diff --git a/core/modules/block/src/Tests/Views/DisplayBlockTest.php b/core/modules/block/src/Tests/Views/DisplayBlockTest.php
index 012c74a..1fafbe2 100644
--- a/core/modules/block/src/Tests/Views/DisplayBlockTest.php
+++ b/core/modules/block/src/Tests/Views/DisplayBlockTest.php
@@ -23,15 +23,6 @@
 class DisplayBlockTest extends ViewTestBase {
 
   /**
-   * Set to TRUE to strict check all configuration saved.
-   *
-   * @see \Drupal\Core\Config\Testing\ConfigSchemaChecker
-   *
-   * @var bool
-   */
-  protected $strictConfigSchema = TRUE;
-
-  /**
    * Modules to install.
    *
    * @var array
diff --git a/core/modules/block_content/src/Tests/BlockContentCacheTagsTest.php b/core/modules/block_content/src/Tests/BlockContentCacheTagsTest.php
index c6e3d3f..1ea2156 100644
--- a/core/modules/block_content/src/Tests/BlockContentCacheTagsTest.php
+++ b/core/modules/block_content/src/Tests/BlockContentCacheTagsTest.php
@@ -19,15 +19,6 @@
 class BlockContentCacheTagsTest extends EntityCacheTagsTestBase {
 
   /**
-   * Set to TRUE to strict check all configuration saved.
-   *
-   * @see \Drupal\Core\Config\Testing\ConfigSchemaChecker
-   *
-   * @var bool
-   */
-  protected $strictConfigSchema = TRUE;
-
-  /**
    * {@inheritdoc}
    */
   public static $modules = array('block_content');
diff --git a/core/modules/block_content/src/Tests/BlockContentFieldTest.php b/core/modules/block_content/src/Tests/BlockContentFieldTest.php
index 26d921a..4fc7bf6 100644
--- a/core/modules/block_content/src/Tests/BlockContentFieldTest.php
+++ b/core/modules/block_content/src/Tests/BlockContentFieldTest.php
@@ -18,15 +18,6 @@
 class BlockContentFieldTest extends BlockContentTestBase {
 
   /**
-   * Set to TRUE to strict check all configuration saved.
-   *
-   * @see \Drupal\Core\Config\Testing\ConfigSchemaChecker
-   *
-   * @var bool
-   */
-  protected $strictConfigSchema = TRUE;
-
-  /**
    * Modules to enable.
    *
    * @var array
diff --git a/core/modules/block_content/src/Tests/BlockContentTranslationUITest.php b/core/modules/block_content/src/Tests/BlockContentTranslationUITest.php
index 8e3a0e7..74fc537 100644
--- a/core/modules/block_content/src/Tests/BlockContentTranslationUITest.php
+++ b/core/modules/block_content/src/Tests/BlockContentTranslationUITest.php
@@ -18,16 +18,6 @@
 class BlockContentTranslationUITest extends ContentTranslationUITest {
 
   /**
-   * Set to TRUE to strict check all configuration saved.
-   *
-   * @see \Drupal\Core\Config\Testing\ConfigSchemaChecker
-   *
-   * @var bool
-   */
-  protected $strictConfigSchema = TRUE;
-
-
-  /**
    * Modules to enable.
    *
    * @var array
diff --git a/core/modules/config/src/Tests/ConfigDependencyTest.php b/core/modules/config/src/Tests/ConfigDependencyTest.php
index e4fcf2f..88abef7 100644
--- a/core/modules/config/src/Tests/ConfigDependencyTest.php
+++ b/core/modules/config/src/Tests/ConfigDependencyTest.php
@@ -17,15 +17,6 @@
 class ConfigDependencyTest extends KernelTestBase {
 
   /**
-   * Set to TRUE to strict check all configuration saved.
-   *
-   * @see \Drupal\Core\Config\Testing\ConfigSchemaChecker
-   *
-   * @var bool
-   */
-  protected $strictConfigSchema = TRUE;
-
-  /**
    * Modules to enable.
    *
    * @var array
diff --git a/core/modules/config/src/Tests/ConfigEntityNormalizeTest.php b/core/modules/config/src/Tests/ConfigEntityNormalizeTest.php
index dcc6341..5e52cfe 100644
--- a/core/modules/config/src/Tests/ConfigEntityNormalizeTest.php
+++ b/core/modules/config/src/Tests/ConfigEntityNormalizeTest.php
@@ -11,15 +11,6 @@
  */
 class ConfigEntityNormalizeTest extends KernelTestBase {
 
-  /**
-   * Set to TRUE to strict check all configuration saved.
-   *
-   * @see \Drupal\Core\Config\Testing\ConfigSchemaChecker
-   *
-   * @var bool
-   */
-  protected $strictConfigSchema = TRUE;
-
   public static $modules = array('config_test');
 
   protected function setUp() {
diff --git a/core/modules/config/src/Tests/ConfigEventsTest.php b/core/modules/config/src/Tests/ConfigEventsTest.php
index a967128..b4f7279 100644
--- a/core/modules/config/src/Tests/ConfigEventsTest.php
+++ b/core/modules/config/src/Tests/ConfigEventsTest.php
@@ -19,15 +19,6 @@
 class ConfigEventsTest extends KernelTestBase {
 
