security:

    # http://symfony.com/doc/current/security.html#b-configuring-how-users-are-loaded
    providers:
        in_memory:
            memory: ~
        bd_provider:
            entity:
                class: AppBundle:Usuario
                property: email

    firewalls:
        # disables authentication for assets and the profiler, adapt it according to your needs
        dev:
            pattern: ^/(_(profiler|wdt)|css|images|js)/
            security: false

        main:
            anonymous: ~

            form_login:
                login_path: login
                check_path: login

            provider: bd_provider

            logout:
                path:   /logout
                target: /login

protected function createClientWithAuthentication()
{
    /* @var $client Client */
    $client = static::createClient();

    /* @var $user UserInterface */
    $user = $client->getContainer()->get('doctrine')->getRepository('AppBundle:Usuario')->find(5);

    $firewallName = 'main';
    $token = new UsernamePasswordToken($user, $user->getPassword(), $firewallName, $user->getRoles());
    $session = $client->getContainer()->get('session');
    $session->set('_security_' . $firewallName, serialize($token));
    $session->save();

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

    return $client;
}

security:
    providers:
        em_memoria:
            memory:
                users:
                    email@example.com:
                        password: senha
                        roles: 'ROLE_SUPER_ADMIN'

    encoders:
            AppBundleEntityUsuario: plaintext

    firewalls:
        main:
            provider: em_memoria

$user = new AppBundleUsuario();
$user
    ->setUsername('email@example.com')
    ->setPassword('admin')
    ->setRole('ROLE_USER_ADMIN');