diff --git a/core/modules/config_translation/src/Tests/ConfigTranslationOverviewTest.php b/core/modules/config_translation/src/Tests/ConfigTranslationOverviewTest.php
index 7e513b4..13b56d5 100644
--- a/core/modules/config_translation/src/Tests/ConfigTranslationOverviewTest.php
+++ b/core/modules/config_translation/src/Tests/ConfigTranslationOverviewTest.php
@@ -8,10 +8,8 @@
 namespace Drupal\config_translation\Tests;
 
 use Drupal\Component\Utility\Html;
-use Drupal\Core\Routing\RouteMatch;
 use Drupal\language\Entity\ConfigurableLanguage;
 use Drupal\simpletest\WebTestBase;
-use Symfony\Component\Routing\Route;
 
 /**
  * Translate settings and entities to various languages.
@@ -176,24 +174,4 @@ public function testListingPageWithOverrides() {
     $this->assertNoText($overridden_label);
   }
 
-  /**
-   * Tests adding config names to mapper.
-   */
-  public function testAddingConfigNames() {
-    // Get a config names mapper.
-    $mappers = \Drupal::service('plugin.manager.config_translation.mapper')->getMappers();
-    $mapper = $mappers['system.site_information_settings'];
-
-    // Test that it doesn't contain a config name from config_translation_test.
-    $config_names = $mapper->getConfigNames();
-    $this->assertFalse(in_array('config_translation_test.content.test.label', $config_names));
-
-    // Call populateFromRouteMatch() to dispatch an event.
-    $mapper->populateFromRouteMatch(new RouteMatch('test', new Route('/')));
-
-    // Test that it now contains the new config name from config_translation_test.
-    $config_names = $mapper->getConfigNames();
-    $this->assertTrue(in_array('config_translation_test.content.test.label', $config_names));
-  }
-
 }
diff --git a/core/modules/config_translation/tests/modules/config_translation_test/src/EventSubscriber/ConfigTranslationTestSubscriber.php b/core/modules/config_translation/tests/modules/config_translation_test/src/EventSubscriber/ConfigTranslationTestSubscriber.php
index 3f03745..a2e794f 100644
--- a/core/modules/config_translation/tests/modules/config_translation_test/src/EventSubscriber/ConfigTranslationTestSubscriber.php
+++ b/core/modules/config_translation/tests/modules/config_translation_test/src/EventSubscriber/ConfigTranslationTestSubscriber.php
@@ -15,7 +15,7 @@ static function getSubscribedEvents() {
 
   public function addConfigNames(ConfigMapperEvent $event) {
     $mapper = $event->getMapper();
-    $mapper->addConfigName('config_translation_test.content.test.label');
+    $mapper->addConfigName('config_translation_test.content');
   }
 
 }
diff --git a/core/modules/config_translation/tests/src/Kernel/ConfigMapperTest.php b/core/modules/config_translation/tests/src/Kernel/ConfigMapperTest.php
new file mode 100644
index 0000000..681ce7c
--- /dev/null
+++ b/core/modules/config_translation/tests/src/Kernel/ConfigMapperTest.php
@@ -0,0 +1,52 @@
+<?php
+
+/**
+ * @file
+ * Contains \Drupal\Tests\config_translation\Kernel\ConfigMapperTest.
+ */
+
+namespace Drupal\Tests\config_translation\Kernel;
+
+use Drupal\Core\Routing\RouteMatch;
+use Drupal\KernelTests\KernelTestBase;
+use Symfony\Component\Routing\Route;
+
+/**
+ * Tests config mapper.
+ *
+ * @group config_translation
+ */
+class ConfigMapperTest extends KernelTestBase {
+
+  /**
+   * {@inheritdoc}
+   */
+  public static $modules = [
+    'config_translation',
+    'config_translation_test',
+    'language',
+    'locale',
+    'system',
+  ];
+
+  /**
+   * Tests adding config names to mapper.
+   */
+  public function testAddingConfigNames() {
+    // Get a config names mapper.
+    $mappers = \Drupal::service('plugin.manager.config_translation.mapper')->getMappers();
+    $mapper = $mappers['system.site_information_settings'];
+
+    // Test that it doesn't contain a config name from config_translation_test.
+    $config_names = $mapper->getConfigNames();
+    $this->assertFalse(in_array('config_translation_test.content', $config_names));
+
+    // Call populateFromRouteMatch() to dispatch an event.
+    $mapper->populateFromRouteMatch(new RouteMatch('test', new Route('/')));
+
+    // Test that it now contains the new config name from config_translation_test.
+    $config_names = $mapper->getConfigNames();
+    $this->assertTrue(in_array('config_translation_test.content', $config_names));
+  }
+
+}