   /**
-   * Set to TRUE to strict check all configuration saved.
-   *
-   * @see \Drupal\Core\Config\Testing\ConfigSchemaChecker
-   *
-   * @var bool
-   */
-  protected $strictConfigSchema = TRUE;
-
-  /**
    * Modules to enable.
    *
    * @var array
diff --git a/core/modules/config/src/Tests/ConfigImportRenameValidationTest.php b/core/modules/config/src/Tests/ConfigImportRenameValidationTest.php
index a7cae49..ea2face 100644
--- a/core/modules/config/src/Tests/ConfigImportRenameValidationTest.php
+++ b/core/modules/config/src/Tests/ConfigImportRenameValidationTest.php
@@ -23,15 +23,6 @@
 class ConfigImportRenameValidationTest extends KernelTestBase {
 
   /**
-   * Set to TRUE to strict check all configuration saved.
-   *
-   * @see \Drupal\Core\Config\Testing\ConfigSchemaChecker
-   *
-   * @var bool
-   */
-  protected $strictConfigSchema = TRUE;
-
-  /**
    * Config Importer object used for testing.
    *
    * @var \Drupal\Core\Config\ConfigImporter
diff --git a/core/modules/config/src/Tests/ConfigInstallTest.php b/core/modules/config/src/Tests/ConfigInstallTest.php
index 745950a..01c3bd8 100644
--- a/core/modules/config/src/Tests/ConfigInstallTest.php
+++ b/core/modules/config/src/Tests/ConfigInstallTest.php
@@ -17,15 +17,6 @@
  */
 class ConfigInstallTest extends KernelTestBase {
 
-  /**
-   * Set to TRUE to strict check all configuration saved.
-   *
-   * @see \Drupal\Core\Config\Testing\ConfigSchemaChecker
-   *
-   * @var bool
-   */
-  protected $strictConfigSchema = TRUE;
-
   protected function setUp() {
     parent::setUp();
 
diff --git a/core/modules/config/src/Tests/ConfigLanguageOverrideTest.php b/core/modules/config/src/Tests/ConfigLanguageOverrideTest.php
index 2246612..2371a88 100644
--- a/core/modules/config/src/Tests/ConfigLanguageOverrideTest.php
+++ b/core/modules/config/src/Tests/ConfigLanguageOverrideTest.php
@@ -18,15 +18,6 @@
 class ConfigLanguageOverrideTest extends KernelTestBase {
 
   /**
-   * Set to TRUE to strict check all configuration saved.
-   *
-   * @see \Drupal\Core\Config\Testing\ConfigSchemaChecker
-   *
-   * @var bool
-   */
-  protected $strictConfigSchema = TRUE;
-
-  /**
    * Modules to enable.
    *
    * @var array
diff --git a/core/modules/config/src/Tests/ConfigOverrideTest.php b/core/modules/config/src/Tests/ConfigOverrideTest.php
index 76c8203..38ba0a1 100644
--- a/core/modules/config/src/Tests/ConfigOverrideTest.php
+++ b/core/modules/config/src/Tests/ConfigOverrideTest.php
@@ -17,15 +17,6 @@
 class ConfigOverrideTest extends KernelTestBase {
 
   /**
-   * Set to TRUE to strict check all configuration saved.
-   *
-   * @see \Drupal\Core\Config\Testing\ConfigSchemaChecker
-   *
-   * @var bool
-   */
-  protected $strictConfigSchema = TRUE;
-
-  /**
    * Modules to enable.
    *
    * @var array
diff --git a/core/modules/config/src/Tests/ConfigSchemaTest.php b/core/modules/config/src/Tests/ConfigSchemaTest.php
index e87a984..202b552 100644
--- a/core/modules/config/src/Tests/ConfigSchemaTest.php
+++ b/core/modules/config/src/Tests/ConfigSchemaTest.php
@@ -21,15 +21,6 @@
 class ConfigSchemaTest extends KernelTestBase {
 
   /**
-   * Set to TRUE to strict check all configuration saved.
-   *
-   * @see \Drupal\Core\Config\Testing\ConfigSchemaChecker
-   *
-   * @var bool
-   */
-  protected $strictConfigSchema = TRUE;
-
-  /**
    * Modules to enable.
    *
    * @var array
diff --git a/core/modules/config/src/Tests/SchemaCheckTraitTest.php b/core/modules/config/src/Tests/SchemaCheckTraitTest.php
index db3be3c..a622db8 100644
--- a/core/modules/config/src/Tests/SchemaCheckTraitTest.php
+++ b/core/modules/config/src/Tests/SchemaCheckTraitTest.php
@@ -18,15 +18,6 @@
  */
 class SchemaCheckTraitTest extends KernelTestBase {
 
-  /**
-   * Set to TRUE to strict check all configuration saved.
-   *
-   * @see \Drupal\Core\Config\Testing\ConfigSchemaChecker
-   *
-   * @var bool
-   */
-  protected $strictConfigSchema = TRUE;
-
   use SchemaCheckTrait;
 
   /**
diff --git a/core/modules/config/src/Tests/SchemaConfigListenerTest.php b/core/modules/config/src/Tests/SchemaConfigListenerTest.php
index 579d916..79d9208 100644
--- a/core/modules/config/src/Tests/SchemaConfigListenerTest.php
+++ b/core/modules/config/src/Tests/SchemaConfigListenerTest.php
@@ -24,11 +24,6 @@ class SchemaConfigListenerTest extends KernelTestBase {
   public static $modules = array('config_test');
 
