Update to Drupal 8.1.0. For more information, see https://www.drupal.org/drupal-8.1.0-release-notes

core/modules/rest/src/Tests/CsrfTest.php

@@ -1,8 +1,4 @@
 <?php
-/**
- * @file
- * Contains \Drupal\rest\Tests\CsrfTest.
- */
 
 namespace Drupal\rest\Tests;
 
@@ -54,7 +50,9 @@ class CsrfTest extends RESTTestBase {
     // request.
     $serializer = $this->container->get('serializer');
     $entity_values = $this->entityValues($this->testEntityType);
-    $entity = entity_create($this->testEntityType, $entity_values);
+    $entity = $this->container->get('entity_type.manager')
+      ->getStorage($this->testEntityType)
+      ->create($entity_values);
     $this->serialized = $serializer->serialize($entity, $this->defaultFormat);
   }