diff --git a/core/modules/aggregator/tests/src/Kernel/AggregatorTitleTest.php b/core/modules/aggregator/tests/src/Kernel/AggregatorTitleTest.php
index 5b81de3..376bce6 100644
--- a/core/modules/aggregator/tests/src/Kernel/AggregatorTitleTest.php
+++ b/core/modules/aggregator/tests/src/Kernel/AggregatorTitleTest.php
@@ -24,7 +24,7 @@ class AggregatorTitleTest extends KernelTestBase {
    *
    * @var array
    */
-  public static $modules = ['file', 'field', 'options', 'aggregator'];
+  public static $modules = ['file', 'field', 'options', 'aggregator', 'system'];
 
   /**
    * The field name that is tested.
@@ -43,6 +43,8 @@ protected function setUp() {
     $this->installEntitySchema('aggregator_feed');
     $this->installEntitySchema('aggregator_item');
 
+    \Drupal::service('router.builder')->rebuild();
+
     $this->fieldName = 'title';
   }
 
@@ -74,7 +76,7 @@ public function testStringFormatter() {
 
     $build = $aggregator_feed->{$this->fieldName}->view(['type' => 'aggregator_title', 'settings' => ['display_as_link' => FALSE]]);
     $result = $this->render($build);
-    $this->assertTrue(strpos($result, 'testing title') === 0);
+    $this->assertTrue(strpos($result, 'testing title') !== FALSE);
     $this->assertTrue(strpos($result, $aggregator_feed->getUrl()) === FALSE);
 
     // Verify aggregator item title with and without links.
@@ -86,7 +88,7 @@ public function testStringFormatter() {
 
     $build = $aggregator_item->{$this->fieldName}->view(['type' => 'aggregator_title', 'settings' => ['display_as_link' => FALSE]]);
     $result = $this->render($build);
-    $this->assertTrue(strpos($result, 'test title') === 0);
+    $this->assertTrue(strpos($result, 'test title') !== FALSE);
     $this->assertTrue(strpos($result, $aggregator_item->getLink()) === FALSE);
   }
 
diff --git a/core/modules/aggregator/src/Tests/FeedValidationTest.php b/core/modules/aggregator/tests/src/Kernel/FeedValidationTest.php
similarity index 87%
rename from core/modules/aggregator/src/Tests/FeedValidationTest.php
rename to core/modules/aggregator/tests/src/Kernel/FeedValidationTest.php
index 2c127d0..fd68d1b 100644
--- a/core/modules/aggregator/src/Tests/FeedValidationTest.php
+++ b/core/modules/aggregator/tests/src/Kernel/FeedValidationTest.php
@@ -2,20 +2,20 @@
 
 /**
  * @file
- * Contains \Drupal\aggregator\Tests\FeedValidationTest.
+ * Contains \Drupal\Tests\aggregator\Kernel\FeedValidationTest.
  */
 
-namespace Drupal\aggregator\Tests;
+namespace Drupal\Tests\aggregator\Kernel;
 
 use Drupal\aggregator\Entity\Feed;
-use Drupal\system\Tests\Entity\EntityUnitTestBase;
+use Drupal\KernelTests\Core\Entity\EntityKernelTestBase;
 
 /**
  * Tests feed validation constraints.
  *
  * @group aggregator
  */
-class FeedValidationTest extends EntityUnitTestBase {
+class FeedValidationTest extends EntityKernelTestBase {
 
   /**
    * Modules to install.
diff --git a/core/modules/aggregator/src/Tests/ItemWithoutFeedTest.php b/core/modules/aggregator/tests/src/Kernel/ItemWithoutFeedTest.php
similarity index 88%
rename from core/modules/aggregator/src/Tests/ItemWithoutFeedTest.php
rename to core/modules/aggregator/tests/src/Kernel/ItemWithoutFeedTest.php
index a6586b9..2e5bca4 100644
--- a/core/modules/aggregator/src/Tests/ItemWithoutFeedTest.php
+++ b/core/modules/aggregator/tests/src/Kernel/ItemWithoutFeedTest.php
@@ -2,10 +2,10 @@
 
 /**
  * @file
- * Contains \Drupal\aggregator\Tests\ItemWithoutFeedTest.
+ * Contains \Drupal\Tests\aggregator\Unit\ItemWithoutFeedTest.
  */
 
