diff -u b/core/modules/field/src/Tests/BulkDeleteTest.php b/core/modules/field/src/Tests/BulkDeleteTest.php
--- b/core/modules/field/src/Tests/BulkDeleteTest.php
+++ b/core/modules/field/src/Tests/BulkDeleteTest.php
@@ -182,7 +182,7 @@
     // The instance still exists, deleted.
     $instances = entity_load_multiple_by_properties('field_instance_config', array('field_id' => $field->uuid(), 'deleted' => TRUE, 'include_deleted' => TRUE));
     $this->assertEqual(count($instances), 1, 'There is one deleted instance');
-    $instance = $instances[$instance->uuid];
+    $instance = $instances[$instance->uuid()];
     $this->assertEqual($instance->bundle, $bundle, 'The deleted instance is for the correct bundle');
 
     // Check that the actual stored content did not change during delete.
@@ -307,14 +307,14 @@
     $this->checkHooksInvocations($hooks, $actual_hooks);
 
     // The instance still exists, deleted.
-    $instances = entity_load_multiple_by_properties('field_instance_config', array('uuid' => $instance->uuid, 'include_deleted' => TRUE));
-    $this->assertTrue(isset($instances[$instance->uuid]) && $instances[$instance->uuid]->deleted, 'The instance exists and is deleted');
+    $instances = entity_load_multiple_by_properties('field_instance_config', array('uuid' => $instance->uuid(), 'include_deleted' => TRUE));
+    $this->assertTrue(isset($instances[$instance->uuid()]) && $instances[$instance->uuid()]->deleted, 'The instance exists and is deleted');
 
     // Purge again to purge the instance.
     field_purge_batch(0);
 
     // The instance is gone.
-    $instances = entity_load_multiple_by_properties('field_instance_config', array('uuid' => $instance->uuid, 'include_deleted' => TRUE));
+    $instances = entity_load_multiple_by_properties('field_instance_config', array('uuid' => $instance->uuid(), 'include_deleted' => TRUE));
     $this->assertEqual(count($instances), 0, 'The instance is purged.');
     // The field still exists, not deleted.
     $fields = entity_load_multiple_by_properties('field_config', array('uuid' => $field->uuid(), 'include_deleted' => TRUE));
@@ -342,10 +342,10 @@
     $this->checkHooksInvocations($hooks, $actual_hooks);
 
     // The field and instance still exist, deleted.
-    $instances = entity_load_multiple_by_properties('field_instance_config', array('uuid' => $instance->uuid, 'include_deleted' => TRUE));
-    $this->assertTrue(isset($instances[$instance->uuid()]) && $instances[$instance->uuid]->deleted, 'The instance exists and is deleted');
-    $fields = entity_load_multiple_by_properties('field_config', array('uuid' => $field->uuid, 'include_deleted' => TRUE));
-    $this->assertTrue(isset($fields[$field->uuid()]) && $fields[$field->uuid]->deleted, 'The field exists and is deleted');
+    $instances = entity_load_multiple_by_properties('field_instance_config', array('uuid' => $instance->uuid(), 'include_deleted' => TRUE));
+    $this->assertTrue(isset($instances[$instance->uuid()]) && $instances[$instance->uuid()]->deleted, 'The instance exists and is deleted');
+    $fields = entity_load_multiple_by_properties('field_config', array('uuid' => $field->uuid(), 'include_deleted' => TRUE));
+    $this->assertTrue(isset($fields[$field->uuid()]) && $fields[$field->uuid()]->deleted, 'The field exists and is deleted');
 
     // Purge again to purge the instance and the field.
     field_purge_batch(0);