   /**
-   * {@inheritdoc}
-   */
-  protected $strictConfigSchema = TRUE;
-
-  /**
    * Tests \Drupal\Core\Config\Testing\ConfigSchemaChecker.
    */
   public function testConfigSchemaChecker() {
diff --git a/core/modules/config/src/Tests/SchemaConfigListenerWebTest.php b/core/modules/config/src/Tests/SchemaConfigListenerWebTest.php
index 878665c..01a1cf8 100644
--- a/core/modules/config/src/Tests/SchemaConfigListenerWebTest.php
+++ b/core/modules/config/src/Tests/SchemaConfigListenerWebTest.php
@@ -25,11 +25,6 @@ class SchemaConfigListenerWebTest extends WebTestBase {
   public static $modules = array('config_test');
 
   /**
-   * {@inheritdoc}
-   */
-  protected $strictConfigSchema = TRUE;
-
-  /**
    * Tests \Drupal\Core\Config\Testing\ConfigSchemaChecker.
    */
   public function testConfigSchemaChecker() {
diff --git a/core/modules/contact/src/Tests/ContactPersonalTest.php b/core/modules/contact/src/Tests/ContactPersonalTest.php
index 2fbab6e..b92ad85 100644
--- a/core/modules/contact/src/Tests/ContactPersonalTest.php
+++ b/core/modules/contact/src/Tests/ContactPersonalTest.php
@@ -19,15 +19,6 @@
 class ContactPersonalTest extends WebTestBase {
 
   /**
-   * Set to TRUE to strict check all configuration saved.
-   *
-   * @see \Drupal\Core\Config\Testing\ConfigSchemaChecker
-   *
-   * @var bool
-   */
-  protected $strictConfigSchema = TRUE;
-
-  /**
    * Modules to enable.
    *
    * @var array
diff --git a/core/modules/contact/src/Tests/ContactSitewideTest.php b/core/modules/contact/src/Tests/ContactSitewideTest.php
index 53d8269..b7379ca 100644
--- a/core/modules/contact/src/Tests/ContactSitewideTest.php
+++ b/core/modules/contact/src/Tests/ContactSitewideTest.php
@@ -24,15 +24,6 @@ class ContactSitewideTest extends WebTestBase {
   use FieldUiTestTrait;
 
   /**
-   * Set to TRUE to strict check all configuration saved.
-   *
-   * @see \Drupal\Core\Config\Testing\ConfigSchemaChecker
-   *
-   * @var bool
-   */
-  protected $strictConfigSchema = TRUE;
-
-  /**
    * Modules to enable.
    *
    * @var array
diff --git a/core/modules/contact/src/Tests/Views/ContactLinkTest.php b/core/modules/contact/src/Tests/Views/ContactLinkTest.php
index 060d1b8..bb7fb91 100644
--- a/core/modules/contact/src/Tests/Views/ContactLinkTest.php
+++ b/core/modules/contact/src/Tests/Views/ContactLinkTest.php
@@ -19,15 +19,6 @@
 class ContactLinkTest extends ViewTestBase {
 
   /**
-   * Set to TRUE to strict check all configuration saved.
-   *
-   * @see \Drupal\Core\Config\Testing\ConfigSchemaChecker
-   *
-   * @var bool
-   */
-  protected $strictConfigSchema = TRUE;
-
-  /**
    * Stores the user data service used by the test.
    *
    * @var \Drupal\user\UserDataInterface
diff --git a/core/modules/content_translation/src/Tests/ContentTranslationSettingsTest.php b/core/modules/content_translation/src/Tests/ContentTranslationSettingsTest.php
index 0b2102d..98a9883 100644
--- a/core/modules/content_translation/src/Tests/ContentTranslationSettingsTest.php
+++ b/core/modules/content_translation/src/Tests/ContentTranslationSettingsTest.php
@@ -22,15 +22,6 @@
 class ContentTranslationSettingsTest extends WebTestBase {
 
   /**
-   * Set to TRUE to strict check all configuration saved.
-   *
-   * @see \Drupal\Core\Config\Testing\ConfigSchemaChecker
-   *
-   * @var bool
-   */
-  protected $strictConfigSchema = TRUE;
-
-  /**
    * Modules to enable.
    *
    * @var array
diff --git a/core/modules/datetime/src/Tests/DateTimeFieldTest.php b/core/modules/datetime/src/Tests/DateTimeFieldTest.php
index 2de16ee..aa5239e 100644
--- a/core/modules/datetime/src/Tests/DateTimeFieldTest.php
+++ b/core/modules/datetime/src/Tests/DateTimeFieldTest.php
@@ -20,15 +20,6 @@
 class DateTimeFieldTest extends WebTestBase {
 
   /**
-   * Set to TRUE to strict check all configuration saved.
-   *
-   * @see \Drupal\Core\Config\Testing\ConfigSchemaChecker
-   *
-   * @var bool
-   */
-  protected $strictConfigSchema = TRUE;
-
-  /**
    * Modules to enable.
    *
    * @var array
diff --git a/core/modules/entity_reference/src/Tests/Views/SelectionTest.php b/core/modules/entity_reference/src/Tests/Views/SelectionTest.php
index 1fbe5cb..823e46f 100644
--- a/core/modules/entity_reference/src/Tests/Views/SelectionTest.php
+++ b/core/modules/entity_reference/src/Tests/Views/SelectionTest.php
@@ -16,15 +16,6 @@
  */
 class SelectionTest extends WebTestBase {
 