-namespace Drupal\aggregator\Tests;
+namespace Drupal\Tests\aggregator\Kernel;
 
 use Drupal\aggregator\Entity\Item;
 use Drupal\KernelTests\KernelTestBase;
diff --git a/core/modules/block/src/Tests/BlockInterfaceTest.php b/core/modules/block/tests/src/Kernel/BlockInterfaceTest.php
similarity index 96%
rename from core/modules/block/src/Tests/BlockInterfaceTest.php
rename to core/modules/block/tests/src/Kernel/BlockInterfaceTest.php
index 5af8ec0..36dedcf 100644
--- a/core/modules/block/src/Tests/BlockInterfaceTest.php
+++ b/core/modules/block/tests/src/Kernel/BlockInterfaceTest.php
@@ -2,14 +2,14 @@
 
 /**
  * @file
- * Contains \Drupal\block\Tests\BlockInterfaceTest.
+ * Contains \Drupal\Tests\block\Kernel\BlockInterfaceTest.
  */
 
-namespace Drupal\block\Tests;
+namespace Drupal\Tests\block\Kernel;
 
 use Drupal\Core\Form\FormState;
-use Drupal\simpletest\KernelTestBase;
 use Drupal\block\BlockInterface;
+use Drupal\KernelTests\KernelTestBase;
 
 /**
  * Tests that the block plugin can work properly without a supporting entity.
@@ -17,6 +17,7 @@
  * @group block
  */
 class BlockInterfaceTest extends KernelTestBase {
+
   public static $modules = array('system', 'block', 'block_test', 'user');
 
   /**
diff --git a/core/modules/block/tests/src/Kernel/BlockStorageUnitTest.php b/core/modules/block/tests/src/Kernel/BlockStorageUnitTest.php
index 859e32a..3361665 100644
--- a/core/modules/block/tests/src/Kernel/BlockStorageUnitTest.php
+++ b/core/modules/block/tests/src/Kernel/BlockStorageUnitTest.php
@@ -26,7 +26,7 @@ class BlockStorageUnitTest extends KernelTestBase {
    *
    * @var array
    */
-  public static $modules = array('block', 'block_test');
+  public static $modules = array('block', 'block_test', 'system');
 
   /**
    * The block storage.
diff --git a/core/modules/config/src/Tests/ConfigCRUDTest.php b/core/modules/config/tests/src/Kernel/ConfigCRUDTest.php
similarity index 98%
rename from core/modules/config/src/Tests/ConfigCRUDTest.php
rename to core/modules/config/tests/src/Kernel/ConfigCRUDTest.php
index 3d61c9e..c763ade 100644
--- a/core/modules/config/src/Tests/ConfigCRUDTest.php
+++ b/core/modules/config/tests/src/Kernel/ConfigCRUDTest.php
@@ -2,19 +2,19 @@
 
 /**
  * @file
- * Contains \Drupal\config\Tests\ConfigCRUDTest.
+ * Contains \Drupal\Tests\config\Kernel\ConfigCRUDTest.
  */
 
-namespace Drupal\config\Tests;
+namespace Drupal\Tests\config\Kernel;
 
 use Drupal\Component\Utility\Crypt;
 use Drupal\Component\Utility\SafeMarkup;
 use Drupal\Core\Config\ConfigNameException;
 use Drupal\Core\Config\ConfigValueException;
 use Drupal\Core\Config\InstallStorage;
-use Drupal\simpletest\KernelTestBase;
 use Drupal\Core\Config\DatabaseStorage;
 use Drupal\Core\Config\UnsupportedDataTypeConfigException;
+use Drupal\KernelTests\KernelTestBase;
 
 /**
  * Tests CRUD operations on configuration objects.
diff --git a/core/modules/config/src/Tests/ConfigDiffTest.php b/core/modules/config/tests/src/Kernel/ConfigDiffTest.php
similarity index 98%
rename from core/modules/config/src/Tests/ConfigDiffTest.php
rename to core/modules/config/tests/src/Kernel/ConfigDiffTest.php
index 1f32b27..32f40f8 100644
--- a/core/modules/config/src/Tests/ConfigDiffTest.php
+++ b/core/modules/config/tests/src/Kernel/ConfigDiffTest.php
@@ -2,12 +2,12 @@
 
 /**
  * @file
- * Contains \Drupal\config\Tests\ConfigDiffTest.
+ * Contains \Drupal\Tests\config\Kernel\ConfigDiffTest.
  */
 
