diff -u b/core/modules/system/src/Tests/Entity/ValidReferenceConstraintValidatorTest.php b/core/modules/system/src/Tests/Entity/ValidReferenceConstraintValidatorTest.php
--- b/core/modules/system/src/Tests/Entity/ValidReferenceConstraintValidatorTest.php
+++ b/core/modules/system/src/Tests/Entity/ValidReferenceConstraintValidatorTest.php
@@ -2,14 +2,13 @@
 
 /**
  * @file
- * Contains \Drupal\system\Tests\Entity\EntityTypeConstraintValidatorTest.
+ * Contains \Drupal\system\Tests\Entity\ValidReferenceConstraintValidatorTest.
  */
 
 namespace Drupal\system\Tests\Entity;
 
-use Drupal\system\Tests\Entity\EntityUnitTestBase;
-use Drupal\system\Tests\TypedData;
 use Drupal\Core\Field\BaseFieldDefinition;
+use Drupal\system\Tests\TypedData;
 
 /**
  * Tests validation constraints for ValidReferenceConstraintValidator.
@@ -25,6 +24,9 @@
    */
   protected $typedData;
 
+  /**
+   * {@inheritdoc}
+   */
   public static $modules = array('field', 'user');
 
   /**
@@ -48,7 +50,7 @@
 
     $typed_data = $this->typedData->create($definition, array('target_id' => $entity->id()));
     $violations = $typed_data->validate();
-    $this->assertEqual($violations->count(), 0, 'Validation passed for correct value.');
+    $this->assertFalse($violations->count(), 'Validation passed for correct value.');
 
     // NULL is also considered a valid reference.
     $typed_data = $this->typedData->create($definition, array('target_id' => NULL));
@@ -63,7 +65,10 @@
 
     // Make sure the information provided by a violation is correct.
     $violation = $violations[0];
-    $this->assertEqual($violation->getMessage(), t('The referenced entity (%type: %id) does not exist.', array('%type' => 'user', '%id' => $entity->id())), 'The message for invalid value is correct.');
+    $this->assertEqual($violation->getMessage(), t('The referenced entity (%type: %id) does not exist.', array(
+      '%type' => 'user',
+      '%id' => $entity->id(),
+    )), 'The message for invalid value is correct.');
     $this->assertEqual($violation->getRoot(), $typed_data, 'Violation root is correct.');
   }
 }