public function loadUserByUsername($username)
    {
        if ($username !== 'testUsername') {
            return false;
        }

        /** @var UserInterface $user */
        $user = new \stdClass();
        $user->id = 123;
        $user->username = $username;
        $user->firstName = 'aName';
        $user->lastName = 'aSurname';

        return $user;
    }