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vendor/symfony/twig-bundle/Tests/DependencyInjection/Compiler/ExtensionPassTest.php

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+<?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\Bundle\TwigBundle\Tests\DependencyInjection\Compiler;
+
+use PHPUnit\Framework\TestCase;
+use Symfony\Bundle\TwigBundle\DependencyInjection\Compiler\ExtensionPass;
+use Symfony\Component\DependencyInjection\ContainerBuilder;
+use Symfony\Component\DependencyInjection\Definition;
+
+class ExtensionPassTest extends TestCase
+{
+    public function testProcessDoesNotDropExistingFileLoaderMethodCalls()
+    {
+        $container = new ContainerBuilder();
+        $container->setParameter('kernel.debug', false);
+        $container->setParameter('kernel.root_dir', __DIR__);
+
+        $container->register('twig.app_variable', '\Symfony\Bridge\Twig\AppVariable');
+        $container->register('templating', '\Symfony\Bundle\TwigBundle\TwigEngine');
+        $container->register('twig.extension.yaml');
+        $container->register('twig.extension.debug.stopwatch');
+        $container->register('twig.extension.expression');
+
+        $nativeTwigLoader = new Definition('\Twig\Loader\FilesystemLoader');
+        $nativeTwigLoader->addMethodCall('addPath', array());
+        $container->setDefinition('twig.loader.native_filesystem', $nativeTwigLoader);
+
+        $filesystemLoader = new Definition('\Symfony\Bundle\TwigBundle\Loader\FilesystemLoader');
+        $filesystemLoader->setArguments(array(null, null, null));
+        $filesystemLoader->addMethodCall('addPath', array());
+        $container->setDefinition('twig.loader.filesystem', $filesystemLoader);
+
+        $extensionPass = new ExtensionPass();
+        $extensionPass->process($container);
+
+        $this->assertCount(2, $filesystemLoader->getMethodCalls());
+    }
+}