules/menu_link_content/tests/src/Kernel/MenuLinkContentDeriverTest.php
index 12d8d35..cbb0ba3 100644
--- a/core/modules/menu_link_content/tests/src/Kernel/MenuLinkContentDeriverTest.php
+++ b/core/modules/menu_link_content/tests/src/Kernel/MenuLinkContentDeriverTest.php
@@ -18,7 +18,7 @@ class MenuLinkContentDeriverTest extends KernelTestBase {
   /**
    * {@inheritdoc}
    */
-  public static $modules = ['menu_link_content', 'link', 'system', 'menu_link_content_dynamic_route'];
+  protected static $modules = ['menu_link_content', 'link', 'system', 'menu_link_content_dynamic_route'];
 
   /**
    * {@inheritdoc}
diff --git a/core/modules/menu_link_content/tests/src/Kernel/Migrate/MigrateMenuLinkContentStubTest.php b/core/modules/menu_link_content/tests/src/Kernel/Migrate/MigrateMenuLinkContentStubTest.php
index 2c348cf..2cad189 100644
--- a/core/modules/menu_link_content/tests/src/Kernel/Migrate/MigrateMenuLinkContentStubTest.php
+++ b/core/modules/menu_link_content/tests/src/Kernel/Migrate/MigrateMenuLinkContentStubTest.php
@@ -17,7 +17,7 @@ class MigrateMenuLinkContentStubTest extends MigrateDrupalTestBase {
   /**
    * {@inheritdoc}
    */
-  public static $modules = ['menu_link_content', 'link'];
+  protected static $modules = ['menu_link_content', 'link'];
 
   /**
    * {@inheritdoc}
diff --git a/core/modules/menu_link_content/tests/src/Kernel/Migrate/d6/MigrateMenuLinkTest.php b/core/modules/menu_link_content/tests/src/Kernel/Migrate/d6/MigrateMenuLinkTest.php
index eea87db..0a08d8a 100644
--- a/core/modules/menu_link_content/tests/src/Kernel/Migrate/d6/MigrateMenuLinkTest.php
+++ b/core/modules/menu_link_content/tests/src/Kernel/Migrate/d6/MigrateMenuLinkTest.php
@@ -15,7 +15,7 @@ class MigrateMenuLinkTest extends MigrateDrupal6TestBase {
   /**
    * {@inheritdoc}
    */
-  public static $modules = array('menu_ui', 'menu_link_content');
+  protected static $modules = array('menu_ui', 'menu_link_content');
 
   /**
    * {@inheritdoc}
diff --git a/core/modules/menu_link_content/tests/src/Kernel/Migrate/d7/MigrateMenuLinkTest.php b/core/modules/menu_link_content/tests/src/Kernel/Migrate/d7/MigrateMenuLinkTest.php
index 0c915d4..adbd7cb 100644
--- a/core/modules/menu_link_content/tests/src/Kernel/Migrate/d7/MigrateMenuLinkTest.php
+++ b/core/modules/menu_link_content/tests/src/Kernel/Migrate/d7/MigrateMenuLinkTest.php
@@ -18,7 +18,7 @@ class MigrateMenuLinkTest extends MigrateDrupal7TestBase {
   /**
    * {@inheritdoc}
    */
-  public static $modules = array('link', 'menu_ui', 'menu_link_content');
+  protected static $modules = array('link', 'menu_ui', 'menu_link_content');
 
   /**
    * {@inheritdoc}
diff --git a/core/modules/menu_link_content/tests/src/Kernel/PathAliasMenuLinkContentTest.php b/core/modules/menu_link_content/tests/src/Kernel/PathAliasMenuLinkContentTest.php
index 046deb4..ff77b1f 100644
--- a/core/modules/menu_link_content/tests/src/Kernel/PathAliasMenuLinkContentTest.php
+++ b/core/modules/menu_link_content/tests/src/Kernel/PathAliasMenuLinkContentTest.php
@@ -18,7 +18,7 @@ class PathAliasMenuLinkContentTest extends KernelTestBase {
   /**
    * {@inheritdoc}
    */
-  public static $modules = ['menu_link_content', 'system', 'link', 'test_page_test'];
+  protected static $modules = ['menu_link_content', 'system', 'link', 'test_page_test'];
 
   /**
    * {@inheritdoc}
diff --git a/core/modules/menu_link_content/tests/src/Kernel/Plugin/migrate/source/MenuLinkTest.php b/core/modules/menu_link_content/tests/src/Kernel/Plugin/migrate/source/MenuLinkTest.php
index db6c547..44cfa2b 100644
--- a/core/modules/menu_link_content/tests/src/Kernel/Plugin/migrate/source/MenuLinkTest.php
+++ b/core/modules/menu_link_content/tests/src/Kernel/Plugin/migrate/source/MenuLinkTest.php
@@ -17,7 +17,7 @@ class MenuLinkTest extends MigrateSqlSourceTestBase {
   /**
    * {@inheritdoc}
    */
-  public static $modules = ['menu_link_content', 'migrate_drupal'];
+  protected static $modules = ['menu_link_content', 'migrate_drupal'];
 
   /**
    * {@inheritdoc}
diff --git a/core/modules/menu_ui/tests/tests/src/Kernel/Migrate/MigrateMenuSettingsTest.php b/core/modules/menu_ui/tests/tests/src/Kernel/Migrate/MigrateMenuSettingsTest.php
index f87bc5f..a311160 100644
--- a/core/modules/menu_ui/tests/tests/src/Kernel/Migrate/MigrateMenuSettingsTest.php
+++ b/core/modules/menu_ui/tests/tests/src/Kernel/Migrate/MigrateMenuSettingsTest.php
@@ -11,7 +11,7 @@
  */
 class MigrateMenuSettingsTest extends MigrateDrupal7TestBase {
 
-  public static $modules = ['menu_ui'];
+  protected static $modules = ['menu_ui'];
 
   /**
    * {@inheritdoc}
diff --git a/core/modules/migrate/tests/src/Kernel/HighWaterTest.php b/core/modules/migrate/tests/src/Kernel/HighWaterTest.php
index 0b6d368..ffe239c 100644
--- a/core/modules/migrate/tests/src/Kernel/HighWaterTest.php
+++ b/core/modules/migrate/tests/src/Kernel/HighWaterTest.php
@@ -12,7 +12,7 @@ class HighWaterTest extends MigrateTestBase {
   /**
    * {@inheritdoc}
    */
-  public static $modules = [
+  protected static $modules = [
     'system',
     'user',
     'node',
diff --git a/core/modules/migrate/tests/src/Kernel/MigrateBundleTest.php b/core/modules/migrate/tests/src/Kernel/MigrateBundleTest.php
index 7463295..f66098c 100644
--- a/core/modules/migrate/tests/src/Kernel/MigrateBundleTest.php
+++ b/core/modules/migrate/tests/src/Kernel/MigrateBundleTest.php
@@ -18,7 +18,7 @@ class MigrateBundleTest extends MigrateTestBase {
    *
    * @var array
    */
-  public static $modules = ['taxonomy', 'text'];
+  protected static $modules = ['taxonomy', 'text'];
 
   /**
    * {@inheritdoc}
diff --git a/core/modules/migrate/tests/src/Kernel/MigrateEmbeddedDataTest.php b/core/modules/migrate/tests/src/Kernel/MigrateEmbeddedDataTest.php
index 019ac42..0f02bcd 100644
--- a/core/modules/migrate/tests/src/Kernel/MigrateEmbeddedDataTest.php
+++ b/core/modules/migrate/tests/src/Kernel/MigrateEmbeddedDataTest.php
@@ -16,7 +16,7 @@ class MigrateEmbeddedDataTest extends KernelTestBase {
    *
    * @var array
    */
-  public static $modules = ['migrate'];
+  protected static $modules = ['migrate'];
 
   /**
    * Tests the embedded_data source plugin.
diff --git a/core/modules/migrate/tests/src/Kernel/MigrateEntityContentBaseTest.php b/core/modules/migrate/tests/src/Kernel/MigrateEntityContentBaseTest.php
index 0ebc719..85141cb 100644
--- a/core/modules/migrate/tests/src/Kernel/MigrateEntityContentBaseTest.php
+++ b/core/modules/migrate/tests/src/Kernel/MigrateEntityContentBaseTest.php
@@ -23,7 +23,7 @@ class MigrateEntityContentBaseTest extends KernelTestBase {
    *
    * @var array
    */
-  public static $modules = ['migrate', 'user', 'language', 'entity_test'];
+  protected static $modules = ['migrate', 'user', 'language', 'entity_test'];
 
   /**
    * The storage for entity_test_mul.
diff --git a/core/modules/migrate/tests/src/Kernel/MigrateEventsTest.php b/core/modules/migrate/tests/src/Kernel/MigrateEventsTest.php
index b332cbd..e1c0aaf 100644
--- a/core/modules/migrate/tests/src/Kernel/MigrateEventsTest.php
+++ b/core/modules/migrate/tests/src/Kernel/MigrateEventsTest.php
@@ -31,7 +31,7 @@ class MigrateEventsTest extends KernelTestBase {
    *
    * @var array
    */
-  public static $modules = ['migrate', 'migrate_events_test'];
+  protected static $modules = ['migrate', 'migrate_events_test'];
 
   /**
    * {@inheritdoc}
diff --git a/core/modules/migrate/tests/src/Kernel/MigrateExternalTranslatedTest.php b/core/modules/migrate/tests/src/Kernel/MigrateExternalTranslatedTest.php
index ce9c013..c9dc45c 100644
--- a/core/modules/migrate/tests/src/Kernel/MigrateExternalTranslatedTest.php
+++ b/core/modules/migrate/tests/src/Kernel/MigrateExternalTranslatedTest.php
@@ -22,7 +22,7 @@ class MigrateExternalTranslatedTest extends MigrateTestBase {
    * @todo: Remove migrate_drupal when https://www.drupal.org/node/2560795 is
    * fixed.
    */
-  public static $modules = ['system', 'user', 'language', 'node', 'field', 'migrate_drupal', 'migrate_external_translated_test'];
+  protected static $modules = ['system', 'user', 'language', 'node', 'field', 'migrate_drupal', 'migrate_external_translated_test'];
 
   /**
    * {@inheritdoc}
diff --git a/core/modules/migrate/tests/src/Kernel/MigrateInterruptionTest.php b/core/modules/migrate/tests/src/Kernel/MigrateInterruptionTest.php
index 9ff76f6..24c0c15 100644
--- a/core/modules/migrate/tests/src/Kernel/MigrateInterruptionTest.php
+++ b/core/modules/migrate/tests/src/Kernel/MigrateInterruptionTest.php
@@ -21,7 +21,7 @@ class MigrateInterruptionTest extends KernelTestBase {
    *
    * @var array
    */
-  public static $modules = ['migrate', 'migrate_events_test'];
+  protected static $modules = ['migrate', 'migrate_events_test'];
 
   /**
    * {@inheritdoc}
diff --git a/core/modules/migrate/tests/src/Kernel/MigrateMessageTest.php b/core/modules/migrate/tests/src/Kernel/MigrateMessageTest.php
index 4f4af7d..ed759a4 100644
--- a/core/modules/migrate/tests/src/Kernel/MigrateMessageTest.php
+++ b/core/modules/migrate/tests/src/Kernel/MigrateMessageTest.php
@@ -21,7 +21,7 @@ class MigrateMessageTest extends KernelTestBase implements MigrateMessageInterfa
    *
    * @var array
    */
-  public static $modules = ['migrate', 'system'];
+  protected static $modules = ['migrate', 'system'];
 
   /**
    * Migration to run.
diff --git a/core/modules/migrate/tests/src/Kernel/MigrateRollbackTest.php b/core/modules/migrate/tests/src/Kernel/MigrateRollbackTest.php
index 4b78e65..668f5d8 100644
--- a/core/modules/migrate/tests/src/Kernel/MigrateRollbackTest.php
+++ b/core/modules/migrate/tests/src/Kernel/MigrateRollbackTest.php
@@ -20,7 +20,7 @@ class MigrateRollbackTest extends MigrateTestBase {
    *
    * @var array
    */
-  public static $modules = ['field', 'taxonomy', 'text'];
+  protected static $modules = ['field', 'taxonomy', 'text'];
 
   /**
    * {@inheritdoc}
diff --git a/core/modules/migrate/tests/src/Kernel/MigrateSkipRowTest.php b/core/modules/migrate/tests/src/Kernel/MigrateSkipRowTest.php
index 3b0091d..deba663 100644
--- a/core/modules/migrate/tests/src/Kernel/MigrateSkipRowTest.php
+++ b/core/modules/migrate/tests/src/Kernel/MigrateSkipRowTest.php
@@ -20,7 +20,7 @@ class MigrateSkipRowTest extends KernelTestBase {
    *
    * @var array
    */
-  public static $modules = ['migrate', 'migrate_prepare_row_test'];
+  protected static $modules = ['migrate', 'migrate_prepare_row_test'];
 
   /**
    * Tests migration interruptions.
diff --git a/core/modules/migrate/tests/src/Kernel/MigrateSourceTestBase.php b/core/modules/migrate/tests/src/Kernel/MigrateSourceTestBase.php
index e3b2f8c..6a1fbec 100644
--- a/core/modules/migrate/tests/src/Kernel/MigrateSourceTestBase.php
+++ b/core/modules/migrate/tests/src/Kernel/MigrateSourceTestBase.php
@@ -15,7 +15,7 @@
   /**
    * {@inheritdoc}
    */
-  public static $modules = ['migrate'];
+  protected static $modules = ['migrate'];
 
   /**
    * The mocked migration.
diff --git a/core/modules/migrate/tests/src/Kernel/MigrateTestBase.php b/core/modules/migrate/tests/src/Kernel/MigrateTestBase.php
index 8494dc6..e7ef892 100644
--- a/core/modules/migrate/tests/src/Kernel/MigrateTestBase.php
+++ b/core/modules/migrate/tests/src/Kernel/MigrateTestBase.php
@@ -47,7 +47,7 @@
    */
   protected $sourceDatabase;
 
-  public static $modules = array('migrate');
+  protected static $modules = array('migrate');
 
   /**
    * {@inheritdoc}
diff --git a/core/modules/migrate/tests/src/Kernel/MigrationTest.php b/core/modules/migrate/tests/src/Kernel/MigrationTest.php
index 5fe56ec..72b5b24 100644
--- a/core/modules/migrate/tests/src/Kernel/MigrationTest.php
+++ b/core/modules/migrate/tests/src/Kernel/MigrationTest.php
@@ -18,7 +18,7 @@ class MigrationTest extends KernelTestBase {
    *
    * @var array
    */
-  public static $modules = ['migrate', 'field'];
+  protected static $modules = ['migrate', 'field'];
 
   /**
    * Tests Migration::set().
diff --git a/core/modules/migrate/tests/src/Kernel/Plugin/MigrationPluginConfigurationTest.php b/core/modules/migrate/tests/src/Kernel/Plugin/MigrationPluginConfigurationTest.php
index 827af91..0f789bb 100644
--- a/core/modules/migrate/tests/src/Kernel/Plugin/MigrationPluginConfigurationTest.php
+++ b/core/modules/migrate/tests/src/Kernel/Plugin/MigrationPluginConfigurationTest.php
@@ -15,7 +15,7 @@ class MigrationPluginConfigurationTest extends KernelTestBase {
   /**
    * {@inheritdoc}
    */
-  public static $modules = [
+  protected static $modules = [
     'migrate',
     'migrate_drupal',
     // Test with a simple migration.
diff --git a/core/modules/migrate/tests/src/Kernel/Plugin/MigrationPluginListTest.php b/core/modules/migrate/tests/src/Kernel/Plugin/MigrationPluginListTest.php
index f732d9f..0217a29 100644
--- a/core/modules/migrate/tests/src/Kernel/Plugin/MigrationPluginListTest.php
+++ b/core/modules/migrate/tests/src/Kernel/Plugin/MigrationPluginListTest.php
@@ -16,7 +16,7 @@ class MigrationPluginListTest extends KernelTestBase {
   /**
    * {@inheritdoc}
    */
-  public static $modules = [
+  protected static $modules = [
     'migrate',
     // Test with all modules containing Drupal migrations.
     'action',
diff --git a/core/modules/migrate/tests/src/Kernel/Plugin/MigrationTest.php b/core/modules/migrate/tests/src/Kernel/Plugin/MigrationTest.php
index 0af1445..19f98e4 100644
--- a/core/modules/migrate/tests/src/Kernel/Plugin/MigrationTest.php
+++ b/core/modules/migrate/tests/src/Kernel/Plugin/MigrationTest.php
@@ -15,7 +15,7 @@ class MigrationTest extends KernelTestBase {
   /**
    * {@inheritdoc}
    */
-  public static $modules = ['migrate'];
+  protected static $modules = ['migrate'];
 
   /**
    * Tests Migration::getProcessPlugins()
diff --git a/core/modules/migrate/tests/src/Kernel/process/CopyFileTest.php b/core/modules/migrate/tests/src/Kernel/process/CopyFileTest.php
index 427d413..4accb81 100644
--- a/core/modules/migrate/tests/src/Kernel/process/CopyFileTest.php
+++ b/core/modules/migrate/tests/src/Kernel/process/CopyFileTest.php
@@ -18,7 +18,7 @@ class CopyFileTest extends FileTestBase {
   /**
    * {@inheritdoc}
    */
-  public static $modules = ['migrate', 'system'];
+  protected static $modules = ['migrate', 'system'];
 
   /**
    * The file system service.
diff --git a/core/modules/migrate/tests/src/Kernel/process/DownloadTest.php b/core/modules/migrate/tests/src/Kernel/process/DownloadTest.php
index 69e3aa0..575fede 100644
--- a/core/modules/migrate/tests/src/Kernel/process/DownloadTest.php
+++ b/core/modules/migrate/tests/src/Kernel/process/DownloadTest.php
@@ -21,7 +21,7 @@ class DownloadTest extends FileTestBase {
   /**
    * {@inheritdoc}
    */
-  public static $modules = ['system'];
+  protected static $modules = ['system'];
 
   /**
    * {@inheritdoc}
diff --git a/core/modules/migrate/tests/src/Kernel/process/ExtractTest.php b/core/modules/migrate/tests/src/Kernel/process/ExtractTest.php
index 8c747ab..d26cc6b 100644
--- a/core/modules/migrate/tests/src/Kernel/process/ExtractTest.php
+++ b/core/modules/migrate/tests/src/Kernel/process/ExtractTest.php
@@ -17,7 +17,7 @@ class ExtractTest extends KernelTestBase {
   /**
    * {@inheritdoc}
    */
-  public static $modules = ['migrate'];
+  protected static $modules = ['migrate'];
 
   /**
    * Returns test migration definition.
diff --git a/core/modules/migrate/tests/src/Kernel/process/FileCopyTest.php b/core/modules/migrate/tests/src/Kernel/process/FileCopyTest.php
index ee75e45..d6aa3ee 100644
--- a/core/modules/migrate/tests/src/Kernel/process/FileCopyTest.php
+++ b/core/modules/migrate/tests/src/Kernel/process/FileCopyTest.php
@@ -19,7 +19,7 @@ class FileCopyTest extends FileTestBase {
   /**
    * {@inheritdoc}
    */
-  public static $modules = ['migrate', 'system'];
+  protected static $modules = ['migrate', 'system'];
 
   /**
    * The file system service.
diff --git a/core/modules/migrate_drupal/tests/src/Kernel/MigrateCckFieldPluginManagerTest.php b/core/modules/migrate_drupal/tests/src/Kernel/MigrateCckFieldPluginManagerTest.php
index 1754cfe..2ac4456 100644
--- a/core/modules/migrate_drupal/tests/src/Kernel/MigrateCckFieldPluginManagerTest.php
+++ b/core/modules/migrate_drupal/tests/src/Kernel/MigrateCckFieldPluginManagerTest.php
@@ -14,7 +14,7 @@ class MigrateCckFieldPluginManagerTest extends MigrateDrupalTestBase {
   /**
    * {@inheritdoc}
    */
-  public static $modules = array('system', 'user', 'field', 'migrate_drupal', 'options', 'file', 'text', 'migrate_cckfield_plugin_manager_test');
+  protected static $modules = array('system', 'user', 'field', 'migrate_drupal', 'options', 'file', 'text', 'migrate_cckfield_plugin_manager_test');
 
   /**
    * Tests that the correct MigrateCckField plugins are used.
diff --git a/core/modules/migrate_drupal/tests/src/Kernel/MigrateDrupalTestBase.php b/core/modules/migrate_drupal/tests/src/Kernel/MigrateDrupalTestBase.php
index 2cf4eb1..fad811b 100644
--- a/core/modules/migrate_drupal/tests/src/Kernel/MigrateDrupalTestBase.php
+++ b/core/modules/migrate_drupal/tests/src/Kernel/MigrateDrupalTestBase.php
@@ -15,7 +15,7 @@
    *
    * @var array
    */
-  public static $modules = array('system', 'user', 'field', 'migrate_drupal', 'options', 'file');
+  protected static $modules = array('system', 'user', 'field', 'migrate_drupal', 'options', 'file');
 
   /**
    * {@inheritdoc}
diff --git a/core/modules/migrate_drupal/tests/src/Kernel/Plugin/migrate/source/d8/ConfigTest.php b/core/modules/migrate_drupal/tests/src/Kernel/Plugin/migrate/source/d8/ConfigTest.php
index 20b8095..3b4ccd4 100644
--- a/core/modules/migrate_drupal/tests/src/Kernel/Plugin/migrate/source/d8/ConfigTest.php
+++ b/core/modules/migrate_drupal/tests/src/Kernel/Plugin/migrate/source/d8/ConfigTest.php
@@ -15,7 +15,7 @@ class ConfigTest extends MigrateSqlSourceTestBase {
   /**
    * {@inheritdoc}
    */
-  public static $modules = ['migrate_drupal'];
+  protected static $modules = ['migrate_drupal'];
 
   /**
    * {@inheritdoc}
diff --git a/core/modules/migrate_drupal/tests/src/Kernel/d6/EntityContentBaseTest.php b/core/modules/migrate_drupal/tests/src/Kernel/d6/EntityContentBaseTest.php
index 5074473..2099132 100644
--- a/core/modules/migrate_drupal/tests/src/Kernel/d6/EntityContentBaseTest.php
+++ b/core/modules/migrate_drupal/tests/src/Kernel/d6/EntityContentBaseTest.php
@@ -17,7 +17,7 @@ class EntityContentBaseTest extends MigrateDrupal6TestBase {
   /**
    * {@inheritdoc}
    */
-  public static $modules = ['migrate_overwrite_test'];
+  protected static $modules = ['migrate_overwrite_test'];
 
   /**
    * {@inheritdoc}
diff --git a/core/modules/migrate_drupal/tests/src/Kernel/d6/MigrateDrupal6TestBase.php b/core/modules/migrate_drupal/tests/src/Kernel/d6/MigrateDrupal6TestBase.php
index 3a9467e..e7dcd86 100644
--- a/core/modules/migrate_drupal/tests/src/Kernel/d6/MigrateDrupal6TestBase.php
+++ b/core/modules/migrate_drupal/tests/src/Kernel/d6/MigrateDrupal6TestBase.php
@@ -12,7 +12,7 @@
   /**
    * {@inheritdoc}
    */
-  public static $modules = [
+  protected static $modules = [
     'datetime',
     'filter',
     'image',
diff --git a/core/modules/migrate_drupal/tests/src/Kernel/dependencies/MigrateDependenciesTest.php b/core/modules/migrate_drupal/tests/src/Kernel/dependencies/MigrateDependenciesTest.php
index 1b5736d..9e2c227 100644
--- a/core/modules/migrate_drupal/tests/src/Kernel/dependencies/MigrateDependenciesTest.php
+++ b/core/modules/migrate_drupal/tests/src/Kernel/dependencies/MigrateDependenciesTest.php
@@ -16,7 +16,7 @@ class MigrateDependenciesTest extends MigrateDrupal6TestBase {
   /**
    * {@inheritdoc}
    */
-  public static $modules = ['aggregator', 'comment'];
+  protected static $modules = ['aggregator', 'comment'];
 
   /**
    * Tests that the order is correct when loading several migrations.
diff --git a/core/modules/node/tests/src/Kernel/Action/UnpublishByKeywordActionTest.php b/core/modules/node/tests/src/Kernel/Action/UnpublishByKeywordActionTest.php
index 88eb122..f7d4efb 100644
--- a/core/modules/node/tests/src/Kernel/Action/UnpublishByKeywordActionTest.php
+++ b/core/modules/node/tests/src/Kernel/Action/UnpublishByKeywordActionTest.php
@@ -13,7 +13,7 @@ class UnpublishByKeywordActionTest extends KernelTestBase {
   /**
    * {@inheritdoc}
    */
-  public static $modules = ['action', 'node', 'system', 'user'];
+  protected static $modules = ['action', 'node', 'system', 'user'];
 
   /**
    * Tests creating an action using the node_unpublish_by_keyword_action plugin.
diff --git a/core/modules/node/tests/src/Kernel/Config/NodeImportChangeTest.php b/core/modules/node/tests/src/Kernel/Config/NodeImportChangeTest.php
index edb9ae0..af5bf2e 100644
--- a/core/modules/node/tests/src/Kernel/Config/NodeImportChangeTest.php
+++ b/core/modules/node/tests/src/Kernel/Config/NodeImportChangeTest.php
@@ -17,7 +17,7 @@ class NodeImportChangeTest extends KernelTestBase {
    *
    * @var array
    */
-  public static $modules = ['node', 'field', 'text', 'system', 'node_test_config', 'user'];
+  protected static $modules = ['node', 'field', 'text', 'system', 'node_test_config', 'user'];
 
   /**
    * Set the default field storage backend for fields created during tests.
diff --git a/core/modules/node/tests/src/Kernel/Config/NodeImportCreateTest.php b/core/modules/node/tests/src/Kernel/Config/NodeImportCreateTest.php
index f4fd1e1..ec207b9 100644
--- a/core/modules/node/tests/src/Kernel/Config/NodeImportCreateTest.php
+++ b/core/modules/node/tests/src/Kernel/Config/NodeImportCreateTest.php
@@ -18,7 +18,7 @@ class NodeImportCreateTest extends KernelTestBase {
    *
    * @var array
    */
-  public static $modules = array('node', 'field', 'text', 'system', 'user');
+  protected static $modules = array('node', 'field', 'text', 'system', 'user');
 
   /**
    * Set the default field storage backend for fields created during tests.
diff --git a/core/modules/node/tests/src/Kernel/Migrate/MigrateNodeStubTest.php b/core/modules/node/tests/src/Kernel/Migrate/MigrateNodeStubTest.php
index 5b393b1..d0b66f7 100644
--- a/core/modules/node/tests/src/Kernel/Migrate/MigrateNodeStubTest.php
+++ b/core/modules/node/tests/src/Kernel/Migrate/MigrateNodeStubTest.php
@@ -18,7 +18,7 @@ class MigrateNodeStubTest extends MigrateDrupalTestBase {
   /**
    * {@inheritdoc}
    */
-  public static $modules = ['node'];
+  protected static $modules = ['node'];
 
   /**
    * {@inheritdoc}
diff --git a/core/modules/node/tests/src/Kernel/Migrate/d6/MigrateNodeSettingPromoteTest.php b/core/modules/node/tests/src/Kernel/Migrate/d6/MigrateNodeSettingPromoteTest.php
index a434cc7..59eb991 100644
--- a/core/modules/node/tests/src/Kernel/Migrate/d6/MigrateNodeSettingPromoteTest.php
+++ b/core/modules/node/tests/src/Kernel/Migrate/d6/MigrateNodeSettingPromoteTest.php
@@ -10,7 +10,7 @@
  */
 class MigrateNodeSettingPromoteTest extends MigrateDrupal6TestBase {
 
-  public static $modules = ['node', 'text'];
+  protected static $modules = ['node', 'text'];
 
   /**
    * {@inheritdoc}
diff --git a/core/modules/node/tests/src/Kernel/Migrate/d6/MigrateNodeSettingStatusTest.php b/core/modules/node/tests/src/Kernel/Migrate/d6/MigrateNodeSettingStatusTest.php
index 5c4ed67..1bb11d5 100644
--- a/core/modules/node/tests/src/Kernel/Migrate/d6/MigrateNodeSettingStatusTest.php
+++ b/core/modules/node/tests/src/Kernel/Migrate/d6/MigrateNodeSettingStatusTest.php
@@ -10,7 +10,7 @@
  */
 class MigrateNodeSettingStatusTest extends MigrateDrupal6TestBase {
 
-  public static $modules = ['node', 'text'];
+  protected static $modules = ['node', 'text'];
 
   /**
    * {@inheritdoc}
diff --git a/core/modules/node/tests/src/Kernel/Migrate/d6/MigrateNodeSettingStickyTest.php b/core/modules/node/tests/src/Kernel/Migrate/d6/MigrateNodeSettingStickyTest.php
index 1b100b1..261369c 100644
--- a/core/modules/node/tests/src/Kernel/Migrate/d6/MigrateNodeSettingStickyTest.php
+++ b/core/modules/node/tests/src/Kernel/Migrate/d6/MigrateNodeSettingStickyTest.php
@@ -10,7 +10,7 @@
  */
 class MigrateNodeSettingStickyTest extends MigrateDrupal6TestBase {
 
-  public static $modules = ['node', 'text'];
+  protected static $modules = ['node', 'text'];
 
   /**
    * {@inheritdoc}
diff --git a/core/modules/node/tests/src/Kernel/Migrate/d6/MigrateNodeTest.php b/core/modules/node/tests/src/Kernel/Migrate/d6/MigrateNodeTest.php
index 122199f..de00b00 100644
--- a/core/modules/node/tests/src/Kernel/Migrate/d6/MigrateNodeTest.php
+++ b/core/modules/node/tests/src/Kernel/Migrate/d6/MigrateNodeTest.php
@@ -19,7 +19,7 @@ class MigrateNodeTest extends MigrateNodeTestBase {
   /**
    * {@inheritdoc}
    */
-  public static $modules = ['language', 'content_translation'];
+  protected static $modules = ['language', 'content_translation'];
 
   /**
    * {@inheritdoc}
diff --git a/core/modules/node/tests/src/Kernel/Migrate/d7/MigrateNodeSettingsTest.php b/core/modules/node/tests/src/Kernel/Migrate/d7/MigrateNodeSettingsTest.php
index d2924f8..474706a 100644
--- a/core/modules/node/tests/src/Kernel/Migrate/d7/MigrateNodeSettingsTest.php
+++ b/core/modules/node/tests/src/Kernel/Migrate/d7/MigrateNodeSettingsTest.php
@@ -19,7 +19,7 @@ class MigrateNodeSettingsTest extends MigrateDrupal7TestBase {
    *
    * @var array
    */
-  public static $modules = ['node'];
+  protected static $modules = ['node'];
 
   /**
    * {@inheritdoc}
diff --git a/core/modules/node/tests/src/Kernel/Migrate/d7/MigrateNodeTest.php b/core/modules/node/tests/src/Kernel/Migrate/d7/MigrateNodeTest.php
index f7b98bd..7a12af2 100644
--- a/core/modules/node/tests/src/Kernel/Migrate/d7/MigrateNodeTest.php
+++ b/core/modules/node/tests/src/Kernel/Migrate/d7/MigrateNodeTest.php
@@ -13,7 +13,7 @@
  */
 class MigrateNodeTest extends MigrateDrupal7TestBase {
 
-  public static $modules = array(
+  protected static $modules = array(
     'comment',
     'datetime',
     'filter',
diff --git a/core/modules/node/tests/src/Kernel/Migrate/d7/MigrateNodeTitleLabelTest.php b/core/modules/node/tests/src/Kernel/Migrate/d7/MigrateNodeTitleLabelTest.php
index f0fc493..88c34e3 100644
--- a/core/modules/node/tests/src/Kernel/Migrate/d7/MigrateNodeTitleLabelTest.php
+++ b/core/modules/node/tests/src/Kernel/Migrate/d7/MigrateNodeTitleLabelTest.php
@@ -12,7 +12,7 @@
  */
 class MigrateNodeTitleLabelTest extends MigrateDrupal7TestBase {
 
-  public static $modules = ['node', 'text'];
+  protected static $modules = ['node', 'text'];
 
   /**
    * {@inheritdoc}
diff --git a/core/modules/node/tests/src/Kernel/Migrate/d7/MigrateNodeTypeTest.php b/core/modules/node/tests/src/Kernel/Migrate/d7/MigrateNodeTypeTest.php
index 8b98ec3..3065fbd 100644
--- a/core/modules/node/tests/src/Kernel/Migrate/d7/MigrateNodeTypeTest.php
+++ b/core/modules/node/tests/src/Kernel/Migrate/d7/MigrateNodeTypeTest.php
@@ -20,7 +20,7 @@ class MigrateNodeTypeTest extends MigrateDrupal7TestBase {
    *
    * @var array
    */
-  public static $modules = array('node', 'text', 'filter');
+  protected static $modules = array('node', 'text', 'filter');
 
   /**
    * {@inheritdoc}
diff --git a/core/modules/node/tests/src/Kernel/NodeAccessTest.php b/core/modules/node/tests/src/Kernel/NodeAccessTest.php
index b8e2251..dec4137 100644
--- a/core/modules/node/tests/src/Kernel/NodeAccessTest.php
+++ b/core/modules/node/tests/src/Kernel/NodeAccessTest.php
@@ -34,7 +34,7 @@ class NodeAccessTest extends KernelTestBase {
   /**
    * {@inheritdoc}
    */
-  public static $modules = [
+  protected static $modules = [
     'node',
     'datetime',
     'user',
diff --git a/core/modules/node/tests/src/Kernel/NodeBodyFieldStorageTest.php b/core/modules/node/tests/src/Kernel/NodeBodyFieldStorageTest.php
index 6c1faf3..50f1682 100644
--- a/core/modules/node/tests/src/Kernel/NodeBodyFieldStorageTest.php
+++ b/core/modules/node/tests/src/Kernel/NodeBodyFieldStorageTest.php
@@ -19,7 +19,7 @@ class NodeBodyFieldStorageTest extends KernelTestBase {
    *
    * @var array
    */
-  public static $modules = ['user', 'system', 'field', 'node', 'text', 'filter'];
+  protected static $modules = ['user', 'system', 'field', 'node', 'text', 'filter'];
 
   protected function setUp() {
     parent::setUp();
diff --git a/core/modules/node/tests/src/Kernel/NodeConditionTest.php b/core/modules/node/tests/src/Kernel/NodeConditionTest.php
index 7636d52..279f001 100644
--- a/core/modules/node/tests/src/Kernel/NodeConditionTest.php
+++ b/core/modules/node/tests/src/Kernel/NodeConditionTest.php
@@ -13,7 +13,7 @@
  */
 class NodeConditionTest extends EntityKernelTestBase {
 
-  public static $modules = array('node');
+  protected static $modules = array('node');
 
   protected function setUp() {
     parent::setUp();
diff --git a/core/modules/node/tests/src/Kernel/NodeFieldAccessTest.php b/core/modules/node/tests/src/Kernel/NodeFieldAccessTest.php
index f88e45e..8947695 100644
--- a/core/modules/node/tests/src/Kernel/NodeFieldAccessTest.php
+++ b/core/modules/node/tests/src/Kernel/NodeFieldAccessTest.php
@@ -19,7 +19,7 @@ class NodeFieldAccessTest extends EntityKernelTestBase {
    *
    * @var array
    */
-  public static $modules = array('node');
+  protected static $modules = array('node');
 
   /**
    * Fields that only users with administer nodes permissions can change.
diff --git a/core/modules/node/tests/src/Kernel/NodeFieldOverridesTest.php b/core/modules/node/tests/src/Kernel/NodeFieldOverridesTest.php
index aee0272..f0c473a 100644
--- a/core/modules/node/tests/src/Kernel/NodeFieldOverridesTest.php
+++ b/core/modules/node/tests/src/Kernel/NodeFieldOverridesTest.php
@@ -27,7 +27,7 @@ class NodeFieldOverridesTest extends EntityKernelTestBase {
    *
    * @var array
    */
-  public static $modules = array('user', 'system', 'field', 'node');
+  protected static $modules = array('user', 'system', 'field', 'node');
 