-  /**
-   * Set to TRUE to strict check all configuration saved.
-   *
-   * @see \Drupal\Core\Config\Testing\ConfigSchemaChecker
-   *
-   * @var bool
-   */
-  protected $strictConfigSchema = TRUE;
-
   public static $modules = array('node', 'views', 'entity_reference', 'entity_reference_test', 'entity_test');
 
   /**
diff --git a/core/modules/field/src/Tests/DisplayApiTest.php b/core/modules/field/src/Tests/DisplayApiTest.php
index 513de0b..4123ab3 100644
--- a/core/modules/field/src/Tests/DisplayApiTest.php
+++ b/core/modules/field/src/Tests/DisplayApiTest.php
@@ -17,15 +17,6 @@
 class DisplayApiTest extends FieldUnitTestBase {
 
   /**
-   * Set to TRUE to strict check all configuration saved.
-   *
-   * @see \Drupal\Core\Config\Testing\ConfigSchemaChecker
-   *
-   * @var bool
-   */
-  protected $strictConfigSchema = TRUE;
-
-  /**
    * The field name to use in this test.
    *
    * @var string
diff --git a/core/modules/field/src/Tests/Email/EmailFieldTest.php b/core/modules/field/src/Tests/Email/EmailFieldTest.php
index bfc8e86..2ce3c46 100644
--- a/core/modules/field/src/Tests/Email/EmailFieldTest.php
+++ b/core/modules/field/src/Tests/Email/EmailFieldTest.php
@@ -18,15 +18,6 @@
 class EmailFieldTest extends WebTestBase {
 
   /**
-   * Set to TRUE to strict check all configuration saved.
-   *
-   * @see \Drupal\Core\Config\Testing\ConfigSchemaChecker
-   *
-   * @var bool
-   */
-  protected $strictConfigSchema = TRUE;
-
-  /**
    * Modules to enable.
    *
    * @var array
diff --git a/core/modules/field/src/Tests/FieldImportDeleteUninstallUiTest.php b/core/modules/field/src/Tests/FieldImportDeleteUninstallUiTest.php
index 1880818..939cfc4 100644
--- a/core/modules/field/src/Tests/FieldImportDeleteUninstallUiTest.php
+++ b/core/modules/field/src/Tests/FieldImportDeleteUninstallUiTest.php
@@ -19,15 +19,6 @@
 class FieldImportDeleteUninstallUiTest extends FieldTestBase {
 
   /**
-   * Set to TRUE to strict check all configuration saved.
-   *
-   * @see \Drupal\Core\Config\Testing\ConfigSchemaChecker
-   *
-   * @var bool
-   */
-  protected $strictConfigSchema = TRUE;
-
-  /**
    * Modules to enable.
    *
    * @var array
diff --git a/core/modules/field/src/Tests/FormTest.php b/core/modules/field/src/Tests/FormTest.php
index fde1f29..9274624 100644
--- a/core/modules/field/src/Tests/FormTest.php
+++ b/core/modules/field/src/Tests/FormTest.php
@@ -19,15 +19,6 @@
 class FormTest extends FieldTestBase {
 
   /**
-   * Set to TRUE to strict check all configuration saved.
-   *
-   * @see \Drupal\Core\Config\Testing\ConfigSchemaChecker
-   *
-   * @var bool
-   */
-  protected $strictConfigSchema = TRUE;
-
-  /**
    * Modules to enable.
    *
    * @var array
diff --git a/core/modules/field/src/Tests/Number/NumberFieldTest.php b/core/modules/field/src/Tests/Number/NumberFieldTest.php
index 0c1d558..0c146ea 100644
--- a/core/modules/field/src/Tests/Number/NumberFieldTest.php
+++ b/core/modules/field/src/Tests/Number/NumberFieldTest.php
@@ -18,15 +18,6 @@
 class NumberFieldTest extends WebTestBase {
 
   /**
-   * Set to TRUE to strict check all configuration saved.
-   *
-   * @see \Drupal\Core\Config\Testing\ConfigSchemaChecker
-   *
-   * @var bool
-   */
-  protected $strictConfigSchema = TRUE;
-
-  /**
    * Modules to enable.
    *
    * @var array
diff --git a/core/modules/field/src/Tests/ShapeItemTest.php b/core/modules/field/src/Tests/ShapeItemTest.php
index 05c1606..548d63e 100644
--- a/core/modules/field/src/Tests/ShapeItemTest.php
+++ b/core/modules/field/src/Tests/ShapeItemTest.php
@@ -18,15 +18,6 @@
 class ShapeItemTest extends FieldUnitTestBase {
 
