How to create an input object using TDD / BDD?

Question

I have a method called ProcessPayment()that I am developing through BDD and mspec. I need help with a new task. My user story reads:

Given a payment processing context,
When payment is processed with valid payment information,
Then it should return a successful gateway response code.

To set up the context, I end my gateway service with Moq.

_mockGatewayService = Mock<IGatewayService>();
_mockGatewayService.Setup(x => x.Process(Moq.It.IsAny<PaymentInfo>()).Returns(100);

Here spec:

public class when_payment_is_processed_with_valid_information {

    static WebService _webService;
    static int _responseCode;
    static Mock<IGatewayService> _mockGatewayService;
    static PaymentProcessingRequest _paymentProcessingRequest;

    Establish a_payment_processing_context = () => {

        _mockGatewayService = Mock<IGatewayService>();
        _mockGatewayService
            .Setup(x => x.Process(Moq.It.IsAny<PaymentInfo>())
            .Returns(100);

        _webService = new WebService(_mockGatewayService.Object);

        _paymentProcessingRequest = new PaymentProcessingRequest();
    };

    Because payment_is_processed_with_valid_payment_information = () => 
        _responseCode = _webService.ProcessPayment(_paymentProcessingRequest); 

    It should_return_a_successful_gateway_response_code = () => 
        _responseCode.ShouldEqual(100);

    It should_hit_the_gateway_to_process_the_payment = () => 
        _mockGatewayService.Verify(x => x.Process(Moq.It.IsAny<PaymentInfo>());

}

The method should take the object "PaymentProcessingRequest" (and not the obj domain), map the obj object to the obj domain and transfer the obj domain to the trimmed method in the gateway service. The response from the gateway service is what is returned by the method. However, due to the fact that I take into account my method of servicing the gateway, it does not matter what is passed to it. As a result, it seems that I have no way to check whether the method maps the request object to the domain object correctly.

When can I do this and still stick to BDD?

Answer 1

, , IGatewayService, , . .

:

_mockGatewayService
            .Setup(x => x.Process(Moq.It.IsAny<PaymentInfo>())
            .Callback<PaymentInfo>(paymentInfo => _paymentInfo = paymentInfo);

Answer 2

, , ,
WebService.ProcessPayment; A B, GateWayService.

It should_hit_the_gateway_to_process_the_payment = () => 
        _mockGatewayService.Verify(
             x => x.Process( Moq.It.Is<PaymentInfo>( info => CheckPaymentInfo(info) ));

Moq It.Is, ( , ). CheckPaymentInfo PaymentInfo.

. , "" ,

 mock.Setup(foo => foo.Add(It.Is<int>(i => i % 2 == 0))).Returns(true);