   /**
    * {@inheritdoc}
diff --git a/core/modules/node/tests/src/Kernel/NodeListBuilderTest.php b/core/modules/node/tests/src/Kernel/NodeListBuilderTest.php
index 0a0f145..a39b0a6 100644
--- a/core/modules/node/tests/src/Kernel/NodeListBuilderTest.php
+++ b/core/modules/node/tests/src/Kernel/NodeListBuilderTest.php
@@ -15,7 +15,7 @@ class NodeListBuilderTest extends KernelTestBase {
   /**
    * {@inheritdoc}
    */
-  public static $modules = ['node', 'user'];
+  protected static $modules = ['node', 'user'];
 
   protected function setUp() {
     parent::setUp();
diff --git a/core/modules/node/tests/src/Kernel/NodeOwnerTest.php b/core/modules/node/tests/src/Kernel/NodeOwnerTest.php
index d21d5ad..7f9a89f 100644
--- a/core/modules/node/tests/src/Kernel/NodeOwnerTest.php
+++ b/core/modules/node/tests/src/Kernel/NodeOwnerTest.php
@@ -19,7 +19,7 @@ class NodeOwnerTest extends EntityKernelTestBase {
    *
    * @var array
    */
-  public static $modules = array('node', 'language');
+  protected static $modules = array('node', 'language');
 
   protected function setUp() {
     parent::setUp();
diff --git a/core/modules/node/tests/src/Kernel/NodeTokenReplaceTest.php b/core/modules/node/tests/src/Kernel/NodeTokenReplaceTest.php
index c496c83..0790fb1 100644
--- a/core/modules/node/tests/src/Kernel/NodeTokenReplaceTest.php
+++ b/core/modules/node/tests/src/Kernel/NodeTokenReplaceTest.php
@@ -22,7 +22,7 @@ class NodeTokenReplaceTest extends TokenReplaceKernelTestBase {
    *
    * @var array
    */
-  public static $modules = array('node', 'filter');
+  protected static $modules = array('node', 'filter');
 
   /**
    * {@inheritdoc}
diff --git a/core/modules/node/tests/src/Kernel/NodeValidationTest.php b/core/modules/node/tests/src/Kernel/NodeValidationTest.php
index 9fd646e..c5c0c6c 100644
--- a/core/modules/node/tests/src/Kernel/NodeValidationTest.php
+++ b/core/modules/node/tests/src/Kernel/NodeValidationTest.php
@@ -18,7 +18,7 @@ class NodeValidationTest extends EntityKernelTestBase {
    *
    * @var array
    */
-  public static $modules = array('node');
+  protected static $modules = array('node');
 
   /**
    * Set the default field storage backend for fields created during tests.
diff --git a/core/modules/node/tests/src/Kernel/Plugin/migrate/source/d6/NodeByNodeTypeTest.php b/core/modules/node/tests/src/Kernel/Plugin/migrate/source/d6/NodeByNodeTypeTest.php
index d5a8db0..d35d6fe 100644
--- a/core/modules/node/tests/src/Kernel/Plugin/migrate/source/d6/NodeByNodeTypeTest.php
+++ b/core/modules/node/tests/src/Kernel/Plugin/migrate/source/d6/NodeByNodeTypeTest.php
@@ -16,7 +16,7 @@ class NodeByNodeTypeTest extends MigrateSqlSourceTestBase {
   /**
    * {@inheritdoc}
    */
-  public static $modules = ['node', 'user', 'migrate_drupal'];
+  protected static $modules = ['node', 'user', 'migrate_drupal'];
 
   /**
    * {@inheritdoc}
diff --git a/core/modules/node/tests/src/Kernel/Plugin/migrate/source/d6/NodeRevisionByNodeTypeTest.php b/core/modules/node/tests/src/Kernel/Plugin/migrate/source/d6/NodeRevisionByNodeTypeTest.php
index 27e17cc..75434ab 100644
--- a/core/modules/node/tests/src/Kernel/Plugin/migrate/source/d6/NodeRevisionByNodeTypeTest.php
+++ b/core/modules/node/tests/src/Kernel/Plugin/migrate/source/d6/NodeRevisionByNodeTypeTest.php
@@ -16,7 +16,7 @@ class NodeRevisionByNodeTypeTest extends MigrateSqlSourceTestBase {
   /**
    * {@inheritdoc}
    */
-  public static $modules = ['node', 'user', 'migrate_drupal'];
+  protected static $modules = ['node', 'user', 'migrate_drupal'];
 
   /**
    * {@inheritdoc}
diff --git a/core/modules/node/tests/src/Kernel/Plugin/migrate/source/d6/NodeRevisionTest.php b/core/modules/node/tests/src/Kernel/Plugin/migrate/source/d6/NodeRevisionTest.php
index fbc28c5..11d63de 100644
--- a/core/modules/node/tests/src/Kernel/Plugin/migrate/source/d6/NodeRevisionTest.php
+++ b/core/modules/node/tests/src/Kernel/Plugin/migrate/source/d6/NodeRevisionTest.php
@@ -16,7 +16,7 @@ class NodeRevisionTest extends MigrateSqlSourceTestBase {
   /**
    * {@inheritdoc}
    */
-  public static $modules = ['node', 'user', 'migrate_drupal'];
+  protected static $modules = ['node', 'user', 'migrate_drupal'];
 
   /**
    * {@inheritdoc}
diff --git a/core/modules/node/tests/src/Kernel/Plugin/migrate/source/d6/NodeTest.php b/core/modules/node/tests/src/Kernel/Plugin/migrate/source/d6/NodeTest.php
index 4bc1be0..9a78d61 100644
--- a/core/modules/node/tests/src/Kernel/Plugin/migrate/source/d6/NodeTest.php
+++ b/core/modules/node/tests/src/Kernel/Plugin/migrate/source/d6/NodeTest.php
@@ -16,7 +16,7 @@ class NodeTest extends MigrateSqlSourceTestBase {
   /**
    * {@inheritdoc}
    */
-  public static $modules = ['node', 'user', 'migrate_drupal'];
+  protected static $modules = ['node', 'user', 'migrate_drupal'];
 
   /**
    * {@inheritdoc}
diff --git a/core/modules/node/tests/src/Kernel/Plugin/migrate/source/d6/NodeTranslationTest.php b/core/modules/node/tests/src/Kernel/Plugin/migrate/source/d6/NodeTranslationTest.php
index e7de62b..95addeb 100644
--- a/core/modules/node/tests/src/Kernel/Plugin/migrate/source/d6/NodeTranslationTest.php
+++ b/core/modules/node/tests/src/Kernel/Plugin/migrate/source/d6/NodeTranslationTest.php
@@ -14,7 +14,7 @@ class NodeTranslationTest extends NodeTest {
   /**
    * {@inheritdoc}
    */
-  public static $modules = ['node', 'user', 'migrate_drupal'];
+  protected static $modules = ['node', 'user', 'migrate_drupal'];
 
   /**
    * {@inheritdoc}
diff --git a/core/modules/node/tests/src/Kernel/Plugin/migrate/source/d6/NodeTypeTest.php b/core/modules/node/tests/src/Kernel/Plugin/migrate/source/d6/NodeTypeTest.php
index 38af680..882e5d0 100644
--- a/core/modules/node/tests/src/Kernel/Plugin/migrate/source/d6/NodeTypeTest.php
+++ b/core/modules/node/tests/src/Kernel/Plugin/migrate/source/d6/NodeTypeTest.php
@@ -16,7 +16,7 @@ class NodeTypeTest extends MigrateSqlSourceTestBase {
   /**
    * {@inheritdoc}
    */
-  public static $modules = ['node', 'user', 'migrate_drupal'];
+  protected static $modules = ['node', 'user', 'migrate_drupal'];
 
   /**
    * {@inheritdoc}
diff --git a/core/modules/node/tests/src/Kernel/Plugin/migrate/source/d6/ViewModeTest.php b/core/modules/node/tests/src/Kernel/Plugin/migrate/source/d6/ViewModeTest.php
index 18d941c..e818cbe 100644
--- a/core/modules/node/tests/src/Kernel/Plugin/migrate/source/d6/ViewModeTest.php
+++ b/core/modules/node/tests/src/Kernel/Plugin/migrate/source/d6/ViewModeTest.php
@@ -16,7 +16,7 @@ class ViewModeTest extends MigrateSqlSourceTestBase {
   /**
    * {@inheritdoc}
    */
-  public static $modules = ['node', 'user', 'migrate_drupal'];
+  protected static $modules = ['node', 'user', 'migrate_drupal'];
 
   /**
    * {@inheritdoc}
diff --git a/core/modules/node/tests/src/Kernel/Plugin/migrate/source/d7/NodeTest.php b/core/modules/node/tests/src/Kernel/Plugin/migrate/source/d7/NodeTest.php
index 6b19b95..fe8c5d4 100644
--- a/core/modules/node/tests/src/Kernel/Plugin/migrate/source/d7/NodeTest.php
+++ b/core/modules/node/tests/src/Kernel/Plugin/migrate/source/d7/NodeTest.php
@@ -16,7 +16,7 @@ class NodeTest extends MigrateSqlSourceTestBase {
   /**
    * {@inheritdoc}
    */
-  public static $modules = ['node', 'user', 'migrate_drupal'];
+  protected static $modules = ['node', 'user', 'migrate_drupal'];
 
   /**
    * {@inheritdoc}
diff --git a/core/modules/node/tests/src/Kernel/Plugin/migrate/source/d7/NodeTypeTest.php b/core/modules/node/tests/src/Kernel/Plugin/migrate/source/d7/NodeTypeTest.php
index 1c738d1..695429f 100644
--- a/core/modules/node/tests/src/Kernel/Plugin/migrate/source/d7/NodeTypeTest.php
+++ b/core/modules/node/tests/src/Kernel/Plugin/migrate/source/d7/NodeTypeTest.php
@@ -16,7 +16,7 @@ class NodeTypeTest extends MigrateSqlSourceTestBase {
   /**
    * {@inheritdoc}
    */
-  public static $modules = ['node', 'user', 'migrate_drupal'];
+  protected static $modules = ['node', 'user', 'migrate_drupal'];
 
   /**
    * {@inheritdoc}
diff --git a/core/modules/node/tests/src/Kernel/Views/NidArgumentTest.php b/core/modules/node/tests/src/Kernel/Views/NidArgumentTest.php
index 78ec67b..faea637 100644
--- a/core/modules/node/tests/src/Kernel/Views/NidArgumentTest.php
+++ b/core/modules/node/tests/src/Kernel/Views/NidArgumentTest.php
@@ -18,7 +18,7 @@ class NidArgumentTest extends ViewsKernelTestBase {
   /**
    * {@inheritdoc}
    */
-  public static $modules = ['node', 'field', 'text', 'node_test_config', 'user', 'node_test_views'];
+  protected static $modules = ['node', 'field', 'text', 'node_test_config', 'user', 'node_test_views'];
 
   /**
    * Views used by this test.
diff --git a/core/modules/node/tests/src/Kernel/Views/NodeViewsFieldAccessTest.php b/core/modules/node/tests/src/Kernel/Views/NodeViewsFieldAccessTest.php
index 7c68e88..4587d6f 100644
--- a/core/modules/node/tests/src/Kernel/Views/NodeViewsFieldAccessTest.php
+++ b/core/modules/node/tests/src/Kernel/Views/NodeViewsFieldAccessTest.php
@@ -17,7 +17,7 @@ class NodeViewsFieldAccessTest extends FieldFieldAccessTestBase {
   /**
    * {@inheritdoc}
    */
-  public static $modules = ['node', 'entity_test'];
+  protected static $modules = ['node', 'entity_test'];
 
   /**
    * {@inheritdoc}
diff --git a/core/modules/node/tests/src/Kernel/Views/RevisionCreateTimestampTest.php b/core/modules/node/tests/src/Kernel/Views/RevisionCreateTimestampTest.php
index 287bf48..3c2ffca 100644
--- a/core/modules/node/tests/src/Kernel/Views/RevisionCreateTimestampTest.php
+++ b/core/modules/node/tests/src/Kernel/Views/RevisionCreateTimestampTest.php
@@ -18,7 +18,7 @@ class RevisionCreateTimestampTest extends ViewsKernelTestBase {
   /**
    * {@inheritdoc}
    */
-  public static $modules = ['node_test_views', 'node', 'views', 'user'];
+  protected static $modules = ['node_test_views', 'node', 'views', 'user'];
 
   /**
    * {@inheritdoc}
diff --git a/core/modules/options/tests/src/Kernel/OptionsFieldTest.php b/core/modules/options/tests/src/Kernel/OptionsFieldTest.php
index 89ac127..3686c04 100644
--- a/core/modules/options/tests/src/Kernel/OptionsFieldTest.php
+++ b/core/modules/options/tests/src/Kernel/OptionsFieldTest.php
@@ -19,7 +19,7 @@ class OptionsFieldTest extends OptionsFieldUnitTestBase {
    *
    * @var array
    */
-  public static $modules = array('options');
+  protected static $modules = array('options');
 
   /**
    * Test that allowed values can be updated.
diff --git a/core/modules/options/tests/src/Kernel/OptionsFieldUnitTestBase.php b/core/modules/options/tests/src/Kernel/OptionsFieldUnitTestBase.php
index 7dd7cbe..491318e 100644
--- a/core/modules/options/tests/src/Kernel/OptionsFieldUnitTestBase.php
+++ b/core/modules/options/tests/src/Kernel/OptionsFieldUnitTestBase.php
@@ -16,7 +16,7 @@
    *
    * @var array
    */
-  public static $modules = array('options');
+  protected static $modules = array('options');
 
   /**
    * The field name used in the test.
diff --git a/core/modules/options/tests/src/Kernel/Views/FileViewsDataTest.php b/core/modules/options/tests/src/Kernel/Views/FileViewsDataTest.php
index 060c05e..ad2e4ec 100644
--- a/core/modules/options/tests/src/Kernel/Views/FileViewsDataTest.php
+++ b/core/modules/options/tests/src/Kernel/Views/FileViewsDataTest.php
@@ -19,7 +19,7 @@ class FileViewsDataTest extends ViewsKernelTestBase {
    *
    * @var array
    */
-  public static $modules = array('file', 'views', 'entity_test', 'user', 'field');
+  protected static $modules = array('file', 'views', 'entity_test', 'user', 'field');
 
   /**
    * Tests views data generated for file field relationship.
diff --git a/core/modules/options/tests/src/Kernel/Views/OptionsTestBase.php b/core/modules/options/tests/src/Kernel/Views/OptionsTestBase.php
index 9f53e63..4f612b6 100644
--- a/core/modules/options/tests/src/Kernel/Views/OptionsTestBase.php
+++ b/core/modules/options/tests/src/Kernel/Views/OptionsTestBase.php
@@ -19,7 +19,7 @@
    *
    * @var array
    */
-  public static $modules = ['options', 'options_test_views', 'node', 'user', 'field'];
+  protected static $modules = ['options', 'options_test_views', 'node', 'user', 'field'];
 
   /**
    * Stores the nodes used for the different tests.
diff --git a/core/modules/options/tests/src/Kernel/Views/ViewsDataTest.php b/core/modules/options/tests/src/Kernel/Views/ViewsDataTest.php
index d023598..801cd1e 100644
--- a/core/modules/options/tests/src/Kernel/Views/ViewsDataTest.php
+++ b/core/modules/options/tests/src/Kernel/Views/ViewsDataTest.php
@@ -15,7 +15,7 @@ class ViewsDataTest extends OptionsTestBase {
   /**
    * {@inheritdoc}
    */
-  public static $modules = ['options', 'options_test', 'entity_test', 'views'];
+  protected static $modules = ['options', 'options_test', 'entity_test', 'views'];
 
   /**
    * The field storage.
diff --git a/core/modules/outside_in/tests/src/FunctionalJavascript/OffCanvasTest.php b/core/modules/outside_in/tests/src/FunctionalJavascript/OffCanvasTest.php
index 8e04fd8..55e9772 100644
--- a/core/modules/outside_in/tests/src/FunctionalJavascript/OffCanvasTest.php
+++ b/core/modules/outside_in/tests/src/FunctionalJavascript/OffCanvasTest.php
@@ -12,7 +12,7 @@ class OffCanvasTest extends OutsideInJavascriptTestBase {
   /**
    * {@inheritdoc}
    */
-  public static $modules = ['block', 'system', 'toolbar', 'outside_in', 'offcanvas_test'];
+  protected static $modules = ['block', 'system', 'toolbar', 'outside_in', 'offcanvas_test'];
 
   /**
    * Tests that regular non-contextual links will work with the off-canvas tray.
diff --git a/core/modules/outside_in/tests/src/FunctionalJavascript/OutsideInBlockFormTest.php b/core/modules/outside_in/tests/src/FunctionalJavascript/OutsideInBlockFormTest.php
index dd79fc2..663b42a 100644
--- a/core/modules/outside_in/tests/src/FunctionalJavascript/OutsideInBlockFormTest.php
+++ b/core/modules/outside_in/tests/src/FunctionalJavascript/OutsideInBlockFormTest.php
@@ -12,7 +12,7 @@ class OutsideInBlockFormTest extends OutsideInJavascriptTestBase {
   /**
    * {@inheritdoc}
    */
-  public static $modules = [
+  protected static $modules = [
     'node',
     'block',
     'system',
diff --git a/core/modules/path/tests/src/Kernel/Migrate/d6/MigrateUrlAliasTest.php b/core/modules/path/tests/src/Kernel/Migrate/d6/MigrateUrlAliasTest.php
index 120d072..4417c0b 100644
--- a/core/modules/path/tests/src/Kernel/Migrate/d6/MigrateUrlAliasTest.php
+++ b/core/modules/path/tests/src/Kernel/Migrate/d6/MigrateUrlAliasTest.php
@@ -16,7 +16,7 @@ class MigrateUrlAliasTest extends MigrateDrupal6TestBase {
   /**
    * {@inheritdoc}
    */
-  public static $modules = array('path');
+  protected static $modules = array('path');
 
   /**
    * {@inheritdoc}
diff --git a/core/modules/path/tests/src/Kernel/Migrate/d7/MigrateUrlAliasTest.php b/core/modules/path/tests/src/Kernel/Migrate/d7/MigrateUrlAliasTest.php
index 88c102b..8229b11 100644
--- a/core/modules/path/tests/src/Kernel/Migrate/d7/MigrateUrlAliasTest.php
+++ b/core/modules/path/tests/src/Kernel/Migrate/d7/MigrateUrlAliasTest.php
@@ -14,7 +14,7 @@ class MigrateUrlAliasTest extends MigrateDrupal7TestBase {
   /**
    * {@inheritdoc}
    */
-  public static $modules = ['path'];
+  protected static $modules = ['path'];
 
   /**
    * {@inheritdoc}
diff --git a/core/modules/path/tests/src/Kernel/PathNoCanonicalLinkTest.php b/core/modules/path/tests/src/Kernel/PathNoCanonicalLinkTest.php
index df64a5c..0fc6436 100644
--- a/core/modules/path/tests/src/Kernel/PathNoCanonicalLinkTest.php
+++ b/core/modules/path/tests/src/Kernel/PathNoCanonicalLinkTest.php
@@ -18,7 +18,7 @@ class PathNoCanonicalLinkTest extends KernelTestBase {
    *
    * @var array
    */
-  public static $modules = array('path', 'content_translation_test', 'language', 'entity_test', 'user', 'system');
+  protected static $modules = array('path', 'content_translation_test', 'language', 'entity_test', 'user', 'system');
 
   protected function setUp() {
     parent::setUp();
diff --git a/core/modules/path/tests/src/Kernel/Plugin/migrate/source/d6/UrlAliasTest.php b/core/modules/path/tests/src/Kernel/Plugin/migrate/source/d6/UrlAliasTest.php
index 1057dff..4cfe6d1 100644
--- a/core/modules/path/tests/src/Kernel/Plugin/migrate/source/d6/UrlAliasTest.php
+++ b/core/modules/path/tests/src/Kernel/Plugin/migrate/source/d6/UrlAliasTest.php
@@ -15,7 +15,7 @@ class UrlAliasTest extends MigrateSqlSourceTestBase {
   /**
    * {@inheritdoc}
    */
-  public static $modules = ['migrate_drupal', 'path'];
+  protected static $modules = ['migrate_drupal', 'path'];
 
   /**
    * {@inheritdoc}
diff --git a/core/modules/path/tests/src/Kernel/Plugin/migrate/source/d7/UrlAliasTest.php b/core/modules/path/tests/src/Kernel/Plugin/migrate/source/d7/UrlAliasTest.php
index 2fdfd36..191b079 100644
--- a/core/modules/path/tests/src/Kernel/Plugin/migrate/source/d7/UrlAliasTest.php
+++ b/core/modules/path/tests/src/Kernel/Plugin/migrate/source/d7/UrlAliasTest.php
@@ -15,7 +15,7 @@ class UrlAliasTest extends MigrateSqlSourceTestBase {
   /**
    * {@inheritdoc}
    */
-  public static $modules = ['migrate_drupal', 'path'];
+  protected static $modules = ['migrate_drupal', 'path'];
 
   /**
    * {@inheritdoc}
diff --git a/core/modules/quickedit/tests/src/Kernel/MetadataGeneratorTest.php b/core/modules/quickedit/tests/src/Kernel/MetadataGeneratorTest.php
index 7fdc8fb..ba76598 100644
--- a/core/modules/quickedit/tests/src/Kernel/MetadataGeneratorTest.php
+++ b/core/modules/quickedit/tests/src/Kernel/MetadataGeneratorTest.php
@@ -18,7 +18,7 @@ class MetadataGeneratorTest extends QuickEditTestBase {
   /**
    * {@inheritdoc}
    */
-  public static $modules = array('quickedit_test');
+  protected static $modules = array('quickedit_test');
 
   /**
    * The manager for editor plugins.
diff --git a/core/modules/quickedit/tests/src/Kernel/QuickEditTestBase.php b/core/modules/quickedit/tests/src/Kernel/QuickEditTestBase.php
index bfdb229..cd2a150 100644
--- a/core/modules/quickedit/tests/src/Kernel/QuickEditTestBase.php
+++ b/core/modules/quickedit/tests/src/Kernel/QuickEditTestBase.php
@@ -16,7 +16,7 @@
    *
    * @var array
    */
-  public static $modules = ['system', 'entity_test', 'field', 'field_test', 'filter', 'user', 'text', 'quickedit'];
+  protected static $modules = ['system', 'entity_test', 'field', 'field_test', 'filter', 'user', 'text', 'quickedit'];
 
   /**
    * Bag of created fields.
diff --git a/core/modules/rdf/tests/src/Kernel/CrudTest.php b/core/modules/rdf/tests/src/Kernel/CrudTest.php
index 60b4208..87cb845 100644
--- a/core/modules/rdf/tests/src/Kernel/CrudTest.php
+++ b/core/modules/rdf/tests/src/Kernel/CrudTest.php
@@ -16,7 +16,7 @@ class CrudTest extends KernelTestBase {
    *
    * @var array
    */
-  public static $modules = array('entity_test', 'rdf', 'system');
+  protected static $modules = array('entity_test', 'rdf', 'system');
 
   /**
    * @var string
diff --git a/core/modules/rdf/tests/src/Kernel/Field/DateTimeFieldRdfaTest.php b/core/modules/rdf/tests/src/Kernel/Field/DateTimeFieldRdfaTest.php
index a35a9c4..6522b3b 100644
--- a/core/modules/rdf/tests/src/Kernel/Field/DateTimeFieldRdfaTest.php
+++ b/core/modules/rdf/tests/src/Kernel/Field/DateTimeFieldRdfaTest.php
@@ -26,7 +26,7 @@ class DateTimeFieldRdfaTest extends FieldRdfaTestBase {
   /**
   * {@inheritdoc}
   */
-  public static $modules = array('datetime');
+  protected static $modules = array('datetime');
 
   protected function setUp() {
     parent::setUp();
diff --git a/core/modules/rdf/tests/src/Kernel/Field/EmailFieldRdfaTest.php b/core/modules/rdf/tests/src/Kernel/Field/EmailFieldRdfaTest.php
index c121751..04e8a79 100644
--- a/core/modules/rdf/tests/src/Kernel/Field/EmailFieldRdfaTest.php
+++ b/core/modules/rdf/tests/src/Kernel/Field/EmailFieldRdfaTest.php
@@ -19,7 +19,7 @@ class EmailFieldRdfaTest extends FieldRdfaTestBase {
   /**
    * {@inheritdoc}
    */
-  public static $modules = array('text');
+  protected static $modules = array('text');
 
   protected function setUp() {
     parent::setUp();
diff --git a/core/modules/rdf/tests/src/Kernel/Field/EntityReferenceRdfaTest.php b/core/modules/rdf/tests/src/Kernel/Field/EntityReferenceRdfaTest.php
index cefa7e0..b3c0281 100644
--- a/core/modules/rdf/tests/src/Kernel/Field/EntityReferenceRdfaTest.php
+++ b/core/modules/rdf/tests/src/Kernel/Field/EntityReferenceRdfaTest.php
@@ -44,7 +44,7 @@ class EntityReferenceRdfaTest extends FieldRdfaTestBase {
   /**
    * {@inheritdoc}
    */
-  public static $modules = ['text', 'filter'];
+  protected static $modules = ['text', 'filter'];
 
   protected function setUp() {
     parent::setUp();
diff --git a/core/modules/rdf/tests/src/Kernel/Field/FieldRdfaDatatypeCallbackTest.php b/core/modules/rdf/tests/src/Kernel/Field/FieldRdfaDatatypeCallbackTest.php
index 1e1a809..8ac289a 100644
--- a/core/modules/rdf/tests/src/Kernel/Field/FieldRdfaDatatypeCallbackTest.php
+++ b/core/modules/rdf/tests/src/Kernel/Field/FieldRdfaDatatypeCallbackTest.php
@@ -19,7 +19,7 @@ class FieldRdfaDatatypeCallbackTest extends FieldRdfaTestBase {
   /**
    * {@inheritdoc}
    */
-  public static $modules = array('text', 'filter');
+  protected static $modules = array('text', 'filter');
 
   protected function setUp() {
     parent::setUp();
diff --git a/core/modules/rdf/tests/src/Kernel/Field/FieldRdfaTestBase.php b/core/modules/rdf/tests/src/Kernel/Field/FieldRdfaTestBase.php
index 7431185..1ef3c14 100644
--- a/core/modules/rdf/tests/src/Kernel/Field/FieldRdfaTestBase.php
+++ b/core/modules/rdf/tests/src/Kernel/Field/FieldRdfaTestBase.php
@@ -48,7 +48,7 @@
    *
    * @var array
    */
-  public static $modules = array('rdf');
+  protected static $modules = array('rdf');
 
   /**
    * @var string
diff --git a/core/modules/rdf/tests/src/Kernel/Field/LinkFieldRdfaTest.php b/core/modules/rdf/tests/src/Kernel/Field/LinkFieldRdfaTest.php
index d4e1cf0..6322d5b 100644
--- a/core/modules/rdf/tests/src/Kernel/Field/LinkFieldRdfaTest.php
+++ b/core/modules/rdf/tests/src/Kernel/Field/LinkFieldRdfaTest.php
@@ -19,7 +19,7 @@ class LinkFieldRdfaTest extends FieldRdfaTestBase {
   /**
    * {@inheritdoc}
    */
-  public static $modules = array('link', 'text');
+  protected static $modules = array('link', 'text');
 
   /**
    * {@inheritdoc}
diff --git a/core/modules/rdf/tests/src/Kernel/Field/TelephoneFieldRdfaTest.php b/core/modules/rdf/tests/src/Kernel/Field/TelephoneFieldRdfaTest.php
index 9741256..6a5752e 100644
--- a/core/modules/rdf/tests/src/Kernel/Field/TelephoneFieldRdfaTest.php
+++ b/core/modules/rdf/tests/src/Kernel/Field/TelephoneFieldRdfaTest.php
@@ -26,7 +26,7 @@ class TelephoneFieldRdfaTest extends FieldRdfaTestBase {
   /**
    * {@inheritdoc}
    */
-  public static $modules = array('telephone', 'text');
+  protected static $modules = array('telephone', 'text');
 
   protected function setUp() {
     parent::setUp();
diff --git a/core/modules/rdf/tests/src/Kernel/Field/TextFieldRdfaTest.php b/core/modules/rdf/tests/src/Kernel/Field/TextFieldRdfaTest.php
index cce3499..4ba7258 100644
--- a/core/modules/rdf/tests/src/Kernel/Field/TextFieldRdfaTest.php
+++ b/core/modules/rdf/tests/src/Kernel/Field/TextFieldRdfaTest.php
@@ -33,7 +33,7 @@ class TextFieldRdfaTest extends FieldRdfaTestBase {
   /**
    * {@inheritdoc}
    */
-  public static $modules = array('text', 'filter');
+  protected static $modules = array('text', 'filter');
 
   protected function setUp() {
     parent::setUp();
diff --git a/core/modules/rdf/tests/src/Kernel/RdfaAttributesTest.php b/core/modules/rdf/tests/src/Kernel/RdfaAttributesTest.php
index 42a4dc4..8749554 100644
--- a/core/modules/rdf/tests/src/Kernel/RdfaAttributesTest.php
+++ b/core/modules/rdf/tests/src/Kernel/RdfaAttributesTest.php
@@ -16,7 +16,7 @@ class RdfaAttributesTest extends KernelTestBase {
    *
    * @var array
    */
-  public static $modules = array('rdf');
+  protected static $modules = array('rdf');
 
   /**
    * Test attribute creation for mappings which use 'property'.
diff --git a/core/modules/responsive_image/tests/src/Kernel/ResponsiveImageIntegrationTest.php b/core/modules/responsive_image/tests/src/Kernel/ResponsiveImageIntegrationTest.php
index d481291..00641c6 100644
--- a/core/modules/responsive_image/tests/src/Kernel/ResponsiveImageIntegrationTest.php
+++ b/core/modules/responsive_image/tests/src/Kernel/ResponsiveImageIntegrationTest.php
@@ -18,7 +18,7 @@ class ResponsiveImageIntegrationTest extends KernelTestBase {
   /**
    * {@inheritdoc}
    */
-  public static $modules = ['responsive_image', 'field', 'image', 'file', 'entity_test', 'breakpoint', 'responsive_image_test_module'];
+  protected static $modules = ['responsive_image', 'field', 'image', 'file', 'entity_test', 'breakpoint', 'responsive_image_test_module'];
 
   /**
    * Tests integration with entity view display.
diff --git a/core/modules/rest/tests/src/Kernel/Entity/ConfigDependenciesTest.php b/core/modules/rest/tests/src/Kernel/Entity/ConfigDependenciesTest.php
index f62ee03..2346f82 100644
--- a/core/modules/rest/tests/src/Kernel/Entity/ConfigDependenciesTest.php
+++ b/core/modules/rest/tests/src/Kernel/Entity/ConfigDependenciesTest.php
@@ -17,7 +17,7 @@ class ConfigDependenciesTest extends KernelTestBase {
   /**
    * {@inheritdoc}
    */
-  public static $modules = ['rest', 'entity_test', 'serialization'];
+  protected static $modules = ['rest', 'entity_test', 'serialization'];
 
   /**
    * @covers ::calculateDependencies
diff --git a/core/modules/rest/tests/src/Kernel/Entity/RestResourceConfigTest.php b/core/modules/rest/tests/src/Kernel/Entity/RestResourceConfigTest.php
index 89e9b1d..5857433 100644
--- a/core/modules/rest/tests/src/Kernel/Entity/RestResourceConfigTest.php
+++ b/core/modules/rest/tests/src/Kernel/Entity/RestResourceConfigTest.php
@@ -16,7 +16,7 @@ class RestResourceConfigTest extends KernelTestBase {
   /**
    * {@inheritdoc}
    */
-  public static $modules = ['rest', 'entity_test', 'serialization', 'basic_auth', 'user', 'hal'];
+  protected static $modules = ['rest', 'entity_test', 'serialization', 'basic_auth', 'user', 'hal'];
 
   /**
    * @covers ::calculateDependencies
diff --git a/core/modules/rest/tests/src/Kernel/RequestHandlerTest.php b/core/modules/rest/tests/src/Kernel/RequestHandlerTest.php
index 905b449..bdf13b9 100644
--- a/core/modules/rest/tests/src/Kernel/RequestHandlerTest.php
+++ b/core/modules/rest/tests/src/Kernel/RequestHandlerTest.php
@@ -28,7 +28,7 @@ class RequestHandlerTest extends KernelTestBase {
    */
   protected $requestHandler;
 
-  public static $modules = ['serialization', 'rest'];
+  protected static $modules = ['serialization', 'rest'];
 
   /**
    * The entity storage.
diff --git a/core/modules/rest/tests/src/Kernel/RestLinkManagerTest.php b/core/modules/rest/tests/src/Kernel/RestLinkManagerTest.php
index ab558e5..e093a92 100644
--- a/core/modules/rest/tests/src/Kernel/RestLinkManagerTest.php
+++ b/core/modules/rest/tests/src/Kernel/RestLinkManagerTest.php
@@ -14,7 +14,7 @@ class RestLinkManagerTest extends KernelTestBase {
   /**
    * {@inheritdoc}
    */
-  public static $modules = ['serialization', 'rest', 'rest_test', 'system'];
+  protected static $modules = ['serialization', 'rest', 'rest_test', 'system'];
 
   /**
    * {@inheritdoc}
diff --git a/core/modules/rest/tests/src/Kernel/Views/RestExportTest.php b/core/modules/rest/tests/src/Kernel/Views/RestExportTest.php
index f3a8f04..04c708c 100644
--- a/core/modules/rest/tests/src/Kernel/Views/RestExportTest.php
+++ b/core/modules/rest/tests/src/Kernel/Views/RestExportTest.php
@@ -24,7 +24,7 @@ class RestExportTest extends ViewsKernelTestBase {
   /**
    * {@inheritdoc}
    */
-  public static $modules = ['rest_test_views', 'serialization', 'rest', 'entity_test'];
+  protected static $modules = ['rest_test_views', 'serialization', 'rest', 'entity_test'];
 
   /**
    * {@inheritdoc}
diff --git a/core/modules/rest/tests/src/Kernel/Views/StyleSerializerKernelTest.php b/core/modules/rest/tests/src/Kernel/Views/StyleSerializerKernelTest.php
index 829d08b..029b523 100644
--- a/core/modules/rest/tests/src/Kernel/Views/StyleSerializerKernelTest.php
+++ b/core/modules/rest/tests/src/Kernel/Views/StyleSerializerKernelTest.php
@@ -20,7 +20,7 @@ class StyleSerializerKernelTest extends ViewsKernelTestBase {
   /**
    * {@inheritdoc}
    */
-  public static $modules = ['rest_test_views', 'serialization', 'rest'];
+  protected static $modules = ['rest_test_views', 'serialization', 'rest'];
 
   /**
    * {@inheritdoc}
diff --git a/core/modules/search/tests/src/Kernel/Migrate/d6/MigrateSearchPageTest.php b/core/modules/search/tests/src/Kernel/Migrate/d6/MigrateSearchPageTest.php
index bcbc40e..91a4901 100644
--- a/core/modules/search/tests/src/Kernel/Migrate/d6/MigrateSearchPageTest.php
+++ b/core/modules/search/tests/src/Kernel/Migrate/d6/MigrateSearchPageTest.php
@@ -16,7 +16,7 @@ class MigrateSearchPageTest extends MigrateDrupal6TestBase {
   /**
    * {@inheritdoc}
    */
-  public static $modules = ['search'];
+  protected static $modules = ['search'];
 
   /**
    * {@inheritdoc}
diff --git a/core/modules/search/tests/src/Kernel/Migrate/d6/MigrateSearchSettingsTest.php b/core/modules/search/tests/src/Kernel/Migrate/d6/MigrateSearchSettingsTest.php
index e480fec..8a56a94 100644
--- a/core/modules/search/tests/src/Kernel/Migrate/d6/MigrateSearchSettingsTest.php
+++ b/core/modules/search/tests/src/Kernel/Migrate/d6/MigrateSearchSettingsTest.php
@@ -17,7 +17,7 @@ class MigrateSearchSettingsTest extends MigrateDrupal6TestBase {
   /**
    * {@inheritdoc}
    */
-  public static $modules = ['search'];
+  protected static $modules = ['search'];
 
   /**
    * {@inheritdoc}
diff --git a/core/modules/search/tests/src/Kernel/Migrate/d7/MigrateSearchPageTest.php b/core/modules/search/tests/src/Kernel/Migrate/d7/MigrateSearchPageTest.php
index d7dae3e..e5d9152 100644
--- a/core/modules/search/tests/src/Kernel/Migrate/d7/MigrateSearchPageTest.php
+++ b/core/modules/search/tests/src/Kernel/Migrate/d7/MigrateSearchPageTest.php
@@ -18,7 +18,7 @@ class MigrateSearchPageTest extends MigrateDrupal7TestBase {
    *
    * {@inheritdoc}
    */
-  public static $modules = array('node', 'search');
+  protected static $modules = array('node', 'search');
 
   /**
    * {@inheritdoc}
diff --git a/core/modules/search/tests/src/Kernel/Migrate/d7/MigrateSearchSettingsTest.php b/core/modules/search/tests/src/Kernel/Migrate/d7/MigrateSearchSettingsTest.php
index 2306ce7..47f584a 100644
--- a/core/modules/search/tests/src/Kernel/Migrate/d7/MigrateSearchSettingsTest.php
+++ b/core/modules/search/tests/src/Kernel/Migrate/d7/MigrateSearchSettingsTest.php
@@ -11,7 +11,7 @@
  */
 class MigrateSearchSettingsTest extends MigrateDrupal7TestBase {
 
