diff --git a/search_api_db/tests/src/Kernel/BackendTest.php b/search_api_db/tests/src/Kernel/BackendTest.php
index 570871c..664376f 100644
--- a/search_api_db/tests/src/Kernel/BackendTest.php
+++ b/search_api_db/tests/src/Kernel/BackendTest.php
@@ -38,7 +38,15 @@ class BackendTest extends KernelTestBase {
    *
    * @var string[]
    */
-  public static $modules = array('field', 'search_api', 'search_api_db', 'search_api_test_db');
+  public static $modules = array(
+    'field',
+    'search_api',
+    'search_api_db',
+    'search_api_test_db',
+    'user',
+    'system',
+    'entity_test',
+  );
 
   /**
    * A search server ID.
diff --git a/tests/src/Kernel/CliTest.php b/tests/src/Kernel/CliTest.php
index 3d6f6cf..1714c23 100644
--- a/tests/src/Kernel/CliTest.php
+++ b/tests/src/Kernel/CliTest.php
@@ -31,7 +31,13 @@ class CliTest extends KernelTestBase {
    *
    * @var string[]
    */
-  public static $modules = array('search_api', 'search_api_test_backend');
+  public static $modules = array(
+    'search_api',
+    'search_api_test_backend',
+    'user',
+    'system',
+    'entity_test',
+  );
 
   /**
    * {@inheritdoc}
@@ -41,6 +47,7 @@ class CliTest extends KernelTestBase {
 
     $this->installSchema('search_api', array('search_api_item', 'search_api_task'));
     $this->installSchema('system', 'queue');
+    $this->installEntitySchema('entity_test');
 
     // Create a test server.
     $this->server = Server::create(array(
@@ -72,14 +79,14 @@ class CliTest extends KernelTestBase {
       'type' => 'item',
       'keywords' => array('Orange', 'orange', 'örange', 'Orange'),
       'category' => 'item_category'
-    ));
+    ))->save();
     EntityTest::create(array(
       'name' => 'foo bar baz föö smile',
       'body' => 'test test case Case casE',
       'type' => 'item',
       'keywords' => array('strawberry', 'llama'),
       'category' => 'item_category'
-    ));
+    ))->save();
 
     // Create a test index.
     /** @var \Drupal\search_api\IndexInterface $index */
@@ -106,14 +113,14 @@ class CliTest extends KernelTestBase {
       'type' => 'item',
       'keywords' => array('strawberry', 'llama'),
       'category' => 'item_category'
-    ));
+    ))->save();
     EntityTest::create(array(
       'name' => 'foo bar baz föö smile',
       'body' => 'test test case Case casE',
       'type' => 'item',
       'keywords' => array('strawberry', 'llama'),
       'category' => 'item_category'
-    ));
+    ))->save();
 
     $total_items = $index->getTracker()->getTotalItemsCount();
     $indexed_items = $index->getTracker()->getIndexedItemsCount();
diff --git a/tests/src/Kernel/CustomDataTypesTest.php b/tests/src/Kernel/CustomDataTypesTest.php
index 5261f1e..9f1a36c 100644
--- a/tests/src/Kernel/CustomDataTypesTest.php
+++ b/tests/src/Kernel/CustomDataTypesTest.php
@@ -45,9 +45,19 @@ class CustomDataTypesTest extends KernelTestBase {
     'search_api_db',
     'search_api_test_db',
     'search_api_test_backend',
+    'user',
+    'system',
+    'entity_test',
   );
 
   /**
+   * An array of test entities.
+   *
+   * @var \Drupal\entity_test\Entity\EntityTest[]
+   */
+  protected $entities;
+
+  /**
    * {@inheritdoc}
    */
   public function setUp() {
@@ -56,6 +66,7 @@ class CustomDataTypesTest extends KernelTestBase {
     $this->installSchema('search_api', array('search_api_item', 'search_api_task'));
     $this->installSchema('system', array('router'));
     $this->installSchema('user', array('users_data'));
+    $this->installEntitySchema('entity_test');
 
     // Do not use a batch for tracking the initial items after creating an
     // index when running the tests via the GUI. Otherwise, it seems Drupal's
@@ -65,20 +76,20 @@ class CustomDataTypesTest extends KernelTestBase {
     $this->installConfig(array('search_api_test_db'));
 
     // Create test entities.
-    EntityTest::create(array(
+    $this->entities[1] = EntityTest::create(array(
       'name' => 'foo bar baz föö smile' . json_decode('"\u1F601"'),
       'body' => 'test test case Case casE',
       'type' => 'item',
       'keywords' => array('Orange', 'orange', 'örange', 'Orange'),
       'category' => 'item_category'
-    ));
-    EntityTest::create(array(
+    ))->save();
+    $this->entities[2] = EntityTest::create(array(
       'name' => 'foo bar baz föö smile',
       'body' => 'test test case Case casE',
       'type' => 'item',
       'keywords' => array('strawberry', 'llama'),
       'category' => 'item_category'
-    ));
+    ))->save();
 
     // Create a test server.
     $this->server = Server::create(array(
diff --git a/tests/src/Kernel/LanguageIntegrationTest.php b/tests/src/Kernel/LanguageIntegrationTest.php
index 4049f70..f738f60 100644
--- a/tests/src/Kernel/LanguageIntegrationTest.php
+++ b/tests/src/Kernel/LanguageIntegrationTest.php
@@ -10,6 +10,7 @@ namespace Drupal\Tests\search_api\Kernel;
 use Drupal\Component\Render\FormattableMarkup;
 use Drupal\entity_test\Entity\EntityTestMul;
 use Drupal\KernelTests\KernelTestBase;
+use Drupal\language\Entity\ConfigurableLanguage;
 use Drupal\search_api\Entity\Index;
 use Drupal\search_api\Entity\Server;
 
@@ -46,7 +47,21 @@ class LanguageIntegrationTest extends KernelTestBase {
    *
    * @var string[]
    */
-  public static $modules = array('search_api', 'search_api_test_backend');
+  public static $modules = array(
+    'search_api',
+    'search_api_test_backend',
+    'language',
+    'user',
+    'system',
+    'entity_test',
+  );
+
+  /**
+   * An array of langcodes.
+   *
+   * @var string[]
+   */
+  protected $langcodes;
 
   /**
    * {@inheritdoc}
@@ -54,7 +69,25 @@ class LanguageIntegrationTest extends KernelTestBase {
   public function setUp() {
     parent::setUp();
 
+    // Enable translation for the entity_test module.
+    \Drupal::state()->set('entity_test.translation', TRUE);
+
     $this->installSchema('search_api', array('search_api_item', 'search_api_task'));
+    $this->installEntitySchema('entity_test_mul');
+
+    // Create the default languages.
+    $this->installConfig(array('language'));
+    $this->langcodes = array();
+    for ($i = 0; $i < 3; ++$i) {
+      /** @var \Drupal\language\Entity\ConfigurableLanguage $language */
+      $language = ConfigurableLanguage::create(array(
+        'id' => 'l' . $i,
+        'label' => 'language - ' . $i,
+        'weight' => $i,
+      ));
+      $this->langcodes[$i] = $language->getId();
+      $language->save();
+    }
 
     // Do not use a batch for tracking the initial items after creating an
     // index when running the tests via the GUI. Otherwise, it seems Drupal's