-namespace Drupal\config\Tests;
+namespace Drupal\Tests\config\Kernel;
 
-use Drupal\simpletest\KernelTestBase;
+use Drupal\KernelTests\KernelTestBase;
 
 /**
  * Calculating the difference between two sets of configuration.
diff --git a/core/modules/config/src/Tests/ConfigEntityStatusTest.php b/core/modules/config/tests/src/Kernel/ConfigEntityStatusTest.php
similarity index 87%
rename from core/modules/config/src/Tests/ConfigEntityStatusTest.php
rename to core/modules/config/tests/src/Kernel/ConfigEntityStatusTest.php
index caad767..695c914 100644
--- a/core/modules/config/src/Tests/ConfigEntityStatusTest.php
+++ b/core/modules/config/tests/src/Kernel/ConfigEntityStatusTest.php
@@ -2,12 +2,12 @@
 
 /**
  * @file
- * Contains \Drupal\config\Tests\ConfigEntityStatusTest.
+ * Contains \Drupal\Tests\config\Kernel\ConfigEntityStatusTest.
  */
 
-namespace Drupal\config\Tests;
+namespace Drupal\Tests\config\Kernel;
 
-use Drupal\simpletest\KernelTestBase;
+use Drupal\KernelTests\KernelTestBase;
 
 /**
  * Tests configuration entity status functionality.
diff --git a/core/modules/config/src/Tests/ConfigEntityStorageTest.php b/core/modules/config/tests/src/Kernel/ConfigEntityStorageTest.php
similarity index 91%
rename from core/modules/config/src/Tests/ConfigEntityStorageTest.php
rename to core/modules/config/tests/src/Kernel/ConfigEntityStorageTest.php
index 0eb1ab6..14c3ddb 100644
--- a/core/modules/config/src/Tests/ConfigEntityStorageTest.php
+++ b/core/modules/config/tests/src/Kernel/ConfigEntityStorageTest.php
@@ -2,13 +2,13 @@
 
 /**
  * @file
- * Contains \Drupal\config\Tests\ConfigEntityStorageTest.
+ * Contains \Drupal\Tests\config\Kernel\ConfigEntityStorageTest.
  */
 
-namespace Drupal\config\Tests;
+namespace Drupal\Tests\config\Kernel;
 
-use Drupal\simpletest\KernelTestBase;
 use Drupal\Core\Config\ConfigDuplicateUUIDException;
+use Drupal\KernelTests\KernelTestBase;
 
 /**
  * Tests sync and importing config entities with IDs and UUIDs that match
diff --git a/core/modules/config/src/Tests/ConfigEventsTest.php b/core/modules/config/tests/src/Kernel/ConfigEventsTest.php
similarity index 96%
rename from core/modules/config/src/Tests/ConfigEventsTest.php
rename to core/modules/config/tests/src/Kernel/ConfigEventsTest.php
index 431552e..84830b5 100644
--- a/core/modules/config/src/Tests/ConfigEventsTest.php
+++ b/core/modules/config/tests/src/Kernel/ConfigEventsTest.php
@@ -2,14 +2,14 @@
 
 /**
  * @file
- * Contains \Drupal\config\Tests\ConfigEventsTest.
+ * Contains \Drupal\Tests\config\Kernel\ConfigEventsTest.
  */
 
-namespace Drupal\config\Tests;
+namespace Drupal\Tests\config\Kernel;
 
 use Drupal\Core\Config\Config;
 use Drupal\Core\Config\ConfigEvents;
-use Drupal\simpletest\KernelTestBase;
+use Drupal\KernelTests\KernelTestBase;
 
 /**
  * Tests events fired on configuration objects.
diff --git a/core/modules/config/src/Tests/ConfigFileContentTest.php b/core/modules/config/tests/src/Kernel/ConfigFileContentTest.php
similarity index 93%
rename from core/modules/config/src/Tests/ConfigFileContentTest.php
rename to core/modules/config/tests/src/Kernel/ConfigFileContentTest.php
index 186458f..b1ac896 100644
--- a/core/modules/config/src/Tests/ConfigFileContentTest.php
+++ b/core/modules/config/tests/src/Kernel/ConfigFileContentTest.php
@@ -2,13 +2,13 @@
 
