public CustomerRegistrationTests()
{
var mapper = AutomapperConfiguration.Init();
_customerRepository = Substitute.For <ICustomerRepository>();
_creditCardGateway = Substitute.For <ICreditCardGateway>();
_mailConfirmer = Substitute.For <IMailConfirmer>();
// Default objects ('stubs')
var customer = Mocks.GetCustomer();
_vm = Mocks.GetCreateCustomerViewModel();
_creditCardGatewayResponse = Mocks.GetCreditCardGatewayResponse();
// Default system under test ('sut')
_sut = new CustomerRegistration(mapper, _customerRepository,
_mailConfirmer, _creditCardGateway);
// Default Behaviour
_customerRepository.Create(Arg.Any <Customer>()).Returns(customer);
_customerRepository.CreateRop(Arg.Any <Customer>()).Returns(Result.Ok(customer));
_customerRepository.UpgradeToPremium(Arg.Any <Customer>()).Returns(Result.Ok(customer));
_creditCardGateway.Charge(Arg.Any <string>()).Returns(_creditCardGatewayResponse);
_creditCardGateway.ChargeRop(Arg.Any <string>()).Returns(Result.Ok(_creditCardGatewayResponse));
_creditCardGateway.RollBackLastTransactionRop(Arg.Any <Customer>()).Returns(Result.Ok(customer));
_mailConfirmer.SendWelcomeRop(Arg.Any <Customer>()).Returns(Result.Ok(customer));
}
// Using Railway Oriented Programming
private CustomerCreatedViewModel RegisterCustomer5_ROP(
CreateCustomerViewModel createCustomerViewModel)
{
var result = ValidateRop(createCustomerViewModel)
.OnSuccess(c => _customerRepository.CreateRop(c))
.OnSuccess(c => createCustomerViewModel.WantsPremiumSupport
? _creditCardGateway.ChargeRop(c.CreditCardNumber)
.OnSuccess(gateway => gateway.ChargeWasBooked
? _customerRepository.UpgradeToPremium(c)
: _creditCardGateway.RollBackLastTransactionRop(c))
: Result.Ok(c))
.OnSuccess(c => _mailConfirmer.SendWelcomeRop(c))
.OnBoth(cResultAtEnd => cResultAtEnd.IsSuccess
? new CustomerCreatedViewModel(cResultAtEnd.Value.Id)
: CreateErrorResponseRop(cResultAtEnd.Error));
return(result);
}