diff --git a/core/tests/Drupal/Tests/Component/Utility/JsonTest.php b/core/tests/Drupal/Tests/Core/Serialization/JsonTest.php
similarity index 98%
rename from core/tests/Drupal/Tests/Component/Utility/JsonTest.php
rename to core/tests/Drupal/Tests/Core/Serialization/JsonTest.php
index 9acea78..dcc8951 100644
--- a/core/tests/Drupal/Tests/Component/Utility/JsonTest.php
+++ b/core/tests/Drupal/Tests/Core/Serialization/JsonTest.php
@@ -5,7 +5,7 @@
  * Contains \Drupal\Tests\Core\Serialization\JsonTest.
  */
 
-namespace Drupal\Tests\Component\Utility;
+namespace Drupal\Tests\Core\Serialization;
 
 use Drupal\Core\Serialization\Json;
 use Drupal\Tests\UnitTestCase;