Update to drupal 8.0.0-rc1. For more information, see https://www.drupal.org/node/2582663

vendor/symfony/http-kernel/Tests/DependencyInjection/LazyLoadingFragmentHandlerTest.php

@@ -0,0 +1,40 @@
+<?php
+
+/*
+ * This file is part of the Symfony package.
+ *
+ * (c) Fabien Potencier <fabien@symfony.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace Symfony\Component\HttpKernel\Tests\DependencyInjection;
+
+use Symfony\Component\HttpKernel\DependencyInjection\LazyLoadingFragmentHandler;
+use Symfony\Component\HttpFoundation\Request;
+use Symfony\Component\HttpFoundation\Response;
+
+class LazyLoadingFragmentHandlerTest extends \PHPUnit_Framework_TestCase
+{
+    public function test()
+    {
+        $renderer = $this->getMock('Symfony\Component\HttpKernel\Fragment\FragmentRendererInterface');
+        $renderer->expects($this->once())->method('getName')->will($this->returnValue('foo'));
+        $renderer->expects($this->any())->method('render')->will($this->returnValue(new Response()));
+
+        $requestStack = $this->getMock('Symfony\Component\HttpFoundation\RequestStack');
+        $requestStack->expects($this->any())->method('getCurrentRequest')->will($this->returnValue(Request::create('/')));
+
+        $container = $this->getMock('Symfony\Component\DependencyInjection\ContainerInterface');
+        $container->expects($this->once())->method('get')->will($this->returnValue($renderer));
+
+        $handler = new LazyLoadingFragmentHandler($container, false, $requestStack);
+        $handler->addRendererService('foo', 'foo');
+
+        $handler->render('/foo', 'foo');
+
+        // second call should not lazy-load anymore (see once() above on the get() method)
+        $handler->render('/foo', 'foo');
+    }
+}