public function testRegistration()
{
    $client = static::createClient();

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

    $buttonCrawlerNode = $crawler->selectButton("Create my account");

    $form = $buttonCrawlerNode->form(array(
        'user[username]'         => 'Coco',
        'user[email]'            => 'email@test.com',
        'user[password][pass]'   => 'pass',
        'user[password][pass2]'  => 'pass',
        'user[captcha]'          =>  '?',
    ));

    $submitCrawler = $client->submit($form);

    $this->assertTrue($submitCrawler->filter('html:contains("Welcome")')->count() > 0);
}