diff --git a/core/tests/Drupal/Tests/Core/Language/LanguageUnitTest.php b/core/tests/Drupal/Tests/Core/Language/LanguageUnitTest.php
index 1ddbc42..769b977 100644
--- a/core/tests/Drupal/Tests/Core/Language/LanguageUnitTest.php
+++ b/core/tests/Drupal/Tests/Core/Language/LanguageUnitTest.php
@@ -116,56 +116,59 @@ public function providerTestSortArrayOfLanguages() {
     $language9A = new Language();
     $language9A->setName('A');
     $language9A->setWeight(9);
+    $language9A->setId('dd');
     $language10A = new Language();
     $language10A->setName('A');
     $language10A->setWeight(10);
+    $language10A->setId('ee');
     $language10B = new Language();
     $language10B->setName('B');
     $language10B->setWeight(10);
+    $language10B->setId('ff');
 
     return array(
       // Set up data, already ordered by weight.
       array(
         array(
-          $language9A,
-          $language10B,
+          [$language9A->getId()] => $language9A,
+          [$language10B->getId()] => $language10B,
         ),
         array(
-          $language9A,
-          $language10B,
+          [$language9A->getId()] => $language9A,
+          [$language10B->getId()] => $language10B,
         ),
       ),
       // Set up data, out of order by weight.
       array(
         array(
-          $language10B,
-          $language9A,
+          [$language10B->getId()] => $language10B,
+          [$language9A->getId()] => $language9A,
         ),
         array(
-          $language9A,
-          $language10B,
+          [$language9A->getId()] => $language9A,
+          [$language10B->getId()] => $language10B,
         ),
       ),
       // Set up data, tied by weight, already ordered by name.
       array(
         array(
-          $language10A,
-          $language10B,
+          [$language10A->getId()] => $language10A,
+          [$language10B->getId()] => $language10B,
         ),
         array(
-          $language10A,
-          $language10B,
+          [$language10A->getId()] => $language10A,
+          [$language10B->getId()] => $language10B,
         ),
       ),
       // Set up data, tied by weight, out of order by name.
       array(
         array(
-          $language10B,
-          $language10A,
+          [$language10B->getId()] => $language10B,
+          [$language10A->getId()] => $language10A,
         ),
         array(
-          $language10A,
-          $language10B,
+          [$language10A->getId()] => $language10A,
+          [$language10B->getId()] => $language10B,
         ),
       ),
     );