$user = new CustomEntityUser();
$user->setUsername("foo");
$user->setPassword("bar");

$entityManager->persist($user);
$entityManager->flush();

$token = new UsernamePasswordToken($user, $user->getPassword(), "main", $user->getRoles());
$this->get('security.token_storage')->setToken($token);

/**
 * {@inheritdoc}
 */
public function isEqualTo(UserInterface $user)
{
    if (! $user instanceof User) {
        return false;
    }

    if ($this->username !== $user->getUsername()) {
        return false;
    }

    if ($this->password !== $user->getPassword()) {
        return false;
    }

    return true;
}

/**
 * @var string
 *
 * @ORMColumn(name="username", type="string", length=40, unique=true)
 */
private $username;