-  public static $modules = ['search'];
+  protected static $modules = ['search'];
 
   /**
    * {@inheritdoc}
diff --git a/core/modules/search/tests/src/Kernel/SearchExcerptTest.php b/core/modules/search/tests/src/Kernel/SearchExcerptTest.php
index 85c0917..f2c2367 100644
--- a/core/modules/search/tests/src/Kernel/SearchExcerptTest.php
+++ b/core/modules/search/tests/src/Kernel/SearchExcerptTest.php
@@ -16,7 +16,7 @@ class SearchExcerptTest extends KernelTestBase {
    *
    * @var array
    */
-  public static $modules = array('search', 'search_langcode_test');
+  protected static $modules = array('search', 'search_langcode_test');
 
   /**
    * Tests search_excerpt() with several simulated search keywords.
diff --git a/core/modules/search/tests/src/Kernel/SearchMatchTest.php b/core/modules/search/tests/src/Kernel/SearchMatchTest.php
index 0a17f71..36c36d8 100644
--- a/core/modules/search/tests/src/Kernel/SearchMatchTest.php
+++ b/core/modules/search/tests/src/Kernel/SearchMatchTest.php
@@ -23,7 +23,7 @@ class SearchMatchTest extends KernelTestBase {
    *
    * @var array
    */
-  public static $modules = ['search'];
+  protected static $modules = ['search'];
 
   /**
    * {@inheritdoc}
diff --git a/core/modules/serialization/tests/src/Kernel/EntityResolverTest.php b/core/modules/serialization/tests/src/Kernel/EntityResolverTest.php
index ec94028..d0c7061 100644
--- a/core/modules/serialization/tests/src/Kernel/EntityResolverTest.php
+++ b/core/modules/serialization/tests/src/Kernel/EntityResolverTest.php
@@ -19,7 +19,7 @@ class EntityResolverTest extends NormalizerTestBase {
    *
    * @var array
    */
-  public static $modules = ['hal', 'rest'];
+  protected static $modules = ['hal', 'rest'];
 
   /**
    * The format being tested.
diff --git a/core/modules/serialization/tests/src/Kernel/EntitySerializationTest.php b/core/modules/serialization/tests/src/Kernel/EntitySerializationTest.php
index 0f84d3d..8d00eb8 100644
--- a/core/modules/serialization/tests/src/Kernel/EntitySerializationTest.php
+++ b/core/modules/serialization/tests/src/Kernel/EntitySerializationTest.php
@@ -17,7 +17,7 @@ class EntitySerializationTest extends NormalizerTestBase {
    *
    * @var array
    */
-  public static $modules = array('serialization', 'system', 'field', 'entity_test', 'text', 'filter', 'user', 'entity_serialization_test');
+  protected static $modules = array('serialization', 'system', 'field', 'entity_test', 'text', 'filter', 'user', 'entity_serialization_test');
 
   /**
    * The test values.
diff --git a/core/modules/serialization/tests/src/Kernel/NormalizerTestBase.php b/core/modules/serialization/tests/src/Kernel/NormalizerTestBase.php
index 7706b6d..fb3a5db 100644
--- a/core/modules/serialization/tests/src/Kernel/NormalizerTestBase.php
+++ b/core/modules/serialization/tests/src/Kernel/NormalizerTestBase.php
@@ -16,7 +16,7 @@
    *
    * @var array
    */
-  public static $modules = array('serialization', 'system', 'field', 'entity_test', 'text', 'filter', 'user');
+  protected static $modules = array('serialization', 'system', 'field', 'entity_test', 'text', 'filter', 'user');
 
   protected function setUp() {
     parent::setUp();
diff --git a/core/modules/serialization/tests/src/Kernel/SerializationTest.php b/core/modules/serialization/tests/src/Kernel/SerializationTest.php
index 8b700a3..06c73cb 100644
--- a/core/modules/serialization/tests/src/Kernel/SerializationTest.php
+++ b/core/modules/serialization/tests/src/Kernel/SerializationTest.php
@@ -17,7 +17,7 @@ class SerializationTest extends KernelTestBase {
    *
    * @var array
    */
-  public static $modules = array('serialization', 'serialization_test');
+  protected static $modules = array('serialization', 'serialization_test');
 
   /**
    * The serializer service to test.
diff --git a/core/modules/shortcut/tests/src/Kernel/Migrate/MigrateShortcutStubTest.php b/core/modules/shortcut/tests/src/Kernel/Migrate/MigrateShortcutStubTest.php
index f5b01d9..e52b327 100644
--- a/core/modules/shortcut/tests/src/Kernel/Migrate/MigrateShortcutStubTest.php
+++ b/core/modules/shortcut/tests/src/Kernel/Migrate/MigrateShortcutStubTest.php
@@ -17,7 +17,7 @@ class MigrateShortcutStubTest extends MigrateDrupalTestBase {
   /**
    * {@inheritdoc}
    */
-  public static $modules = ['shortcut', 'link'];
+  protected static $modules = ['shortcut', 'link'];
 
   /**
    * {@inheritdoc}
diff --git a/core/modules/shortcut/tests/src/Kernel/Migrate/d7/MigrateShortcutSetTest.php b/core/modules/shortcut/tests/src/Kernel/Migrate/d7/MigrateShortcutSetTest.php
index 8658286..ea554fe 100644
--- a/core/modules/shortcut/tests/src/Kernel/Migrate/d7/MigrateShortcutSetTest.php
+++ b/core/modules/shortcut/tests/src/Kernel/Migrate/d7/MigrateShortcutSetTest.php
@@ -18,7 +18,7 @@ class MigrateShortcutSetTest extends MigrateDrupal7TestBase {
    *
    * @var array
    */
-  public static $modules = array(
+  protected static $modules = array(
     'link',
     'field',
     'shortcut',
diff --git a/core/modules/shortcut/tests/src/Kernel/Migrate/d7/MigrateShortcutSetUsersTest.php b/core/modules/shortcut/tests/src/Kernel/Migrate/d7/MigrateShortcutSetUsersTest.php
index 1b15dcd..09ed181 100644
--- a/core/modules/shortcut/tests/src/Kernel/Migrate/d7/MigrateShortcutSetUsersTest.php
+++ b/core/modules/shortcut/tests/src/Kernel/Migrate/d7/MigrateShortcutSetUsersTest.php
@@ -17,7 +17,7 @@ class MigrateShortcutSetUsersTest extends MigrateDrupal7TestBase {
    *
    * @var array
    */
-  public static $modules = array(
+  protected static $modules = array(
     'link',
     'field',
     'shortcut',
diff --git a/core/modules/shortcut/tests/src/Kernel/Migrate/d7/MigrateShortcutTest.php b/core/modules/shortcut/tests/src/Kernel/Migrate/d7/MigrateShortcutTest.php
index 18f5517..9c0fddd 100644
--- a/core/modules/shortcut/tests/src/Kernel/Migrate/d7/MigrateShortcutTest.php
+++ b/core/modules/shortcut/tests/src/Kernel/Migrate/d7/MigrateShortcutTest.php
@@ -18,7 +18,7 @@ class MigrateShortcutTest extends MigrateDrupal7TestBase {
    *
    * @var array
    */
-  public static $modules = array(
+  protected static $modules = array(
     'link',
     'field',
     'shortcut',
diff --git a/core/modules/shortcut/tests/src/Kernel/Plugin/migrate/source/d7/ShortcutSetTest.php b/core/modules/shortcut/tests/src/Kernel/Plugin/migrate/source/d7/ShortcutSetTest.php
index e1982de..302f80d 100644
--- a/core/modules/shortcut/tests/src/Kernel/Plugin/migrate/source/d7/ShortcutSetTest.php
+++ b/core/modules/shortcut/tests/src/Kernel/Plugin/migrate/source/d7/ShortcutSetTest.php
@@ -16,7 +16,7 @@ class ShortcutSetTest extends MigrateSqlSourceTestBase {
   /**
    * {@inheritdoc}
    */
-  public static $modules = ['shortcut', 'migrate_drupal'];
+  protected static $modules = ['shortcut', 'migrate_drupal'];
 
   /**
    * {@inheritdoc}
diff --git a/core/modules/shortcut/tests/src/Kernel/Plugin/migrate/source/d7/ShortcutSetUsersTest.php b/core/modules/shortcut/tests/src/Kernel/Plugin/migrate/source/d7/ShortcutSetUsersTest.php
index 035aec3..5dc83f7 100644
--- a/core/modules/shortcut/tests/src/Kernel/Plugin/migrate/source/d7/ShortcutSetUsersTest.php
+++ b/core/modules/shortcut/tests/src/Kernel/Plugin/migrate/source/d7/ShortcutSetUsersTest.php
@@ -16,7 +16,7 @@ class ShortcutSetUsersTest extends MigrateSqlSourceTestBase {
   /**
    * {@inheritdoc}
    */
-  public static $modules = ['shortcut', 'migrate_drupal'];
+  protected static $modules = ['shortcut', 'migrate_drupal'];
 
   /**
    * {@inheritdoc}
diff --git a/core/modules/shortcut/tests/src/Kernel/Plugin/migrate/source/d7/ShortcutTest.php b/core/modules/shortcut/tests/src/Kernel/Plugin/migrate/source/d7/ShortcutTest.php
index 9f8fd3a..bc4651c 100644
--- a/core/modules/shortcut/tests/src/Kernel/Plugin/migrate/source/d7/ShortcutTest.php
+++ b/core/modules/shortcut/tests/src/Kernel/Plugin/migrate/source/d7/ShortcutTest.php
@@ -16,7 +16,7 @@ class ShortcutTest extends MigrateSqlSourceTestBase {
   /**
    * {@inheritdoc}
    */
-  public static $modules = ['shortcut', 'migrate_drupal'];
+  protected static $modules = ['shortcut', 'migrate_drupal'];
 
   /**
    * {@inheritdoc}
diff --git a/core/modules/shortcut/tests/src/Kernel/ShortcutSevenIntegrationTest.php b/core/modules/shortcut/tests/src/Kernel/ShortcutSevenIntegrationTest.php
index 0d58c31..2e43bf7 100644
--- a/core/modules/shortcut/tests/src/Kernel/ShortcutSevenIntegrationTest.php
+++ b/core/modules/shortcut/tests/src/Kernel/ShortcutSevenIntegrationTest.php
@@ -11,7 +11,7 @@
  */
 class ShortcutSevenIntegrationTest extends KernelTestBase {
 
-  public static $modules = ['system'];
+  protected static $modules = ['system'];
 
   /**
    * Tests shortcut_install() and shortcut_uninstall().
diff --git a/core/modules/simpletest/tests/src/Kernel/Migrate/d6/MigrateSimpletestConfigsTest.php b/core/modules/simpletest/tests/src/Kernel/Migrate/d6/MigrateSimpletestConfigsTest.php
index 6bac63a..6f5ec5d 100644
--- a/core/modules/simpletest/tests/src/Kernel/Migrate/d6/MigrateSimpletestConfigsTest.php
+++ b/core/modules/simpletest/tests/src/Kernel/Migrate/d6/MigrateSimpletestConfigsTest.php
@@ -17,7 +17,7 @@ class MigrateSimpletestConfigsTest extends MigrateDrupal6TestBase {
   /**
    * {@inheritdoc}
    */
-  public static $modules = array('simpletest');
+  protected static $modules = array('simpletest');
 
   /**
    * {@inheritdoc}
diff --git a/core/modules/simpletest/tests/src/Kernel/Migrate/d7/MigrateSimpletestSettingsTest.php b/core/modules/simpletest/tests/src/Kernel/Migrate/d7/MigrateSimpletestSettingsTest.php
index 6eba633..cc8bd1d 100644
--- a/core/modules/simpletest/tests/src/Kernel/Migrate/d7/MigrateSimpletestSettingsTest.php
+++ b/core/modules/simpletest/tests/src/Kernel/Migrate/d7/MigrateSimpletestSettingsTest.php
@@ -11,7 +11,7 @@
  */
 class MigrateSimpletestSettingsTest extends MigrateDrupal7TestBase {
 
-  public static $modules = ['simpletest'];
+  protected static $modules = ['simpletest'];
 
   /**
    * {@inheritdoc}
diff --git a/core/modules/statistics/tests/src/Kernel/Migrate/d6/MigrateStatisticsConfigsTest.php b/core/modules/statistics/tests/src/Kernel/Migrate/d6/MigrateStatisticsConfigsTest.php
index 401a5e8..d5b512d 100644
--- a/core/modules/statistics/tests/src/Kernel/Migrate/d6/MigrateStatisticsConfigsTest.php
+++ b/core/modules/statistics/tests/src/Kernel/Migrate/d6/MigrateStatisticsConfigsTest.php
@@ -17,7 +17,7 @@ class MigrateStatisticsConfigsTest extends MigrateDrupal6TestBase {
   /**
    * {@inheritdoc}
    */
-  public static $modules = array('statistics');
+  protected static $modules = array('statistics');
 
   /**
    * {@inheritdoc}
diff --git a/core/modules/statistics/tests/src/Kernel/Migrate/d7/MigrateStatisticsConfigsTest.php b/core/modules/statistics/tests/src/Kernel/Migrate/d7/MigrateStatisticsConfigsTest.php
index e5d3310..7117c7f 100644
--- a/core/modules/statistics/tests/src/Kernel/Migrate/d7/MigrateStatisticsConfigsTest.php
+++ b/core/modules/statistics/tests/src/Kernel/Migrate/d7/MigrateStatisticsConfigsTest.php
@@ -17,7 +17,7 @@ class MigrateStatisticsConfigsTest extends MigrateDrupal7TestBase {
   /**
    * {@inheritdoc}
    */
-  public static $modules = array('statistics');
+  protected static $modules = array('statistics');
 
   /**
    * {@inheritdoc}
diff --git a/core/modules/syslog/tests/src/Kernel/Migrate/d6/MigrateSyslogConfigsTest.php b/core/modules/syslog/tests/src/Kernel/Migrate/d6/MigrateSyslogConfigsTest.php
index f2bf8c9..87aa41b 100644
--- a/core/modules/syslog/tests/src/Kernel/Migrate/d6/MigrateSyslogConfigsTest.php
+++ b/core/modules/syslog/tests/src/Kernel/Migrate/d6/MigrateSyslogConfigsTest.php
@@ -17,7 +17,7 @@ class MigrateSyslogConfigsTest extends MigrateDrupal6TestBase {
   /**
    * {@inheritdoc}
    */
-  public static $modules = array('syslog');
+  protected static $modules = array('syslog');
 
   /**
    * {@inheritdoc}
diff --git a/core/modules/syslog/tests/src/Kernel/Migrate/d7/MigrateSyslogConfigsTest.php b/core/modules/syslog/tests/src/Kernel/Migrate/d7/MigrateSyslogConfigsTest.php
index e81b821..55f7d9f 100644
--- a/core/modules/syslog/tests/src/Kernel/Migrate/d7/MigrateSyslogConfigsTest.php
+++ b/core/modules/syslog/tests/src/Kernel/Migrate/d7/MigrateSyslogConfigsTest.php
@@ -19,7 +19,7 @@ class MigrateSyslogConfigsTest extends MigrateDrupal7TestBase {
    *
    * @var array
    */
-  public static $modules = ['syslog'];
+  protected static $modules = ['syslog'];
 
   /**
    * {@inheritdoc}
diff --git a/core/modules/system/tests/src/Functional/CsrfRequestHeaderTest.php b/core/modules/system/tests/src/Functional/CsrfRequestHeaderTest.php
index c6d7b35..9549763 100644
--- a/core/modules/system/tests/src/Functional/CsrfRequestHeaderTest.php
+++ b/core/modules/system/tests/src/Functional/CsrfRequestHeaderTest.php
@@ -18,7 +18,7 @@ class CsrfRequestHeaderTest extends BrowserTestBase {
    *
    * @var array
    */
-  public static $modules = ['system', 'csrf_test'];
+  protected static $modules = ['system', 'csrf_test'];
 
   /**
    * Tests access to routes protected by CSRF request header requirements.
diff --git a/core/modules/system/tests/src/Functional/Render/PlaceholderMessageTest.php b/core/modules/system/tests/src/Functional/Render/PlaceholderMessageTest.php
index 185ca49..0d7a1e9 100644
--- a/core/modules/system/tests/src/Functional/Render/PlaceholderMessageTest.php
+++ b/core/modules/system/tests/src/Functional/Render/PlaceholderMessageTest.php
@@ -17,7 +17,7 @@ class PlaceholderMessageTest extends BrowserTestBase {
    *
    * @var array
    */
-  public static $modules = ['render_placeholder_message_test'];
+  protected static $modules = ['render_placeholder_message_test'];
 
   /**
    * Test rendering of message placeholder.
diff --git a/core/modules/system/tests/src/Kernel/Action/ActionTest.php b/core/modules/system/tests/src/Kernel/Action/ActionTest.php
index 4ca24fb..bfc62ae 100644
--- a/core/modules/system/tests/src/Kernel/Action/ActionTest.php
+++ b/core/modules/system/tests/src/Kernel/Action/ActionTest.php
@@ -17,7 +17,7 @@ class ActionTest extends KernelTestBase {
   /**
    * {@inheritdoc}
    */
-  public static $modules = array('system', 'field', 'user', 'action_test');
+  protected static $modules = array('system', 'field', 'user', 'action_test');
 
   /**
    * The action manager.
diff --git a/core/modules/system/tests/src/Kernel/Block/SystemMenuBlockTest.php b/core/modules/system/tests/src/Kernel/Block/SystemMenuBlockTest.php
index ca1c5af..8026541 100644
--- a/core/modules/system/tests/src/Kernel/Block/SystemMenuBlockTest.php
+++ b/core/modules/system/tests/src/Kernel/Block/SystemMenuBlockTest.php
@@ -31,7 +31,7 @@ class SystemMenuBlockTest extends KernelTestBase {
    *
    * @var array
    */
-  public static $modules = array(
+  protected static $modules = array(
     'system',
     'block',
     'menu_test',
diff --git a/core/modules/system/tests/src/Kernel/Entity/EntityReferenceSelectionReferenceableTest.php b/core/modules/system/tests/src/Kernel/Entity/EntityReferenceSelectionReferenceableTest.php
index f7fa5d8..30041d3 100644
--- a/core/modules/system/tests/src/Kernel/Entity/EntityReferenceSelectionReferenceableTest.php
+++ b/core/modules/system/tests/src/Kernel/Entity/EntityReferenceSelectionReferenceableTest.php
@@ -42,7 +42,7 @@ class EntityReferenceSelectionReferenceableTest extends KernelTestBase {
   /**
    * {@inheritdoc}
    */
-  public static $modules = ['system', 'user', 'field', 'entity_reference', 'node', 'entity_test'];
+  protected static $modules = ['system', 'user', 'field', 'entity_reference', 'node', 'entity_test'];
 
   /**
    * {@inheritdoc}
diff --git a/core/modules/system/tests/src/Kernel/Extension/ModuleHandlerTest.php b/core/modules/system/tests/src/Kernel/Extension/ModuleHandlerTest.php
index 8a3e98ed..e2e9e81 100644
--- a/core/modules/system/tests/src/Kernel/Extension/ModuleHandlerTest.php
+++ b/core/modules/system/tests/src/Kernel/Extension/ModuleHandlerTest.php
@@ -17,7 +17,7 @@ class ModuleHandlerTest extends KernelTestBase {
   /**
    * {@inheritdoc}
    */
-  public static $modules = ['system'];
+  protected static $modules = ['system'];
 
   /**
    * {@inheritdoc}
diff --git a/core/modules/system/tests/src/Kernel/Form/FormElementLabelTest.php b/core/modules/system/tests/src/Kernel/Form/FormElementLabelTest.php
index 2bc895f..5a7992c 100644
--- a/core/modules/system/tests/src/Kernel/Form/FormElementLabelTest.php
+++ b/core/modules/system/tests/src/Kernel/Form/FormElementLabelTest.php
@@ -15,7 +15,7 @@ class FormElementLabelTest extends KernelTestBase {
   /**
    * {@inheritdoc}
    */
-  public static $modules = ['system'];
+  protected static $modules = ['system'];
 
   /**
    * Ensures that attributes can be placed for form element label.
diff --git a/core/modules/system/tests/src/Kernel/Installer/InstallerMissingDependenciesTest.php b/core/modules/system/tests/src/Kernel/Installer/InstallerMissingDependenciesTest.php
index 052c0af..226c5dc 100644
--- a/core/modules/system/tests/src/Kernel/Installer/InstallerMissingDependenciesTest.php
+++ b/core/modules/system/tests/src/Kernel/Installer/InstallerMissingDependenciesTest.php
@@ -14,7 +14,7 @@ class InstallerMissingDependenciesTest extends KernelTestBase {
   /**
    * {@inheritdoc}
    */
-  public static $modules = ['system'];
+  protected static $modules = ['system'];
 
   /**
    * Verifies that the exception message in the profile step is correct.
diff --git a/core/modules/system/tests/src/Kernel/Migrate/d7/MigrateSystemConfigurationTest.php b/core/modules/system/tests/src/Kernel/Migrate/d7/MigrateSystemConfigurationTest.php
index 59d7b01..d131ffa 100644
--- a/core/modules/system/tests/src/Kernel/Migrate/d7/MigrateSystemConfigurationTest.php
+++ b/core/modules/system/tests/src/Kernel/Migrate/d7/MigrateSystemConfigurationTest.php
@@ -11,7 +11,7 @@
  */
 class MigrateSystemConfigurationTest extends MigrateDrupal7TestBase {
 
-  public static $modules = ['action', 'file', 'system'];
+  protected static $modules = ['action', 'file', 'system'];
 
   protected $expectedConfig = [
     'system.authorize' => [
diff --git a/core/modules/system/tests/src/Kernel/Plugin/migrate/source/MenuTest.php b/core/modules/system/tests/src/Kernel/Plugin/migrate/source/MenuTest.php
index 0feb9a2..3917b37 100644
--- a/core/modules/system/tests/src/Kernel/Plugin/migrate/source/MenuTest.php
+++ b/core/modules/system/tests/src/Kernel/Plugin/migrate/source/MenuTest.php
@@ -16,7 +16,7 @@ class MenuTest extends MigrateSqlSourceTestBase {
   /**
    * {@inheritdoc}
    */
-  public static $modules = ['system', 'migrate_drupal'];
+  protected static $modules = ['system', 'migrate_drupal'];
 
   /**
    * {@inheritdoc}
diff --git a/core/modules/system/tests/src/Kernel/Render/ClassyTest.php b/core/modules/system/tests/src/Kernel/Render/ClassyTest.php
index 76cf23e..291d66a 100644
--- a/core/modules/system/tests/src/Kernel/Render/ClassyTest.php
+++ b/core/modules/system/tests/src/Kernel/Render/ClassyTest.php
@@ -14,7 +14,7 @@ class ClassyTest extends KernelTestBase {
   /**
    * {@inheritdoc}
    */
-  public static $modules = array('system', 'twig_theme_test');
+  protected static $modules = array('system', 'twig_theme_test');
 
   /**
    * {@inheritdoc}
diff --git a/core/modules/system/tests/src/Kernel/Scripts/DbDumpCommandTest.php b/core/modules/system/tests/src/Kernel/Scripts/DbDumpCommandTest.php
index a2ca864..3e6ec4c 100644
--- a/core/modules/system/tests/src/Kernel/Scripts/DbDumpCommandTest.php
+++ b/core/modules/system/tests/src/Kernel/Scripts/DbDumpCommandTest.php
@@ -17,7 +17,7 @@ class DbDumpCommandTest extends KernelTestBase {
   /**
    * {@inheritdoc}
    */
-  public static $modules = ['system'];
+  protected static $modules = ['system'];
 
   /**
    * {@inheritdoc}
diff --git a/core/modules/system/tests/src/Kernel/Scripts/DbImportCommandTest.php b/core/modules/system/tests/src/Kernel/Scripts/DbImportCommandTest.php
index c90d226..67c735a 100644
--- a/core/modules/system/tests/src/Kernel/Scripts/DbImportCommandTest.php
+++ b/core/modules/system/tests/src/Kernel/Scripts/DbImportCommandTest.php
@@ -17,7 +17,7 @@ class DbImportCommandTest extends KernelTestBase {
   /**
    * {@inheritdoc}
    */
-  public static $modules = ['system', 'config', 'dblog', 'menu_link_content', 'link', 'block_content', 'file', 'user'];
+  protected static $modules = ['system', 'config', 'dblog', 'menu_link_content', 'link', 'block_content', 'file', 'user'];
 
   /**
    * Tables that should be part of the exported script.
diff --git a/core/modules/system/tests/src/Kernel/System/CronQueueTest.php b/core/modules/system/tests/src/Kernel/System/CronQueueTest.php
index c51ee5a..f599f35 100644
--- a/core/modules/system/tests/src/Kernel/System/CronQueueTest.php
+++ b/core/modules/system/tests/src/Kernel/System/CronQueueTest.php
@@ -17,7 +17,7 @@ class CronQueueTest extends KernelTestBase {
    *
    * @var array
    */
-  public static $modules = ['system', 'cron_queue_test'];
+  protected static $modules = ['system', 'cron_queue_test'];
 
   /**
    * The database connection.
diff --git a/core/modules/system/tests/src/Kernel/System/InfoAlterTest.php b/core/modules/system/tests/src/Kernel/System/InfoAlterTest.php
index 8e6f79e..d30ba88 100644
--- a/core/modules/system/tests/src/Kernel/System/InfoAlterTest.php
+++ b/core/modules/system/tests/src/Kernel/System/InfoAlterTest.php
@@ -11,7 +11,7 @@
  */
 class InfoAlterTest extends KernelTestBase {
 
-  public static $modules = array('system');
+  protected static $modules = array('system');
 
   /**
    * Tests that theme .info.yml data is rebuild after enabling a module.
diff --git a/core/modules/system/tests/src/Kernel/Token/TokenReplaceKernelTestBase.php b/core/modules/system/tests/src/Kernel/Token/TokenReplaceKernelTestBase.php
index 0e2a3fc..784b20b 100644
--- a/core/modules/system/tests/src/Kernel/Token/TokenReplaceKernelTestBase.php
+++ b/core/modules/system/tests/src/Kernel/Token/TokenReplaceKernelTestBase.php
@@ -28,7 +28,7 @@
    *
    * @var array
    */
-  public static $modules = array('system');
+  protected static $modules = array('system');
 
   protected function setUp() {
     parent::setUp();
diff --git a/core/modules/taxonomy/tests/src/Functional/VocabularySerializationTest.php b/core/modules/taxonomy/tests/src/Functional/VocabularySerializationTest.php
index b9aba8a..16621b3 100644
--- a/core/modules/taxonomy/tests/src/Functional/VocabularySerializationTest.php
+++ b/core/modules/taxonomy/tests/src/Functional/VocabularySerializationTest.php
@@ -21,7 +21,7 @@ class VocabularySerializationTest extends BrowserTestBase {
   /**
    * {@inheritdoc}
    */
-  public static $modules = ['taxonomy', 'vocabulary_serialization_test'];
+  protected static $modules = ['taxonomy', 'vocabulary_serialization_test'];
 
   /**
    * {@inheritdoc}
diff --git a/core/modules/taxonomy/tests/src/Kernel/ForwardRevisionTest.php b/core/modules/taxonomy/tests/src/Kernel/ForwardRevisionTest.php
index abc0846..2f4e158 100644
--- a/core/modules/taxonomy/tests/src/Kernel/ForwardRevisionTest.php
+++ b/core/modules/taxonomy/tests/src/Kernel/ForwardRevisionTest.php
@@ -20,7 +20,7 @@ class ForwardRevisionTest extends KernelTestBase {
   /**
    * {@inheritdoc}
    */
-  public static $modules = ['taxonomy', 'node', 'user', 'text', 'field', 'system'];
+  protected static $modules = ['taxonomy', 'node', 'user', 'text', 'field', 'system'];
 
   /**
    * {@inheritdoc}
diff --git a/core/modules/taxonomy/tests/src/Kernel/Migrate/MigrateTaxonomyConfigsTest.php b/core/modules/taxonomy/tests/src/Kernel/Migrate/MigrateTaxonomyConfigsTest.php
index bff8830..31024d5 100644
--- a/core/modules/taxonomy/tests/src/Kernel/Migrate/MigrateTaxonomyConfigsTest.php
+++ b/core/modules/taxonomy/tests/src/Kernel/Migrate/MigrateTaxonomyConfigsTest.php
@@ -17,7 +17,7 @@ class MigrateTaxonomyConfigsTest extends MigrateDrupal6TestBase {
   /**
    * {@inheritdoc}
    */
-  public static $modules = array('taxonomy');
+  protected static $modules = array('taxonomy');
 
   /**
    * {@inheritdoc}
diff --git a/core/modules/taxonomy/tests/src/Kernel/Migrate/MigrateTaxonomyTermStubTest.php b/core/modules/taxonomy/tests/src/Kernel/Migrate/MigrateTaxonomyTermStubTest.php
index 2da51e4..1d340fc 100644
--- a/core/modules/taxonomy/tests/src/Kernel/Migrate/MigrateTaxonomyTermStubTest.php
+++ b/core/modules/taxonomy/tests/src/Kernel/Migrate/MigrateTaxonomyTermStubTest.php
@@ -20,7 +20,7 @@ class MigrateTaxonomyTermStubTest extends MigrateDrupalTestBase {
   /**
    * {@inheritdoc}
    */
-  public static $modules = ['taxonomy', 'text', 'taxonomy_term_stub_test'];
+  protected static $modules = ['taxonomy', 'text', 'taxonomy_term_stub_test'];
 
   /**
    * {@inheritdoc}
diff --git a/core/modules/taxonomy/tests/src/Kernel/Migrate/d6/MigrateTaxonomyTermTest.php b/core/modules/taxonomy/tests/src/Kernel/Migrate/d6/MigrateTaxonomyTermTest.php
index b0311f3..99992d0 100644
--- a/core/modules/taxonomy/tests/src/Kernel/Migrate/d6/MigrateTaxonomyTermTest.php
+++ b/core/modules/taxonomy/tests/src/Kernel/Migrate/d6/MigrateTaxonomyTermTest.php
@@ -15,7 +15,7 @@ class MigrateTaxonomyTermTest extends MigrateDrupal6TestBase {
   /**
    * {@inheritdoc}
    */
-  public static $modules = array('taxonomy');
+  protected static $modules = array('taxonomy');
 
   /**
    * {@inheritdoc}
diff --git a/core/modules/taxonomy/tests/src/Kernel/Migrate/d6/MigrateTaxonomyVocabularyTest.php b/core/modules/taxonomy/tests/src/Kernel/Migrate/d6/MigrateTaxonomyVocabularyTest.php
index c2d4ab6..0b69c7b 100644
--- a/core/modules/taxonomy/tests/src/Kernel/Migrate/d6/MigrateTaxonomyVocabularyTest.php
+++ b/core/modules/taxonomy/tests/src/Kernel/Migrate/d6/MigrateTaxonomyVocabularyTest.php
@@ -15,7 +15,7 @@ class MigrateTaxonomyVocabularyTest extends MigrateDrupal6TestBase {
   /**
    * {@inheritdoc}
    */
-  public static $modules = array('taxonomy');
+  protected static $modules = array('taxonomy');
 
   /**
    * {@inheritdoc}
diff --git a/core/modules/taxonomy/tests/src/Kernel/Migrate/d6/MigrateTermNodeRevisionTest.php b/core/modules/taxonomy/tests/src/Kernel/Migrate/d6/MigrateTermNodeRevisionTest.php
index facd69b..4887fa7 100644
--- a/core/modules/taxonomy/tests/src/Kernel/Migrate/d6/MigrateTermNodeRevisionTest.php
+++ b/core/modules/taxonomy/tests/src/Kernel/Migrate/d6/MigrateTermNodeRevisionTest.php
@@ -14,7 +14,7 @@ class MigrateTermNodeRevisionTest extends MigrateDrupal6TestBase {
   /**
    * {@inheritdoc}
    */
-  public static $modules = ['taxonomy'];
+  protected static $modules = ['taxonomy'];
 
   /**
    * {@inheritdoc}
diff --git a/core/modules/taxonomy/tests/src/Kernel/Migrate/d6/MigrateTermNodeTest.php b/core/modules/taxonomy/tests/src/Kernel/Migrate/d6/MigrateTermNodeTest.php
index 26f069c..fed429f 100644
--- a/core/modules/taxonomy/tests/src/Kernel/Migrate/d6/MigrateTermNodeTest.php
+++ b/core/modules/taxonomy/tests/src/Kernel/Migrate/d6/MigrateTermNodeTest.php
@@ -15,7 +15,7 @@ class MigrateTermNodeTest extends MigrateDrupal6TestBase {
   /**
    * {@inheritdoc}
    */
-  public static $modules = ['taxonomy'];
+  protected static $modules = ['taxonomy'];
 
   /**
    * {@inheritdoc}
diff --git a/core/modules/taxonomy/tests/src/Kernel/Migrate/d6/MigrateVocabularyEntityDisplayTest.php b/core/modules/taxonomy/tests/src/Kernel/Migrate/d6/MigrateVocabularyEntityDisplayTest.php
index 42f864e..c011060 100644
--- a/core/modules/taxonomy/tests/src/Kernel/Migrate/d6/MigrateVocabularyEntityDisplayTest.php
+++ b/core/modules/taxonomy/tests/src/Kernel/Migrate/d6/MigrateVocabularyEntityDisplayTest.php
@@ -15,7 +15,7 @@ class MigrateVocabularyEntityDisplayTest extends MigrateDrupal6TestBase {
   /**
    * {@inheritdoc}
    */
-  public static $modules = ['field', 'taxonomy'];
+  protected static $modules = ['field', 'taxonomy'];
 
   /**
    * {@inheritdoc}
diff --git a/core/modules/taxonomy/tests/src/Kernel/Migrate/d6/MigrateVocabularyEntityFormDisplayTest.php b/core/modules/taxonomy/tests/src/Kernel/Migrate/d6/MigrateVocabularyEntityFormDisplayTest.php
index a2e26c7..90cca36 100644
--- a/core/modules/taxonomy/tests/src/Kernel/Migrate/d6/MigrateVocabularyEntityFormDisplayTest.php
+++ b/core/modules/taxonomy/tests/src/Kernel/Migrate/d6/MigrateVocabularyEntityFormDisplayTest.php
@@ -15,7 +15,7 @@ class MigrateVocabularyEntityFormDisplayTest extends MigrateDrupal6TestBase {
   /**
    * {@inheritdoc}
    */
-  public static $modules = ['taxonomy'];
+  protected static $modules = ['taxonomy'];
 
   /**
    * {@inheritdoc}
diff --git a/core/modules/taxonomy/tests/src/Kernel/Migrate/d6/MigrateVocabularyFieldInstanceTest.php b/core/modules/taxonomy/tests/src/Kernel/Migrate/d6/MigrateVocabularyFieldInstanceTest.php
index 2534c3e..3c968b2 100644
--- a/core/modules/taxonomy/tests/src/Kernel/Migrate/d6/MigrateVocabularyFieldInstanceTest.php
+++ b/core/modules/taxonomy/tests/src/Kernel/Migrate/d6/MigrateVocabularyFieldInstanceTest.php
@@ -15,7 +15,7 @@ class MigrateVocabularyFieldInstanceTest extends MigrateDrupal6TestBase {
   /**
    * {@inheritdoc}
    */
-  public static $modules = ['taxonomy'];
+  protected static $modules = ['taxonomy'];
 
   /**
    * {@inheritdoc}
diff --git a/core/modules/taxonomy/tests/src/Kernel/Migrate/d6/MigrateVocabularyFieldTest.php b/core/modules/taxonomy/tests/src/Kernel/Migrate/d6/MigrateVocabularyFieldTest.php
index eb0c480..34ed480 100644
--- a/core/modules/taxonomy/tests/src/Kernel/Migrate/d6/MigrateVocabularyFieldTest.php
+++ b/core/modules/taxonomy/tests/src/Kernel/Migrate/d6/MigrateVocabularyFieldTest.php
@@ -15,7 +15,7 @@ class MigrateVocabularyFieldTest extends MigrateDrupal6TestBase {
   /**
    * {@inheritdoc}
    */
-  public static $modules = ['taxonomy'];
+  protected static $modules = ['taxonomy'];
 