   /**
-   * Set to TRUE to strict check all configuration saved.
-   *
-   * @see \Drupal\Core\Config\Testing\ConfigSchemaChecker
-   *
-   * @var bool
-   */
-  protected $strictConfigSchema = TRUE;
-
-  /**
    * Modules to enable.
    *
    * @var array
diff --git a/core/modules/field/src/Tests/String/StringFieldTest.php b/core/modules/field/src/Tests/String/StringFieldTest.php
index 625d22c..fd5699e 100644
--- a/core/modules/field/src/Tests/String/StringFieldTest.php
+++ b/core/modules/field/src/Tests/String/StringFieldTest.php
@@ -18,15 +18,6 @@
 class StringFieldTest extends WebTestBase {
 
   /**
-   * Set to TRUE to strict check all configuration saved.
-   *
-   * @see \Drupal\Core\Config\Testing\ConfigSchemaChecker
-   *
-   * @var bool
-   */
-  protected $strictConfigSchema = TRUE;
-
-  /**
    * Modules to enable.
    *
    * @var array
diff --git a/core/modules/field/src/Tests/TestItemWithDependenciesTest.php b/core/modules/field/src/Tests/TestItemWithDependenciesTest.php
index 684cc0f..b5ad7e1 100644
--- a/core/modules/field/src/Tests/TestItemWithDependenciesTest.php
+++ b/core/modules/field/src/Tests/TestItemWithDependenciesTest.php
@@ -15,15 +15,6 @@
 class TestItemWithDependenciesTest extends FieldUnitTestBase {
 
   /**
-   * Set to TRUE to strict check all configuration saved.
-   *
-   * @see \Drupal\Core\Config\Testing\ConfigSchemaChecker
-   *
-   * @var bool
-   */
-  protected $strictConfigSchema = TRUE;
-
-  /**
    * Modules to enable.
    *
    * @var array
diff --git a/core/modules/field_ui/src/Tests/EntityDisplayTest.php b/core/modules/field_ui/src/Tests/EntityDisplayTest.php
index efcd9e0..9cfb55e 100644
--- a/core/modules/field_ui/src/Tests/EntityDisplayTest.php
+++ b/core/modules/field_ui/src/Tests/EntityDisplayTest.php
@@ -17,15 +17,6 @@
  */
 class EntityDisplayTest extends KernelTestBase {
 
-  /**
-   * Set to TRUE to strict check all configuration saved.
-   *
-   * @see \Drupal\Core\Config\Testing\ConfigSchemaChecker
-   *
-   * @var bool
-   */
-  protected $strictConfigSchema = TRUE;
-
   public static $modules = array('field_ui', 'field', 'entity_test', 'user', 'text', 'field_test', 'node', 'system', 'entity_reference');
 
   protected function setUp() {
diff --git a/core/modules/field_ui/src/Tests/EntityFormDisplayTest.php b/core/modules/field_ui/src/Tests/EntityFormDisplayTest.php
index 5ce4e9a..057d575 100644
--- a/core/modules/field_ui/src/Tests/EntityFormDisplayTest.php
+++ b/core/modules/field_ui/src/Tests/EntityFormDisplayTest.php
@@ -17,15 +17,6 @@
  */
 class EntityFormDisplayTest extends KernelTestBase {
 
-  /**
-   * Set to TRUE to strict check all configuration saved.
-   *
-   * @see \Drupal\Core\Config\Testing\ConfigSchemaChecker
-   *
-   * @var bool
-   */
-  protected $strictConfigSchema = TRUE;
-
   public static $modules = array('field_ui', 'field', 'entity_test', 'field_test', 'user', 'text', 'entity_reference');
 
   protected function setUp() {
diff --git a/core/modules/field_ui/src/Tests/ManageDisplayTest.php b/core/modules/field_ui/src/Tests/ManageDisplayTest.php
index 5c8e276..e628757 100644
--- a/core/modules/field_ui/src/Tests/ManageDisplayTest.php
+++ b/core/modules/field_ui/src/Tests/ManageDisplayTest.php
@@ -19,15 +19,6 @@
  */
 class ManageDisplayTest extends WebTestBase {
 
-  /**
-   * Set to TRUE to strict check all configuration saved.
-   *
-   * @see \Drupal\Core\Config\Testing\ConfigSchemaChecker
-   *
-   * @var bool
-   */
-  protected $strictConfigSchema = TRUE;
-
   use FieldUiTestTrait;
 
   /**
diff --git a/core/modules/field_ui/src/Tests/ManageFieldsTest.php b/core/modules/field_ui/src/Tests/ManageFieldsTest.php
index 84fbca6..8c2adb6 100644
--- a/core/modules/field_ui/src/Tests/ManageFieldsTest.php
+++ b/core/modules/field_ui/src/Tests/ManageFieldsTest.php
@@ -21,15 +21,6 @@
  */
 class ManageFieldsTest extends WebTestBase {
 
-  /**
-   * Set to TRUE to strict check all configuration saved.
-   *
-   * @see \Drupal\Core\Config\Testing\ConfigSchemaChecker
-   *
-   * @var bool
-   */
-  protected $strictConfigSchema = TRUE;
-
   use FieldUiTestTrait;
 
   /**
diff --git a/core/modules/image/src/Tests/ImageFieldTestBase.php b/core/modules/image/src/Tests/ImageFieldTestBase.php
index 0360318..2b8a648 100644
--- a/core/modules/image/src/Tests/ImageFieldTestBase.php
+++ b/core/modules/image/src/Tests/ImageFieldTestBase.php
@@ -28,15 +28,6 @@
 abstract class ImageFieldTestBase extends WebTestBase {
 
