gistfile1.txt

    protected function loginAs(User $user)
    {
        $qCodoUser = \User::Load($user->getUserId(), true);
        \UserSecurity::Login($qCodoUser, false);

        $this->user = $user;
    }

    protected function loginAsUsername($username)
    {
        $user = $this->get('user.user_manager')->findUserByUsername($username);
        $this->loginAs($user);
    }