class AuthenticationService {
  Future<bool> verifyTwoFactorCode(String code) async {
    await Future.delayed(const Duration(seconds: 2));

    if (code == '000000') {
      return true;
    } else {
      throw const WrongCodeException();
    }
  }
}

class WrongCodeException implements Exception {
  const WrongCodeException();

  @override
  String toString() => 'WrongCodeException';
}