Symfony2 controller test "304 - Not Modified"

AbstractFunctionalTest.php

<?php

namespace Ormigo\Tests;

use DateTime;
use DateTimeZone;

use Symfony\Bundle\FrameworkBundle\Client;
use Symfony\Component\HttpFoundation\Response;
use Symfony\Component\HttpKernel\HttpKernelInterface;

abstract class AbstractFunctionalTest extends AbstractTest
{
    // ..

    public static function assertNotModifiedResponse(Response $response)
    {
        self::assertEquals(304, $response->getStatusCode());
    }

    /**
     * Assert that the request will result in a Not-Modified response.
     *
     * @param string   $uri    The URI to request.
     * @param Client   $client The client to issue the request with.
     * @param DateTime $date   The date time to be sent as If-Modified-Since header.
     * @param string   $method The HTTP verb for the request.
     *
     * @return Response
     */
    public static function assertNotModifiedSince($uri, Client $client, DateTime $date, $method = 'GET')
    {
        $lastModified = clone $date;
        $lastModified->setTimezone(new DateTimeZone('UTC'));

        $ifModifiedSince = $date->format('D, d M Y H:i:s').' GMT';

        $client->request($method, $uri, array(), array(), array(
            'HTTP_IF_MODIFIED_SINCE' => $ifModifiedSince,
        ));
        
        $response = $client->getResponse();
        
        self::assertNotModifiedResponse($response);

        return $response;
    }
}

BankControllerTest.php

<?php

namespace Ormigo\Bundle\OrmigoBundle\Tests\Controller;

use Ormigo\Tests\AbstractFunctionalTest;

use Ormigo\Model\Banking\Bank;
use Ormigo\Model\Banking\BankQuery;

/**
 * @covers \Ormigo\Bundle\OrmigoBundle\Controller\BankController
 */
class BankControllerTest extends AbstractFunctionalTest
{
    // ..

    public function testShowNotModified()
    {
        /* @var $bank Bank */
        $bank = BankQuery::create()->findOneByBic('HYVEDEMM488');
        $uri = sprintf('/bank/%s.de_DE.json', $bank->getId());

        $this->assertNotModifiedSince($uri, static::createClient(), $bank->getVersionCreatedAt());
    }
}