   /**
    * {@inheritdoc}
diff --git a/core/modules/taxonomy/tests/src/Kernel/Migrate/d7/MigrateNodeTaxonomyTest.php b/core/modules/taxonomy/tests/src/Kernel/Migrate/d7/MigrateNodeTaxonomyTest.php
index d57e334..fac8890 100644
--- a/core/modules/taxonomy/tests/src/Kernel/Migrate/d7/MigrateNodeTaxonomyTest.php
+++ b/core/modules/taxonomy/tests/src/Kernel/Migrate/d7/MigrateNodeTaxonomyTest.php
@@ -14,7 +14,7 @@
  */
 class MigrateNodeTaxonomyTest extends MigrateDrupal7TestBase {
 
-  public static $modules = array(
+  protected static $modules = array(
     'datetime',
     'field',
     'filter',
diff --git a/core/modules/taxonomy/tests/src/Kernel/Migrate/d7/MigrateTaxonomyTermTest.php b/core/modules/taxonomy/tests/src/Kernel/Migrate/d7/MigrateTaxonomyTermTest.php
index c7e7828..2c09c18 100644
--- a/core/modules/taxonomy/tests/src/Kernel/Migrate/d7/MigrateTaxonomyTermTest.php
+++ b/core/modules/taxonomy/tests/src/Kernel/Migrate/d7/MigrateTaxonomyTermTest.php
@@ -13,7 +13,7 @@
  */
 class MigrateTaxonomyTermTest extends MigrateDrupal7TestBase {
 
-  public static $modules = array('taxonomy', 'text');
+  protected static $modules = array('taxonomy', 'text');
 
   /**
    * The cached taxonomy tree items, keyed by vid and tid.
diff --git a/core/modules/taxonomy/tests/src/Kernel/Migrate/d7/MigrateTaxonomyVocabularyTest.php b/core/modules/taxonomy/tests/src/Kernel/Migrate/d7/MigrateTaxonomyVocabularyTest.php
index 3f29fbf..f0af897 100644
--- a/core/modules/taxonomy/tests/src/Kernel/Migrate/d7/MigrateTaxonomyVocabularyTest.php
+++ b/core/modules/taxonomy/tests/src/Kernel/Migrate/d7/MigrateTaxonomyVocabularyTest.php
@@ -16,7 +16,7 @@ class MigrateTaxonomyVocabularyTest extends MigrateDrupal7TestBase {
   /**
    * {@inheritdoc}
    */
-  public static $modules = array('taxonomy');
+  protected static $modules = array('taxonomy');
 
   /**
    * {@inheritdoc}
diff --git a/core/modules/taxonomy/tests/src/Kernel/Plugin/migrate/source/TermSourceWithVocabularyFilterTest.php b/core/modules/taxonomy/tests/src/Kernel/Plugin/migrate/source/TermSourceWithVocabularyFilterTest.php
index 4ac2766..6706a60 100644
--- a/core/modules/taxonomy/tests/src/Kernel/Plugin/migrate/source/TermSourceWithVocabularyFilterTest.php
+++ b/core/modules/taxonomy/tests/src/Kernel/Plugin/migrate/source/TermSourceWithVocabularyFilterTest.php
@@ -13,7 +13,7 @@ class TermSourceWithVocabularyFilterTest extends TermTest {
   /**
    * {@inheritdoc}
    */
-  public static $modules = ['taxonomy', 'migrate_drupal'];
+  protected static $modules = ['taxonomy', 'migrate_drupal'];
 
   /**
    * {@inheritdoc}
diff --git a/core/modules/taxonomy/tests/src/Kernel/Plugin/migrate/source/TermTest.php b/core/modules/taxonomy/tests/src/Kernel/Plugin/migrate/source/TermTest.php
index bdffcf8..a461b0d 100644
--- a/core/modules/taxonomy/tests/src/Kernel/Plugin/migrate/source/TermTest.php
+++ b/core/modules/taxonomy/tests/src/Kernel/Plugin/migrate/source/TermTest.php
@@ -15,7 +15,7 @@ class TermTest extends MigrateSqlSourceTestBase {
   /**
    * {@inheritdoc}
    */
-  public static $modules = ['taxonomy', 'migrate_drupal'];
+  protected static $modules = ['taxonomy', 'migrate_drupal'];
 
   /**
    * {@inheritdoc}
diff --git a/core/modules/taxonomy/tests/src/Kernel/Plugin/migrate/source/d6/TermNodeTest.php b/core/modules/taxonomy/tests/src/Kernel/Plugin/migrate/source/d6/TermNodeTest.php
index 3084acf..16a365a 100644
--- a/core/modules/taxonomy/tests/src/Kernel/Plugin/migrate/source/d6/TermNodeTest.php
+++ b/core/modules/taxonomy/tests/src/Kernel/Plugin/migrate/source/d6/TermNodeTest.php
@@ -15,7 +15,7 @@ class TermNodeTest extends MigrateSqlSourceTestBase {
   /**
    * {@inheritdoc}
    */
-  public static $modules = ['taxonomy', 'migrate_drupal'];
+  protected static $modules = ['taxonomy', 'migrate_drupal'];
 
   /**
    * {@inheritdoc}
diff --git a/core/modules/taxonomy/tests/src/Kernel/Plugin/migrate/source/d6/VocabularyTest.php b/core/modules/taxonomy/tests/src/Kernel/Plugin/migrate/source/d6/VocabularyTest.php
index a98b298..4b81b6c 100644
--- a/core/modules/taxonomy/tests/src/Kernel/Plugin/migrate/source/d6/VocabularyTest.php
+++ b/core/modules/taxonomy/tests/src/Kernel/Plugin/migrate/source/d6/VocabularyTest.php
@@ -16,7 +16,7 @@ class VocabularyTest extends MigrateSqlSourceTestBase {
   /**
    * {@inheritdoc}
    */
-  public static $modules = ['taxonomy', 'migrate_drupal'];
+  protected static $modules = ['taxonomy', 'migrate_drupal'];
 
   /**
    * {@inheritdoc}
diff --git a/core/modules/taxonomy/tests/src/Kernel/Plugin/migrate/source/d7/VocabularyTest.php b/core/modules/taxonomy/tests/src/Kernel/Plugin/migrate/source/d7/VocabularyTest.php
index 4d1975c..fb78c54 100644
--- a/core/modules/taxonomy/tests/src/Kernel/Plugin/migrate/source/d7/VocabularyTest.php
+++ b/core/modules/taxonomy/tests/src/Kernel/Plugin/migrate/source/d7/VocabularyTest.php
@@ -15,7 +15,7 @@ class VocabularyTest extends MigrateSqlSourceTestBase {
   /**
    * {@inheritdoc}
    */
-  public static $modules = ['taxonomy', 'migrate_drupal'];
+  protected static $modules = ['taxonomy', 'migrate_drupal'];
 
   /**
    * {@inheritdoc}
diff --git a/core/modules/taxonomy/tests/src/Kernel/TermKernelTest.php b/core/modules/taxonomy/tests/src/Kernel/TermKernelTest.php
index 1e2b232..96d5767 100644
--- a/core/modules/taxonomy/tests/src/Kernel/TermKernelTest.php
+++ b/core/modules/taxonomy/tests/src/Kernel/TermKernelTest.php
@@ -18,7 +18,7 @@ class TermKernelTest extends KernelTestBase {
   /**
    * {@inheritdoc}
    */
-  public static $modules = array( 'filter', 'taxonomy', 'text', 'user' );
+  protected static $modules = array( 'filter', 'taxonomy', 'text', 'user' );
 
   /**
    * {@inheritdoc}
diff --git a/core/modules/taxonomy/tests/src/Kernel/TermValidationTest.php b/core/modules/taxonomy/tests/src/Kernel/TermValidationTest.php
index 3d9cfb7..5dc4d44 100644
--- a/core/modules/taxonomy/tests/src/Kernel/TermValidationTest.php
+++ b/core/modules/taxonomy/tests/src/Kernel/TermValidationTest.php
@@ -16,7 +16,7 @@ class TermValidationTest extends EntityKernelTestBase {
    *
    * @var array
    */
-  public static $modules = array('taxonomy');
+  protected static $modules = array('taxonomy');
 
   /**
    * {@inheritdoc}
diff --git a/core/modules/taxonomy/tests/src/Kernel/Views/TaxonomyViewsFieldAccessTest.php b/core/modules/taxonomy/tests/src/Kernel/Views/TaxonomyViewsFieldAccessTest.php
index e62232b..2d7b960 100644
--- a/core/modules/taxonomy/tests/src/Kernel/Views/TaxonomyViewsFieldAccessTest.php
+++ b/core/modules/taxonomy/tests/src/Kernel/Views/TaxonomyViewsFieldAccessTest.php
@@ -16,7 +16,7 @@ class TaxonomyViewsFieldAccessTest extends FieldFieldAccessTestBase {
   /**
    * {@inheritdoc}
    */
-  public static $modules = ['taxonomy', 'text', 'entity_test'];
+  protected static $modules = ['taxonomy', 'text', 'entity_test'];
 
   /**
    * {@inheritdoc}
diff --git a/core/modules/telephone/tests/src/Kernel/TelephoneItemTest.php b/core/modules/telephone/tests/src/Kernel/TelephoneItemTest.php
index 7f94ba3..50b739f 100644
--- a/core/modules/telephone/tests/src/Kernel/TelephoneItemTest.php
+++ b/core/modules/telephone/tests/src/Kernel/TelephoneItemTest.php
@@ -21,7 +21,7 @@ class TelephoneItemTest extends FieldKernelTestBase {
    *
    * @var array
    */
-  public static $modules = array('telephone');
+  protected static $modules = array('telephone');
 
   protected function setUp() {
     parent::setUp();
diff --git a/core/modules/text/tests/src/Kernel/TextFormatterTest.php b/core/modules/text/tests/src/Kernel/TextFormatterTest.php
index 747a06f..d6e62cc 100644
--- a/core/modules/text/tests/src/Kernel/TextFormatterTest.php
+++ b/core/modules/text/tests/src/Kernel/TextFormatterTest.php
@@ -33,7 +33,7 @@ class TextFormatterTest extends EntityKernelTestBase {
    *
    * @var array
    */
-  public static $modules = array('text');
+  protected static $modules = array('text');
 
   /**
    * {@inheritdoc}
diff --git a/core/modules/text/tests/src/Kernel/TextSummaryTest.php b/core/modules/text/tests/src/Kernel/TextSummaryTest.php
index abc0b68..e7b60e1 100644
--- a/core/modules/text/tests/src/Kernel/TextSummaryTest.php
+++ b/core/modules/text/tests/src/Kernel/TextSummaryTest.php
@@ -12,7 +12,7 @@
  */
 class TextSummaryTest extends KernelTestBase {
 
-  public static $modules = array('system', 'user', 'filter', 'text');
+  protected static $modules = array('system', 'user', 'filter', 'text');
 
   protected function setUp() {
     parent::setUp();
diff --git a/core/modules/text/tests/src/Kernel/TextWithSummaryItemTest.php b/core/modules/text/tests/src/Kernel/TextWithSummaryItemTest.php
index fc02daa..eb48fe9 100644
--- a/core/modules/text/tests/src/Kernel/TextWithSummaryItemTest.php
+++ b/core/modules/text/tests/src/Kernel/TextWithSummaryItemTest.php
@@ -21,7 +21,7 @@ class TextWithSummaryItemTest extends FieldKernelTestBase {
    *
    * @var array
    */
-  public static $modules = array('filter');
+  protected static $modules = array('filter');
 
   /**
    * Field storage entity.
diff --git a/core/modules/toolbar/tests/src/FunctionalJavascript/ToolbarIntegrationTest.php b/core/modules/toolbar/tests/src/FunctionalJavascript/ToolbarIntegrationTest.php
index c3b3d9a..2d05cfa 100644
--- a/core/modules/toolbar/tests/src/FunctionalJavascript/ToolbarIntegrationTest.php
+++ b/core/modules/toolbar/tests/src/FunctionalJavascript/ToolbarIntegrationTest.php
@@ -14,7 +14,7 @@ class ToolbarIntegrationTest extends JavascriptTestBase {
   /**
    * {@inheritdoc}
    */
-  public static $modules = ['toolbar', 'node'];
+  protected static $modules = ['toolbar', 'node'];
 
   /**
    * Tests if the toolbar can be toggled with JavaScript.
diff --git a/core/modules/tour/tests/src/Kernel/TourPluginTest.php b/core/modules/tour/tests/src/Kernel/TourPluginTest.php
index 9278e2e..fb654b0 100644
--- a/core/modules/tour/tests/src/Kernel/TourPluginTest.php
+++ b/core/modules/tour/tests/src/Kernel/TourPluginTest.php
@@ -16,7 +16,7 @@ class TourPluginTest extends KernelTestBase {
    *
    * @var array
    */
-  public static $modules = array('tour');
+  protected static $modules = array('tour');
 
   /**
    * Stores the tour plugin manager.
diff --git a/core/modules/tracker/tests/src/Kernel/Migrate/d7/MigrateTrackerNodeTest.php b/core/modules/tracker/tests/src/Kernel/Migrate/d7/MigrateTrackerNodeTest.php
index d72f13d..b2f9de5 100644
--- a/core/modules/tracker/tests/src/Kernel/Migrate/d7/MigrateTrackerNodeTest.php
+++ b/core/modules/tracker/tests/src/Kernel/Migrate/d7/MigrateTrackerNodeTest.php
@@ -15,7 +15,7 @@ class MigrateTrackerNodeTest extends MigrateDrupal7TestBase {
   /**
    * {@inheritdoc}
    */
-  public static $modules = [
+  protected static $modules = [
     'node',
     'text',
     'tracker',
diff --git a/core/modules/tracker/tests/src/Kernel/Migrate/d7/MigrateTrackerSettingsTest.php b/core/modules/tracker/tests/src/Kernel/Migrate/d7/MigrateTrackerSettingsTest.php
index ea97322..552774b 100644
--- a/core/modules/tracker/tests/src/Kernel/Migrate/d7/MigrateTrackerSettingsTest.php
+++ b/core/modules/tracker/tests/src/Kernel/Migrate/d7/MigrateTrackerSettingsTest.php
@@ -11,7 +11,7 @@
  */
 class MigrateTrackerSettingsTest extends MigrateDrupal7TestBase {
 
-  public static $modules = ['tracker'];
+  protected static $modules = ['tracker'];
 
   /**
    * {@inheritdoc}
diff --git a/core/modules/tracker/tests/src/Kernel/Migrate/d7/MigrateTrackerUserTest.php b/core/modules/tracker/tests/src/Kernel/Migrate/d7/MigrateTrackerUserTest.php
index e3ed88e..3e9fa20 100644
--- a/core/modules/tracker/tests/src/Kernel/Migrate/d7/MigrateTrackerUserTest.php
+++ b/core/modules/tracker/tests/src/Kernel/Migrate/d7/MigrateTrackerUserTest.php
@@ -15,7 +15,7 @@ class MigrateTrackerUserTest extends MigrateDrupal7TestBase {
   /**
    * {@inheritdoc}
    */
-  public static $modules = [
+  protected static $modules = [
     'node',
     'text',
     'tracker',
diff --git a/core/modules/tracker/tests/src/Kernel/Plugin/migrate/source/d7/TrackerNodeTest.php b/core/modules/tracker/tests/src/Kernel/Plugin/migrate/source/d7/TrackerNodeTest.php
index 0318b8e..3457c8f 100644
--- a/core/modules/tracker/tests/src/Kernel/Plugin/migrate/source/d7/TrackerNodeTest.php
+++ b/core/modules/tracker/tests/src/Kernel/Plugin/migrate/source/d7/TrackerNodeTest.php
@@ -16,7 +16,7 @@ class TrackerNodeTest extends MigrateSqlSourceTestBase {
   /**
   * {@inheritdoc}
   */
-  public static $modules = ['tracker', 'migrate_drupal'];
+  protected static $modules = ['tracker', 'migrate_drupal'];
 
   /**
   * {@inheritdoc}
diff --git a/core/modules/tracker/tests/src/Kernel/Plugin/migrate/source/d7/TrackerUserTest.php b/core/modules/tracker/tests/src/Kernel/Plugin/migrate/source/d7/TrackerUserTest.php
index ffcee93..8612cfa 100644
--- a/core/modules/tracker/tests/src/Kernel/Plugin/migrate/source/d7/TrackerUserTest.php
+++ b/core/modules/tracker/tests/src/Kernel/Plugin/migrate/source/d7/TrackerUserTest.php
@@ -16,7 +16,7 @@ class TrackerUserTest extends MigrateSqlSourceTestBase {
   /**
   * {@inheritdoc}
   */
-  public static $modules = ['tracker', 'migrate_drupal'];
+  protected static $modules = ['tracker', 'migrate_drupal'];
 
   /**
   * {@inheritdoc}
diff --git a/core/modules/update/tests/src/Kernel/Migrate/d6/MigrateUpdateConfigsTest.php b/core/modules/update/tests/src/Kernel/Migrate/d6/MigrateUpdateConfigsTest.php
index a022206..4e87c8d 100644
--- a/core/modules/update/tests/src/Kernel/Migrate/d6/MigrateUpdateConfigsTest.php
+++ b/core/modules/update/tests/src/Kernel/Migrate/d6/MigrateUpdateConfigsTest.php
@@ -17,7 +17,7 @@ class MigrateUpdateConfigsTest extends MigrateDrupal6TestBase {
   /**
    * {@inheritdoc}
    */
-  public static $modules = array('update');
+  protected static $modules = array('update');
 
   /**
    * {@inheritdoc}
diff --git a/core/modules/user/tests/src/Kernel/Condition/UserRoleConditionTest.php b/core/modules/user/tests/src/Kernel/Condition/UserRoleConditionTest.php
index 6e55364..53feb37 100644
--- a/core/modules/user/tests/src/Kernel/Condition/UserRoleConditionTest.php
+++ b/core/modules/user/tests/src/Kernel/Condition/UserRoleConditionTest.php
@@ -48,7 +48,7 @@ class UserRoleConditionTest extends KernelTestBase {
    *
    * @var array
    */
-  public static $modules = array('system', 'user', 'field');
+  protected static $modules = array('system', 'user', 'field');
 
   /**
    * {@inheritdoc}
diff --git a/core/modules/user/tests/src/Kernel/Field/UserNameFormatterTest.php b/core/modules/user/tests/src/Kernel/Field/UserNameFormatterTest.php
index 6beecb8..e91f4fe 100644
--- a/core/modules/user/tests/src/Kernel/Field/UserNameFormatterTest.php
+++ b/core/modules/user/tests/src/Kernel/Field/UserNameFormatterTest.php
@@ -19,7 +19,7 @@ class UserNameFormatterTest extends KernelTestBase {
    *
    * @var array
    */
-  public static $modules = ['field', 'user', 'system'];
+  protected static $modules = ['field', 'user', 'system'];
 
   /**
    * @var string
diff --git a/core/modules/user/tests/src/Kernel/Migrate/MigrateUserAdminPassTest.php b/core/modules/user/tests/src/Kernel/Migrate/MigrateUserAdminPassTest.php
index 85cd761..a54f797 100644
--- a/core/modules/user/tests/src/Kernel/Migrate/MigrateUserAdminPassTest.php
+++ b/core/modules/user/tests/src/Kernel/Migrate/MigrateUserAdminPassTest.php
@@ -24,7 +24,7 @@ class MigrateUserAdminPassTest extends MigrateTestBase {
    *
    * @var string[]
    */
-  public static $modules = ['user'];
+  protected static $modules = ['user'];
 
   /**
    * {@inheritdoc}
diff --git a/core/modules/user/tests/src/Kernel/Migrate/MigrateUserPictureEntityDisplayTest.php b/core/modules/user/tests/src/Kernel/Migrate/MigrateUserPictureEntityDisplayTest.php
index 0d3bb7c..8a4f1a1 100644
--- a/core/modules/user/tests/src/Kernel/Migrate/MigrateUserPictureEntityDisplayTest.php
+++ b/core/modules/user/tests/src/Kernel/Migrate/MigrateUserPictureEntityDisplayTest.php
@@ -15,7 +15,7 @@ class MigrateUserPictureEntityDisplayTest extends MigrateDrupal7TestBase {
   /**
    * {@inheritdoc}
    */
-  public static $modules = ['file', 'image'];
+  protected static $modules = ['file', 'image'];
 
   /**
    * {@inheritdoc}
diff --git a/core/modules/user/tests/src/Kernel/Migrate/MigrateUserPictureEntityFormDisplayTest.php b/core/modules/user/tests/src/Kernel/Migrate/MigrateUserPictureEntityFormDisplayTest.php
index f753824..f501012 100644
--- a/core/modules/user/tests/src/Kernel/Migrate/MigrateUserPictureEntityFormDisplayTest.php
+++ b/core/modules/user/tests/src/Kernel/Migrate/MigrateUserPictureEntityFormDisplayTest.php
@@ -12,7 +12,7 @@
  */
 class MigrateUserPictureEntityFormDisplayTest extends MigrateDrupal7TestBase {
 
-  public static $modules = ['image', 'file'];
+  protected static $modules = ['image', 'file'];
 
   /**
    * {@inheritdoc}
diff --git a/core/modules/user/tests/src/Kernel/Migrate/MigrateUserPictureFieldInstanceTest.php b/core/modules/user/tests/src/Kernel/Migrate/MigrateUserPictureFieldInstanceTest.php
index 9b3829e..e9a8e62 100644
--- a/core/modules/user/tests/src/Kernel/Migrate/MigrateUserPictureFieldInstanceTest.php
+++ b/core/modules/user/tests/src/Kernel/Migrate/MigrateUserPictureFieldInstanceTest.php
@@ -13,7 +13,7 @@
  */
 class MigrateUserPictureFieldInstanceTest extends MigrateDrupal7TestBase {
 
-  public static $modules = ['image', 'file'];
+  protected static $modules = ['image', 'file'];
 
   /**
    * {@inheritdoc}
diff --git a/core/modules/user/tests/src/Kernel/Migrate/MigrateUserPictureFieldTest.php b/core/modules/user/tests/src/Kernel/Migrate/MigrateUserPictureFieldTest.php
index 1389693..fac8122 100644
--- a/core/modules/user/tests/src/Kernel/Migrate/MigrateUserPictureFieldTest.php
+++ b/core/modules/user/tests/src/Kernel/Migrate/MigrateUserPictureFieldTest.php
@@ -13,7 +13,7 @@
  */
 class MigrateUserPictureFieldTest extends MigrateDrupal7TestBase {
 
-  public static $modules = ['image', 'file'];
+  protected static $modules = ['image', 'file'];
 
   /**
    * {@inheritdoc}
diff --git a/core/modules/user/tests/src/Kernel/Migrate/MigrateUserProfileFieldInstanceTest.php b/core/modules/user/tests/src/Kernel/Migrate/MigrateUserProfileFieldInstanceTest.php
index 9713332..0625c70 100644
--- a/core/modules/user/tests/src/Kernel/Migrate/MigrateUserProfileFieldInstanceTest.php
+++ b/core/modules/user/tests/src/Kernel/Migrate/MigrateUserProfileFieldInstanceTest.php
@@ -15,7 +15,7 @@ class MigrateUserProfileFieldInstanceTest extends MigrateDrupal6TestBase {
   /**
    * {@inheritdoc}
    */
-  public static $modules = ['field'];
+  protected static $modules = ['field'];
 
   /**
    * {@inheritdoc}
diff --git a/core/modules/user/tests/src/Kernel/Migrate/MigrateUserStubTest.php b/core/modules/user/tests/src/Kernel/Migrate/MigrateUserStubTest.php
index 768f5d7..3c25c70 100644
--- a/core/modules/user/tests/src/Kernel/Migrate/MigrateUserStubTest.php
+++ b/core/modules/user/tests/src/Kernel/Migrate/MigrateUserStubTest.php
@@ -17,7 +17,7 @@ class MigrateUserStubTest extends MigrateDrupalTestBase {
   /**
    * {@inheritdoc}
    */
-  public static $modules = ['user'];
+  protected static $modules = ['user'];
 
   /**
    * {@inheritdoc}
diff --git a/core/modules/user/tests/src/Kernel/Migrate/d6/MigrateUserContactSettingsTest.php b/core/modules/user/tests/src/Kernel/Migrate/d6/MigrateUserContactSettingsTest.php
index fcdaa25..b1e3ac11 100644
--- a/core/modules/user/tests/src/Kernel/Migrate/d6/MigrateUserContactSettingsTest.php
+++ b/core/modules/user/tests/src/Kernel/Migrate/d6/MigrateUserContactSettingsTest.php
@@ -14,7 +14,7 @@ class MigrateUserContactSettingsTest extends MigrateDrupal6TestBase {
   /**
    * {@inheritdoc}
    */
-  public static $modules = ['contact'];
+  protected static $modules = ['contact'];
 
   /**
    * {@inheritdoc}
diff --git a/core/modules/user/tests/src/Kernel/Migrate/d6/MigrateUserProfileValuesTest.php b/core/modules/user/tests/src/Kernel/Migrate/d6/MigrateUserProfileValuesTest.php
index e734517..9452341 100644
--- a/core/modules/user/tests/src/Kernel/Migrate/d6/MigrateUserProfileValuesTest.php
+++ b/core/modules/user/tests/src/Kernel/Migrate/d6/MigrateUserProfileValuesTest.php
@@ -15,7 +15,7 @@ class MigrateUserProfileValuesTest extends MigrateDrupal6TestBase {
   /**
    * {@inheritdoc}
    */
-  public static $modules = ['language'];
+  protected static $modules = ['language'];
 
   /**
    * {@inheritdoc}
diff --git a/core/modules/user/tests/src/Kernel/Migrate/d6/MigrateUserTest.php b/core/modules/user/tests/src/Kernel/Migrate/d6/MigrateUserTest.php
index 33952d1..8592a39 100644
--- a/core/modules/user/tests/src/Kernel/Migrate/d6/MigrateUserTest.php
+++ b/core/modules/user/tests/src/Kernel/Migrate/d6/MigrateUserTest.php
@@ -22,7 +22,7 @@ class MigrateUserTest extends MigrateDrupal6TestBase {
   /**
    * {@inheritdoc}
    */
-  public static $modules = ['language'];
+  protected static $modules = ['language'];
 
   /**
    * {@inheritdoc}
diff --git a/core/modules/user/tests/src/Kernel/Migrate/d7/MigrateUserTest.php b/core/modules/user/tests/src/Kernel/Migrate/d7/MigrateUserTest.php
index c21856e..26b92e8 100644
--- a/core/modules/user/tests/src/Kernel/Migrate/d7/MigrateUserTest.php
+++ b/core/modules/user/tests/src/Kernel/Migrate/d7/MigrateUserTest.php
@@ -21,7 +21,7 @@ class MigrateUserTest extends MigrateDrupal7TestBase {
   /**
    * {@inheritdoc}
    */
-  public static $modules = [
+  protected static $modules = [
     'comment',
     'datetime',
     'file',
diff --git a/core/modules/user/tests/src/Kernel/Plugin/migrate/source/ProfileFieldTest.php b/core/modules/user/tests/src/Kernel/Plugin/migrate/source/ProfileFieldTest.php
index c321185..dadcaaa 100644
--- a/core/modules/user/tests/src/Kernel/Plugin/migrate/source/ProfileFieldTest.php
+++ b/core/modules/user/tests/src/Kernel/Plugin/migrate/source/ProfileFieldTest.php
@@ -15,7 +15,7 @@ class ProfileFieldTest extends MigrateSqlSourceTestBase {
   /**
    * {@inheritdoc}
    */
-  public static $modules = ['user', 'migrate_drupal'];
+  protected static $modules = ['user', 'migrate_drupal'];
 
   /**
    * {@inheritdoc}
diff --git a/core/modules/user/tests/src/Kernel/Plugin/migrate/source/UserPictureInstanceTest.php b/core/modules/user/tests/src/Kernel/Plugin/migrate/source/UserPictureInstanceTest.php
index d9e77ed..a87ede1 100644
--- a/core/modules/user/tests/src/Kernel/Plugin/migrate/source/UserPictureInstanceTest.php
+++ b/core/modules/user/tests/src/Kernel/Plugin/migrate/source/UserPictureInstanceTest.php
@@ -15,7 +15,7 @@ class UserPictureInstanceTest extends MigrateSqlSourceTestBase {
   /**
    * {@inheritdoc}
    */
-  public static $modules = ['user', 'migrate_drupal'];
+  protected static $modules = ['user', 'migrate_drupal'];
 
   /**
    * {@inheritdoc}
diff --git a/core/modules/user/tests/src/Kernel/Plugin/migrate/source/d6/ProfileFieldValuesTest.php b/core/modules/user/tests/src/Kernel/Plugin/migrate/source/d6/ProfileFieldValuesTest.php
index 26c2ed5..2e3aba4 100644
--- a/core/modules/user/tests/src/Kernel/Plugin/migrate/source/d6/ProfileFieldValuesTest.php
+++ b/core/modules/user/tests/src/Kernel/Plugin/migrate/source/d6/ProfileFieldValuesTest.php
@@ -15,7 +15,7 @@ class ProfileFieldValuesTest extends MigrateSqlSourceTestBase {
   /**
    * {@inheritdoc}
    */
-  public static $modules = ['user', 'migrate_drupal'];
+  protected static $modules = ['user', 'migrate_drupal'];
 
   /**
    * {@inheritdoc}
diff --git a/core/modules/user/tests/src/Kernel/Plugin/migrate/source/d6/RoleTest.php b/core/modules/user/tests/src/Kernel/Plugin/migrate/source/d6/RoleTest.php
index 1a841d3..d37659b 100644
--- a/core/modules/user/tests/src/Kernel/Plugin/migrate/source/d6/RoleTest.php
+++ b/core/modules/user/tests/src/Kernel/Plugin/migrate/source/d6/RoleTest.php
@@ -15,7 +15,7 @@ class RoleTest extends MigrateSqlSourceTestBase {
   /**
    * {@inheritdoc}
    */
-  public static $modules = ['user', 'migrate_drupal'];
+  protected static $modules = ['user', 'migrate_drupal'];
 
   /**
    * {@inheritdoc}
diff --git a/core/modules/user/tests/src/Kernel/Plugin/migrate/source/d6/UserPictureFileTest.php b/core/modules/user/tests/src/Kernel/Plugin/migrate/source/d6/UserPictureFileTest.php
index 2724d35..c77b45c 100644
--- a/core/modules/user/tests/src/Kernel/Plugin/migrate/source/d6/UserPictureFileTest.php
+++ b/core/modules/user/tests/src/Kernel/Plugin/migrate/source/d6/UserPictureFileTest.php
@@ -15,7 +15,7 @@ class UserPictureFileTest extends MigrateSqlSourceTestBase {
   /**
    * {@inheritdoc}
    */
-  public static $modules = ['user', 'migrate_drupal'];
+  protected static $modules = ['user', 'migrate_drupal'];
 
   /**
    * {@inheritdoc}
diff --git a/core/modules/user/tests/src/Kernel/Plugin/migrate/source/d6/UserPictureTest.php b/core/modules/user/tests/src/Kernel/Plugin/migrate/source/d6/UserPictureTest.php
index aea6afa..2eb61d8 100644
--- a/core/modules/user/tests/src/Kernel/Plugin/migrate/source/d6/UserPictureTest.php
+++ b/core/modules/user/tests/src/Kernel/Plugin/migrate/source/d6/UserPictureTest.php
@@ -15,7 +15,7 @@ class UserPictureTest extends MigrateSqlSourceTestBase {
   /**
    * {@inheritdoc}
    */
-  public static $modules = ['user', 'migrate_drupal'];
+  protected static $modules = ['user', 'migrate_drupal'];
 
   /**
    * {@inheritdoc}
diff --git a/core/modules/user/tests/src/Kernel/Plugin/migrate/source/d6/UserTest.php b/core/modules/user/tests/src/Kernel/Plugin/migrate/source/d6/UserTest.php
index 1dc34a7..19f85be 100644
--- a/core/modules/user/tests/src/Kernel/Plugin/migrate/source/d6/UserTest.php
+++ b/core/modules/user/tests/src/Kernel/Plugin/migrate/source/d6/UserTest.php
@@ -15,7 +15,7 @@ class UserTest extends MigrateSqlSourceTestBase {
   /**
    * {@inheritdoc}
    */
-  public static $modules = ['user', 'migrate_drupal'];
+  protected static $modules = ['user', 'migrate_drupal'];
 
   /**
    * {@inheritdoc}
diff --git a/core/modules/user/tests/src/Kernel/Plugin/migrate/source/d7/RoleTest.php b/core/modules/user/tests/src/Kernel/Plugin/migrate/source/d7/RoleTest.php
index d2d43a4..885894c 100644
--- a/core/modules/user/tests/src/Kernel/Plugin/migrate/source/d7/RoleTest.php
+++ b/core/modules/user/tests/src/Kernel/Plugin/migrate/source/d7/RoleTest.php
@@ -15,7 +15,7 @@ class RoleTest extends MigrateSqlSourceTestBase {
   /**
    * {@inheritdoc}
    */
-  public static $modules = ['migrate_drupal', 'user'];
+  protected static $modules = ['migrate_drupal', 'user'];
 
   /**
    * {@inheritdoc}
diff --git a/core/modules/user/tests/src/Kernel/Plugin/migrate/source/d7/UserTest.php b/core/modules/user/tests/src/Kernel/Plugin/migrate/source/d7/UserTest.php
index 8e14d63..6e0feb2 100644
--- a/core/modules/user/tests/src/Kernel/Plugin/migrate/source/d7/UserTest.php
+++ b/core/modules/user/tests/src/Kernel/Plugin/migrate/source/d7/UserTest.php
@@ -15,7 +15,7 @@ class UserTest extends MigrateSqlSourceTestBase {
   /**
    * {@inheritdoc}
    */
-  public static $modules = ['user', 'migrate_drupal'];
+  protected static $modules = ['user', 'migrate_drupal'];
 
   /**
    * {@inheritdoc}
diff --git a/core/modules/user/tests/src/Kernel/TempStoreDatabaseTest.php b/core/modules/user/tests/src/Kernel/TempStoreDatabaseTest.php
index 254524a..a74e89f 100644
--- a/core/modules/user/tests/src/Kernel/TempStoreDatabaseTest.php
+++ b/core/modules/user/tests/src/Kernel/TempStoreDatabaseTest.php
@@ -21,7 +21,7 @@ class TempStoreDatabaseTest extends KernelTestBase {
    *
    * @var array
    */
-  public static $modules = array('system', 'user');
+  protected static $modules = array('system', 'user');
 
   /**
    * A key/value store factory.
diff --git a/core/modules/user/tests/src/Kernel/UserAccountFormFieldsTest.php b/core/modules/user/tests/src/Kernel/UserAccountFormFieldsTest.php
index 4022972..ac714c2 100644
--- a/core/modules/user/tests/src/Kernel/UserAccountFormFieldsTest.php
+++ b/core/modules/user/tests/src/Kernel/UserAccountFormFieldsTest.php
@@ -18,7 +18,7 @@ class UserAccountFormFieldsTest extends KernelTestBase {
    *
    * @var array
    */
-  public static $modules = array('system', 'user', 'field');
+  protected static $modules = array('system', 'user', 'field');
 
   /**
    * Tests the root user account form section in the "Configure site" form.
diff --git a/core/modules/user/tests/src/Kernel/UserActionConfigSchemaTest.php b/core/modules/user/tests/src/Kernel/UserActionConfigSchemaTest.php
index 3426349..8e871d2 100644
--- a/core/modules/user/tests/src/Kernel/UserActionConfigSchemaTest.php
+++ b/core/modules/user/tests/src/Kernel/UserActionConfigSchemaTest.php
@@ -21,7 +21,7 @@ class UserActionConfigSchemaTest extends KernelTestBase {
    *
    * @var array
    */
-  public static $modules = array('system', 'user');
+  protected static $modules = array('system', 'user');
 
   /**
    * Tests whether the user action config schema are valid.
diff --git a/core/modules/user/tests/src/Kernel/UserEntityTest.php b/core/modules/user/tests/src/Kernel/UserEntityTest.php
index 9002e5c..9d5f130 100644
--- a/core/modules/user/tests/src/Kernel/UserEntityTest.php
+++ b/core/modules/user/tests/src/Kernel/UserEntityTest.php
@@ -19,7 +19,7 @@ class UserEntityTest extends KernelTestBase {
    *
    * @var array
    */
-  public static $modules = array('system', 'user', 'field');
+  protected static $modules = array('system', 'user', 'field');
 
   /**
    * Tests some of the methods.
diff --git a/core/modules/user/tests/src/Kernel/UserFieldsTest.php b/core/modules/user/tests/src/Kernel/UserFieldsTest.php
index f0fb532..94f262a 100644
--- a/core/modules/user/tests/src/Kernel/UserFieldsTest.php
+++ b/core/modules/user/tests/src/Kernel/UserFieldsTest.php
@@ -17,7 +17,7 @@ class UserFieldsTest extends KernelTestBase {
    *
    * @var array
    */
-  public static $modules = ['user', 'system'];
+  protected static $modules = ['user', 'system'];
 
