FOSUserBundle Symfony3 Simulate Authentication for Tests

I'm trying to simulate authentification for functional test using Symfony 3 framework with FOSUserBundle.

I tried this way:

// tests/AppBundle/Controller/DefaultControllerTest.php
namespace Tests\Appbundle\Controller;

use Symfony\Bundle\FrameworkBundle\Test\WebTestCase;
use Symfony\Component\BrowserKit\Cookie;
use Symfony\Component\Security\Core\Authentication\Token\UsernamePasswordToken;

class DefaultControllerTest extends WebTestCase
{
    private $client = null;

    public function setUp()
    {
        $this->client = static::createClient();
    }

    public function testSecuredHello()
    {
        $this->logIn();

        $crawler = $this->client->request('GET', '/admin');

        $this->assertTrue($this->client->getResponse()->isSuccessful());
        $this->assertGreaterThan(0, $crawler->filter('html:contains("Admin Dashboard")')->count());
    }

    private function logIn()
    {
        $session = $this->client->getContainer()->get('session');

        // the firewall context (defaults to the firewall name)
        $firewall = 'secured_area';

        $token = new UsernamePasswordToken('admin', null, $firewall, array('ROLE_ADMIN'));
        $session->set('_security_'.$firewall, serialize($token));
        $session->save();

        $cookie = new Cookie($session->getName(), $session->getId());
        $this->client->getCookieJar()->set($cookie);
    }
}

And this way also:

$client = static::createClient(array(), array(
    'PHP_AUTH_USER' => 'username',
    'PHP_AUTH_PW'   => 'pa$$word',
));

Both examples doesn't work for me.

Any advice appriciated.