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如何用TDD/BDD开发输入对象?

mspec bdd tdd unit-testing

3

Byron Sommardahl · 技术社区 · 14 年前

我有一个方法叫做 ProcessPayment()

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

为了设置上下文,我正在使用Moq存根我的网关服务。

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

规格如下:

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>());

}

该方法应采用“PaymentProcessingRequest”对象(而不是域对象),将该对象映射到域对象,并将域对象传递给网关服务上的存根方法。网关服务的响应就是方法返回的响应。但是,由于我对网关服务方法的存根方式,它不关心传入的内容。因此,我似乎无法测试该方法是否正确地将请求对象映射到域对象。

我什么时候还能坚持BDD?

2 回复 | 直到 14 年前

1

2

Derek Greer 14 年前

例子:

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

2

0

Gishu 14 年前

据我所知,
您想测试WebService.ProcessPayment 方法;存在输入参数a到对象B的映射,对象B用作GateWayService协作器的输入。

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

使用最小起订量It.Is 接受谓词的约束(参数要满足的测试)。实现CheckPaymentInfo以根据预期的PaymentInfo进行断言。

e、 g.要检查Add是否作为参数传递偶数,

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