   /**
    * {@inheritdoc}
diff --git a/core/modules/user/tests/src/Kernel/UserInstallTest.php b/core/modules/user/tests/src/Kernel/UserInstallTest.php
index 2bbcd5f..ba857e6 100644
--- a/core/modules/user/tests/src/Kernel/UserInstallTest.php
+++ b/core/modules/user/tests/src/Kernel/UserInstallTest.php
@@ -16,7 +16,7 @@ class UserInstallTest extends KernelTestBase {
    *
    * @var array
    */
-  public static $modules = array('user');
+  protected static $modules = array('user');
 
   /**
    * {@inheritdoc}
diff --git a/core/modules/user/tests/src/Kernel/UserRoleDeleteTest.php b/core/modules/user/tests/src/Kernel/UserRoleDeleteTest.php
index 1aefbcf..32131a7 100644
--- a/core/modules/user/tests/src/Kernel/UserRoleDeleteTest.php
+++ b/core/modules/user/tests/src/Kernel/UserRoleDeleteTest.php
@@ -17,7 +17,7 @@ class UserRoleDeleteTest extends KernelTestBase {
    *
    * @var array
    */
-  public static $modules = array('system', 'user', 'field');
+  protected static $modules = array('system', 'user', 'field');
 
   protected function setUp() {
     parent::setUp();
diff --git a/core/modules/user/tests/src/Kernel/UserSaveStatusTest.php b/core/modules/user/tests/src/Kernel/UserSaveStatusTest.php
index 00a29fc..10abce4 100644
--- a/core/modules/user/tests/src/Kernel/UserSaveStatusTest.php
+++ b/core/modules/user/tests/src/Kernel/UserSaveStatusTest.php
@@ -17,7 +17,7 @@ class UserSaveStatusTest extends KernelTestBase {
    *
    * @var array
    */
-  public static $modules = array('system', 'user', 'field');
+  protected static $modules = array('system', 'user', 'field');
 
   protected function setUp() {
     parent::setUp();
diff --git a/core/modules/user/tests/src/Kernel/UserValidationTest.php b/core/modules/user/tests/src/Kernel/UserValidationTest.php
index b27b00f..75c84fe 100644
--- a/core/modules/user/tests/src/Kernel/UserValidationTest.php
+++ b/core/modules/user/tests/src/Kernel/UserValidationTest.php
@@ -21,7 +21,7 @@ class UserValidationTest extends KernelTestBase {
    *
    * @var array
    */
-  public static $modules = array('field', 'user', 'system');
+  protected static $modules = array('field', 'user', 'system');
 
   /**
    * {@inheritdoc}
diff --git a/core/modules/user/tests/src/Kernel/Views/UserKernelTestBase.php b/core/modules/user/tests/src/Kernel/Views/UserKernelTestBase.php
index 075315c..a989fde 100644
--- a/core/modules/user/tests/src/Kernel/Views/UserKernelTestBase.php
+++ b/core/modules/user/tests/src/Kernel/Views/UserKernelTestBase.php
@@ -15,7 +15,7 @@
    *
    * @var array
    */
-  public static $modules = array('user_test_views', 'user', 'system', 'field');
+  protected static $modules = array('user_test_views', 'user', 'system', 'field');
 
   /**
    * Users to use during this test.
diff --git a/core/modules/user/tests/src/Kernel/Views/UserViewsFieldAccessTest.php b/core/modules/user/tests/src/Kernel/Views/UserViewsFieldAccessTest.php
index f14779e..e20a01b 100644
--- a/core/modules/user/tests/src/Kernel/Views/UserViewsFieldAccessTest.php
+++ b/core/modules/user/tests/src/Kernel/Views/UserViewsFieldAccessTest.php
@@ -16,7 +16,7 @@ class UserViewsFieldAccessTest extends FieldFieldAccessTestBase {
   /**
    * {@inheritdoc}
    */
-  public static $modules = ['user', 'entity_test', 'language'];
+  protected static $modules = ['user', 'entity_test', 'language'];
 
   /**
    * {@inheritdoc}
diff --git a/core/modules/views/tests/src/FunctionalJavascript/ClickSortingAJAXTest.php b/core/modules/views/tests/src/FunctionalJavascript/ClickSortingAJAXTest.php
index 0e5095d..e000ed6 100644
--- a/core/modules/views/tests/src/FunctionalJavascript/ClickSortingAJAXTest.php
+++ b/core/modules/views/tests/src/FunctionalJavascript/ClickSortingAJAXTest.php
@@ -20,7 +20,7 @@ class ClickSortingAJAXTest extends JavascriptTestBase {
   /**
    * {@inheritdoc}
    */
-  public static $modules = ['node', 'views', 'views_test_config'];
+  protected static $modules = ['node', 'views', 'views_test_config'];
 
   public static $testViews = ['test_content_ajax'];
 
diff --git a/core/modules/views/tests/src/FunctionalJavascript/ExposedFilterAJAXTest.php b/core/modules/views/tests/src/FunctionalJavascript/ExposedFilterAJAXTest.php
index 974aa2d..cbf17d6 100644
--- a/core/modules/views/tests/src/FunctionalJavascript/ExposedFilterAJAXTest.php
+++ b/core/modules/views/tests/src/FunctionalJavascript/ExposedFilterAJAXTest.php
@@ -19,7 +19,7 @@ class ExposedFilterAJAXTest extends JavascriptTestBase {
   /**
    * {@inheritdoc}
    */
-  public static $modules = ['node', 'views'];
+  protected static $modules = ['node', 'views'];
 
   /**
    * Tests if exposed filtering via AJAX works for the "Content" View.
diff --git a/core/modules/views/tests/src/FunctionalJavascript/GlossaryViewTest.php b/core/modules/views/tests/src/FunctionalJavascript/GlossaryViewTest.php
index 42da7b6..09dedc3 100644
--- a/core/modules/views/tests/src/FunctionalJavascript/GlossaryViewTest.php
+++ b/core/modules/views/tests/src/FunctionalJavascript/GlossaryViewTest.php
@@ -22,7 +22,7 @@ class GlossaryViewTest extends JavascriptTestBase {
   /**
    * {@inheritdoc}
    */
-  public static $modules = ['language', 'node', 'views', 'views_test_config'];
+  protected static $modules = ['language', 'node', 'views', 'views_test_config'];
 
   /**
    * @var array
diff --git a/core/modules/views/tests/src/FunctionalJavascript/PaginationAJAXTest.php b/core/modules/views/tests/src/FunctionalJavascript/PaginationAJAXTest.php
index 850c553..ad58e10 100644
--- a/core/modules/views/tests/src/FunctionalJavascript/PaginationAJAXTest.php
+++ b/core/modules/views/tests/src/FunctionalJavascript/PaginationAJAXTest.php
@@ -20,7 +20,7 @@ class PaginationAJAXTest extends JavascriptTestBase {
   /**
    * {@inheritdoc}
    */
-  public static $modules = ['node', 'views', 'views_test_config'];
+  protected static $modules = ['node', 'views', 'views_test_config'];
 
   /**
    * @var array
diff --git a/core/modules/views/tests/src/FunctionalJavascript/Plugin/views/Handler/ContextualFilterTest.php b/core/modules/views/tests/src/FunctionalJavascript/Plugin/views/Handler/ContextualFilterTest.php
index 8cca9c3..0b551db 100644
--- a/core/modules/views/tests/src/FunctionalJavascript/Plugin/views/Handler/ContextualFilterTest.php
+++ b/core/modules/views/tests/src/FunctionalJavascript/Plugin/views/Handler/ContextualFilterTest.php
@@ -15,7 +15,7 @@ class ContextualFilterTest extends JavascriptTestBase {
   /**
    * {@inheritdoc}
    */
-  public static $modules = ['node', 'views', 'views_ui', 'views_test_config'];
+  protected static $modules = ['node', 'views', 'views_ui', 'views_test_config'];
 
   /**
    * Views used by this test.
diff --git a/core/modules/views/tests/src/FunctionalJavascript/Plugin/views/Handler/FieldTest.php b/core/modules/views/tests/src/FunctionalJavascript/Plugin/views/Handler/FieldTest.php
index 6676daf..d98e457 100644
--- a/core/modules/views/tests/src/FunctionalJavascript/Plugin/views/Handler/FieldTest.php
+++ b/core/modules/views/tests/src/FunctionalJavascript/Plugin/views/Handler/FieldTest.php
@@ -19,7 +19,7 @@ class FieldTest extends JavascriptTestBase {
   /**
    * {@inheritdoc}
    */
-  public static $modules = ['node', 'views', 'views_ui', 'views_test_config'];
+  protected static $modules = ['node', 'views', 'views_ui', 'views_test_config'];
 
   /**
    * Views used by this test.
diff --git a/core/modules/views/tests/src/Kernel/Entity/EntityViewsWithMultivalueBasefieldTest.php b/core/modules/views/tests/src/Kernel/Entity/EntityViewsWithMultivalueBasefieldTest.php
index edf0fb0..3a5014f 100644
--- a/core/modules/views/tests/src/Kernel/Entity/EntityViewsWithMultivalueBasefieldTest.php
+++ b/core/modules/views/tests/src/Kernel/Entity/EntityViewsWithMultivalueBasefieldTest.php
@@ -16,7 +16,7 @@ class EntityViewsWithMultivalueBasefieldTest extends ViewsKernelTestBase {
   /**
    * {@inheritdoc}
    */
-  public static $modules = ['entity_test'];
+  protected static $modules = ['entity_test'];
 
   /**
    * {@inheritdoc}
diff --git a/core/modules/views/tests/src/Kernel/Entity/RowEntityRenderersTest.php b/core/modules/views/tests/src/Kernel/Entity/RowEntityRenderersTest.php
index dfcb30e..0e68589 100644
--- a/core/modules/views/tests/src/Kernel/Entity/RowEntityRenderersTest.php
+++ b/core/modules/views/tests/src/Kernel/Entity/RowEntityRenderersTest.php
@@ -20,7 +20,7 @@ class RowEntityRenderersTest extends ViewsKernelTestBase {
    *
    * @var array
    */
-  public static $modules = ['field', 'filter', 'text', 'node', 'user', 'language', 'views_test_language'];
+  protected static $modules = ['field', 'filter', 'text', 'node', 'user', 'language', 'views_test_language'];
 
   /**
    * Views used by this test.
diff --git a/core/modules/views/tests/src/Kernel/Entity/ViewEntityDependenciesTest.php b/core/modules/views/tests/src/Kernel/Entity/ViewEntityDependenciesTest.php
index f97659a..c8202d7 100644
--- a/core/modules/views/tests/src/Kernel/Entity/ViewEntityDependenciesTest.php
+++ b/core/modules/views/tests/src/Kernel/Entity/ViewEntityDependenciesTest.php
@@ -30,7 +30,7 @@ class ViewEntityDependenciesTest extends ViewsKernelTestBase {
    *
    * @var array
    */
-  public static $modules = ['node', 'comment', 'user', 'field', 'text', 'search'];
+  protected static $modules = ['node', 'comment', 'user', 'field', 'text', 'search'];
 
   /**
    * {@inheritdoc}
diff --git a/core/modules/views/tests/src/Kernel/EventSubscriber/ViewsEntitySchemaSubscriberIntegrationTest.php b/core/modules/views/tests/src/Kernel/EventSubscriber/ViewsEntitySchemaSubscriberIntegrationTest.php
index 3c46c9e..d1ec385 100644
--- a/core/modules/views/tests/src/Kernel/EventSubscriber/ViewsEntitySchemaSubscriberIntegrationTest.php
+++ b/core/modules/views/tests/src/Kernel/EventSubscriber/ViewsEntitySchemaSubscriberIntegrationTest.php
@@ -26,7 +26,7 @@ class ViewsEntitySchemaSubscriberIntegrationTest extends ViewsKernelTestBase {
   /**
    * {@inheritdoc}
    */
-  public static $modules = ['entity_test', 'user', 'text'];
+  protected static $modules = ['entity_test', 'user', 'text'];
 
   /**
    * Views used by this test.
diff --git a/core/modules/views/tests/src/Kernel/Handler/AreaEntityTest.php b/core/modules/views/tests/src/Kernel/Handler/AreaEntityTest.php
index ebf9e05..d1910f4 100644
--- a/core/modules/views/tests/src/Kernel/Handler/AreaEntityTest.php
+++ b/core/modules/views/tests/src/Kernel/Handler/AreaEntityTest.php
@@ -24,7 +24,7 @@ class AreaEntityTest extends ViewsKernelTestBase {
    *
    * @var array
    */
-  public static $modules = ['entity_test', 'user', 'block'];
+  protected static $modules = ['entity_test', 'user', 'block'];
 
   /**
    * Views used by this test.
diff --git a/core/modules/views/tests/src/Kernel/Handler/AreaOrderTest.php b/core/modules/views/tests/src/Kernel/Handler/AreaOrderTest.php
index 9ade514..a7400ee 100644
--- a/core/modules/views/tests/src/Kernel/Handler/AreaOrderTest.php
+++ b/core/modules/views/tests/src/Kernel/Handler/AreaOrderTest.php
@@ -21,7 +21,7 @@ class AreaOrderTest extends ViewsKernelTestBase {
    *
    * @var array
    */
-  public static $modules = array('user', 'block');
+  protected static $modules = array('user', 'block');
 
   /**
    * Views used by this test.
diff --git a/core/modules/views/tests/src/Kernel/Handler/AreaTextTest.php b/core/modules/views/tests/src/Kernel/Handler/AreaTextTest.php
index 5ccacd8..b17ea18 100644
--- a/core/modules/views/tests/src/Kernel/Handler/AreaTextTest.php
+++ b/core/modules/views/tests/src/Kernel/Handler/AreaTextTest.php
@@ -13,7 +13,7 @@
  */
 class AreaTextTest extends ViewsKernelTestBase {
 
-  public static $modules = array('system', 'user', 'filter');
+  protected static $modules = array('system', 'user', 'filter');
 
   /**
    * Views used by this test.
diff --git a/core/modules/views/tests/src/Kernel/Handler/AreaViewTest.php b/core/modules/views/tests/src/Kernel/Handler/AreaViewTest.php
index 89fe49e..286e749 100644
--- a/core/modules/views/tests/src/Kernel/Handler/AreaViewTest.php
+++ b/core/modules/views/tests/src/Kernel/Handler/AreaViewTest.php
@@ -18,7 +18,7 @@ class AreaViewTest extends ViewsKernelTestBase {
    *
    * @var array
    */
-  public static $modules = array('user');
+  protected static $modules = array('user');
 
   /**
    * Views used by this test.
diff --git a/core/modules/views/tests/src/Kernel/Handler/EntityTestViewsFieldAccessTest.php b/core/modules/views/tests/src/Kernel/Handler/EntityTestViewsFieldAccessTest.php
index 3492ff1..5989b88 100644
--- a/core/modules/views/tests/src/Kernel/Handler/EntityTestViewsFieldAccessTest.php
+++ b/core/modules/views/tests/src/Kernel/Handler/EntityTestViewsFieldAccessTest.php
@@ -13,7 +13,7 @@ class EntityTestViewsFieldAccessTest extends FieldFieldAccessTestBase {
   /**
    * {@inheritdoc}
    */
-  public static $modules = ['entity_test'];
+  protected static $modules = ['entity_test'];
 
   /**
    * {@inheritdoc}
diff --git a/core/modules/views/tests/src/Kernel/Handler/FieldCounterTest.php b/core/modules/views/tests/src/Kernel/Handler/FieldCounterTest.php
index 12f68ed..ae3badc 100644
--- a/core/modules/views/tests/src/Kernel/Handler/FieldCounterTest.php
+++ b/core/modules/views/tests/src/Kernel/Handler/FieldCounterTest.php
@@ -17,7 +17,7 @@ class FieldCounterTest extends ViewsKernelTestBase {
    *
    * @var array
    */
-  public static $modules = array('user');
+  protected static $modules = array('user');
 
   /**
    * Views used by this test.
diff --git a/core/modules/views/tests/src/Kernel/Handler/FieldEntityLinkTest.php b/core/modules/views/tests/src/Kernel/Handler/FieldEntityLinkTest.php
index 8f53f6a..db57454 100644
--- a/core/modules/views/tests/src/Kernel/Handler/FieldEntityLinkTest.php
+++ b/core/modules/views/tests/src/Kernel/Handler/FieldEntityLinkTest.php
@@ -30,7 +30,7 @@ class FieldEntityLinkTest extends ViewsKernelTestBase {
    *
    * @var array
    */
-  public static $modules = array('user', 'entity_test');
+  protected static $modules = array('user', 'entity_test');
 
   /**
    * An admin user account.
diff --git a/core/modules/views/tests/src/Kernel/Handler/FieldFieldAccessTestBase.php b/core/modules/views/tests/src/Kernel/Handler/FieldFieldAccessTestBase.php
index 5ff77bc..37e1f4e 100644
--- a/core/modules/views/tests/src/Kernel/Handler/FieldFieldAccessTestBase.php
+++ b/core/modules/views/tests/src/Kernel/Handler/FieldFieldAccessTestBase.php
@@ -30,7 +30,7 @@
   /**
    * {@inheritdoc}
    */
-  public static $modules = ['user'];
+  protected static $modules = ['user'];
 
   /**
    * {@inheritdoc}
diff --git a/core/modules/views/tests/src/Kernel/Handler/FieldFieldTest.php b/core/modules/views/tests/src/Kernel/Handler/FieldFieldTest.php
index c82fc69..918be74 100644
--- a/core/modules/views/tests/src/Kernel/Handler/FieldFieldTest.php
+++ b/core/modules/views/tests/src/Kernel/Handler/FieldFieldTest.php
@@ -24,7 +24,7 @@ class FieldFieldTest extends ViewsKernelTestBase {
   /**
    * {@inheritdoc}
    */
-  public static $modules = ['field', 'entity_test', 'user', 'views_test_formatter'];
+  protected static $modules = ['field', 'entity_test', 'user', 'views_test_formatter'];
 
   /**
    * {@inheritdoc}
diff --git a/core/modules/views/tests/src/Kernel/Handler/FieldKernelTest.php b/core/modules/views/tests/src/Kernel/Handler/FieldKernelTest.php
index a57e478..c24772b 100644
--- a/core/modules/views/tests/src/Kernel/Handler/FieldKernelTest.php
+++ b/core/modules/views/tests/src/Kernel/Handler/FieldKernelTest.php
@@ -15,7 +15,7 @@
  */
 class FieldKernelTest extends ViewsKernelTestBase {
 
-  public static $modules = array('user');
+  protected static $modules = array('user');
 
   /**
    * Views used by this test.
diff --git a/core/modules/views/tests/src/Kernel/Handler/FieldRenderedEntityTest.php b/core/modules/views/tests/src/Kernel/Handler/FieldRenderedEntityTest.php
index 02419f4..f49d682 100644
--- a/core/modules/views/tests/src/Kernel/Handler/FieldRenderedEntityTest.php
+++ b/core/modules/views/tests/src/Kernel/Handler/FieldRenderedEntityTest.php
@@ -24,7 +24,7 @@ class FieldRenderedEntityTest extends ViewsKernelTestBase {
    *
    * @var array
    */
-  public static $modules = ['entity_test', 'field'];
+  protected static $modules = ['entity_test', 'field'];
 
   /**
    * Views used by this test.
diff --git a/core/modules/views/tests/src/Kernel/Handler/FieldUrlTest.php b/core/modules/views/tests/src/Kernel/Handler/FieldUrlTest.php
index bfb764d..26ed77b 100644
--- a/core/modules/views/tests/src/Kernel/Handler/FieldUrlTest.php
+++ b/core/modules/views/tests/src/Kernel/Handler/FieldUrlTest.php
@@ -13,7 +13,7 @@
  */
 class FieldUrlTest extends ViewsKernelTestBase {
 
-  public static $modules = array('system');
+  protected static $modules = array('system');
 
   /**
    * Views used by this test.
diff --git a/core/modules/views/tests/src/Kernel/Handler/FilterBooleanOperatorStringTest.php b/core/modules/views/tests/src/Kernel/Handler/FilterBooleanOperatorStringTest.php
index 5bd2157..e9bec33 100644
--- a/core/modules/views/tests/src/Kernel/Handler/FilterBooleanOperatorStringTest.php
+++ b/core/modules/views/tests/src/Kernel/Handler/FilterBooleanOperatorStringTest.php
@@ -19,7 +19,7 @@ class FilterBooleanOperatorStringTest extends ViewsKernelTestBase {
    *
    * @var array
    */
-  public static $modules = array('system');
+  protected static $modules = array('system');
 
   /**
    * Views used by this test.
diff --git a/core/modules/views/tests/src/Kernel/Handler/FilterBooleanOperatorTest.php b/core/modules/views/tests/src/Kernel/Handler/FilterBooleanOperatorTest.php
index 7a88066..c7d3a85 100644
--- a/core/modules/views/tests/src/Kernel/Handler/FilterBooleanOperatorTest.php
+++ b/core/modules/views/tests/src/Kernel/Handler/FilterBooleanOperatorTest.php
@@ -18,7 +18,7 @@ class FilterBooleanOperatorTest extends ViewsKernelTestBase {
    *
    * @var array
    */
-  public static $modules = array('system');
+  protected static $modules = array('system');
 
   /**
    * Views used by this test.
diff --git a/core/modules/views/tests/src/Kernel/Handler/FilterCombineTest.php b/core/modules/views/tests/src/Kernel/Handler/FilterCombineTest.php
index 0424263..3e424d1 100644
--- a/core/modules/views/tests/src/Kernel/Handler/FilterCombineTest.php
+++ b/core/modules/views/tests/src/Kernel/Handler/FilterCombineTest.php
@@ -15,7 +15,7 @@ class FilterCombineTest extends ViewsKernelTestBase {
   /**
    * {@inheritdoc}
    */
-  public static $modules = array('entity_test');
+  protected static $modules = array('entity_test');
 
   /**
    * Views used by this test.
diff --git a/core/modules/views/tests/src/Kernel/Handler/FilterEqualityTest.php b/core/modules/views/tests/src/Kernel/Handler/FilterEqualityTest.php
index a4bd6c8..9078f09 100644
--- a/core/modules/views/tests/src/Kernel/Handler/FilterEqualityTest.php
+++ b/core/modules/views/tests/src/Kernel/Handler/FilterEqualityTest.php
@@ -12,7 +12,7 @@
  */
 class FilterEqualityTest extends ViewsKernelTestBase {
 
-  public static $modules = array('system');
+  protected static $modules = array('system');
 
   /**
    * Views used by this test.
diff --git a/core/modules/views/tests/src/Kernel/Handler/FilterInOperatorTest.php b/core/modules/views/tests/src/Kernel/Handler/FilterInOperatorTest.php
index 9ab08e1..854cbcf 100644
--- a/core/modules/views/tests/src/Kernel/Handler/FilterInOperatorTest.php
+++ b/core/modules/views/tests/src/Kernel/Handler/FilterInOperatorTest.php
@@ -12,7 +12,7 @@
  */
 class FilterInOperatorTest extends ViewsKernelTestBase {
 
-  public static $modules = array('system');
+  protected static $modules = array('system');
 
   /**
    * Views used by this test.
diff --git a/core/modules/views/tests/src/Kernel/Handler/FilterNumericTest.php b/core/modules/views/tests/src/Kernel/Handler/FilterNumericTest.php
index c4c978a..9c3e10b 100644
--- a/core/modules/views/tests/src/Kernel/Handler/FilterNumericTest.php
+++ b/core/modules/views/tests/src/Kernel/Handler/FilterNumericTest.php
@@ -12,7 +12,7 @@
  */
 class FilterNumericTest extends ViewsKernelTestBase {
 
-  public static $modules = array('system');
+  protected static $modules = array('system');
 
   /**
    * Views used by this test.
diff --git a/core/modules/views/tests/src/Kernel/Handler/FilterStringTest.php b/core/modules/views/tests/src/Kernel/Handler/FilterStringTest.php
index 5dd47ec..7195f0b 100644
--- a/core/modules/views/tests/src/Kernel/Handler/FilterStringTest.php
+++ b/core/modules/views/tests/src/Kernel/Handler/FilterStringTest.php
@@ -12,7 +12,7 @@
  */
 class FilterStringTest extends ViewsKernelTestBase {
 
-  public static $modules = array('system');
+  protected static $modules = array('system');
 
   /**
    * Views used by this test.
diff --git a/core/modules/views/tests/src/Kernel/Handler/HandlerAliasTest.php b/core/modules/views/tests/src/Kernel/Handler/HandlerAliasTest.php
index 48f4e3d..2bd3c1b 100644
--- a/core/modules/views/tests/src/Kernel/Handler/HandlerAliasTest.php
+++ b/core/modules/views/tests/src/Kernel/Handler/HandlerAliasTest.php
@@ -12,7 +12,7 @@
  */
 class HandlerAliasTest extends ViewsKernelTestBase {
 
-  public static $modules = array('user');
+  protected static $modules = array('user');
 
   /**
    * Views used by this test.
diff --git a/core/modules/views/tests/src/Kernel/ModuleTest.php b/core/modules/views/tests/src/Kernel/ModuleTest.php
index 204433d..0808d78 100644
--- a/core/modules/views/tests/src/Kernel/ModuleTest.php
+++ b/core/modules/views/tests/src/Kernel/ModuleTest.php
@@ -26,7 +26,7 @@ class ModuleTest extends ViewsKernelTestBase {
    *
    * @var array
    */
-  public static $modules = ['field', 'user', 'block'];
+  protected static $modules = ['field', 'user', 'block'];
 
   /**
    * Stores the last triggered error, for example via debug().
diff --git a/core/modules/views/tests/src/Kernel/Plugin/BlockDependenciesTest.php b/core/modules/views/tests/src/Kernel/Plugin/BlockDependenciesTest.php
index 6b5de6e..22cf4b9 100644
--- a/core/modules/views/tests/src/Kernel/Plugin/BlockDependenciesTest.php
+++ b/core/modules/views/tests/src/Kernel/Plugin/BlockDependenciesTest.php
@@ -24,7 +24,7 @@ class BlockDependenciesTest extends ViewsKernelTestBase {
    *
    * @var array
    */
-  public static $modules = array('node', 'block', 'user', 'field');
+  protected static $modules = array('node', 'block', 'user', 'field');
 
   /**
    * Tests that exposed filter blocks have the correct dependencies.
diff --git a/core/modules/views/tests/src/Kernel/Plugin/CacheTest.php b/core/modules/views/tests/src/Kernel/Plugin/CacheTest.php
index 31805d8..5cbb7f5 100644
--- a/core/modules/views/tests/src/Kernel/Plugin/CacheTest.php
+++ b/core/modules/views/tests/src/Kernel/Plugin/CacheTest.php
@@ -28,7 +28,7 @@ class CacheTest extends ViewsKernelTestBase {
    *
    * @var array
    */
-  public static $modules = array('taxonomy', 'text', 'user', 'node');
+  protected static $modules = array('taxonomy', 'text', 'user', 'node');
 
   /**
    * {@inheritdoc}
diff --git a/core/modules/views/tests/src/Kernel/Plugin/Display/ViewsMenuLinkTest.php b/core/modules/views/tests/src/Kernel/Plugin/Display/ViewsMenuLinkTest.php
index 9e05ebc..96ab40e 100644
--- a/core/modules/views/tests/src/Kernel/Plugin/Display/ViewsMenuLinkTest.php
+++ b/core/modules/views/tests/src/Kernel/Plugin/Display/ViewsMenuLinkTest.php
@@ -14,7 +14,7 @@ class ViewsMenuLinkTest extends ViewsKernelTestBase {
   /**
    * {@inheritdoc}
    */
-  public static $modules = [
+  protected static $modules = [
     'menu_ui',
     'user',
     'views'
diff --git a/core/modules/views/tests/src/Kernel/Plugin/DisplayKernelTest.php b/core/modules/views/tests/src/Kernel/Plugin/DisplayKernelTest.php
index 156b061..0e4e869 100644
--- a/core/modules/views/tests/src/Kernel/Plugin/DisplayKernelTest.php
+++ b/core/modules/views/tests/src/Kernel/Plugin/DisplayKernelTest.php
@@ -24,7 +24,7 @@ class DisplayKernelTest extends ViewsKernelTestBase {
    *
    * @var array
    */
-  public static $modules = array('block', 'node', 'field', 'user');
+  protected static $modules = array('block', 'node', 'field', 'user');
 
   /**
    * Views plugin types to test.
diff --git a/core/modules/views/tests/src/Kernel/Plugin/DisplayPageTest.php b/core/modules/views/tests/src/Kernel/Plugin/DisplayPageTest.php
index 5e4724a..f448b42 100644
--- a/core/modules/views/tests/src/Kernel/Plugin/DisplayPageTest.php
+++ b/core/modules/views/tests/src/Kernel/Plugin/DisplayPageTest.php
@@ -29,7 +29,7 @@ class DisplayPageTest extends ViewsKernelTestBase {
    *
    * @var array
    */
-  public static $modules = array('system', 'user', 'field');
+  protected static $modules = array('system', 'user', 'field');
 
   /**
    * The router dumper to get all routes.
diff --git a/core/modules/views/tests/src/Kernel/Plugin/PagerKernelTest.php b/core/modules/views/tests/src/Kernel/Plugin/PagerKernelTest.php
index c6f581a..891e013 100644
--- a/core/modules/views/tests/src/Kernel/Plugin/PagerKernelTest.php
+++ b/core/modules/views/tests/src/Kernel/Plugin/PagerKernelTest.php
@@ -21,7 +21,7 @@ class PagerKernelTest extends ViewsKernelTestBase {
   /**
    * {@inheritdoc}
    */
-  public static $modules = ['user', 'node'];
+  protected static $modules = ['user', 'node'];
 
   /**
    * {@inheritdoc}
diff --git a/core/modules/views/tests/src/Kernel/Plugin/RelationshipJoinTestBase.php b/core/modules/views/tests/src/Kernel/Plugin/RelationshipJoinTestBase.php
index cf604f9..52fca69 100644
--- a/core/modules/views/tests/src/Kernel/Plugin/RelationshipJoinTestBase.php
+++ b/core/modules/views/tests/src/Kernel/Plugin/RelationshipJoinTestBase.php
@@ -18,7 +18,7 @@
    *
    * @var array
    */
-  public static $modules = array('system', 'user', 'field');
+  protected static $modules = array('system', 'user', 'field');
 
   /**
    * @var \Drupal\user\Entity\User
diff --git a/core/modules/views/tests/src/Kernel/Plugin/RowEntityTest.php b/core/modules/views/tests/src/Kernel/Plugin/RowEntityTest.php
index 8d2d866..fcfd69e 100644
--- a/core/modules/views/tests/src/Kernel/Plugin/RowEntityTest.php
+++ b/core/modules/views/tests/src/Kernel/Plugin/RowEntityTest.php
@@ -21,7 +21,7 @@ class RowEntityTest extends ViewsKernelTestBase {
    *
    * @var array
    */
-  public static $modules = ['taxonomy', 'text', 'filter', 'field', 'system', 'node', 'user'];
+  protected static $modules = ['taxonomy', 'text', 'filter', 'field', 'system', 'node', 'user'];
 
   /**
    * Views used by this test.
diff --git a/core/modules/views/tests/src/Kernel/Plugin/RowRenderCacheTest.php b/core/modules/views/tests/src/Kernel/Plugin/RowRenderCacheTest.php
index ac85c77..4edd0a2 100644
--- a/core/modules/views/tests/src/Kernel/Plugin/RowRenderCacheTest.php
+++ b/core/modules/views/tests/src/Kernel/Plugin/RowRenderCacheTest.php
@@ -24,7 +24,7 @@ class RowRenderCacheTest extends ViewsKernelTestBase {
    *
    * @var array
    */
-  public static $modules = array('user', 'node');
+  protected static $modules = array('user', 'node');
 
   /**
    * Views used by this test.
diff --git a/core/modules/views/tests/src/Kernel/Plugin/SqlEntityLoadingTest.php b/core/modules/views/tests/src/Kernel/Plugin/SqlEntityLoadingTest.php
index 339638c..a256b84 100644
--- a/core/modules/views/tests/src/Kernel/Plugin/SqlEntityLoadingTest.php
+++ b/core/modules/views/tests/src/Kernel/Plugin/SqlEntityLoadingTest.php
@@ -19,7 +19,7 @@ class SqlEntityLoadingTest extends ViewsKernelTestBase {
   /**
    * {@inheritdoc}
    */
-  public static $modules = ['node', 'user'];
+  protected static $modules = ['node', 'user'];
 
   /**
    * {@inheritdoc}
diff --git a/core/modules/views/tests/src/Kernel/Plugin/StyleMappingTest.php b/core/modules/views/tests/src/Kernel/Plugin/StyleMappingTest.php
index 1cb4400..d79edb6 100644
--- a/core/modules/views/tests/src/Kernel/Plugin/StyleMappingTest.php
+++ b/core/modules/views/tests/src/Kernel/Plugin/StyleMappingTest.php
@@ -11,7 +11,7 @@
  */
 class StyleMappingTest extends StyleTestBase {
 
-  public static $modules = array('system');
+  protected static $modules = array('system');
 
   /**
    * Views used by this test.
diff --git a/core/modules/views/tests/src/Kernel/Plugin/ViewsBlockTest.php b/core/modules/views/tests/src/Kernel/Plugin/ViewsBlockTest.php
index f30db33..4265170 100644
--- a/core/modules/views/tests/src/Kernel/Plugin/ViewsBlockTest.php
+++ b/core/modules/views/tests/src/Kernel/Plugin/ViewsBlockTest.php
@@ -18,7 +18,7 @@ class ViewsBlockTest extends ViewsKernelTestBase {
    *
    * @var array
    */
-  public static $modules = array('block', 'block_test_views');
+  protected static $modules = array('block', 'block_test_views');
 
   /**
    * Views used by this test.
diff --git a/core/modules/views/tests/src/Kernel/QueryGroupByTest.php b/core/modules/views/tests/src/Kernel/QueryGroupByTest.php
index 594bd62..11151f2 100644
--- a/core/modules/views/tests/src/Kernel/QueryGroupByTest.php
+++ b/core/modules/views/tests/src/Kernel/QueryGroupByTest.php
@@ -27,7 +27,7 @@ class QueryGroupByTest extends ViewsKernelTestBase {
    *
    * @var array
    */
-  public static $modules = array('entity_test', 'system', 'field', 'user', 'language');
+  protected static $modules = array('entity_test', 'system', 'field', 'user', 'language');
 
   /**
    * The storage for the test entity type.
diff --git a/core/modules/views/tests/src/Kernel/RenderCacheIntegrationTest.php b/core/modules/views/tests/src/Kernel/RenderCacheIntegrationTest.php
index a2bec23..358b1c0 100644
--- a/core/modules/views/tests/src/Kernel/RenderCacheIntegrationTest.php
+++ b/core/modules/views/tests/src/Kernel/RenderCacheIntegrationTest.php
@@ -27,7 +27,7 @@ class RenderCacheIntegrationTest extends ViewsKernelTestBase {
   /**
    * {@inheritdoc}
    */
-  public static $modules = ['entity_test', 'user', 'node'];
+  protected static $modules = ['entity_test', 'user', 'node'];
 
   /**
    * {@inheritdoc}
diff --git a/core/modules/views/tests/src/Kernel/TestViewsTest.php b/core/modules/views/tests/src/Kernel/TestViewsTest.php
index f67b5e8..0e9665a 100644
--- a/core/modules/views/tests/src/Kernel/TestViewsTest.php
+++ b/core/modules/views/tests/src/Kernel/TestViewsTest.php
@@ -22,7 +22,7 @@ class TestViewsTest extends KernelTestBase {
    *
    * @var array
    */
-  public static $modules = array('views_test_data');
+  protected static $modules = array('views_test_data');
 
   /**
    * Tests default configuration data type.
diff --git a/core/modules/views/tests/src/Kernel/TokenReplaceTest.php b/core/modules/views/tests/src/Kernel/TokenReplaceTest.php
index 5cf40ad..bfa00eb 100644
--- a/core/modules/views/tests/src/Kernel/TokenReplaceTest.php
+++ b/core/modules/views/tests/src/Kernel/TokenReplaceTest.php
@@ -12,7 +12,7 @@
  */
 class TokenReplaceTest extends ViewsKernelTestBase {
 
-  public static $modules = array('system');
+  protected static $modules = array('system');
 
   /**
    * Views used by this test.
diff --git a/core/modules/views/tests/src/Kernel/ViewExecutableTest.php b/core/modules/views/tests/src/Kernel/ViewExecutableTest.php
index 01057b4..8c35f09 100644
--- a/core/modules/views/tests/src/Kernel/ViewExecutableTest.php
+++ b/core/modules/views/tests/src/Kernel/ViewExecutableTest.php
@@ -31,7 +31,7 @@ class ViewExecutableTest extends ViewsKernelTestBase {
 
   use CommentTestTrait;
 