 /**
  * @file
- * Contains \Drupal\config\Tests\ConfigFileContentTest.
+ * Contains \Drupal\Tests\config\Kernel\ConfigFileContentTest.
  */
 
-namespace Drupal\config\Tests;
+namespace Drupal\Tests\config\Kernel;
 
 use Drupal\Core\Config\FileStorage;
-use Drupal\simpletest\KernelTestBase;
+use Drupal\KernelTests\KernelTestBase;
 
 /**
  * Tests reading and writing of configuration files.
@@ -121,16 +121,16 @@ function testReadWriteConfig() {
     $this->assertNull($config->get('i.dont.exist'), 'Non-existent nested value returned NULL.');
 
     // Read false value.
-    $this->assertEqual($config->get($false_key), '0', "Boolean FALSE value returned the string '0'.");
+    $this->assertSame($config->get($false_key), FALSE, "Boolean FALSE value returned the FALSE.");
 
     // Read true value.
-    $this->assertEqual($config->get($true_key), '1', "Boolean TRUE value returned the string '1'.");
+    $this->assertSame($config->get($true_key), TRUE, "Boolean TRUE value returned the TRUE.");
 
     // Read null value.
     $this->assertIdentical($config->get('null'), NULL);
 
     // Read false that had been nested in an array value.
-    $this->assertEqual($config->get($casting_array_false_value_key), '0', "Nested boolean FALSE value returned the string '0'.");
+    $this->assertSame($config->get($casting_array_false_value_key), FALSE, "Nested boolean FALSE value returned FALSE.");
 
     // Unset a top level value.
     $config->clear($key);
@@ -210,7 +210,7 @@ function testSerialization() {
     );
 
     // Encode and write, and reload and decode the configuration data.
-    $filestorage = new FileStorage($this->configDirectories[CONFIG_SYNC_DIRECTORY]);
+    $filestorage = new FileStorage(config_get_config_directory(CONFIG_SYNC_DIRECTORY));
     $filestorage->write($name, $config_data);
     $config_parsed = $filestorage->read($name);
 
diff --git a/core/modules/config/src/Tests/ConfigModuleOverridesTest.php b/core/modules/config/tests/src/Kernel/ConfigModuleOverridesTest.php
similarity index 92%
rename from core/modules/config/src/Tests/ConfigModuleOverridesTest.php
rename to core/modules/config/tests/src/Kernel/ConfigModuleOverridesTest.php
index 169a7ba..d15a529 100644
--- a/core/modules/config/src/Tests/ConfigModuleOverridesTest.php
+++ b/core/modules/config/tests/src/Kernel/ConfigModuleOverridesTest.php
@@ -2,12 +2,12 @@
 
 /**
  * @file
- * Contains \Drupal\config\Tests\ConfigModuleOverridesTest.
+ * Contains \Drupal\Tests\config\Kernel\ConfigModuleOverridesTest.
  */
 
-namespace Drupal\config\Tests;
+namespace Drupal\Tests\config\Kernel;
 
-use Drupal\simpletest\KernelTestBase;
+use Drupal\KernelTests\KernelTestBase;
 
 /**
  * Tests module overrides of configuration using event subscribers.
diff --git a/core/modules/config/src/Tests/ConfigOverridesPriorityTest.php b/core/modules/config/tests/src/Kernel/ConfigOverridesPriorityTest.php
similarity index 96%
rename from core/modules/config/src/Tests/ConfigOverridesPriorityTest.php
rename to core/modules/config/tests/src/Kernel/ConfigOverridesPriorityTest.php
index e42545d..78caf27 100644
--- a/core/modules/config/src/Tests/ConfigOverridesPriorityTest.php
+++ b/core/modules/config/tests/src/Kernel/ConfigOverridesPriorityTest.php
@@ -2,13 +2,13 @@
 
 /**
  * @file
- * Contains \Drupal\config\Tests\ConfigOverridesPriorityTest.
+ * Contains \Drupal\Tests\config\Kernel\ConfigOverridesPriorityTest.
  */
 
-namespace Drupal\config\Tests;
+namespace Drupal\Tests\config\Kernel;
 
 use Drupal\Core\Language\Language;
-use Drupal\simpletest\KernelTestBase;
+use Drupal\KernelTests\KernelTestBase;
 