   /**
-   * Set to TRUE to strict check all configuration saved.
-   *
-   * @see \Drupal\Core\Config\Testing\ConfigSchemaChecker
-   *
-   * @var bool
-   */
-  protected $strictConfigSchema = TRUE;
-
-  /**
    * Modules to enable.
    *
    * @var array
diff --git a/core/modules/link/src/Tests/LinkFieldTest.php b/core/modules/link/src/Tests/LinkFieldTest.php
index 685b145..97058f0 100644
--- a/core/modules/link/src/Tests/LinkFieldTest.php
+++ b/core/modules/link/src/Tests/LinkFieldTest.php
@@ -21,15 +21,6 @@
 class LinkFieldTest extends WebTestBase {
 
   /**
-   * Set to TRUE to strict check all configuration saved.
-   *
-   * @see \Drupal\Core\Config\Testing\ConfigSchemaChecker
-   *
-   * @var bool
-   */
-  protected $strictConfigSchema = TRUE;
-
-  /**
    * Modules to enable.
    *
    * @var array
diff --git a/core/modules/migrate_drupal/src/Tests/MigrateDrupalTestBase.php b/core/modules/migrate_drupal/src/Tests/MigrateDrupalTestBase.php
index 3538267..91e20ff 100644
--- a/core/modules/migrate_drupal/src/Tests/MigrateDrupalTestBase.php
+++ b/core/modules/migrate_drupal/src/Tests/MigrateDrupalTestBase.php
@@ -15,15 +15,6 @@
 abstract class MigrateDrupalTestBase extends MigrateTestBase {
 
   /**
-   * Set to TRUE to strict check all configuration saved.
-   *
-   * @see \Drupal\Core\Config\Testing\ConfigSchemaChecker
-   *
-   * @var bool
-   */
-  protected $strictConfigSchema = TRUE;
-
-  /**
    * Modules to enable.
    *
    * @var array
diff --git a/core/modules/migrate_drupal/src/Tests/d6/MigrateFieldInstanceTest.php b/core/modules/migrate_drupal/src/Tests/d6/MigrateFieldInstanceTest.php
index df97d24..31f206d 100644
--- a/core/modules/migrate_drupal/src/Tests/d6/MigrateFieldInstanceTest.php
+++ b/core/modules/migrate_drupal/src/Tests/d6/MigrateFieldInstanceTest.php
@@ -20,15 +20,6 @@
 class MigrateFieldInstanceTest extends MigrateDrupalTestBase {
 
   /**
-   * Set to TRUE to strict check all configuration saved.
-   *
-   * @see \Drupal\Core\Config\Testing\ConfigSchemaChecker
-   *
-   * @var bool
-   */
-  protected $strictConfigSchema = TRUE;
-
-  /**
    * Modules to enable.
    *
    * @var array
diff --git a/core/modules/migrate_drupal/src/Tests/d6/MigrateFieldWidgetSettingsTest.php b/core/modules/migrate_drupal/src/Tests/d6/MigrateFieldWidgetSettingsTest.php
index e970272..09b922c 100644
--- a/core/modules/migrate_drupal/src/Tests/d6/MigrateFieldWidgetSettingsTest.php
+++ b/core/modules/migrate_drupal/src/Tests/d6/MigrateFieldWidgetSettingsTest.php
@@ -18,15 +18,6 @@
 class MigrateFieldWidgetSettingsTest extends MigrateDrupalTestBase {
 
   /**
-   * Set to TRUE to strict check all configuration saved.
-   *
-   * @see \Drupal\Core\Config\Testing\ConfigSchemaChecker
-   *
-   * @var bool
-   */
-  protected $strictConfigSchema = TRUE;
-
-  /**
    * Modules to enable.
    *
    * @var array
diff --git a/core/modules/options/src/Tests/OptionsFloatFieldImportTest.php b/core/modules/options/src/Tests/OptionsFloatFieldImportTest.php
index a555339..0f8414f 100644
--- a/core/modules/options/src/Tests/OptionsFloatFieldImportTest.php
+++ b/core/modules/options/src/Tests/OptionsFloatFieldImportTest.php
@@ -19,15 +19,6 @@
 class OptionsFloatFieldImportTest extends FieldTestBase {
 
   /**
-   * Set to TRUE to strict check all configuration saved.
-   *
-   * @see \Drupal\Core\Config\Testing\ConfigSchemaChecker
-   *
-   * @var bool
-   */
-  protected $strictConfigSchema = TRUE;
-
-  /**
    * Modules to enable.
    *
    * @var array
diff --git a/core/modules/quickedit/src/Tests/QuickEditTestBase.php b/core/modules/quickedit/src/Tests/QuickEditTestBase.php
index 1536194..fbbd1a7 100644
--- a/core/modules/quickedit/src/Tests/QuickEditTestBase.php
+++ b/core/modules/quickedit/src/Tests/QuickEditTestBase.php
@@ -15,15 +15,6 @@
 abstract class QuickEditTestBase extends KernelTestBase {
 