-  public static $modules = ['system', 'node', 'comment', 'user', 'filter', 'field', 'text'];
+  protected static $modules = ['system', 'node', 'comment', 'user', 'filter', 'field', 'text'];
 
   /**
    * Views used by this test.
diff --git a/core/modules/views/tests/src/Kernel/ViewsConfigDependenciesIntegrationTest.php b/core/modules/views/tests/src/Kernel/ViewsConfigDependenciesIntegrationTest.php
index f5a2e39..3852030 100644
--- a/core/modules/views/tests/src/Kernel/ViewsConfigDependenciesIntegrationTest.php
+++ b/core/modules/views/tests/src/Kernel/ViewsConfigDependenciesIntegrationTest.php
@@ -17,7 +17,7 @@ class ViewsConfigDependenciesIntegrationTest extends ViewsKernelTestBase {
   /**
    * {@inheritdoc}
    */
-  public static $modules = ['field', 'file', 'image', 'entity_test'];
+  protected static $modules = ['field', 'file', 'image', 'entity_test'];
 
   /**
    * {@inheritdoc}
diff --git a/core/modules/views/tests/src/Kernel/ViewsKernelTestBase.php b/core/modules/views/tests/src/Kernel/ViewsKernelTestBase.php
index f149b7f..53950a4 100644
--- a/core/modules/views/tests/src/Kernel/ViewsKernelTestBase.php
+++ b/core/modules/views/tests/src/Kernel/ViewsKernelTestBase.php
@@ -28,7 +28,7 @@
   /**
    * {@inheritdoc}
    */
-  public static $modules = ['system', 'views', 'views_test_config', 'views_test_data', 'user'];
+  protected static $modules = ['system', 'views', 'views_test_config', 'views_test_data', 'user'];
 
   /**
    * {@inheritdoc}
diff --git a/core/modules/views/tests/src/Kernel/Wizard/WizardPluginBaseKernelTest.php b/core/modules/views/tests/src/Kernel/Wizard/WizardPluginBaseKernelTest.php
index 27f21c2..7e5d9d3 100644
--- a/core/modules/views/tests/src/Kernel/Wizard/WizardPluginBaseKernelTest.php
+++ b/core/modules/views/tests/src/Kernel/Wizard/WizardPluginBaseKernelTest.php
@@ -20,7 +20,7 @@ class WizardPluginBaseKernelTest extends ViewsKernelTestBase {
    *
    * @var array
    */
-  public static $modules = array('language', 'system', 'user', 'views_ui');
+  protected static $modules = array('language', 'system', 'user', 'views_ui');
 
   /**
    * Contains thw wizard plugin manager.
diff --git a/core/modules/views_ui/tests/src/FunctionalJavascript/LibraryCachingTest.php b/core/modules/views_ui/tests/src/FunctionalJavascript/LibraryCachingTest.php
index fc98e87..297c27f 100644
--- a/core/modules/views_ui/tests/src/FunctionalJavascript/LibraryCachingTest.php
+++ b/core/modules/views_ui/tests/src/FunctionalJavascript/LibraryCachingTest.php
@@ -14,7 +14,7 @@ class LibraryCachingTest extends JavascriptTestBase {
   /**
    * {@inheritdoc}
    */
-  public static $modules = ['node', 'views', 'views_ui'];
+  protected static $modules = ['node', 'views', 'views_ui'];
 
   /**
    * Tests if the Views UI dialogs open on consecutive requests.
diff --git a/core/modules/views_ui/tests/src/FunctionalJavascript/ViewsListingTest.php b/core/modules/views_ui/tests/src/FunctionalJavascript/ViewsListingTest.php
index c39db77..bb2ace7 100644
--- a/core/modules/views_ui/tests/src/FunctionalJavascript/ViewsListingTest.php
+++ b/core/modules/views_ui/tests/src/FunctionalJavascript/ViewsListingTest.php
@@ -15,7 +15,7 @@ class ViewsListingTest extends JavascriptTestBase {
   /**
    * {@inheritdoc}
    */
-  public static $modules = ['node', 'views', 'views_ui'];
+  protected static $modules = ['node', 'views', 'views_ui'];
 
   /**
    * {@inheritdoc}
diff --git a/core/modules/views_ui/tests/src/FunctionalJavascript/ViewsWizardTest.php b/core/modules/views_ui/tests/src/FunctionalJavascript/ViewsWizardTest.php
index 6320f69..f8b173f 100644
--- a/core/modules/views_ui/tests/src/FunctionalJavascript/ViewsWizardTest.php
+++ b/core/modules/views_ui/tests/src/FunctionalJavascript/ViewsWizardTest.php
@@ -15,7 +15,7 @@ class ViewsWizardTest extends JavascriptTestBase {
   /**
    * {@inheritdoc}
    */
-  public static $modules = ['node', 'views', 'views_ui', 'block'];
+  protected static $modules = ['node', 'views', 'views_ui', 'block'];
 
   /**
    * {@inheritdoc}
diff --git a/core/modules/views_ui/tests/src/Kernel/TagTest.php b/core/modules/views_ui/tests/src/Kernel/TagTest.php
index fda2e28..a92d25b 100644
--- a/core/modules/views_ui/tests/src/Kernel/TagTest.php
+++ b/core/modules/views_ui/tests/src/Kernel/TagTest.php
@@ -19,7 +19,7 @@ class TagTest extends ViewsKernelTestBase {
    *
    * @var array
    */
-  public static $modules = array('views', 'views_ui', 'user');
+  protected static $modules = array('views', 'views_ui', 'user');
 
   /**
    * Tests the views_ui_autocomplete_tag function.
diff --git a/core/tests/Drupal/FunctionalJavascriptTests/Ajax/AjaxTest.php b/core/tests/Drupal/FunctionalJavascriptTests/Ajax/AjaxTest.php
index e059405..82e21224 100644
--- a/core/tests/Drupal/FunctionalJavascriptTests/Ajax/AjaxTest.php
+++ b/core/tests/Drupal/FunctionalJavascriptTests/Ajax/AjaxTest.php
@@ -14,7 +14,7 @@ class AjaxTest extends JavascriptTestBase {
   /**
    * {@inheritdoc}
    */
-  public static $modules = ['ajax_test'];
+  protected static $modules = ['ajax_test'];
 
   public function testAjaxWithAdminRoute() {
     \Drupal::service('theme_installer')->install(['stable', 'seven']);
diff --git a/core/tests/Drupal/FunctionalJavascriptTests/Core/MachineNameTest.php b/core/tests/Drupal/FunctionalJavascriptTests/Core/MachineNameTest.php
index 23c2f0b..07c5fc6 100644
--- a/core/tests/Drupal/FunctionalJavascriptTests/Core/MachineNameTest.php
+++ b/core/tests/Drupal/FunctionalJavascriptTests/Core/MachineNameTest.php
@@ -19,7 +19,7 @@ class MachineNameTest extends JavascriptTestBase {
    *
    * @var array
    */
-  public static $modules = ['node', 'form_test'];
+  protected static $modules = ['node', 'form_test'];
 
   /**
    * {@inheritdoc}
diff --git a/core/tests/Drupal/FunctionalJavascriptTests/Core/Session/SessionTest.php b/core/tests/Drupal/FunctionalJavascriptTests/Core/Session/SessionTest.php
index e02e0df..ce04d28 100644
--- a/core/tests/Drupal/FunctionalJavascriptTests/Core/Session/SessionTest.php
+++ b/core/tests/Drupal/FunctionalJavascriptTests/Core/Session/SessionTest.php
@@ -15,7 +15,7 @@ class SessionTest extends JavascriptTestBase {
   /**
    * {@inheritdoc}
    */
-  public static $modules = ['menu_link_content', 'block'];
+  protected static $modules = ['menu_link_content', 'block'];
 
   /**
    * {@inheritdoc}
diff --git a/core/tests/Drupal/FunctionalJavascriptTests/EntityReference/EntityReferenceAutocompleteWidgetTest.php b/core/tests/Drupal/FunctionalJavascriptTests/EntityReference/EntityReferenceAutocompleteWidgetTest.php
index a116c6f..e8557d9 100644
--- a/core/tests/Drupal/FunctionalJavascriptTests/EntityReference/EntityReferenceAutocompleteWidgetTest.php
+++ b/core/tests/Drupal/FunctionalJavascriptTests/EntityReference/EntityReferenceAutocompleteWidgetTest.php
@@ -21,7 +21,7 @@ class EntityReferenceAutocompleteWidgetTest extends JavascriptTestBase {
   /**
    * {@inheritdoc}
    */
-  public static $modules = ['node'];
+  protected static $modules = ['node'];
 
   /**
    * {@inheritdoc}
diff --git a/core/tests/Drupal/FunctionalTests/Breadcrumb/Breadcrumb404Test.php b/core/tests/Drupal/FunctionalTests/Breadcrumb/Breadcrumb404Test.php
index 7dcafbf..cbf6b98 100644
--- a/core/tests/Drupal/FunctionalTests/Breadcrumb/Breadcrumb404Test.php
+++ b/core/tests/Drupal/FunctionalTests/Breadcrumb/Breadcrumb404Test.php
@@ -17,7 +17,7 @@ class Breadcrumb404Test extends BrowserTestBase {
   /**
    * {@inheritdoc}
    */
-  public static $modules = ['system', 'block'];
+  protected static $modules = ['system', 'block'];
 
   /**
    * Tests that different 404s don't create unnecessary cache entries.
diff --git a/core/tests/Drupal/FunctionalTests/BrowserTestBaseTest.php b/core/tests/Drupal/FunctionalTests/BrowserTestBaseTest.php
index 81fa024..05b114b 100644
--- a/core/tests/Drupal/FunctionalTests/BrowserTestBaseTest.php
+++ b/core/tests/Drupal/FunctionalTests/BrowserTestBaseTest.php
@@ -18,7 +18,7 @@ class BrowserTestBaseTest extends BrowserTestBase {
    *
    * @var array
    */
-  public static $modules = array('test_page_test', 'form_test', 'system_test');
+  protected static $modules = array('test_page_test', 'form_test', 'system_test');
 
   /**
    * Tests basic page test.
diff --git a/core/tests/Drupal/FunctionalTests/Core/Config/SchemaConfigListenerTest.php b/core/tests/Drupal/FunctionalTests/Core/Config/SchemaConfigListenerTest.php
index 7138c5e..12870a4 100644
--- a/core/tests/Drupal/FunctionalTests/Core/Config/SchemaConfigListenerTest.php
+++ b/core/tests/Drupal/FunctionalTests/Core/Config/SchemaConfigListenerTest.php
@@ -17,6 +17,6 @@ class SchemaConfigListenerTest extends BrowserTestBase {
   /**
    * {@inheritdoc}
    */
-  public static $modules = array('config_test');
+  protected static $modules = array('config_test');
 
 }
diff --git a/core/tests/Drupal/FunctionalTests/Routing/PathEncodedTest.php b/core/tests/Drupal/FunctionalTests/Routing/PathEncodedTest.php
index a8aee89..8332399 100644
--- a/core/tests/Drupal/FunctionalTests/Routing/PathEncodedTest.php
+++ b/core/tests/Drupal/FunctionalTests/Routing/PathEncodedTest.php
@@ -15,7 +15,7 @@ class PathEncodedTest extends BrowserTestBase {
   /**
    * {@inheritdoc}
    */
-  public static $modules = ['system', 'path_encoded_test'];
+  protected static $modules = ['system', 'path_encoded_test'];
 
   public function testGetEncoded() {
     $route_paths = [
diff --git a/core/tests/Drupal/KernelTests/Component/Utility/SafeMarkupKernelTest.php b/core/tests/Drupal/KernelTests/Component/Utility/SafeMarkupKernelTest.php
index cd42ad1..f865ebd 100644
--- a/core/tests/Drupal/KernelTests/Component/Utility/SafeMarkupKernelTest.php
+++ b/core/tests/Drupal/KernelTests/Component/Utility/SafeMarkupKernelTest.php
@@ -16,7 +16,7 @@ class SafeMarkupKernelTest extends KernelTestBase {
   /**
    * {@inheritdoc}
    */
-  public static $modules = ['system'];
+  protected static $modules = ['system'];
 
   /**
    * {@inheritdoc}
diff --git a/core/tests/Drupal/KernelTests/Config/DefaultConfigTest.php b/core/tests/Drupal/KernelTests/Config/DefaultConfigTest.php
index 7b84b59..61dfffa 100644
--- a/core/tests/Drupal/KernelTests/Config/DefaultConfigTest.php
+++ b/core/tests/Drupal/KernelTests/Config/DefaultConfigTest.php
@@ -25,7 +25,7 @@ class DefaultConfigTest extends KernelTestBase {
   /**
    * {@inheritdoc}
    */
-  public static $modules = ['system', 'user'];
+  protected static $modules = ['system', 'user'];
 
   /**
    * The following config entries are changed on module install.
diff --git a/core/tests/Drupal/KernelTests/Core/Asset/AttachedAssetsTest.php b/core/tests/Drupal/KernelTests/Core/Asset/AttachedAssetsTest.php
index 72e7b6f..fd03d12 100644
--- a/core/tests/Drupal/KernelTests/Core/Asset/AttachedAssetsTest.php
+++ b/core/tests/Drupal/KernelTests/Core/Asset/AttachedAssetsTest.php
@@ -39,7 +39,7 @@ class AttachedAssetsTest extends KernelTestBase {
   /**
    * {@inheritdoc}
    */
-  public static $modules = array('language', 'simpletest', 'common_test', 'system');
+  protected static $modules = array('language', 'simpletest', 'common_test', 'system');
 
   /**
    * {@inheritdoc}
diff --git a/core/tests/Drupal/KernelTests/Core/Asset/ResolvedLibraryDefinitionsFilesMatchTest.php b/core/tests/Drupal/KernelTests/Core/Asset/ResolvedLibraryDefinitionsFilesMatchTest.php
index 4836e16..fd091a8 100644
--- a/core/tests/Drupal/KernelTests/Core/Asset/ResolvedLibraryDefinitionsFilesMatchTest.php
+++ b/core/tests/Drupal/KernelTests/Core/Asset/ResolvedLibraryDefinitionsFilesMatchTest.php
@@ -86,7 +86,7 @@ class ResolvedLibraryDefinitionsFilesMatchTest extends KernelTestBase {
   /**
    * {@inheritdoc}
    */
-  public static $modules = ['system'];
+  protected static $modules = ['system'];
 
   /**
    * {@inheritdoc}
diff --git a/core/tests/Drupal/KernelTests/Core/Block/MultipleBlockFormTest.php b/core/tests/Drupal/KernelTests/Core/Block/MultipleBlockFormTest.php
index 2fbe025..140621f 100644
--- a/core/tests/Drupal/KernelTests/Core/Block/MultipleBlockFormTest.php
+++ b/core/tests/Drupal/KernelTests/Core/Block/MultipleBlockFormTest.php
@@ -15,7 +15,7 @@ class MultipleBlockFormTest extends KernelTestBase {
   /**
    * {@inheritdoc}
    */
-  public static $modules = ['system', 'block', 'block_test'];
+  protected static $modules = ['system', 'block', 'block_test'];
 
   /**
    * Tests that blocks can have multiple forms.
diff --git a/core/tests/Drupal/KernelTests/Core/Bootstrap/GetFilenameTest.php b/core/tests/Drupal/KernelTests/Core/Bootstrap/GetFilenameTest.php
index 6cdc4b3..21027a8 100644
--- a/core/tests/Drupal/KernelTests/Core/Bootstrap/GetFilenameTest.php
+++ b/core/tests/Drupal/KernelTests/Core/Bootstrap/GetFilenameTest.php
@@ -14,7 +14,7 @@ class GetFilenameTest extends KernelTestBase {
   /**
    * {@inheritdoc}
    */
-  public static $modules = ['system'];
+  protected static $modules = ['system'];
 
   /**
    * Tests that drupal_get_filename() works when the file is not in database.
diff --git a/core/tests/Drupal/KernelTests/Core/Cache/CacheContextOptimizationTest.php b/core/tests/Drupal/KernelTests/Core/Cache/CacheContextOptimizationTest.php
index 0ae0230..6cfce9e 100644
--- a/core/tests/Drupal/KernelTests/Core/Cache/CacheContextOptimizationTest.php
+++ b/core/tests/Drupal/KernelTests/Core/Cache/CacheContextOptimizationTest.php
@@ -20,7 +20,7 @@ class CacheContextOptimizationTest extends KernelTestBase {
    *
    * @var string[]
    */
-  public static $modules = ['user', 'system'];
+  protected static $modules = ['user', 'system'];
 
   /**
    * {@inheritdoc}
diff --git a/core/tests/Drupal/KernelTests/Core/Cache/DatabaseBackendTagTest.php b/core/tests/Drupal/KernelTests/Core/Cache/DatabaseBackendTagTest.php
index 484ee9c..cf44bd4 100644
--- a/core/tests/Drupal/KernelTests/Core/Cache/DatabaseBackendTagTest.php
+++ b/core/tests/Drupal/KernelTests/Core/Cache/DatabaseBackendTagTest.php
@@ -19,7 +19,7 @@ class DatabaseBackendTagTest extends KernelTestBase {
    *
    * @var array
    */
-  public static $modules = array('system');
+  protected static $modules = array('system');
 
   /**
    * {@inheritdoc}
diff --git a/core/tests/Drupal/KernelTests/Core/Cache/DatabaseBackendTest.php b/core/tests/Drupal/KernelTests/Core/Cache/DatabaseBackendTest.php
index fd1c942..b1470bf 100644
--- a/core/tests/Drupal/KernelTests/Core/Cache/DatabaseBackendTest.php
+++ b/core/tests/Drupal/KernelTests/Core/Cache/DatabaseBackendTest.php
@@ -16,7 +16,7 @@ class DatabaseBackendTest extends GenericCacheBackendUnitTestBase {
    *
    * @var array
    */
-  public static $modules = array('system');
+  protected static $modules = array('system');
 
   /**
    * Creates a new instance of DatabaseBackend.
diff --git a/core/tests/Drupal/KernelTests/Core/Command/DbDumpTest.php b/core/tests/Drupal/KernelTests/Core/Command/DbDumpTest.php
index 8129410..8a94894 100644
--- a/core/tests/Drupal/KernelTests/Core/Command/DbDumpTest.php
+++ b/core/tests/Drupal/KernelTests/Core/Command/DbDumpTest.php
@@ -22,7 +22,7 @@ class DbDumpTest extends KernelTestBase {
   /**
    * {@inheritdoc}
    */
-  public static $modules = ['system', 'config', 'dblog', 'menu_link_content', 'link', 'block_content', 'file', 'user'];
+  protected static $modules = ['system', 'config', 'dblog', 'menu_link_content', 'link', 'block_content', 'file', 'user'];
 
   /**
    * Test data to write into config.
diff --git a/core/tests/Drupal/KernelTests/Core/Common/XssUnitTest.php b/core/tests/Drupal/KernelTests/Core/Common/XssUnitTest.php
index 7c68ed4..d8755b0 100644
--- a/core/tests/Drupal/KernelTests/Core/Common/XssUnitTest.php
+++ b/core/tests/Drupal/KernelTests/Core/Common/XssUnitTest.php
@@ -18,7 +18,7 @@ class XssUnitTest extends KernelTestBase {
    *
    * @var array
    */
-  public static $modules = array('filter', 'system');
+  protected static $modules = array('filter', 'system');
 
   protected function setUp() {
     parent::setUp();
diff --git a/core/tests/Drupal/KernelTests/Core/Config/CacheabilityMetadataConfigOverrideTest.php b/core/tests/Drupal/KernelTests/Core/Config/CacheabilityMetadataConfigOverrideTest.php
index c52e3ea..3882e01 100644
--- a/core/tests/Drupal/KernelTests/Core/Config/CacheabilityMetadataConfigOverrideTest.php
+++ b/core/tests/Drupal/KernelTests/Core/Config/CacheabilityMetadataConfigOverrideTest.php
@@ -15,7 +15,7 @@ class CacheabilityMetadataConfigOverrideTest extends KernelTestBase {
   /**
    * {@inheritdoc}
    */
-  public static $modules = [
+  protected static $modules = [
     'block',
     'block_content',
     'config',
diff --git a/core/tests/Drupal/KernelTests/Core/Config/ConfigCRUDTest.php b/core/tests/Drupal/KernelTests/Core/Config/ConfigCRUDTest.php
index 4664eeb..74cd02c 100644
--- a/core/tests/Drupal/KernelTests/Core/Config/ConfigCRUDTest.php
+++ b/core/tests/Drupal/KernelTests/Core/Config/ConfigCRUDTest.php
@@ -32,7 +32,7 @@ class ConfigCRUDTest extends KernelTestBase {
    *
    * @var array
    */
-  public static $modules = array('system');
+  protected static $modules = array('system');
 
   /**
    * Tests CRUD operations.
diff --git a/core/tests/Drupal/KernelTests/Core/Config/ConfigDependencyTest.php b/core/tests/Drupal/KernelTests/Core/Config/ConfigDependencyTest.php
index d30b3c5..458448e 100644
--- a/core/tests/Drupal/KernelTests/Core/Config/ConfigDependencyTest.php
+++ b/core/tests/Drupal/KernelTests/Core/Config/ConfigDependencyTest.php
@@ -19,7 +19,7 @@ class ConfigDependencyTest extends EntityKernelTestBase {
    *
    * @var array
    */
-  public static $modules = array('config_test', 'entity_test', 'user');
+  protected static $modules = array('config_test', 'entity_test', 'user');
 
   /**
    * Tests that calculating dependencies for system module.
diff --git a/core/tests/Drupal/KernelTests/Core/Config/ConfigDiffTest.php b/core/tests/Drupal/KernelTests/Core/Config/ConfigDiffTest.php
index 409b794..61d05f8 100644
--- a/core/tests/Drupal/KernelTests/Core/Config/ConfigDiffTest.php
+++ b/core/tests/Drupal/KernelTests/Core/Config/ConfigDiffTest.php
@@ -16,7 +16,7 @@ class ConfigDiffTest extends KernelTestBase {
    *
    * @var array
    */
-  public static $modules = array('config_test', 'system');
+  protected static $modules = array('config_test', 'system');
 
   /**
    * Tests calculating the difference between two sets of configuration.
diff --git a/core/tests/Drupal/KernelTests/Core/Config/ConfigEntityNormalizeTest.php b/core/tests/Drupal/KernelTests/Core/Config/ConfigEntityNormalizeTest.php
index bfa8233..319604d 100644
--- a/core/tests/Drupal/KernelTests/Core/Config/ConfigEntityNormalizeTest.php
+++ b/core/tests/Drupal/KernelTests/Core/Config/ConfigEntityNormalizeTest.php
@@ -16,7 +16,7 @@ class ConfigEntityNormalizeTest extends KernelTestBase {
    *
    * @var array
    */
-  public static $modules = array('config_test');
+  protected static $modules = array('config_test');
 
   protected function setUp() {
     parent::setUp();
diff --git a/core/tests/Drupal/KernelTests/Core/Config/ConfigEntityStaticCacheTest.php b/core/tests/Drupal/KernelTests/Core/Config/ConfigEntityStaticCacheTest.php
index 6733415..491e8c6 100644
--- a/core/tests/Drupal/KernelTests/Core/Config/ConfigEntityStaticCacheTest.php
+++ b/core/tests/Drupal/KernelTests/Core/Config/ConfigEntityStaticCacheTest.php
@@ -17,7 +17,7 @@ class ConfigEntityStaticCacheTest extends KernelTestBase {
    *
    * @var array
    */
-  public static $modules = array('config_test', 'config_entity_static_cache_test');
+  protected static $modules = array('config_test', 'config_entity_static_cache_test');
 
   /**
    * The type ID of the entity under test.
diff --git a/core/tests/Drupal/KernelTests/Core/Config/ConfigEntityStatusTest.php b/core/tests/Drupal/KernelTests/Core/Config/ConfigEntityStatusTest.php
index 14765ef..21681b1 100644
--- a/core/tests/Drupal/KernelTests/Core/Config/ConfigEntityStatusTest.php
+++ b/core/tests/Drupal/KernelTests/Core/Config/ConfigEntityStatusTest.php
@@ -16,7 +16,7 @@ class ConfigEntityStatusTest extends KernelTestBase {
    *
    * @var array
    */
-  public static $modules = array('config_test');
+  protected static $modules = array('config_test');
 
   /**
    * Tests the enabling/disabling of entities.
diff --git a/core/tests/Drupal/KernelTests/Core/Config/ConfigEntityStorageTest.php b/core/tests/Drupal/KernelTests/Core/Config/ConfigEntityStorageTest.php
index 5b7022a..9ed9675 100644
--- a/core/tests/Drupal/KernelTests/Core/Config/ConfigEntityStorageTest.php
+++ b/core/tests/Drupal/KernelTests/Core/Config/ConfigEntityStorageTest.php
@@ -18,7 +18,7 @@ class ConfigEntityStorageTest extends KernelTestBase {
    *
    * @var array
    */
-  public static $modules = array('config_test');
+  protected static $modules = array('config_test');
 
   /**
    * Tests creating configuration entities with changed UUIDs.
diff --git a/core/tests/Drupal/KernelTests/Core/Config/ConfigEntityUnitTest.php b/core/tests/Drupal/KernelTests/Core/Config/ConfigEntityUnitTest.php
index 23251cc..5fc9f4f 100644
--- a/core/tests/Drupal/KernelTests/Core/Config/ConfigEntityUnitTest.php
+++ b/core/tests/Drupal/KernelTests/Core/Config/ConfigEntityUnitTest.php
@@ -25,7 +25,7 @@ class ConfigEntityUnitTest extends KernelTestBase {
    *
    * @var array
    */
-  public static $modules = array('config_test');
+  protected static $modules = array('config_test');
 
   /**
    * The config_test entity storage.
diff --git a/core/tests/Drupal/KernelTests/Core/Config/ConfigEventsTest.php b/core/tests/Drupal/KernelTests/Core/Config/ConfigEventsTest.php
index 7c06805..d8c069a 100644
--- a/core/tests/Drupal/KernelTests/Core/Config/ConfigEventsTest.php
+++ b/core/tests/Drupal/KernelTests/Core/Config/ConfigEventsTest.php
@@ -18,7 +18,7 @@ class ConfigEventsTest extends KernelTestBase {
    *
    * @var array
    */
-  public static $modules = array('config_events_test');
+  protected static $modules = array('config_events_test');
 
   /**
    * Tests configuration events.
diff --git a/core/tests/Drupal/KernelTests/Core/Config/ConfigImportRecreateTest.php b/core/tests/Drupal/KernelTests/Core/Config/ConfigImportRecreateTest.php
index 570ca4c..f941be1 100644
--- a/core/tests/Drupal/KernelTests/Core/Config/ConfigImportRecreateTest.php
+++ b/core/tests/Drupal/KernelTests/Core/Config/ConfigImportRecreateTest.php
@@ -27,7 +27,7 @@ class ConfigImportRecreateTest extends KernelTestBase {
    *
    * @var array
    */
-  public static $modules = ['system', 'field', 'text', 'user', 'node'];
+  protected static $modules = ['system', 'field', 'text', 'user', 'node'];
 
   protected function setUp() {
     parent::setUp();
diff --git a/core/tests/Drupal/KernelTests/Core/Config/ConfigImportRenameValidationTest.php b/core/tests/Drupal/KernelTests/Core/Config/ConfigImportRenameValidationTest.php
index 48b9c46..91880d6 100644
--- a/core/tests/Drupal/KernelTests/Core/Config/ConfigImportRenameValidationTest.php
+++ b/core/tests/Drupal/KernelTests/Core/Config/ConfigImportRenameValidationTest.php
@@ -30,7 +30,7 @@ class ConfigImportRenameValidationTest extends KernelTestBase {
    *
    * @var array
    */
-  public static $modules = ['system', 'user', 'node', 'field', 'text', 'config_test'];
+  protected static $modules = ['system', 'user', 'node', 'field', 'text', 'config_test'];
 
   /**
    * {@inheritdoc}
diff --git a/core/tests/Drupal/KernelTests/Core/Config/ConfigImporterMissingContentTest.php b/core/tests/Drupal/KernelTests/Core/Config/ConfigImporterMissingContentTest.php
index 55f6481..59e9fd8 100644
--- a/core/tests/Drupal/KernelTests/Core/Config/ConfigImporterMissingContentTest.php
+++ b/core/tests/Drupal/KernelTests/Core/Config/ConfigImporterMissingContentTest.php
@@ -26,7 +26,7 @@ class ConfigImporterMissingContentTest extends KernelTestBase {
    *
    * @var array
    */
-  public static $modules = array('system', 'user', 'entity_test', 'config_test', 'config_import_test');
+  protected static $modules = array('system', 'user', 'entity_test', 'config_test', 'config_import_test');
 
   protected function setUp() {
     parent::setUp();
diff --git a/core/tests/Drupal/KernelTests/Core/Config/ConfigImporterTest.php b/core/tests/Drupal/KernelTests/Core/Config/ConfigImporterTest.php
index 945e994..b63afcf 100644
--- a/core/tests/Drupal/KernelTests/Core/Config/ConfigImporterTest.php
+++ b/core/tests/Drupal/KernelTests/Core/Config/ConfigImporterTest.php
@@ -28,7 +28,7 @@ class ConfigImporterTest extends KernelTestBase {
    *
    * @var array
    */
-  public static $modules = array('config_test', 'system', 'config_import_test');
+  protected static $modules = array('config_test', 'system', 'config_import_test');
 
   protected function setUp() {
     parent::setUp();
diff --git a/core/tests/Drupal/KernelTests/Core/Config/ConfigInstallTest.php b/core/tests/Drupal/KernelTests/Core/Config/ConfigInstallTest.php
index 10cac18..9c2a31b 100644
--- a/core/tests/Drupal/KernelTests/Core/Config/ConfigInstallTest.php
+++ b/core/tests/Drupal/KernelTests/Core/Config/ConfigInstallTest.php
@@ -18,7 +18,7 @@ class ConfigInstallTest extends KernelTestBase {
   /**
    * {@inheritdoc}
    */
-  public static $modules = ['system'];
+  protected static $modules = ['system'];
 
   /**
    * {@inheritdoc}
diff --git a/core/tests/Drupal/KernelTests/Core/Config/ConfigLanguageOverrideTest.php b/core/tests/Drupal/KernelTests/Core/Config/ConfigLanguageOverrideTest.php
index 994406c..0f2a740 100644
--- a/core/tests/Drupal/KernelTests/Core/Config/ConfigLanguageOverrideTest.php
+++ b/core/tests/Drupal/KernelTests/Core/Config/ConfigLanguageOverrideTest.php
@@ -17,7 +17,7 @@ class ConfigLanguageOverrideTest extends KernelTestBase {
    *
    * @var array
    */
-  public static $modules = array('user', 'language', 'config_test', 'system', 'field');
+  protected static $modules = array('user', 'language', 'config_test', 'system', 'field');
 
   /**
    * {@inheritdoc}
diff --git a/core/tests/Drupal/KernelTests/Core/Config/ConfigModuleOverridesTest.php b/core/tests/Drupal/KernelTests/Core/Config/ConfigModuleOverridesTest.php
index 1310cb3..e8987a9 100644
--- a/core/tests/Drupal/KernelTests/Core/Config/ConfigModuleOverridesTest.php
+++ b/core/tests/Drupal/KernelTests/Core/Config/ConfigModuleOverridesTest.php
@@ -16,7 +16,7 @@ class ConfigModuleOverridesTest extends KernelTestBase {
    *
    * @var array
    */
-  public static $modules = array('system', 'config', 'config_override_test');
+  protected static $modules = array('system', 'config', 'config_override_test');
 
   public function testSimpleModuleOverrides() {
     $GLOBALS['config_test_run_module_overrides'] = TRUE;
diff --git a/core/tests/Drupal/KernelTests/Core/Config/ConfigOverrideTest.php b/core/tests/Drupal/KernelTests/Core/Config/ConfigOverrideTest.php
index 914adcf..527befa 100644
--- a/core/tests/Drupal/KernelTests/Core/Config/ConfigOverrideTest.php
+++ b/core/tests/Drupal/KernelTests/Core/Config/ConfigOverrideTest.php
@@ -16,7 +16,7 @@ class ConfigOverrideTest extends KernelTestBase {
    *
    * @var array
    */
-  public static $modules = array('system', 'config_test');
+  protected static $modules = array('system', 'config_test');
 
   protected function setUp() {
     parent::setUp();
diff --git a/core/tests/Drupal/KernelTests/Core/Config/ConfigOverridesPriorityTest.php b/core/tests/Drupal/KernelTests/Core/Config/ConfigOverridesPriorityTest.php
index f18bf3c..2e7a229 100644
--- a/core/tests/Drupal/KernelTests/Core/Config/ConfigOverridesPriorityTest.php
+++ b/core/tests/Drupal/KernelTests/Core/Config/ConfigOverridesPriorityTest.php
@@ -18,7 +18,7 @@ class ConfigOverridesPriorityTest extends KernelTestBase {
    *
    * @var array
    */
-  public static $modules = array('system', 'config', 'config_override_test', 'language');
+  protected static $modules = array('system', 'config', 'config_override_test', 'language');
 
   public function testOverridePriorities() {
     $GLOBALS['config_test_run_module_overrides'] = FALSE;
diff --git a/core/tests/Drupal/KernelTests/Core/Config/ConfigSchemaTest.php b/core/tests/Drupal/KernelTests/Core/Config/ConfigSchemaTest.php
index ae3abdd..0932e49 100644
--- a/core/tests/Drupal/KernelTests/Core/Config/ConfigSchemaTest.php
+++ b/core/tests/Drupal/KernelTests/Core/Config/ConfigSchemaTest.php
@@ -21,7 +21,7 @@ class ConfigSchemaTest extends KernelTestBase {
    *
    * @var array
    */
-  public static $modules = array('system', 'language', 'field', 'image', 'config_test', 'config_schema_test');
+  protected static $modules = array('system', 'language', 'field', 'image', 'config_test', 'config_schema_test');
 
   /**
    * {@inheritdoc}
diff --git a/core/tests/Drupal/KernelTests/Core/Config/ConfigSnapshotTest.php b/core/tests/Drupal/KernelTests/Core/Config/ConfigSnapshotTest.php
index efac2dd..98891b1 100644
--- a/core/tests/Drupal/KernelTests/Core/Config/ConfigSnapshotTest.php
+++ b/core/tests/Drupal/KernelTests/Core/Config/ConfigSnapshotTest.php
@@ -17,7 +17,7 @@ class ConfigSnapshotTest extends KernelTestBase {
    *
    * @var array
    */
-  public static $modules = array('config_test', 'system');
+  protected static $modules = array('config_test', 'system');
 
   /**
    * {@inheritdoc}
diff --git a/core/tests/Drupal/KernelTests/Core/Config/DefaultConfigTest.php b/core/tests/Drupal/KernelTests/Core/Config/DefaultConfigTest.php
index a8f9ef5..415102f 100644
--- a/core/tests/Drupal/KernelTests/Core/Config/DefaultConfigTest.php
+++ b/core/tests/Drupal/KernelTests/Core/Config/DefaultConfigTest.php
@@ -23,7 +23,7 @@ class DefaultConfigTest extends KernelTestBase {
    *
    * @var array
    */
-  public static $modules = array('system', 'config_test');
+  protected static $modules = array('system', 'config_test');
 
   /**
    * Themes which provide default configuration and need enabling.
diff --git a/core/tests/Drupal/KernelTests/Core/Config/SchemaCheckTraitTest.php b/core/tests/Drupal/KernelTests/Core/Config/SchemaCheckTraitTest.php
index 15aecaa..b083197 100644
--- a/core/tests/Drupal/KernelTests/Core/Config/SchemaCheckTraitTest.php
+++ b/core/tests/Drupal/KernelTests/Core/Config/SchemaCheckTraitTest.php
@@ -27,7 +27,7 @@ class SchemaCheckTraitTest extends KernelTestBase {
    *
    * @var array
    */
-  public static $modules = array('config_test', 'config_schema_test');
+  protected static $modules = array('config_test', 'config_schema_test');
 
   /**
    * {@inheritdoc}
diff --git a/core/tests/Drupal/KernelTests/Core/Config/SchemaConfigListenerTest.php b/core/tests/Drupal/KernelTests/Core/Config/SchemaConfigListenerTest.php
index f078021..22d950c 100644
--- a/core/tests/Drupal/KernelTests/Core/Config/SchemaConfigListenerTest.php
+++ b/core/tests/Drupal/KernelTests/Core/Config/SchemaConfigListenerTest.php
@@ -17,7 +17,7 @@ class SchemaConfigListenerTest extends KernelTestBase {
   /**
    * {@inheritdoc}
    */
-  public static $modules = array('config_test');
+  protected static $modules = array('config_test');
 