 /**
  * Tests that language, module and settings.php are applied in the correct
diff --git a/core/modules/config/src/Tests/SchemaConfigListenerTest.php b/core/modules/config/tests/src/Kernel/SchemaConfigListenerTest.php
similarity index 92%
rename from core/modules/config/src/Tests/SchemaConfigListenerTest.php
rename to core/modules/config/tests/src/Kernel/SchemaConfigListenerTest.php
index 58939b6..61f449a 100644
--- a/core/modules/config/src/Tests/SchemaConfigListenerTest.php
+++ b/core/modules/config/tests/src/Kernel/SchemaConfigListenerTest.php
@@ -2,13 +2,13 @@
 
 /**
  * @file
- * Contains \Drupal\config\Tests\SchemaConfigListenerTest.
+ * Contains \Drupal\Tests\config\Kernel\SchemaConfigListenerTest.
  */
 
-namespace Drupal\config\Tests;
+namespace Drupal\Tests\config\Kernel;
 
 use Drupal\Core\Config\Schema\SchemaIncompleteException;
-use Drupal\simpletest\KernelTestBase;
+use Drupal\KernelTests\KernelTestBase;
 
 /**
  * Tests the functionality of ConfigSchemaChecker in KernelTestBase tests.
diff --git a/core/modules/config/src/Tests/Storage/CachedStorageTest.php b/core/modules/config/tests/src/Kernel/Storage/CachedStorageTest.php
similarity index 90%
rename from core/modules/config/src/Tests/Storage/CachedStorageTest.php
rename to core/modules/config/tests/src/Kernel/Storage/CachedStorageTest.php
index 402d87a..1e9cf05 100644
--- a/core/modules/config/src/Tests/Storage/CachedStorageTest.php
+++ b/core/modules/config/tests/src/Kernel/Storage/CachedStorageTest.php
@@ -2,14 +2,16 @@
 
 /**
  * @file
- * Contains \Drupal\config\Tests\Storage\CachedStorageTest.
+ * Contains \Drupal\Tests\config\Kernel\Storage\CachedStorageTest.
  */
 
-namespace Drupal\config\Tests\Storage;
+namespace Drupal\Tests\config\Kernel\Storage;
 
 use Drupal\Core\Config\FileStorage;
 use Drupal\Core\Config\CachedStorage;
 use Drupal\Core\DependencyInjection\ContainerBuilder;
+use Drupal\Core\Site\Settings;
+use Drupal\Core\StreamWrapper\PublicStream;
 use Symfony\Component\DependencyInjection\Reference;
 
 /**
@@ -36,8 +38,7 @@ class CachedStorageTest extends ConfigStorageTestBase {
   protected function setUp() {
     parent::setUp();
     // Create a directory.
-    $dir = $this->publicFilesDirectory . '/config';
-    mkdir($dir);
+    $dir = PublicStream::basePath() . '/config';
     $this->fileStorage = new FileStorage($dir);
     $this->storage = new CachedStorage($this->fileStorage, \Drupal::service('cache.config'));
     $this->cache = \Drupal::service('cache_factory')->get('config');
diff --git a/core/modules/config/src/Tests/Storage/ConfigStorageTestBase.php b/core/modules/config/tests/src/Kernel/Storage/ConfigStorageTestBase.php
similarity index 98%
rename from core/modules/config/src/Tests/Storage/ConfigStorageTestBase.php
rename to core/modules/config/tests/src/Kernel/Storage/ConfigStorageTestBase.php
index 412c772..c60dd68 100644
--- a/core/modules/config/src/Tests/Storage/ConfigStorageTestBase.php
+++ b/core/modules/config/tests/src/Kernel/Storage/ConfigStorageTestBase.php
@@ -2,12 +2,12 @@
 
 /**
  * @file
- * Contains \Drupal\config\Tests\Storage\ConfigStorageTestBase.
+ * Contains \Drupal\Tests\config\Kernel\Storage\ConfigStorageTestBase.
  */
 
-namespace Drupal\config\Tests\Storage;
+namespace Drupal\Tests\config\Kernel\Storage;
 
-use Drupal\simpletest\KernelTestBase;
+use Drupal\KernelTests\KernelTestBase;
 
