diff --git a/core/tests/Drupal/Tests/Core/Template/AttributeTest.php b/core/tests/Drupal/Tests/Core/Template/AttributeTest.php
index 249b79f..784d715 100644
--- a/core/tests/Drupal/Tests/Core/Template/AttributeTest.php
+++ b/core/tests/Drupal/Tests/Core/Template/AttributeTest.php
@@ -97,7 +97,6 @@ public function testRemoveAttribute() {
       'style' => 'color: pink;',
       'title' => 'kitten',
       'value' => 'ostrich',
-      'checked' => TRUE,
     );
     $attribute = new Attribute($attributes);
 
@@ -119,6 +118,9 @@ public function testRemoveAttribute() {
     $this->assertEmpty((string) $attribute);
 
     // Boolean value.
+    $attribute = new Attribute();
+    $attribute->setAttribute('checked', TRUE);
+    $this->assertTrue($attribute['checked']->value());
     $attribute->removeAttribute('checked');
     $this->assertEmpty($attribute['checked']);
   }