A simple base WebTestCase class

WebTestCase.php

<?php

namespace ...\Bundle\MyBuyndle\Tests;

use Symfony\Bundle\FrameworkBundle\Test\WebTestCase as BaseWebTestCase;
use Symfony\Component\HttpFoundation\Response;

/**
 * @author Tyler Stroud <tyler@tylerstroud.com>
 */
class WebTestCase extends BaseWebTestCase
{
    /**
     * @var \Symfony\Bundle\FrameworkBundle\Client
     */
    protected $client;

    protected $debug = false;

    public function setUp()
    {
        $this->client = static::createClient(['debug' => $this->debug]);
        $container = $this->client->getContainer();
        $container
            ->get('doctrine.odm.mongodb.document_manager')
            ->getEventManager()
            ->addEventListener(
                ['loadClassMetadata'],
                new ChangeDatabaseEventListener($container->getParameter('my.mongodb.database'))
            );
    }

    public function tearDown()
    {
        $container = $this->client->getContainer();
        $dm = $container->get('doctrine.odm.mongodb.document_manager');
        $collections = $dm->getConnection()
            ->selectDatabase($container->getParameter('my.mongodb.database'))->listCollections();
        foreach ($collections as $collection) {
            $collection->drop();
        }

        $refl = new \ReflectionObject($this);
        foreach ($refl->getProperties() as $prop) {
            if (!$prop->isStatic() && 0 !== strpos($prop->getDeclaringClass()->getName(), 'PHPUnit_')) {
                $prop->setAccessible(true);
                $prop->setValue($this, null);
            }
        }
    }
}

Where did you get ChangeDatabaseEventListener ?