DoctrineCacheBundle/Tests/FunctionalTestCase.php

<?php
namespace Doctrine\Bundle\DoctrineCacheBundle\Tests;

use Symfony\Component\Config\FileLocator;
use Symfony\Component\DependencyInjection\ContainerBuilder;
use Symfony\Component\DependencyInjection\Loader\XmlFileLoader;
use Doctrine\Bundle\DoctrineCacheBundle\DependencyInjection\DoctrineCacheExtension;

class FunctionalTestCase extends TestCase
{
    /**
     * @param \Symfony\Component\DependencyInjection\ContainerBuilder $container
     *
     * @param type $file
     */
    protected function loadFromFile(ContainerBuilder $container, $file)
    {
        $loader = new XmlFileLoader($container, new FileLocator(__DIR__.'/Functional/Fixtures/config'));

        $loader->load($file . '.xml');
    }

    /**
     * @param string $file
     * @param \Symfony\Component\DependencyInjection\ContainerBuilder $container
     *
     * @return \Symfony\Component\DependencyInjection\ContainerBuilder
     */
    protected function compileContainer($file, ContainerBuilder $container = null)
    {
        $container = $container ?: $this->createContainer();
        $loader    = new DoctrineCacheExtension();

        $container->registerExtension($loader);
        $this->loadFromFile($container, $file);
        $this->overrideContainer($container);
        $container->compile();

        return $container;
    }

    /**
     * Override this hook in your functional TestCase to customize the container
     *
     * @param ContainerBuilder $container
     */
    protected function overrideContainer(ContainerBuilder $container)
    {
    }
}