diff --git a/core/tests/Drupal/Tests/Component/Plugin/Derivative/DeriverBaseTest.php b/core/tests/Drupal/Tests/Component/Plugin/Derivative/DeriverBaseTest.php
index 716b769..45a9250 100644
--- a/core/tests/Drupal/Tests/Component/Plugin/Derivative/DeriverBaseTest.php
+++ b/core/tests/Drupal/Tests/Component/Plugin/Derivative/DeriverBaseTest.php
@@ -26,9 +26,8 @@ public function providerGetDerivativeDefinition() {
     return [
       [['id' => 'definition'], 'id'],
       [NULL, 'id'],
-      // These error out.
-      // [[], 'id'],
-      // [['foo' => 'bar'], 'baz'],
+      [[], 'id'],
+      [['foo' => 'bar'], 'baz'],
     ];
   }