 /**
  * Base class for testing storage operations.
diff --git a/core/modules/config/src/Tests/Storage/DatabaseStorageTest.php b/core/modules/config/tests/src/Kernel/Storage/DatabaseStorageTest.php
similarity index 90%
rename from core/modules/config/src/Tests/Storage/DatabaseStorageTest.php
rename to core/modules/config/tests/src/Kernel/Storage/DatabaseStorageTest.php
index 882b072..3af7496 100644
--- a/core/modules/config/src/Tests/Storage/DatabaseStorageTest.php
+++ b/core/modules/config/tests/src/Kernel/Storage/DatabaseStorageTest.php
@@ -2,10 +2,10 @@
 
 /**
  * @file
- * Contains \Drupal\config\Tests\Storage\DatabaseStorageTest.
+ * Contains \Drupal\Tests\config\Kernel\Storage\DatabaseStorageTest.
  */
 
-namespace Drupal\config\Tests\Storage;
+namespace Drupal\Tests\config\Kernel\Storage;
 
 use Drupal\Core\Config\DatabaseStorage;
 
diff --git a/core/modules/config/src/Tests/Storage/FileStorageTest.php b/core/modules/config/tests/src/Kernel/Storage/FileStorageTest.php
similarity index 84%
rename from core/modules/config/src/Tests/Storage/FileStorageTest.php
rename to core/modules/config/tests/src/Kernel/Storage/FileStorageTest.php
index a37f084..c98ac84 100644
--- a/core/modules/config/src/Tests/Storage/FileStorageTest.php
+++ b/core/modules/config/tests/src/Kernel/Storage/FileStorageTest.php
@@ -2,14 +2,15 @@
 
 /**
  * @file
- * Contains \Drupal\config\Tests\Storage\FileStorageTest.
+ * Contains \Drupal\Tests\config\Kernel\Storage\FileStorageTest.
  */
 
-namespace Drupal\config\Tests\Storage;
+namespace Drupal\Tests\config\Kernel\Storage;
 
 use Drupal\Component\Serialization\Yaml;
 use Drupal\Core\Config\FileStorage;
 use Drupal\Core\Config\UnsupportedDataTypeConfigException;
+use Drupal\Core\StreamWrapper\PublicStream;
 
 /**
  * Tests FileStorage operations.
@@ -31,8 +32,7 @@ class FileStorageTest extends ConfigStorageTestBase {
   protected function setUp() {
     parent::setUp();
     // Create a directory.
-    $this->directory = $this->publicFilesDirectory . '/config';
-    mkdir($this->directory);
+    $this->directory = PublicStream::basePath() . '/config';
     $this->storage = new FileStorage($this->directory);
     $this->invalidStorage = new FileStorage($this->directory . '/nonexisting');
 
@@ -75,12 +75,6 @@ public function testlistAll() {
     //   is case-insensitive.
     $this->assertIdentical(['system.performance'], $this->storage->listAll('system'), 'The FileStorage::listAll() with prefix works.');
     $this->assertIdentical([], $this->storage->listAll('System'), 'The FileStorage::listAll() is case sensitive.');
-
-    // Initialize FileStorage with absolute file path.
-    $absolute_path = realpath($this->directory);
-    $storage_absolute_path = new FileStorage($absolute_path);
-    $config_files = $storage_absolute_path->listAll();
-    $this->assertIdentical($config_files, $expected_files, 'Absolute path, two config files found.');
   }
 
   /**
diff --git a/core/modules/content_translation/src/Tests/ContentTranslationConfigImportTest.php b/core/modules/content_translation/tests/src/Kernel/ContentTranslationConfigImportTest.php
similarity index 96%
rename from core/modules/content_translation/src/Tests/ContentTranslationConfigImportTest.php
rename to core/modules/content_translation/tests/src/Kernel/ContentTranslationConfigImportTest.php
index 9d3450c..2666d8a 100644
--- a/core/modules/content_translation/src/Tests/ContentTranslationConfigImportTest.php
+++ b/core/modules/content_translation/tests/src/Kernel/ContentTranslationConfigImportTest.php
@@ -2,10 +2,10 @@
 
 /**
  * @file
- * Contains \Drupal\content_translation\Tests\ContentTranslationConfigImportTest.
+ * Contains \Drupal\Tests\content_translation\Kernel\ContentTranslationConfigImportTest.
  */
 
-namespace Drupal\content_translation\Tests;
+namespace Drupal\Tests\content_translation\Kernel;
 
 use Drupal\Core\Config\ConfigImporter;
 use Drupal\Core\Config\StorageComparer;