   /**
-   * Set to TRUE to strict check all configuration saved.
-   *
-   * @see \Drupal\Core\Config\Testing\ConfigSchemaChecker
-   *
-   * @var bool
-   */
-  protected $strictConfigSchema = TRUE;
-
-  /**
    * Modules to enable.
    *
    * @var array
diff --git a/core/modules/simpletest/src/TestBase.php b/core/modules/simpletest/src/TestBase.php
index a766d63..806281e 100644
--- a/core/modules/simpletest/src/TestBase.php
+++ b/core/modules/simpletest/src/TestBase.php
@@ -209,7 +209,7 @@
    *
    * @var bool
    */
-  protected $strictConfigSchema = FALSE;
+  protected $strictConfigSchema = TRUE;
 
   /**
    * Constructor for Test.
diff --git a/core/modules/system/src/Tests/Batch/PageTest.php b/core/modules/system/src/Tests/Batch/PageTest.php
index c4b1b70..42800b7 100644
--- a/core/modules/system/src/Tests/Batch/PageTest.php
+++ b/core/modules/system/src/Tests/Batch/PageTest.php
@@ -17,15 +17,6 @@
 class PageTest extends WebTestBase {
 
   /**
-   * Set to TRUE to strict check all configuration saved.
-   *
-   * @see \Drupal\Core\Config\Testing\ConfigSchemaChecker
-   *
-   * @var bool
-   */
-  protected $strictConfigSchema = TRUE;
-
-  /**
    * Modules to enable.
    *
    * @var array
diff --git a/core/modules/system/src/Tests/Entity/EntityQueryRelationshipTest.php b/core/modules/system/src/Tests/Entity/EntityQueryRelationshipTest.php
index 4c8269a..681ebaa 100644
--- a/core/modules/system/src/Tests/Entity/EntityQueryRelationshipTest.php
+++ b/core/modules/system/src/Tests/Entity/EntityQueryRelationshipTest.php
@@ -16,15 +16,6 @@
 class EntityQueryRelationshipTest extends EntityUnitTestBase  {
 
   /**
-   * Set to TRUE to strict check all configuration saved.
-   *
-   * @see \Drupal\Core\Config\Testing\ConfigSchemaChecker
-   *
-   * @var bool
-   */
-  protected $strictConfigSchema = TRUE;
-
-  /**
    * Modules to enable.
    *
    * @var array
diff --git a/core/modules/system/src/Tests/Entity/EntityViewControllerTest.php b/core/modules/system/src/Tests/Entity/EntityViewControllerTest.php
index 93f75df..aa2d800 100644
--- a/core/modules/system/src/Tests/Entity/EntityViewControllerTest.php
+++ b/core/modules/system/src/Tests/Entity/EntityViewControllerTest.php
@@ -17,15 +17,6 @@
 class EntityViewControllerTest extends WebTestBase {
 
   /**
-   * Set to TRUE to strict check all configuration saved.
-   *
-   * @see \Drupal\Core\Config\Testing\ConfigSchemaChecker
-   *
-   * @var bool
-   */
-  protected $strictConfigSchema = TRUE;
-
-  /**
    * Modules to enable.
    *
    * @var array
diff --git a/core/modules/system/src/Tests/Extension/ThemeHandlerTest.php b/core/modules/system/src/Tests/Extension/ThemeHandlerTest.php
index 36c17d9..50d299c 100644
--- a/core/modules/system/src/Tests/Extension/ThemeHandlerTest.php
+++ b/core/modules/system/src/Tests/Extension/ThemeHandlerTest.php
@@ -19,15 +19,6 @@
 class ThemeHandlerTest extends KernelTestBase {
 
   /**
-   * Set to TRUE to strict check all configuration saved.
-   *
-   * @see \Drupal\Core\Config\Testing\ConfigSchemaChecker
-   *
-   * @var bool
-   */
-  protected $strictConfigSchema = TRUE;
-
-  /**
    * Modules to enable.
    *
    * @var array
diff --git a/core/modules/system/src/Tests/Form/FormObjectTest.php b/core/modules/system/src/Tests/Form/FormObjectTest.php
index c41928a..237d9e7 100644
--- a/core/modules/system/src/Tests/Form/FormObjectTest.php
+++ b/core/modules/system/src/Tests/Form/FormObjectTest.php
@@ -18,15 +18,6 @@
 class FormObjectTest extends SystemConfigFormTestBase {
 
   /**
-   * Set to TRUE to strict check all configuration saved.
-   *
-   * @see \Drupal\Core\Config\Testing\ConfigSchemaChecker
-   *
-   * @var bool
-   */
-  protected $strictConfigSchema = TRUE;
-
-  /**
    * Modules to enable.
    *
    * @var array
diff --git a/core/modules/system/src/Tests/Menu/BreadcrumbTest.php b/core/modules/system/src/Tests/Menu/BreadcrumbTest.php
index 22a2f7d..6909a38 100644
--- a/core/modules/system/src/Tests/Menu/BreadcrumbTest.php
+++ b/core/modules/system/src/Tests/Menu/BreadcrumbTest.php
@@ -19,15 +19,6 @@
 class BreadcrumbTest extends MenuTestBase {
 