   /**
    * {@inheritdoc}
diff --git a/core/tests/Drupal/KernelTests/Core/Database/DatabaseTestBase.php b/core/tests/Drupal/KernelTests/Core/Database/DatabaseTestBase.php
index f8c8c3d..593d344 100644
--- a/core/tests/Drupal/KernelTests/Core/Database/DatabaseTestBase.php
+++ b/core/tests/Drupal/KernelTests/Core/Database/DatabaseTestBase.php
@@ -12,7 +12,7 @@
  */
 abstract class DatabaseTestBase extends KernelTestBase {
 
-  public static $modules = array('database_test');
+  protected static $modules = array('database_test');
 
   protected function setUp() {
     parent::setUp();
diff --git a/core/tests/Drupal/KernelTests/Core/Database/NextIdTest.php b/core/tests/Drupal/KernelTests/Core/Database/NextIdTest.php
index b0cdc85..15faf2d 100644
--- a/core/tests/Drupal/KernelTests/Core/Database/NextIdTest.php
+++ b/core/tests/Drupal/KernelTests/Core/Database/NextIdTest.php
@@ -15,7 +15,7 @@ class NextIdTest extends KernelTestBase {
    * The modules to enable.
    * @var array
    */
-  public static $modules = array('system');
+  protected static $modules = array('system');
 
   protected function setUp() {
     parent::setUp();
diff --git a/core/tests/Drupal/KernelTests/Core/Database/RangeQueryTest.php b/core/tests/Drupal/KernelTests/Core/Database/RangeQueryTest.php
index 33f315b..9ef9f86 100644
--- a/core/tests/Drupal/KernelTests/Core/Database/RangeQueryTest.php
+++ b/core/tests/Drupal/KernelTests/Core/Database/RangeQueryTest.php
@@ -14,7 +14,7 @@ class RangeQueryTest extends DatabaseTestBase {
    *
    * @var array
    */
-  public static $modules = array('database_test');
+  protected static $modules = array('database_test');
 
   /**
    * Confirms that range queries work and return the correct result.
diff --git a/core/tests/Drupal/KernelTests/Core/Database/RegressionTest.php b/core/tests/Drupal/KernelTests/Core/Database/RegressionTest.php
index e13bcfe..0ee6aab 100644
--- a/core/tests/Drupal/KernelTests/Core/Database/RegressionTest.php
+++ b/core/tests/Drupal/KernelTests/Core/Database/RegressionTest.php
@@ -14,7 +14,7 @@ class RegressionTest extends DatabaseTestBase {
    *
    * @var array
    */
-  public static $modules = array('node', 'user');
+  protected static $modules = array('node', 'user');
 
   /**
    * Ensures that non-ASCII UTF-8 data is stored in the database properly.
diff --git a/core/tests/Drupal/KernelTests/Core/Database/SelectComplexTest.php b/core/tests/Drupal/KernelTests/Core/Database/SelectComplexTest.php
index d6da254..657daba 100644
--- a/core/tests/Drupal/KernelTests/Core/Database/SelectComplexTest.php
+++ b/core/tests/Drupal/KernelTests/Core/Database/SelectComplexTest.php
@@ -18,7 +18,7 @@ class SelectComplexTest extends DatabaseTestBase {
    *
    * @var array
    */
-  public static $modules = array('system', 'user', 'node_access_test', 'field');
+  protected static $modules = array('system', 'user', 'node_access_test', 'field');
 
   /**
    * Tests simple JOIN statements.
diff --git a/core/tests/Drupal/KernelTests/Core/Datetime/FormatDateTest.php b/core/tests/Drupal/KernelTests/Core/Datetime/FormatDateTest.php
index 5fbb4df..c02f565 100644
--- a/core/tests/Drupal/KernelTests/Core/Datetime/FormatDateTest.php
+++ b/core/tests/Drupal/KernelTests/Core/Datetime/FormatDateTest.php
@@ -15,7 +15,7 @@ class FormatDateTest extends KernelTestBase {
   /**
    * {@inheritdoc}
    */
-  public static $modules = ['language', 'system'];
+  protected static $modules = ['language', 'system'];
 
   /**
    * Arbitrary langcode for a custom language.
diff --git a/core/tests/Drupal/KernelTests/Core/Element/PathElementFormTest.php b/core/tests/Drupal/KernelTests/Core/Element/PathElementFormTest.php
index ca4e501..a641a00 100644
--- a/core/tests/Drupal/KernelTests/Core/Element/PathElementFormTest.php
+++ b/core/tests/Drupal/KernelTests/Core/Element/PathElementFormTest.php
@@ -30,7 +30,7 @@ class PathElementFormTest extends KernelTestBase implements FormInterface {
    *
    * @var array
    */
-  public static $modules = array('system', 'user');
+  protected static $modules = array('system', 'user');
 
   /**
    * Sets up the test.
diff --git a/core/tests/Drupal/KernelTests/Core/Entity/BundleConstraintValidatorTest.php b/core/tests/Drupal/KernelTests/Core/Entity/BundleConstraintValidatorTest.php
index 2219487..ef9a9aa 100644
--- a/core/tests/Drupal/KernelTests/Core/Entity/BundleConstraintValidatorTest.php
+++ b/core/tests/Drupal/KernelTests/Core/Entity/BundleConstraintValidatorTest.php
@@ -19,7 +19,7 @@ class BundleConstraintValidatorTest extends KernelTestBase {
    */
   protected $typedData;
 
-  public static $modules = array('node', 'field', 'text', 'user');
+  protected static $modules = array('node', 'field', 'text', 'user');
 
   protected function setUp() {
     parent::setUp();
diff --git a/core/tests/Drupal/KernelTests/Core/Entity/ConfigEntityQueryTest.php b/core/tests/Drupal/KernelTests/Core/Entity/ConfigEntityQueryTest.php
index 22cae65..06ac92e 100644
--- a/core/tests/Drupal/KernelTests/Core/Entity/ConfigEntityQueryTest.php
+++ b/core/tests/Drupal/KernelTests/Core/Entity/ConfigEntityQueryTest.php
@@ -19,7 +19,7 @@ class ConfigEntityQueryTest extends KernelTestBase {
    *
    * @var array
    */
-  public static $modules = array('config_test');
+  protected static $modules = array('config_test');
 
   /**
    * Stores the search results for alter comparison.
diff --git a/core/tests/Drupal/KernelTests/Core/Entity/ContentEntityChangedTest.php b/core/tests/Drupal/KernelTests/Core/Entity/ContentEntityChangedTest.php
index 51a204f..e808f48 100644
--- a/core/tests/Drupal/KernelTests/Core/Entity/ContentEntityChangedTest.php
+++ b/core/tests/Drupal/KernelTests/Core/Entity/ContentEntityChangedTest.php
@@ -18,7 +18,7 @@ class ContentEntityChangedTest extends EntityKernelTestBase {
    *
    * @var array
    */
-  public static $modules = ['language', 'user', 'system', 'field', 'text', 'filter', 'entity_test'];
+  protected static $modules = ['language', 'user', 'system', 'field', 'text', 'filter', 'entity_test'];
 
   /**
    * The EntityTestMulChanged entity type storage.
diff --git a/core/tests/Drupal/KernelTests/Core/Entity/ContentEntityCloneTest.php b/core/tests/Drupal/KernelTests/Core/Entity/ContentEntityCloneTest.php
index cca7eb1..6ca54fe 100644
--- a/core/tests/Drupal/KernelTests/Core/Entity/ContentEntityCloneTest.php
+++ b/core/tests/Drupal/KernelTests/Core/Entity/ContentEntityCloneTest.php
@@ -15,7 +15,7 @@ class ContentEntityCloneTest extends EntityKernelTestBase {
   /**
    * {@inheritdoc}
    */
-  public static $modules = ['language', 'entity_test'];
+  protected static $modules = ['language', 'entity_test'];
 
   /**
    * {@inheritdoc}
diff --git a/core/tests/Drupal/KernelTests/Core/Entity/ContentEntityFieldMethodInvocationOrderTest.php b/core/tests/Drupal/KernelTests/Core/Entity/ContentEntityFieldMethodInvocationOrderTest.php
index 5e25c90..dda9da2 100644
--- a/core/tests/Drupal/KernelTests/Core/Entity/ContentEntityFieldMethodInvocationOrderTest.php
+++ b/core/tests/Drupal/KernelTests/Core/Entity/ContentEntityFieldMethodInvocationOrderTest.php
@@ -16,7 +16,7 @@ class ContentEntityFieldMethodInvocationOrderTest extends EntityKernelTestBase {
    *
    * @var array
    */
-  public static $modules = ['language', 'system', 'entity_test'];
+  protected static $modules = ['language', 'system', 'entity_test'];
 
   /**
    * The EntityTest entity type storage.
diff --git a/core/tests/Drupal/KernelTests/Core/Entity/ContentEntityNonRevisionableFieldTest.php b/core/tests/Drupal/KernelTests/Core/Entity/ContentEntityNonRevisionableFieldTest.php
index 73684e9..e9d9310 100644
--- a/core/tests/Drupal/KernelTests/Core/Entity/ContentEntityNonRevisionableFieldTest.php
+++ b/core/tests/Drupal/KernelTests/Core/Entity/ContentEntityNonRevisionableFieldTest.php
@@ -18,7 +18,7 @@ class ContentEntityNonRevisionableFieldTest extends EntityKernelTestBase {
    *
    * @var array
    */
-  public static $modules = ['language'];
+  protected static $modules = ['language'];
 
   /**
    * The EntityTestMulRev entity type storage.
diff --git a/core/tests/Drupal/KernelTests/Core/Entity/ContentEntityNullStorageTest.php b/core/tests/Drupal/KernelTests/Core/Entity/ContentEntityNullStorageTest.php
index 51162fc..0c17ee4 100644
--- a/core/tests/Drupal/KernelTests/Core/Entity/ContentEntityNullStorageTest.php
+++ b/core/tests/Drupal/KernelTests/Core/Entity/ContentEntityNullStorageTest.php
@@ -22,7 +22,7 @@ class ContentEntityNullStorageTest extends KernelTestBase {
    *
    * @var array
    */
-  public static $modules = array('system', 'contact', 'user');
+  protected static $modules = array('system', 'contact', 'user');
 
   /**
    * Tests using entity query with ContentEntityNullStorage.
diff --git a/core/tests/Drupal/KernelTests/Core/Entity/DefaultTableMappingIntegrationTest.php b/core/tests/Drupal/KernelTests/Core/Entity/DefaultTableMappingIntegrationTest.php
index 8f945b3..e3bd777 100644
--- a/core/tests/Drupal/KernelTests/Core/Entity/DefaultTableMappingIntegrationTest.php
+++ b/core/tests/Drupal/KernelTests/Core/Entity/DefaultTableMappingIntegrationTest.php
@@ -26,7 +26,7 @@ class DefaultTableMappingIntegrationTest extends EntityKernelTestBase {
   /**
    * {@inheritdoc}
    */
-  public static $modules = ['entity_test_extra'];
+  protected static $modules = ['entity_test_extra'];
 
   /**
    * {@inheritdoc}
diff --git a/core/tests/Drupal/KernelTests/Core/Entity/EntityBundleFieldTest.php b/core/tests/Drupal/KernelTests/Core/Entity/EntityBundleFieldTest.php
index ec8fd1c..a536352 100644
--- a/core/tests/Drupal/KernelTests/Core/Entity/EntityBundleFieldTest.php
+++ b/core/tests/Drupal/KernelTests/Core/Entity/EntityBundleFieldTest.php
@@ -14,7 +14,7 @@ class EntityBundleFieldTest extends EntityKernelTestBase {
    *
    * @var array
    */
-  public static $modules = array('entity_schema_test');
+  protected static $modules = array('entity_schema_test');
 
   /**
    * The module handler.
diff --git a/core/tests/Drupal/KernelTests/Core/Entity/EntityCrudHookTest.php b/core/tests/Drupal/KernelTests/Core/Entity/EntityCrudHookTest.php
index 935fd7a..fe4eba1 100644
--- a/core/tests/Drupal/KernelTests/Core/Entity/EntityCrudHookTest.php
+++ b/core/tests/Drupal/KernelTests/Core/Entity/EntityCrudHookTest.php
@@ -40,7 +40,7 @@ class EntityCrudHookTest extends EntityKernelTestBase {
    *
    * @var array
    */
-  public static $modules = array('block', 'block_test', 'entity_crud_hook_test', 'file', 'taxonomy', 'node', 'comment');
+  protected static $modules = array('block', 'block_test', 'entity_crud_hook_test', 'file', 'taxonomy', 'node', 'comment');
 
   protected $ids = array();
 
diff --git a/core/tests/Drupal/KernelTests/Core/Entity/EntityDisplayBaseTest.php b/core/tests/Drupal/KernelTests/Core/Entity/EntityDisplayBaseTest.php
index 137201a..f681292 100644
--- a/core/tests/Drupal/KernelTests/Core/Entity/EntityDisplayBaseTest.php
+++ b/core/tests/Drupal/KernelTests/Core/Entity/EntityDisplayBaseTest.php
@@ -15,7 +15,7 @@ class EntityDisplayBaseTest extends KernelTestBase {
   /**
    * {@inheritdoc}
    */
-  public static $modules = ['entity_test'];
+  protected static $modules = ['entity_test'];
 
   /**
    * @covers ::preSave
diff --git a/core/tests/Drupal/KernelTests/Core/Entity/EntityDisplayFormBaseTest.php b/core/tests/Drupal/KernelTests/Core/Entity/EntityDisplayFormBaseTest.php
index 11aeede..dbfc7d2 100644
--- a/core/tests/Drupal/KernelTests/Core/Entity/EntityDisplayFormBaseTest.php
+++ b/core/tests/Drupal/KernelTests/Core/Entity/EntityDisplayFormBaseTest.php
@@ -17,7 +17,7 @@ class EntityDisplayFormBaseTest extends KernelTestBase {
   /**
    * {@inheritdoc}
    */
-  public static $modules = ['entity_test'];
+  protected static $modules = ['entity_test'];
 
   /**
    * @covers ::copyFormValuesToEntity
diff --git a/core/tests/Drupal/KernelTests/Core/Entity/EntityFieldTest.php b/core/tests/Drupal/KernelTests/Core/Entity/EntityFieldTest.php
index 56af888..d294791 100644
--- a/core/tests/Drupal/KernelTests/Core/Entity/EntityFieldTest.php
+++ b/core/tests/Drupal/KernelTests/Core/Entity/EntityFieldTest.php
@@ -30,7 +30,7 @@ class EntityFieldTest extends EntityKernelTestBase {
    *
    * @var array
    */
-  public static $modules = array('filter', 'text', 'node', 'user', 'field_test');
+  protected static $modules = array('filter', 'text', 'node', 'user', 'field_test');
 
   /**
    * @var string
diff --git a/core/tests/Drupal/KernelTests/Core/Entity/EntityKernelTestBase.php b/core/tests/Drupal/KernelTests/Core/Entity/EntityKernelTestBase.php
index 4b08a56..0a221fa 100644
--- a/core/tests/Drupal/KernelTests/Core/Entity/EntityKernelTestBase.php
+++ b/core/tests/Drupal/KernelTests/Core/Entity/EntityKernelTestBase.php
@@ -17,7 +17,7 @@
    *
    * @var array
    */
-  public static $modules = ['user', 'system', 'field', 'text', 'filter', 'entity_test'];
+  protected static $modules = ['user', 'system', 'field', 'text', 'filter', 'entity_test'];
 
   /**
    * The entity manager service.
diff --git a/core/tests/Drupal/KernelTests/Core/Entity/EntityLanguageTestBase.php b/core/tests/Drupal/KernelTests/Core/Entity/EntityLanguageTestBase.php
index 59510ba..3038004 100644
--- a/core/tests/Drupal/KernelTests/Core/Entity/EntityLanguageTestBase.php
+++ b/core/tests/Drupal/KernelTests/Core/Entity/EntityLanguageTestBase.php
@@ -40,7 +40,7 @@
    */
   protected $untranslatableFieldName;
 
-  public static $modules = array('language', 'entity_test');
+  protected static $modules = array('language', 'entity_test');
 
   protected function setUp() {
     parent::setUp();
diff --git a/core/tests/Drupal/KernelTests/Core/Entity/EntityNonRevisionableTranslatableFieldTest.php b/core/tests/Drupal/KernelTests/Core/Entity/EntityNonRevisionableTranslatableFieldTest.php
index da6ec66..91142f7 100644
--- a/core/tests/Drupal/KernelTests/Core/Entity/EntityNonRevisionableTranslatableFieldTest.php
+++ b/core/tests/Drupal/KernelTests/Core/Entity/EntityNonRevisionableTranslatableFieldTest.php
@@ -14,7 +14,7 @@ class EntityNonRevisionableTranslatableFieldTest extends EntityKernelTestBase {
   /**
    * {@inheritdoc}
    */
-  public static $modules = array('entity_test', 'language', 'content_translation');
+  protected static $modules = array('entity_test', 'language', 'content_translation');
 
   protected function setUp() {
     parent::setUp();
diff --git a/core/tests/Drupal/KernelTests/Core/Entity/EntityQueryAggregateTest.php b/core/tests/Drupal/KernelTests/Core/Entity/EntityQueryAggregateTest.php
index 819445d..9c49e02 100644
--- a/core/tests/Drupal/KernelTests/Core/Entity/EntityQueryAggregateTest.php
+++ b/core/tests/Drupal/KernelTests/Core/Entity/EntityQueryAggregateTest.php
@@ -18,7 +18,7 @@ class EntityQueryAggregateTest extends EntityKernelTestBase {
    *
    * @var array
    */
-  public static $modules = array();
+  protected static $modules = array();
 
   /**
    * The entity_test storage to create the test entities.
diff --git a/core/tests/Drupal/KernelTests/Core/Entity/EntityQueryRelationshipTest.php b/core/tests/Drupal/KernelTests/Core/Entity/EntityQueryRelationshipTest.php
index 8465438..97e794d 100644
--- a/core/tests/Drupal/KernelTests/Core/Entity/EntityQueryRelationshipTest.php
+++ b/core/tests/Drupal/KernelTests/Core/Entity/EntityQueryRelationshipTest.php
@@ -21,7 +21,7 @@ class EntityQueryRelationshipTest extends EntityKernelTestBase {
    *
    * @var array
    */
-  public static $modules = array('taxonomy');
+  protected static $modules = array('taxonomy');
 
   /**
    * @var \Drupal\Core\Entity\Query\QueryFactory
diff --git a/core/tests/Drupal/KernelTests/Core/Entity/EntityQueryTest.php b/core/tests/Drupal/KernelTests/Core/Entity/EntityQueryTest.php
index 8c79c5c..2dc8a58 100644
--- a/core/tests/Drupal/KernelTests/Core/Entity/EntityQueryTest.php
+++ b/core/tests/Drupal/KernelTests/Core/Entity/EntityQueryTest.php
@@ -24,7 +24,7 @@ class EntityQueryTest extends EntityKernelTestBase {
    *
    * @var array
    */
-  public static $modules = array('field_test', 'language');
+  protected static $modules = array('field_test', 'language');
 
   /**
    * @var array
diff --git a/core/tests/Drupal/KernelTests/Core/Entity/EntityReferenceFieldTest.php b/core/tests/Drupal/KernelTests/Core/Entity/EntityReferenceFieldTest.php
index 8f2239d..a6489ef 100644
--- a/core/tests/Drupal/KernelTests/Core/Entity/EntityReferenceFieldTest.php
+++ b/core/tests/Drupal/KernelTests/Core/Entity/EntityReferenceFieldTest.php
@@ -59,7 +59,7 @@ class EntityReferenceFieldTest extends EntityKernelTestBase {
    *
    * @var array
    */
-  public static $modules = array('entity_reference_test');
+  protected static $modules = array('entity_reference_test');
 
   /**
    * {@inheritdoc}
diff --git a/core/tests/Drupal/KernelTests/Core/Entity/EntityReferenceSelection/EntityReferenceSelectionSortTest.php b/core/tests/Drupal/KernelTests/Core/Entity/EntityReferenceSelection/EntityReferenceSelectionSortTest.php
index f51c8ea..1a266bf 100644
--- a/core/tests/Drupal/KernelTests/Core/Entity/EntityReferenceSelection/EntityReferenceSelectionSortTest.php
+++ b/core/tests/Drupal/KernelTests/Core/Entity/EntityReferenceSelection/EntityReferenceSelectionSortTest.php
@@ -21,7 +21,7 @@ class EntityReferenceSelectionSortTest extends EntityKernelTestBase {
    *
    * @var array
    */
-  public static $modules = array('node');
+  protected static $modules = array('node');
 
   protected function setUp() {
     parent::setUp();
diff --git a/core/tests/Drupal/KernelTests/Core/Entity/EntityRevisionTranslationTest.php b/core/tests/Drupal/KernelTests/Core/Entity/EntityRevisionTranslationTest.php
index 676a98a..1ac6cf8 100644
--- a/core/tests/Drupal/KernelTests/Core/Entity/EntityRevisionTranslationTest.php
+++ b/core/tests/Drupal/KernelTests/Core/Entity/EntityRevisionTranslationTest.php
@@ -15,7 +15,7 @@ class EntityRevisionTranslationTest extends EntityKernelTestBase {
   /**
    * {@inheritdoc}
    */
-  public static $modules = ['language'];
+  protected static $modules = ['language'];
 
   /**
    * {@inheritdoc}
diff --git a/core/tests/Drupal/KernelTests/Core/Entity/EntityTypeConstraintValidatorTest.php b/core/tests/Drupal/KernelTests/Core/Entity/EntityTypeConstraintValidatorTest.php
index 87d76b4..80d3940 100644
--- a/core/tests/Drupal/KernelTests/Core/Entity/EntityTypeConstraintValidatorTest.php
+++ b/core/tests/Drupal/KernelTests/Core/Entity/EntityTypeConstraintValidatorTest.php
@@ -18,7 +18,7 @@ class EntityTypeConstraintValidatorTest extends EntityKernelTestBase {
    */
   protected $typedData;
 
-  public static $modules = array('node', 'field', 'user');
+  protected static $modules = array('node', 'field', 'user');
 
   protected function setUp() {
     parent::setUp();
diff --git a/core/tests/Drupal/KernelTests/Core/Entity/EntityTypedDataDefinitionTest.php b/core/tests/Drupal/KernelTests/Core/Entity/EntityTypedDataDefinitionTest.php
index b61a6dd..6d24c87 100644
--- a/core/tests/Drupal/KernelTests/Core/Entity/EntityTypedDataDefinitionTest.php
+++ b/core/tests/Drupal/KernelTests/Core/Entity/EntityTypedDataDefinitionTest.php
@@ -31,7 +31,7 @@ class EntityTypedDataDefinitionTest extends KernelTestBase {
    *
    * @var array
    */
-  public static $modules = array('filter', 'text', 'node', 'user');
+  protected static $modules = array('filter', 'text', 'node', 'user');
 
   protected function setUp() {
     parent::setup();
diff --git a/core/tests/Drupal/KernelTests/Core/Entity/EntityValidationTest.php b/core/tests/Drupal/KernelTests/Core/Entity/EntityValidationTest.php
index dc7d94f..8714156 100644
--- a/core/tests/Drupal/KernelTests/Core/Entity/EntityValidationTest.php
+++ b/core/tests/Drupal/KernelTests/Core/Entity/EntityValidationTest.php
@@ -16,7 +16,7 @@ class EntityValidationTest extends EntityKernelTestBase {
    *
    * @var array
    */
-  public static $modules = array('filter', 'text');
+  protected static $modules = array('filter', 'text');
 
   /**
    * @var string
diff --git a/core/tests/Drupal/KernelTests/Core/Entity/FieldSqlStorageTest.php b/core/tests/Drupal/KernelTests/Core/Entity/FieldSqlStorageTest.php
index 449f3f2..5f4b70d 100644
--- a/core/tests/Drupal/KernelTests/Core/Entity/FieldSqlStorageTest.php
+++ b/core/tests/Drupal/KernelTests/Core/Entity/FieldSqlStorageTest.php
@@ -23,7 +23,7 @@ class FieldSqlStorageTest extends EntityKernelTestBase {
    *
    * @var array
    */
-  public static $modules = array('field', 'field_test', 'text', 'entity_test');
+  protected static $modules = array('field', 'field_test', 'text', 'entity_test');
 
   /**
    * The name of the created field.
diff --git a/core/tests/Drupal/KernelTests/Core/Entity/FieldWidgetConstraintValidatorTest.php b/core/tests/Drupal/KernelTests/Core/Entity/FieldWidgetConstraintValidatorTest.php
index 50d173b..1982953 100644
--- a/core/tests/Drupal/KernelTests/Core/Entity/FieldWidgetConstraintValidatorTest.php
+++ b/core/tests/Drupal/KernelTests/Core/Entity/FieldWidgetConstraintValidatorTest.php
@@ -15,7 +15,7 @@
  */
 class FieldWidgetConstraintValidatorTest extends KernelTestBase {
 
-  public static $modules = array('entity_test', 'field', 'user', 'system');
+  protected static $modules = array('entity_test', 'field', 'user', 'system');
 
   /**
    * {@inheritdoc}
diff --git a/core/tests/Drupal/KernelTests/Core/Entity/RevisionableContentEntityBaseTest.php b/core/tests/Drupal/KernelTests/Core/Entity/RevisionableContentEntityBaseTest.php
index 1fd873c..e727eb6 100644
--- a/core/tests/Drupal/KernelTests/Core/Entity/RevisionableContentEntityBaseTest.php
+++ b/core/tests/Drupal/KernelTests/Core/Entity/RevisionableContentEntityBaseTest.php
@@ -15,7 +15,7 @@ class RevisionableContentEntityBaseTest extends KernelTestBase {
   /**
    * {@inheritdoc}
    */
-  public static $modules = ['entity_test', 'system', 'user'];
+  protected static $modules = ['entity_test', 'system', 'user'];
 
   /**
    * {@inheritdoc}
diff --git a/core/tests/Drupal/KernelTests/Core/Entity/RouteProviderTest.php b/core/tests/Drupal/KernelTests/Core/Entity/RouteProviderTest.php
index df9f4b1..321ec3b 100644
--- a/core/tests/Drupal/KernelTests/Core/Entity/RouteProviderTest.php
+++ b/core/tests/Drupal/KernelTests/Core/Entity/RouteProviderTest.php
@@ -20,7 +20,7 @@ class RouteProviderTest extends KernelTestBase {
   /**
    * {@inheritdoc}
    */
-  public static $modules = ['entity_test', 'user', 'system'];
+  protected static $modules = ['entity_test', 'user', 'system'];
 
   /**
    * {@inheritdoc}
diff --git a/core/tests/Drupal/KernelTests/Core/Entity/ValidReferenceConstraintValidatorTest.php b/core/tests/Drupal/KernelTests/Core/Entity/ValidReferenceConstraintValidatorTest.php
index 64bb933..8737217 100644
--- a/core/tests/Drupal/KernelTests/Core/Entity/ValidReferenceConstraintValidatorTest.php
+++ b/core/tests/Drupal/KernelTests/Core/Entity/ValidReferenceConstraintValidatorTest.php
@@ -21,7 +21,7 @@ class ValidReferenceConstraintValidatorTest extends EntityKernelTestBase {
   /**
    * {@inheritdoc}
    */
-  public static $modules = array('field', 'user');
+  protected static $modules = array('field', 'user');
 
   /**
    * {@inheritdoc}
diff --git a/core/tests/Drupal/KernelTests/Core/Extension/ModuleImplementsAlterTest.php b/core/tests/Drupal/KernelTests/Core/Extension/ModuleImplementsAlterTest.php
index f55d744..b51970a 100644
--- a/core/tests/Drupal/KernelTests/Core/Extension/ModuleImplementsAlterTest.php
+++ b/core/tests/Drupal/KernelTests/Core/Extension/ModuleImplementsAlterTest.php
@@ -14,7 +14,7 @@ class ModuleImplementsAlterTest extends KernelTestBase {
   /**
    * {@inheritdoc}
    */
-  public static $modules = ['system'];
+  protected static $modules = ['system'];
 
   /**
    * Tests hook_module_implements_alter() adding an implementation.
diff --git a/core/tests/Drupal/KernelTests/Core/Extension/ModuleInstallerTest.php b/core/tests/Drupal/KernelTests/Core/Extension/ModuleInstallerTest.php
index c15e7fb..5768d1c 100644
--- a/core/tests/Drupal/KernelTests/Core/Extension/ModuleInstallerTest.php
+++ b/core/tests/Drupal/KernelTests/Core/Extension/ModuleInstallerTest.php
@@ -22,7 +22,7 @@ class ModuleInstallerTest extends KernelTestBase {
    *
    * @var array
    */
-  public static $modules = ['system'];
+  protected static $modules = ['system'];
 
   /**
    * Tests that routes are rebuilt during install and uninstall of modules.
diff --git a/core/tests/Drupal/KernelTests/Core/Field/FieldAccessTest.php b/core/tests/Drupal/KernelTests/Core/Field/FieldAccessTest.php
index 5a59a23..187320d 100644
--- a/core/tests/Drupal/KernelTests/Core/Field/FieldAccessTest.php
+++ b/core/tests/Drupal/KernelTests/Core/Field/FieldAccessTest.php
@@ -19,7 +19,7 @@ class FieldAccessTest extends KernelTestBase {
    *
    * @var array
    */
-  public static $modules = ['entity_test', 'field', 'system', 'text', 'filter', 'user'];
+  protected static $modules = ['entity_test', 'field', 'system', 'text', 'filter', 'user'];
 
   /**
    * Holds the currently active global user ID that initiated the test run.
diff --git a/core/tests/Drupal/KernelTests/Core/Field/FieldSettingsTest.php b/core/tests/Drupal/KernelTests/Core/Field/FieldSettingsTest.php
index a55888f..f7ae231 100644
--- a/core/tests/Drupal/KernelTests/Core/Field/FieldSettingsTest.php
+++ b/core/tests/Drupal/KernelTests/Core/Field/FieldSettingsTest.php
@@ -19,7 +19,7 @@ class FieldSettingsTest extends EntityKernelTestBase {
    *
    * @var array
    */
-  public static $modules = array('field', 'field_test');
+  protected static $modules = array('field', 'field_test');
 
   /**
    * @covers \Drupal\Core\Field\BaseFieldDefinition::getSettings
diff --git a/core/tests/Drupal/KernelTests/Core/File/FileTestBase.php b/core/tests/Drupal/KernelTests/Core/File/FileTestBase.php
index 548d1bc..a211eea 100644
--- a/core/tests/Drupal/KernelTests/Core/File/FileTestBase.php
+++ b/core/tests/Drupal/KernelTests/Core/File/FileTestBase.php
@@ -16,7 +16,7 @@
    *
    * @var array
    */
-  public static $modules = array('system');
+  protected static $modules = array('system');
 
   /**
    * A stream wrapper scheme to register for the test.
diff --git a/core/tests/Drupal/KernelTests/Core/File/MimeTypeTest.php b/core/tests/Drupal/KernelTests/Core/File/MimeTypeTest.php
index 9bfe681..0849533 100644
--- a/core/tests/Drupal/KernelTests/Core/File/MimeTypeTest.php
+++ b/core/tests/Drupal/KernelTests/Core/File/MimeTypeTest.php
@@ -14,7 +14,7 @@ class MimeTypeTest extends FileTestBase {
    *
    * @var array
    */
-  public static $modules = array('file_test');
+  protected static $modules = array('file_test');
 
   /**
    * Test mapping of mimetypes from filenames.
diff --git a/core/tests/Drupal/KernelTests/Core/File/RemoteFileDirectoryTest.php b/core/tests/Drupal/KernelTests/Core/File/RemoteFileDirectoryTest.php
index 3265562..b660611 100644
--- a/core/tests/Drupal/KernelTests/Core/File/RemoteFileDirectoryTest.php
+++ b/core/tests/Drupal/KernelTests/Core/File/RemoteFileDirectoryTest.php
@@ -14,7 +14,7 @@ class RemoteFileDirectoryTest extends DirectoryTest {
    *
    * @var array
    */
-  public static $modules = array('file_test');
+  protected static $modules = array('file_test');
 
   /**
    * A stream wrapper scheme to register for the test.
diff --git a/core/tests/Drupal/KernelTests/Core/File/RemoteFileScanDirectoryTest.php b/core/tests/Drupal/KernelTests/Core/File/RemoteFileScanDirectoryTest.php
index 3d872bc..7a12a80 100644
--- a/core/tests/Drupal/KernelTests/Core/File/RemoteFileScanDirectoryTest.php
+++ b/core/tests/Drupal/KernelTests/Core/File/RemoteFileScanDirectoryTest.php
@@ -14,7 +14,7 @@ class RemoteFileScanDirectoryTest extends ScanDirectoryTest {
    *
    * @var array
    */
-  public static $modules = array('file_test');
+  protected static $modules = array('file_test');
 
   /**
    * A stream wrapper scheme to register for the test.
diff --git a/core/tests/Drupal/KernelTests/Core/File/RemoteFileUnmanagedCopyTest.php b/core/tests/Drupal/KernelTests/Core/File/RemoteFileUnmanagedCopyTest.php
index 8be6726..2bc1b66 100644
--- a/core/tests/Drupal/KernelTests/Core/File/RemoteFileUnmanagedCopyTest.php
+++ b/core/tests/Drupal/KernelTests/Core/File/RemoteFileUnmanagedCopyTest.php
@@ -14,7 +14,7 @@ class RemoteFileUnmanagedCopyTest extends UnmanagedCopyTest {
    *
    * @var array
    */
-  public static $modules = array('file_test');
+  protected static $modules = array('file_test');
 
   /**
    * A stream wrapper scheme to register for the test.
diff --git a/core/tests/Drupal/KernelTests/Core/File/RemoteFileUnmanagedDeleteRecursiveTest.php b/core/tests/Drupal/KernelTests/Core/File/RemoteFileUnmanagedDeleteRecursiveTest.php
index 06f0e1a..53744e7 100644
--- a/core/tests/Drupal/KernelTests/Core/File/RemoteFileUnmanagedDeleteRecursiveTest.php
+++ b/core/tests/Drupal/KernelTests/Core/File/RemoteFileUnmanagedDeleteRecursiveTest.php
@@ -14,7 +14,7 @@ class RemoteFileUnmanagedDeleteRecursiveTest extends UnmanagedDeleteRecursiveTes
    *
    * @var array
    */
-  public static $modules = array('file_test');
+  protected static $modules = array('file_test');
 
   /**
    * A stream wrapper scheme to register for the test.
diff --git a/core/tests/Drupal/KernelTests/Core/File/RemoteFileUnmanagedDeleteTest.php b/core/tests/Drupal/KernelTests/Core/File/RemoteFileUnmanagedDeleteTest.php
index fe0ad6e..cebc15d 100644
--- a/core/tests/Drupal/KernelTests/Core/File/RemoteFileUnmanagedDeleteTest.php
+++ b/core/tests/Drupal/KernelTests/Core/File/RemoteFileUnmanagedDeleteTest.php
@@ -14,7 +14,7 @@ class RemoteFileUnmanagedDeleteTest extends UnmanagedDeleteTest {
    *
    * @var array
    */
-  public static $modules = array('file_test');
+  protected static $modules = array('file_test');
 
   /**
    * A stream wrapper scheme to register for the test.
diff --git a/core/tests/Drupal/KernelTests/Core/File/RemoteFileUnmanagedMoveTest.php b/core/tests/Drupal/KernelTests/Core/File/RemoteFileUnmanagedMoveTest.php
index 47b66f2..8d7f0e7 100644
--- a/core/tests/Drupal/KernelTests/Core/File/RemoteFileUnmanagedMoveTest.php
+++ b/core/tests/Drupal/KernelTests/Core/File/RemoteFileUnmanagedMoveTest.php
@@ -14,7 +14,7 @@ class RemoteFileUnmanagedMoveTest extends UnmanagedMoveTest {
    *
    * @var array
    */
-  public static $modules = array('file_test');
+  protected static $modules = array('file_test');
 
   /**
    * A stream wrapper scheme to register for the test.
diff --git a/core/tests/Drupal/KernelTests/Core/File/RemoteFileUnmanagedSaveDataTest.php b/core/tests/Drupal/KernelTests/Core/File/RemoteFileUnmanagedSaveDataTest.php
index 15b5929..dc36c51 100644
--- a/core/tests/Drupal/KernelTests/Core/File/RemoteFileUnmanagedSaveDataTest.php
+++ b/core/tests/Drupal/KernelTests/Core/File/RemoteFileUnmanagedSaveDataTest.php
@@ -14,7 +14,7 @@ class RemoteFileUnmanagedSaveDataTest extends UnmanagedSaveDataTest {
    *
    * @var array
    */
-  public static $modules = array('file_test');
+  protected static $modules = array('file_test');
 
