diff -u b/core/tests/Drupal/Tests/Core/Render/Element/WeightTest.php b/core/tests/Drupal/Tests/Core/Render/Element/WeightTest.php
--- b/core/tests/Drupal/Tests/Core/Render/Element/WeightTest.php
+++ b/core/tests/Drupal/Tests/Core/Render/Element/WeightTest.php
@@ -4,13 +4,13 @@
 
 use Drupal\Core\Form\FormState;
 use Drupal\Core\Render\Element\Weight;
-use Drupal\Tests\UnitTestCase;
+use Drupal\Tests\token\Kernel\KernelTestBase;
 
 /**
  * @coversDefaultClass \Drupal\Core\Render\Element\Weight
  * @group Render
  */
-class WeightTest extends UnitTestCase {
+class WeightTest extends KernelTestBase {
 
   /**
    * Test existing #default_value value in #options list.