   /**
-   * Set to TRUE to strict check all configuration saved.
-   *
-   * @see \Drupal\Core\Config\Testing\ConfigSchemaChecker
-   *
-   * @var bool
-   */
-  protected $strictConfigSchema = TRUE;
-
-  /**
    * Modules to enable.
    *
    * @var array
diff --git a/core/modules/system/src/Tests/Menu/MenuRouterTest.php b/core/modules/system/src/Tests/Menu/MenuRouterTest.php
index 4dd2e19..7de9006 100644
--- a/core/modules/system/src/Tests/Menu/MenuRouterTest.php
+++ b/core/modules/system/src/Tests/Menu/MenuRouterTest.php
@@ -17,15 +17,6 @@
 class MenuRouterTest extends WebTestBase {
 
   /**
-   * Set to TRUE to strict check all configuration saved.
-   *
-   * @see \Drupal\Core\Config\Testing\ConfigSchemaChecker
-   *
-   * @var bool
-   */
-  protected $strictConfigSchema = TRUE;
-
-  /**
    * Modules to enable.
    *
    * @var array
diff --git a/core/modules/system/src/Tests/System/PageTitleTest.php b/core/modules/system/src/Tests/System/PageTitleTest.php
index 31020c9..98148cd 100644
--- a/core/modules/system/src/Tests/System/PageTitleTest.php
+++ b/core/modules/system/src/Tests/System/PageTitleTest.php
@@ -20,15 +20,6 @@
 class PageTitleTest extends WebTestBase {
 
   /**
-   * Set to TRUE to strict check all configuration saved.
-   *
-   * @see \Drupal\Core\Config\Testing\ConfigSchemaChecker
-   *
-   * @var bool
-   */
-  protected $strictConfigSchema = TRUE;
-
-  /**
    * Modules to enable.
    *
    * @var array
diff --git a/core/modules/system/src/Tests/System/ThemeTest.php b/core/modules/system/src/Tests/System/ThemeTest.php
index 8a7fd04..80d469a 100644
--- a/core/modules/system/src/Tests/System/ThemeTest.php
+++ b/core/modules/system/src/Tests/System/ThemeTest.php
@@ -19,15 +19,6 @@
 class ThemeTest extends WebTestBase {
 
   /**
-   * Set to TRUE to strict check all configuration saved.
-   *
-   * @see \Drupal\Core\Config\Testing\ConfigSchemaChecker
-   *
-   * @var bool
-   */
-  protected $strictConfigSchema = TRUE;
-
-  /**
    * Modules to enable.
    *
    * @var array
diff --git a/core/modules/views/src/Tests/ViewTestBase.php b/core/modules/views/src/Tests/ViewTestBase.php
index b7ab8c1..c33776d 100644
--- a/core/modules/views/src/Tests/ViewTestBase.php
+++ b/core/modules/views/src/Tests/ViewTestBase.php
@@ -24,15 +24,6 @@
 abstract class ViewTestBase extends WebTestBase {
 
   /**
-   * Set to TRUE to strict check all configuration saved.
-   *
-   * @see \Drupal\Core\Config\Testing\ConfigSchemaChecker
-   *
-   * @var bool
-   */
-  protected $strictConfigSchema = TRUE;
-
-  /**
    * Modules to enable.
    *
    * @var array
diff --git a/core/modules/views/src/Tests/ViewUnitTestBase.php b/core/modules/views/src/Tests/ViewUnitTestBase.php
index a5bdd3e..0d07484 100644
--- a/core/modules/views/src/Tests/ViewUnitTestBase.php
+++ b/core/modules/views/src/Tests/ViewUnitTestBase.php
@@ -25,15 +25,6 @@
 abstract class ViewUnitTestBase extends KernelTestBase {
 
   /**
-   * Set to TRUE to strict check all configuration saved.
-   *
-   * @see \Drupal\Core\Config\Testing\ConfigSchemaChecker
-   *
-   * @var bool
-   */
-  protected $strictConfigSchema = TRUE;
-
-  /**
    * Modules to enable.
    *
    * @var array
diff --git a/core/modules/views/src/Tests/Wizard/WizardTestBase.php b/core/modules/views/src/Tests/Wizard/WizardTestBase.php
index 16907b8..0a2e998 100644
--- a/core/modules/views/src/Tests/Wizard/WizardTestBase.php
+++ b/core/modules/views/src/Tests/Wizard/WizardTestBase.php
@@ -15,15 +15,6 @@
 abstract class WizardTestBase extends ViewTestBase {
 
   /**
-   * Set to TRUE to strict check all configuration saved.
-   *
-   * @see \Drupal\Core\Config\Testing\ConfigSchemaChecker
-   *
-   * @var bool
-   */
-  protected $strictConfigSchema = TRUE;
-
-  /**
    * Modules to enable.
    *
    * @var array
diff --git a/core/modules/views_ui/src/Tests/NewViewConfigSchemaTest.php b/core/modules/views_ui/src/Tests/NewViewConfigSchemaTest.php
index 315d17a..69239b4 100644
--- a/core/modules/views_ui/src/Tests/NewViewConfigSchemaTest.php
+++ b/core/modules/views_ui/src/Tests/NewViewConfigSchemaTest.php
@@ -17,15 +17,6 @@
 class NewViewConfigSchemaTest extends WebTestBase {
 
   /**
-   * Set to TRUE to strict check all configuration saved.
-   *
-   * @see \Drupal\Core\Config\Testing\ConfigSchemaChecker
-   *
-   * @var bool
-   */
-  protected $strictConfigSchema = TRUE;
-
-  /**
    * Modules to enable.
    *
    * @var array