   /**
    * A stream wrapper scheme to register for the test.
diff --git a/core/tests/Drupal/KernelTests/Core/File/ScanDirectoryTest.php b/core/tests/Drupal/KernelTests/Core/File/ScanDirectoryTest.php
index 8362c04..bb6f3c2 100644
--- a/core/tests/Drupal/KernelTests/Core/File/ScanDirectoryTest.php
+++ b/core/tests/Drupal/KernelTests/Core/File/ScanDirectoryTest.php
@@ -14,7 +14,7 @@ class ScanDirectoryTest extends FileTestBase {
    *
    * @var array
    */
-  public static $modules = array('file_test');
+  protected static $modules = array('file_test');
 
   /**
    * @var string
diff --git a/core/tests/Drupal/KernelTests/Core/File/StreamWrapperTest.php b/core/tests/Drupal/KernelTests/Core/File/StreamWrapperTest.php
index e9c8642..1d4b85d 100644
--- a/core/tests/Drupal/KernelTests/Core/File/StreamWrapperTest.php
+++ b/core/tests/Drupal/KernelTests/Core/File/StreamWrapperTest.php
@@ -19,7 +19,7 @@ class StreamWrapperTest extends FileTestBase {
    *
    * @var array
    */
-  public static $modules = array('file_test');
+  protected static $modules = array('file_test');
 
   /**
    * A stream wrapper scheme to register for the test.
diff --git a/core/tests/Drupal/KernelTests/Core/File/UrlRewritingTest.php b/core/tests/Drupal/KernelTests/Core/File/UrlRewritingTest.php
index 5494975..4ef7c3a 100644
--- a/core/tests/Drupal/KernelTests/Core/File/UrlRewritingTest.php
+++ b/core/tests/Drupal/KernelTests/Core/File/UrlRewritingTest.php
@@ -16,7 +16,7 @@ class UrlRewritingTest extends FileTestBase {
    *
    * @var array
    */
-  public static $modules = array('file_test');
+  protected static $modules = array('file_test');
 
   /**
    * Tests the rewriting of shipped file URLs by hook_file_url_alter().
diff --git a/core/tests/Drupal/KernelTests/Core/Form/ExternalFormUrlTest.php b/core/tests/Drupal/KernelTests/Core/Form/ExternalFormUrlTest.php
index f3fbc4f..b0c8006 100644
--- a/core/tests/Drupal/KernelTests/Core/Form/ExternalFormUrlTest.php
+++ b/core/tests/Drupal/KernelTests/Core/Form/ExternalFormUrlTest.php
@@ -18,7 +18,7 @@ class ExternalFormUrlTest extends KernelTestBase implements FormInterface {
   /**
    * {@inheritdoc}
    */
-  public static $modules = ['user', 'system'];
+  protected static $modules = ['user', 'system'];
 
   /**
    * {@inheritdoc}
diff --git a/core/tests/Drupal/KernelTests/Core/Form/FormCacheTest.php b/core/tests/Drupal/KernelTests/Core/Form/FormCacheTest.php
index fa86bee..f46ecd0 100644
--- a/core/tests/Drupal/KernelTests/Core/Form/FormCacheTest.php
+++ b/core/tests/Drupal/KernelTests/Core/Form/FormCacheTest.php
@@ -20,7 +20,7 @@ class FormCacheTest extends KernelTestBase {
    *
    * @var array
    */
-  public static $modules = array('system', 'user');
+  protected static $modules = array('system', 'user');
 
   /**
    * @var string
diff --git a/core/tests/Drupal/KernelTests/Core/Form/FormDefaultHandlersTest.php b/core/tests/Drupal/KernelTests/Core/Form/FormDefaultHandlersTest.php
index 7f046e9..4f359cf 100644
--- a/core/tests/Drupal/KernelTests/Core/Form/FormDefaultHandlersTest.php
+++ b/core/tests/Drupal/KernelTests/Core/Form/FormDefaultHandlersTest.php
@@ -19,7 +19,7 @@ class FormDefaultHandlersTest extends KernelTestBase implements FormInterface {
    *
    * @var array
    */
-  public static $modules = array('system');
+  protected static $modules = array('system');
 
   /**
    * {@inheritdoc}
diff --git a/core/tests/Drupal/KernelTests/Core/HttpKernel/CorsIntegrationTest.php b/core/tests/Drupal/KernelTests/Core/HttpKernel/CorsIntegrationTest.php
index e73efa3..4162144 100644
--- a/core/tests/Drupal/KernelTests/Core/HttpKernel/CorsIntegrationTest.php
+++ b/core/tests/Drupal/KernelTests/Core/HttpKernel/CorsIntegrationTest.php
@@ -29,7 +29,7 @@ class CorsIntegrationTest extends KernelTestBase implements ServiceModifierInter
   /**
    * {@inheritdoc}
    */
-  public static $modules = ['system', 'test_page_test'];
+  protected static $modules = ['system', 'test_page_test'];
 
   protected function setUp() {
     parent::setUp();
diff --git a/core/tests/Drupal/KernelTests/Core/HttpKernel/StackKernelIntegrationTest.php b/core/tests/Drupal/KernelTests/Core/HttpKernel/StackKernelIntegrationTest.php
index 166ec24..ad067c6 100644
--- a/core/tests/Drupal/KernelTests/Core/HttpKernel/StackKernelIntegrationTest.php
+++ b/core/tests/Drupal/KernelTests/Core/HttpKernel/StackKernelIntegrationTest.php
@@ -19,7 +19,7 @@ class StackKernelIntegrationTest extends KernelTestBase {
    *
    * @var array
    */
-  public static $modules = array('httpkernel_test', 'system');
+  protected static $modules = array('httpkernel_test', 'system');
 
   /**
    * {@inheritdoc}
diff --git a/core/tests/Drupal/KernelTests/Core/Image/ToolkitGdTest.php b/core/tests/Drupal/KernelTests/Core/Image/ToolkitGdTest.php
index fe36c3d..1917152 100644
--- a/core/tests/Drupal/KernelTests/Core/Image/ToolkitGdTest.php
+++ b/core/tests/Drupal/KernelTests/Core/Image/ToolkitGdTest.php
@@ -42,7 +42,7 @@ class ToolkitGdTest extends KernelTestBase {
    *
    * @var array
    */
-  public static $modules = array('system', 'simpletest');
+  protected static $modules = array('system', 'simpletest');
 
   /**
    * {@inheritdoc}
diff --git a/core/tests/Drupal/KernelTests/Core/KeyValueStore/DatabaseStorageExpirableTest.php b/core/tests/Drupal/KernelTests/Core/KeyValueStore/DatabaseStorageExpirableTest.php
index 1631501..f3f7eeb 100644
--- a/core/tests/Drupal/KernelTests/Core/KeyValueStore/DatabaseStorageExpirableTest.php
+++ b/core/tests/Drupal/KernelTests/Core/KeyValueStore/DatabaseStorageExpirableTest.php
@@ -17,7 +17,7 @@ class DatabaseStorageExpirableTest extends StorageTestBase {
    *
    * @var array
    */
-  public static $modules = array('system');
+  protected static $modules = array('system');
 
   protected function setUp() {
     parent::setUp();
diff --git a/core/tests/Drupal/KernelTests/Core/KeyValueStore/DatabaseStorageTest.php b/core/tests/Drupal/KernelTests/Core/KeyValueStore/DatabaseStorageTest.php
index 676ab10..c794378 100644
--- a/core/tests/Drupal/KernelTests/Core/KeyValueStore/DatabaseStorageTest.php
+++ b/core/tests/Drupal/KernelTests/Core/KeyValueStore/DatabaseStorageTest.php
@@ -17,7 +17,7 @@ class DatabaseStorageTest extends StorageTestBase {
    *
    * @var array
    */
-  public static $modules = array('system');
+  protected static $modules = array('system');
 
   protected function setUp() {
     parent::setUp();
diff --git a/core/tests/Drupal/KernelTests/Core/KeyValueStore/GarbageCollectionTest.php b/core/tests/Drupal/KernelTests/Core/KeyValueStore/GarbageCollectionTest.php
index 4dc9b47..7b830ff 100644
--- a/core/tests/Drupal/KernelTests/Core/KeyValueStore/GarbageCollectionTest.php
+++ b/core/tests/Drupal/KernelTests/Core/KeyValueStore/GarbageCollectionTest.php
@@ -19,7 +19,7 @@ class GarbageCollectionTest extends KernelTestBase {
    *
    * @var array
    */
-  public static $modules = array('system');
+  protected static $modules = array('system');
 
   protected function setUp() {
     parent::setUp();
diff --git a/core/tests/Drupal/KernelTests/Core/KeyValueStore/KeyValueContentEntityStorageTest.php b/core/tests/Drupal/KernelTests/Core/KeyValueStore/KeyValueContentEntityStorageTest.php
index 068216b..23d2554 100644
--- a/core/tests/Drupal/KernelTests/Core/KeyValueStore/KeyValueContentEntityStorageTest.php
+++ b/core/tests/Drupal/KernelTests/Core/KeyValueStore/KeyValueContentEntityStorageTest.php
@@ -19,7 +19,7 @@ class KeyValueContentEntityStorageTest extends KernelTestBase {
    *
    * @var array
    */
-  public static $modules = array('user', 'entity_test', 'keyvalue_test');
+  protected static $modules = array('user', 'entity_test', 'keyvalue_test');
 
   /**
    * {@inheritdoc}
diff --git a/core/tests/Drupal/KernelTests/Core/Menu/MenuLinkDefaultIntegrationTest.php b/core/tests/Drupal/KernelTests/Core/Menu/MenuLinkDefaultIntegrationTest.php
index b999887..a1d7f6d 100644
--- a/core/tests/Drupal/KernelTests/Core/Menu/MenuLinkDefaultIntegrationTest.php
+++ b/core/tests/Drupal/KernelTests/Core/Menu/MenuLinkDefaultIntegrationTest.php
@@ -17,7 +17,7 @@ class MenuLinkDefaultIntegrationTest extends KernelTestBase {
    *
    * @var array
    */
-  public static $modules = array(
+  protected static $modules = array(
     'menu_test',
   );
 
diff --git a/core/tests/Drupal/KernelTests/Core/Menu/MenuLinkTreeTest.php b/core/tests/Drupal/KernelTests/Core/Menu/MenuLinkTreeTest.php
index 1efb14b..de01898 100644
--- a/core/tests/Drupal/KernelTests/Core/Menu/MenuLinkTreeTest.php
+++ b/core/tests/Drupal/KernelTests/Core/Menu/MenuLinkTreeTest.php
@@ -35,7 +35,7 @@ class MenuLinkTreeTest extends KernelTestBase {
    *
    * @var array
    */
-  public static $modules = array(
+  protected static $modules = array(
     'system',
     'menu_test',
     'menu_link_content',
diff --git a/core/tests/Drupal/KernelTests/Core/Path/AliasStorageTest.php b/core/tests/Drupal/KernelTests/Core/Path/AliasStorageTest.php
index d7b24b4..e9967f5 100644
--- a/core/tests/Drupal/KernelTests/Core/Path/AliasStorageTest.php
+++ b/core/tests/Drupal/KernelTests/Core/Path/AliasStorageTest.php
@@ -14,7 +14,7 @@ class AliasStorageTest extends KernelTestBase {
   /**
    * {@inheritdoc}
    */
-  public static $modules = ['system'];
+  protected static $modules = ['system'];
 
   /**
    * @var \Drupal\Core\Path\AliasStorage
diff --git a/core/tests/Drupal/KernelTests/Core/Path/UrlAlterTest.php b/core/tests/Drupal/KernelTests/Core/Path/UrlAlterTest.php
index 37ac65a..ae5f631 100644
--- a/core/tests/Drupal/KernelTests/Core/Path/UrlAlterTest.php
+++ b/core/tests/Drupal/KernelTests/Core/Path/UrlAlterTest.php
@@ -17,7 +17,7 @@ class UrlAlterTest extends KernelTestBase {
   /**
    * {@inheritdoc}
    */
-  public static $modules = ['path', 'url_alter_test', 'user'];
+  protected static $modules = ['path', 'url_alter_test', 'user'];
 
   public function testUrlWithQueryString() {
     // Test outbound query string altering.
diff --git a/core/tests/Drupal/KernelTests/Core/Plugin/Condition/ConditionTestDualUserTest.php b/core/tests/Drupal/KernelTests/Core/Plugin/Condition/ConditionTestDualUserTest.php
index 5d57d57..6769268 100644
--- a/core/tests/Drupal/KernelTests/Core/Plugin/Condition/ConditionTestDualUserTest.php
+++ b/core/tests/Drupal/KernelTests/Core/Plugin/Condition/ConditionTestDualUserTest.php
@@ -31,7 +31,7 @@ class ConditionTestDualUserTest extends KernelTestBase {
   /**
    * {@inheritdoc}
    */
-  public static $modules = ['system', 'user', 'condition_test'];
+  protected static $modules = ['system', 'user', 'condition_test'];
 
   /**
    * {@inheritdoc}
diff --git a/core/tests/Drupal/KernelTests/Core/Plugin/Condition/CurrentThemeConditionTest.php b/core/tests/Drupal/KernelTests/Core/Plugin/Condition/CurrentThemeConditionTest.php
index f152319..4daed7f 100644
--- a/core/tests/Drupal/KernelTests/Core/Plugin/Condition/CurrentThemeConditionTest.php
+++ b/core/tests/Drupal/KernelTests/Core/Plugin/Condition/CurrentThemeConditionTest.php
@@ -15,7 +15,7 @@ class CurrentThemeConditionTest extends KernelTestBase {
   /**
    * {@inheritdoc}
    */
-  public static $modules = array('system', 'theme_test');
+  protected static $modules = array('system', 'theme_test');
 
   /**
    * Tests the current theme condition.
diff --git a/core/tests/Drupal/KernelTests/Core/Plugin/Condition/OptionalContextConditionTest.php b/core/tests/Drupal/KernelTests/Core/Plugin/Condition/OptionalContextConditionTest.php
index 96c8bac..f1ca081 100644
--- a/core/tests/Drupal/KernelTests/Core/Plugin/Condition/OptionalContextConditionTest.php
+++ b/core/tests/Drupal/KernelTests/Core/Plugin/Condition/OptionalContextConditionTest.php
@@ -18,7 +18,7 @@ class OptionalContextConditionTest extends KernelTestBase {
   /**
    * {@inheritdoc}
    */
-  public static $modules = ['system', 'user', 'condition_test', 'node'];
+  protected static $modules = ['system', 'user', 'condition_test', 'node'];
 
   /**
    * Tests with both contexts mapped to the same user.
diff --git a/core/tests/Drupal/KernelTests/Core/Plugin/Condition/RequestPathTest.php b/core/tests/Drupal/KernelTests/Core/Plugin/Condition/RequestPathTest.php
index 02f2a5d..0421a7d 100644
--- a/core/tests/Drupal/KernelTests/Core/Plugin/Condition/RequestPathTest.php
+++ b/core/tests/Drupal/KernelTests/Core/Plugin/Condition/RequestPathTest.php
@@ -42,7 +42,7 @@ class RequestPathTest extends KernelTestBase {
    *
    * @var array
    */
-  public static $modules = array('system', 'user', 'field', 'path');
+  protected static $modules = array('system', 'user', 'field', 'path');
 
   /**
    * The current path.
diff --git a/core/tests/Drupal/KernelTests/Core/Plugin/ContextPluginTest.php b/core/tests/Drupal/KernelTests/Core/Plugin/ContextPluginTest.php
index 3c25184..7674895 100644
--- a/core/tests/Drupal/KernelTests/Core/Plugin/ContextPluginTest.php
+++ b/core/tests/Drupal/KernelTests/Core/Plugin/ContextPluginTest.php
@@ -17,7 +17,7 @@
  */
 class ContextPluginTest extends KernelTestBase {
 
-  public static $modules = array('system', 'user', 'node', 'field', 'filter', 'text');
+  protected static $modules = array('system', 'user', 'node', 'field', 'filter', 'text');
 
   /**
    * Tests basic context definition and value getters and setters.
diff --git a/core/tests/Drupal/KernelTests/Core/Plugin/PluginTestBase.php b/core/tests/Drupal/KernelTests/Core/Plugin/PluginTestBase.php
index 3d651b1..75fdf7e 100644
--- a/core/tests/Drupal/KernelTests/Core/Plugin/PluginTestBase.php
+++ b/core/tests/Drupal/KernelTests/Core/Plugin/PluginTestBase.php
@@ -20,7 +20,7 @@
    *
    * @var array
    */
-  public static $modules = array('plugin_test');
+  protected static $modules = array('plugin_test');
 
   protected $testPluginManager;
   protected $testPluginExpectedDefinitions;
diff --git a/core/tests/Drupal/KernelTests/Core/Queue/QueueSerializationTest.php b/core/tests/Drupal/KernelTests/Core/Queue/QueueSerializationTest.php
index 3ea4c66..26405d1 100644
--- a/core/tests/Drupal/KernelTests/Core/Queue/QueueSerializationTest.php
+++ b/core/tests/Drupal/KernelTests/Core/Queue/QueueSerializationTest.php
@@ -30,7 +30,7 @@ class QueueSerializationTest extends KernelTestBase implements FormInterface {
    *
    * @var array
    */
-  public static $modules = array('system', 'user', 'aggregator');
+  protected static $modules = array('system', 'user', 'aggregator');
 
   /**
    * {@inheritdoc}
diff --git a/core/tests/Drupal/KernelTests/Core/Render/Element/RenderElementTypesTest.php b/core/tests/Drupal/KernelTests/Core/Render/Element/RenderElementTypesTest.php
index 3e11695..6bf632d 100644
--- a/core/tests/Drupal/KernelTests/Core/Render/Element/RenderElementTypesTest.php
+++ b/core/tests/Drupal/KernelTests/Core/Render/Element/RenderElementTypesTest.php
@@ -18,7 +18,7 @@ class RenderElementTypesTest extends KernelTestBase {
    *
    * @var array
    */
-  public static $modules = array('system', 'router_test');
+  protected static $modules = array('system', 'router_test');
 
   protected function setUp() {
     parent::setUp();
diff --git a/core/tests/Drupal/KernelTests/Core/Render/Element/TableTest.php b/core/tests/Drupal/KernelTests/Core/Render/Element/TableTest.php
index 0f9e5b6..cb53e78 100644
--- a/core/tests/Drupal/KernelTests/Core/Render/Element/TableTest.php
+++ b/core/tests/Drupal/KernelTests/Core/Render/Element/TableTest.php
@@ -16,7 +16,7 @@ class TableTest extends KernelTestBase {
    *
    * @var array
    */
-  public static $modules = ['system', 'form_test'];
+  protected static $modules = ['system', 'form_test'];
 
   /**
    * Tableheader.js provides 'sticky' table headers, and is included by default.
diff --git a/core/tests/Drupal/KernelTests/Core/Render/RenderCacheTest.php b/core/tests/Drupal/KernelTests/Core/Render/RenderCacheTest.php
index 91061ca..1d98ff4 100644
--- a/core/tests/Drupal/KernelTests/Core/Render/RenderCacheTest.php
+++ b/core/tests/Drupal/KernelTests/Core/Render/RenderCacheTest.php
@@ -19,7 +19,7 @@ class RenderCacheTest extends KernelTestBase {
    *
    * @var array
    */
-  public static $modules = ['user', 'system'];
+  protected static $modules = ['user', 'system'];
 
   /**
    * {@inheritdoc}
diff --git a/core/tests/Drupal/KernelTests/Core/Render/RenderTest.php b/core/tests/Drupal/KernelTests/Core/Render/RenderTest.php
index 8860c19..11e6c6b 100644
--- a/core/tests/Drupal/KernelTests/Core/Render/RenderTest.php
+++ b/core/tests/Drupal/KernelTests/Core/Render/RenderTest.php
@@ -16,7 +16,7 @@ class RenderTest extends KernelTestBase {
    *
    * @var array
    */
-  public static $modules = array('system', 'common_test');
+  protected static $modules = array('system', 'common_test');
 
   /**
    * Tests theme preprocess functions being able to attach assets.
diff --git a/core/tests/Drupal/KernelTests/Core/RouteProcessor/RouteNoneTest.php b/core/tests/Drupal/KernelTests/Core/RouteProcessor/RouteNoneTest.php
index 2b59933..d1fd158 100644
--- a/core/tests/Drupal/KernelTests/Core/RouteProcessor/RouteNoneTest.php
+++ b/core/tests/Drupal/KernelTests/Core/RouteProcessor/RouteNoneTest.php
@@ -22,7 +22,7 @@ class RouteNoneTest extends KernelTestBase {
   /**
    * {@inheritdoc}
    */
-  public static $modules = ['system'];
+  protected static $modules = ['system'];
 
   /**
    * The URL generator.
diff --git a/core/tests/Drupal/KernelTests/Core/RouteProcessor/RouteProcessorCurrentIntegrationTest.php b/core/tests/Drupal/KernelTests/Core/RouteProcessor/RouteProcessorCurrentIntegrationTest.php
index ea6a9c2..0a67f85 100644
--- a/core/tests/Drupal/KernelTests/Core/RouteProcessor/RouteProcessorCurrentIntegrationTest.php
+++ b/core/tests/Drupal/KernelTests/Core/RouteProcessor/RouteProcessorCurrentIntegrationTest.php
@@ -21,7 +21,7 @@ class RouteProcessorCurrentIntegrationTest extends KernelTestBase {
   /**
    * {@inheritdoc}
    */
-  public static $modules = ['system'];
+  protected static $modules = ['system'];
 
   /**
    * The URL generator.
diff --git a/core/tests/Drupal/KernelTests/Core/Routing/ContentNegotiationRoutingTest.php b/core/tests/Drupal/KernelTests/Core/Routing/ContentNegotiationRoutingTest.php
index 812e437..c22ab79 100644
--- a/core/tests/Drupal/KernelTests/Core/Routing/ContentNegotiationRoutingTest.php
+++ b/core/tests/Drupal/KernelTests/Core/Routing/ContentNegotiationRoutingTest.php
@@ -17,7 +17,7 @@ class ContentNegotiationRoutingTest extends KernelTestBase {
   /**
    * {@inheritdoc}
    */
-  public static $modules = ['conneg_test'];
+  protected static $modules = ['conneg_test'];
 
   /**
    * {@inheritdoc}
diff --git a/core/tests/Drupal/KernelTests/Core/Routing/ExceptionHandlingTest.php b/core/tests/Drupal/KernelTests/Core/Routing/ExceptionHandlingTest.php
index 8564948..feda56c 100644
--- a/core/tests/Drupal/KernelTests/Core/Routing/ExceptionHandlingTest.php
+++ b/core/tests/Drupal/KernelTests/Core/Routing/ExceptionHandlingTest.php
@@ -17,7 +17,7 @@ class ExceptionHandlingTest extends KernelTestBase {
   /**
    * {@inheritdoc}
    */
-  public static $modules = ['system', 'router_test'];
+  protected static $modules = ['system', 'router_test'];
 
   /**
    * {@inheritdoc}
diff --git a/core/tests/Drupal/KernelTests/Core/Routing/RouteProviderTest.php b/core/tests/Drupal/KernelTests/Core/Routing/RouteProviderTest.php
index 710d82f..e4e385a 100644
--- a/core/tests/Drupal/KernelTests/Core/Routing/RouteProviderTest.php
+++ b/core/tests/Drupal/KernelTests/Core/Routing/RouteProviderTest.php
@@ -34,7 +34,7 @@ class RouteProviderTest extends KernelTestBase {
   /**
    * Modules to enable.
    */
-  public static $modules = ['url_alter_test', 'system'];
+  protected static $modules = ['url_alter_test', 'system'];
 
   /**
    * A collection of shared fixture data for tests.
diff --git a/core/tests/Drupal/KernelTests/Core/Routing/UrlIntegrationTest.php b/core/tests/Drupal/KernelTests/Core/Routing/UrlIntegrationTest.php
index a70cc1f..9973e49 100644
--- a/core/tests/Drupal/KernelTests/Core/Routing/UrlIntegrationTest.php
+++ b/core/tests/Drupal/KernelTests/Core/Routing/UrlIntegrationTest.php
@@ -19,7 +19,7 @@ class UrlIntegrationTest extends KernelTestBase {
    *
    * @var array
    */
-  public static $modules = array('user', 'router_test', 'system');
+  protected static $modules = array('user', 'router_test', 'system');
 
   /**
    * Ensures that the access() method on \Drupal\Core\Url objects works.
diff --git a/core/tests/Drupal/KernelTests/Core/ServiceProvider/ServiceProviderTest.php b/core/tests/Drupal/KernelTests/Core/ServiceProvider/ServiceProviderTest.php
index 2995c97..f395e60 100644
--- a/core/tests/Drupal/KernelTests/Core/ServiceProvider/ServiceProviderTest.php
+++ b/core/tests/Drupal/KernelTests/Core/ServiceProvider/ServiceProviderTest.php
@@ -16,7 +16,7 @@ class ServiceProviderTest extends KernelTestBase {
    *
    * @var array
    */
-  public static $modules = array('file', 'service_provider_test', 'system');
+  protected static $modules = array('file', 'service_provider_test', 'system');
 
   /**
    * Tests that services provided by module service providers get registered to the DIC.
diff --git a/core/tests/Drupal/KernelTests/Core/StringTranslation/TranslationStringTest.php b/core/tests/Drupal/KernelTests/Core/StringTranslation/TranslationStringTest.php
index 748e2bb..da7a2bf 100644
--- a/core/tests/Drupal/KernelTests/Core/StringTranslation/TranslationStringTest.php
+++ b/core/tests/Drupal/KernelTests/Core/StringTranslation/TranslationStringTest.php
@@ -18,7 +18,7 @@ class TranslationStringTest extends KernelTestBase {
    *
    * @var array
    */
-  public static $modules = [
+  protected static $modules = [
     'language'
   ];
 
diff --git a/core/tests/Drupal/KernelTests/Core/Theme/ImageTest.php b/core/tests/Drupal/KernelTests/Core/Theme/ImageTest.php
index 51608eb..44c0e28 100644
--- a/core/tests/Drupal/KernelTests/Core/Theme/ImageTest.php
+++ b/core/tests/Drupal/KernelTests/Core/Theme/ImageTest.php
@@ -17,7 +17,7 @@ class ImageTest extends KernelTestBase {
    *
    * @var array
    */
-  public static $modules = array('system');
+  protected static $modules = array('system');
 
   /*
    * The images to test with.
diff --git a/core/tests/Drupal/KernelTests/Core/Theme/MessageTest.php b/core/tests/Drupal/KernelTests/Core/Theme/MessageTest.php
index a9d6150..d2dee54 100644
--- a/core/tests/Drupal/KernelTests/Core/Theme/MessageTest.php
+++ b/core/tests/Drupal/KernelTests/Core/Theme/MessageTest.php
@@ -14,7 +14,7 @@ class MessageTest extends KernelTestBase {
   /**
    * {@inheritdoc}
    */
-  public static $modules = array('system');
+  protected static $modules = array('system');
 
   /**
    * Tests setting messages output.
diff --git a/core/tests/Drupal/KernelTests/Core/Theme/RegistryTest.php b/core/tests/Drupal/KernelTests/Core/Theme/RegistryTest.php
index 97559e5..3d3ac0b 100644
--- a/core/tests/Drupal/KernelTests/Core/Theme/RegistryTest.php
+++ b/core/tests/Drupal/KernelTests/Core/Theme/RegistryTest.php
@@ -20,7 +20,7 @@ class RegistryTest extends KernelTestBase {
    *
    * @var array
    */
-  public static $modules = array('theme_test', 'system');
+  protected static $modules = array('theme_test', 'system');
 
   protected $profile = 'testing';
 
diff --git a/core/tests/Drupal/KernelTests/Core/Theme/StableLibraryOverrideTest.php b/core/tests/Drupal/KernelTests/Core/Theme/StableLibraryOverrideTest.php
index a71c3fe..fafe93b 100644
--- a/core/tests/Drupal/KernelTests/Core/Theme/StableLibraryOverrideTest.php
+++ b/core/tests/Drupal/KernelTests/Core/Theme/StableLibraryOverrideTest.php
@@ -49,7 +49,7 @@ class StableLibraryOverrideTest extends KernelTestBase {
   /**
    * {@inheritdoc}
    */
-  public static $modules = ['system'];
+  protected static $modules = ['system'];
 
   /**
    * {@inheritdoc}
diff --git a/core/tests/Drupal/KernelTests/Core/Theme/StableTemplateOverrideTest.php b/core/tests/Drupal/KernelTests/Core/Theme/StableTemplateOverrideTest.php
index 40d31e6..8089b79 100644
--- a/core/tests/Drupal/KernelTests/Core/Theme/StableTemplateOverrideTest.php
+++ b/core/tests/Drupal/KernelTests/Core/Theme/StableTemplateOverrideTest.php
@@ -15,7 +15,7 @@ class StableTemplateOverrideTest extends KernelTestBase {
   /**
    * {@inheritdoc}
    */
-  public static $modules = ['system', 'user'];
+  protected static $modules = ['system', 'user'];
 
   /**
    * An array of template names to skip, without the extension.
diff --git a/core/tests/Drupal/KernelTests/Core/Theme/StableThemeTest.php b/core/tests/Drupal/KernelTests/Core/Theme/StableThemeTest.php
index 8a79a9e..1d85402 100644
--- a/core/tests/Drupal/KernelTests/Core/Theme/StableThemeTest.php
+++ b/core/tests/Drupal/KernelTests/Core/Theme/StableThemeTest.php
@@ -16,7 +16,7 @@ class StableThemeTest extends KernelTestBase {
    *
    * @var array
    */
-  public static $modules = ['system'];
+  protected static $modules = ['system'];
 
   /**
    * The theme handler.
diff --git a/core/tests/Drupal/KernelTests/Core/Theme/ThemeInstallerTest.php b/core/tests/Drupal/KernelTests/Core/Theme/ThemeInstallerTest.php
index f3e2ade..fce6c03 100644
--- a/core/tests/Drupal/KernelTests/Core/Theme/ThemeInstallerTest.php
+++ b/core/tests/Drupal/KernelTests/Core/Theme/ThemeInstallerTest.php
@@ -18,7 +18,7 @@ class ThemeInstallerTest extends KernelTestBase {
    *
    * @var array
    */
-  public static $modules = array('system');
+  protected static $modules = array('system');
 
   /**
    * {@inheritdoc}
diff --git a/core/tests/Drupal/KernelTests/Core/Theme/ThemeRenderAndAutoescapeTest.php b/core/tests/Drupal/KernelTests/Core/Theme/ThemeRenderAndAutoescapeTest.php
index 98423ca..ae94caa 100644
--- a/core/tests/Drupal/KernelTests/Core/Theme/ThemeRenderAndAutoescapeTest.php
+++ b/core/tests/Drupal/KernelTests/Core/Theme/ThemeRenderAndAutoescapeTest.php
@@ -25,7 +25,7 @@ class ThemeRenderAndAutoescapeTest extends KernelTestBase {
   /**
    * {@inheritdoc}
    */
-  public static $modules = ['system'];
+  protected static $modules = ['system'];
 
   /**
    * {@inheritdoc}
diff --git a/core/tests/Drupal/KernelTests/Core/Theme/ThemeSettingsTest.php b/core/tests/Drupal/KernelTests/Core/Theme/ThemeSettingsTest.php
index 6c2dfb3..44dd81b 100644
--- a/core/tests/Drupal/KernelTests/Core/Theme/ThemeSettingsTest.php
+++ b/core/tests/Drupal/KernelTests/Core/Theme/ThemeSettingsTest.php
@@ -18,7 +18,7 @@ class ThemeSettingsTest extends KernelTestBase {
    *
    * @var array
    */
-  public static $modules = array('system');
+  protected static $modules = array('system');
 
   /**
    * List of discovered themes.
diff --git a/core/tests/Drupal/KernelTests/Core/Theme/TwigEnvironmentTest.php b/core/tests/Drupal/KernelTests/Core/Theme/TwigEnvironmentTest.php
index deaf033..82fe4aa 100644
--- a/core/tests/Drupal/KernelTests/Core/Theme/TwigEnvironmentTest.php
+++ b/core/tests/Drupal/KernelTests/Core/Theme/TwigEnvironmentTest.php
@@ -19,7 +19,7 @@ class TwigEnvironmentTest extends KernelTestBase {
    *
    * @var array
    */
-  public static $modules = array('system');
+  protected static $modules = array('system');
 
   /**
    * Tests inline templates.
diff --git a/core/tests/Drupal/KernelTests/Core/Theme/TwigMarkupInterfaceTest.php b/core/tests/Drupal/KernelTests/Core/Theme/TwigMarkupInterfaceTest.php
index 2e6e5a4..2de4f32 100644
--- a/core/tests/Drupal/KernelTests/Core/Theme/TwigMarkupInterfaceTest.php
+++ b/core/tests/Drupal/KernelTests/Core/Theme/TwigMarkupInterfaceTest.php
@@ -29,7 +29,7 @@ class TwigMarkupInterfaceTest extends KernelTestBase {
    *
    * @var array
    */
-  public static $modules = [
+  protected static $modules = [
     'language'
   ];
 
diff --git a/core/tests/Drupal/KernelTests/Core/Theme/TwigWhiteListTest.php b/core/tests/Drupal/KernelTests/Core/Theme/TwigWhiteListTest.php
index 41984d6..933ace9 100644
--- a/core/tests/Drupal/KernelTests/Core/Theme/TwigWhiteListTest.php
+++ b/core/tests/Drupal/KernelTests/Core/Theme/TwigWhiteListTest.php
@@ -35,7 +35,7 @@ class TwigWhiteListTest extends KernelTestBase {
   /**
    * {@inheritdoc}
    */
-  public static $modules = ['node', 'taxonomy', 'user', 'system', 'text', 'field', 'entity_reference'];
+  protected static $modules = ['node', 'taxonomy', 'user', 'system', 'text', 'field', 'entity_reference'];
 
   /**
    * {@inheritdoc}
diff --git a/core/tests/Drupal/KernelTests/Core/TypedData/TypedDataTest.php b/core/tests/Drupal/KernelTests/Core/TypedData/TypedDataTest.php
index 08f27b3..5a97368 100644
--- a/core/tests/Drupal/KernelTests/Core/TypedData/TypedDataTest.php
+++ b/core/tests/Drupal/KernelTests/Core/TypedData/TypedDataTest.php
@@ -38,7 +38,7 @@ class TypedDataTest extends KernelTestBase {
    *
    * @var array
    */
-  public static $modules = array('system', 'field', 'file', 'user');
+  protected static $modules = array('system', 'field', 'file', 'user');
 
   protected function setUp() {
     parent::setup();
diff --git a/core/tests/Drupal/KernelTests/Core/Update/CompatibilityFixTest.php b/core/tests/Drupal/KernelTests/Core/Update/CompatibilityFixTest.php
index ee1b6e1..9f5b4e2 100644
--- a/core/tests/Drupal/KernelTests/Core/Update/CompatibilityFixTest.php
+++ b/core/tests/Drupal/KernelTests/Core/Update/CompatibilityFixTest.php
@@ -14,7 +14,7 @@ class CompatibilityFixTest extends KernelTestBase {
   /**
    * {@inheritdoc}
    */
-  public static $modules = ['system'];
+  protected static $modules = ['system'];
 
   protected function setUp() {
     parent::setUp();
diff --git a/core/tests/Drupal/KernelTests/Core/Url/LinkGenerationTest.php b/core/tests/Drupal/KernelTests/Core/Url/LinkGenerationTest.php
index 3d7ce5e..4996caf 100644
--- a/core/tests/Drupal/KernelTests/Core/Url/LinkGenerationTest.php
+++ b/core/tests/Drupal/KernelTests/Core/Url/LinkGenerationTest.php
@@ -14,7 +14,7 @@
  */
 class LinkGenerationTest extends KernelTestBase {
 
-  public static $modules = ['link_generation_test'];
+  protected static $modules = ['link_generation_test'];
 
   /**
    * Tests how hook_link_alter() can affect escaping of the link text.
diff --git a/core/tests/Drupal/KernelTests/RequestProcessing/RedirectOnExceptionTest.php b/core/tests/Drupal/KernelTests/RequestProcessing/RedirectOnExceptionTest.php
index c7eb3b2..f4369ed 100644
--- a/core/tests/Drupal/KernelTests/RequestProcessing/RedirectOnExceptionTest.php
+++ b/core/tests/Drupal/KernelTests/RequestProcessing/RedirectOnExceptionTest.php
@@ -16,7 +16,7 @@ class RedirectOnExceptionTest extends KernelTestBase {
   /**
    * {@inheritdoc}
    */
-  public static $modules = ['system', 'test_page_test'];
+  protected static $modules = ['system', 'test_page_test'];
 
   /**
    * {@inheritdoc}