diff -u b/core/modules/config/src/Tests/ConfigLanguageOverrideTest.php b/core/modules/config/src/Tests/ConfigLanguageOverrideTest.php
--- b/core/modules/config/src/Tests/ConfigLanguageOverrideTest.php
+++ b/core/modules/config/src/Tests/ConfigLanguageOverrideTest.php
@@ -8,14 +8,14 @@
 namespace Drupal\config\Tests;
 
 use Drupal\language\Entity\ConfigurableLanguage;
-use Drupal\simpletest\KernelTestBase;
+use Drupal\simpletest\DrupalUnitTestBase;
 
 /**
  * Confirm that language overrides work.
  *
  * @group config
  */
-class ConfigLanguageOverrideTest extends KernelTestBase {
+class ConfigLanguageOverrideTest extends DrupalUnitTestBase {
 
   /**
    * Modules to enable.
@@ -24,6 +24,13 @@
    */
   public static $modules = array('user', 'language', 'config_test',  'system', 'field');
 
+  /**
+   * Language Manager.
+   *
+   * @var \Drupal\language\ConfigurableLanguageManager
+   */
+  protected $languageManager;
+
   protected function setUp() {
     parent::setUp();
     $this->installConfig(array('config_test'));
diff -u b/core/modules/config/src/Tests/ConfigOverridesPriorityTest.php b/core/modules/config/src/Tests/ConfigOverridesPriorityTest.php
--- b/core/modules/config/src/Tests/ConfigOverridesPriorityTest.php
+++ b/core/modules/config/src/Tests/ConfigOverridesPriorityTest.php
@@ -8,7 +8,7 @@
 namespace Drupal\config\Tests;
 
 use Drupal\Core\Language\Language;
-use Drupal\simpletest\KernelTestBase;
+use Drupal\simpletest\DrupalUnitTestBase;
 
 /**
  * Tests that language, module and settings.php are applied in the correct
@@ -16,7 +16,7 @@
  *
  * @group config
  */
-class ConfigOverridesPriorityTest extends KernelTestBase {
+class ConfigOverridesPriorityTest extends DrupalUnitTestBase {
 
   public static $modules = array('system', 'config', 'config_override_test', 'language');
 
diff -u b/core/modules/config_translation/src/Tests/ConfigTranslationUiTest.php b/core/modules/config_translation/src/Tests/ConfigTranslationUiTest.php
--- b/core/modules/config_translation/src/Tests/ConfigTranslationUiTest.php
+++ b/core/modules/config_translation/src/Tests/ConfigTranslationUiTest.php
@@ -57,6 +57,13 @@
    */
   protected $localeStorage;
 
+  /**
+   * Language Manager.
+   *
+   * @var \Drupal\language\ConfigurableLanguageManager
+   */
+  protected $languageManager;
+
   protected function setUp() {
     parent::setUp();
     $translator_permissions = array(