- Patch #1637370 by danielnolde, sun, djdevin, Berdir: Added UUID support to core entity types.

core/modules/entity/lib/Drupal/entity/Tests/EntityUUIDTest.php

+<?php
+
+/**
+ * @file
+ * Definition of Drupal\entity\Tests\EntityUUIDTest.
+ */
+
+namespace Drupal\entity\Tests;
+
+use Drupal\Component\Uuid\Uuid;
+use Drupal\simpletest\WebTestBase;
+
+/**
+ * Tests creation, saving, and loading of entity UUIDs.
+ */
+class EntityUUIDTest extends WebTestBase {
+  public static function getInfo() {
+    return array(
+      'name' => 'Entity UUIDs',
+      'description' => 'Tests creation, saving, and loading of entity UUIDs.',
+      'group' => 'Entity API',
+    );
+  }
+
+  function setUp() {
+    parent::setUp(array('entity_test'));
+  }
+
+  /**
+   * Tests UUID generation in entity CRUD operations.
+   */
+  function testCRUD() {
+    // Verify that no UUID is auto-generated when passing one for creation.
+    $uuid_service = new Uuid();
+    $uuid = $uuid_service->generate();
+    $custom_entity = entity_create('entity_test', array(
+      'name' => $this->randomName(),
+      'uuid' => $uuid,
+    ));
+    $this->assertIdentical($custom_entity->get('uuid'), $uuid);
+    // Save this entity, so we have more than one later.
+    $custom_entity->save();
+
+    // Verify that a new UUID is generated upon creating an entity.
+    $entity = entity_create('entity_test', array('name' => $this->randomName()));
+    $uuid = $entity->get('uuid');
+    $this->assertTrue($uuid);
+
+    // Verify that the new UUID is different.
+    $this->assertNotEqual($custom_entity->get('uuid'), $uuid);
+
+    // Verify that the UUID is retained upon saving.
+    $entity->save();
+    $this->assertIdentical($entity->get('uuid'), $uuid);
+
+    // Verify that the UUID is retained upon loading.
+    $entity_loaded = entity_test_load($entity->id(), TRUE);
+    $this->assertIdentical($entity_loaded->get('uuid'), $uuid);
+
+    // Verify that entity_load_by_uuid() loads the same entity.
+    $entity_loaded_by_uuid = entity_load_by_uuid('entity_test', $uuid, TRUE);
+    $this->assertIdentical($entity_loaded_by_uuid->get('uuid'), $uuid);
+    $this->assertEqual($entity_loaded_by_uuid, $entity_loaded);
+  }
+}