c# - 如何验证调用了一个方法？

Question

我有一个 ICreateService依赖于 ITicketApiAdapter 的类.我已经尝试注册一个模拟 ITicketAdaper，以便在我创建匿名创建服务时注入(inject)它。

因此，在设置中，我为票证适配器注册了这个:

Fixture.Register(() =>
    {
        var ticketApiAdapter = new Mock<ITicketApiAdapter>();
        ticketApiAdapter
            .Setup( x => x.AddTicketComment(
                It.IsAny<User>(), 
                It.IsAny<Customer>(), 
                It.IsAny<TicketComment>()))
        .Returns(new SaveResult
                        {
                            Success = true, 
                            Id = Fixture.CreateAnonymous<Guid>().ToString()
                        });

        return ticketApiAdapter;
    });

Fixture.Register(() => new CreateService(Fixture.CreateAnonymous<Mock<ITicketApiAdapter>>().Object));

根据我的理解，这应该“卡住”ICreateService和 Mock<ITicketApiAdapter>这样当我请求一个匿名实例时，它就是我注册的实例。

我有一个看起来像这样的测试:

[TestMethod]
public void CreateServiceCallsAddTicketComment()
{
    var apiTicketAdapter = Fixture.CreateAnonymous<Mock<ITicketApiAdapter>>();
    var createTicketRequest = Fixture.CreateAnonymous<CreateTicketComment>();
    var createService = Fixture.CreateAnonymous<CreateService>();

    var results = createService.CreateTicketComment(createTicketRequest);

    apiTicketAdapter
        .Verify(x => x.AddTicketComment(
            It.IsAny<User>(), 
            It.IsAny<Customer>(), 
            It.IsAny<TicketComment>()), 
        Times.Once());

    Assert.IsTrue(results.All(x => x.Success));
    Assert.IsTrue(results.All(x => x.Errors.Count == 0));

}

我希望 apiTicketAdapter 是我注册的那个，这样我就可以验证方法是否被调用。如果我单步执行，则会调用 TicketApiAdapter，但 Moq 说它不是。

编辑

这是我得到的错误:

CreateServiceCallsAddTicketComment threw exception: Moq.MockException: Expected invocation on the mock once, but was 0 times: x => x.AddTicketComment(It.IsAny(), It.IsAny(), It.IsAny())

Configured setups: x => x.AddTicketComment(It.IsAny(), It.IsAny(), It.IsAny()), Times.Never No invocations performed.

Answer 1

当您注册代码块时，每次 Fixture 实例解析所请求的类型时都会调用该代码块。这意味着它没有被卡住。如果你想卡住一些东西，Freeze overloads之一通常更易于使用。

更好的是，因为您似乎在使用 Moq，我可以建议使用 AutoMoq extension ？

这将使您能够将测试重写为如下内容:

[TestMethod]
public void CreateServiceCallsAddTicketComment(new AutoMoqCustomization());
{
    var fixture = new Fixture().Customize()
    var apiTicketAdapter = fixture.Freeze<Mock<ITicketApiAdapter>>();
    ticketApiAdapter
        .Setup( x => x.AddTicketComment(
            It.IsAny<User>(), 
            It.IsAny<Customer>(), 
            It.IsAny<TicketComment>()))
        .Returns(new SaveResult
        {
            Success = true, 
            Id = Fixture.CreateAnonymous<Guid>().ToString()
        });

    var createTicketRequest = fixture.Freeze<CreateTicketComment>();
    var createService = fixture.CreateAnonymous<CreateService>();

    var results = createService.CreateTicketComment(createTicketRequest);

    apiTicketAdapter
        .Verify(x => x.AddTicketComment(
            It.IsAny<User>(), 
            It.IsAny<Customer>(), 
            It.IsAny<TicketComment>()), 
        Times.Once());

    Assert.IsTrue(results.All(x => x.Success));
    Assert.IsTrue(results.All(x => x.Errors.Count == 0));

}

假设 CreateTicketRequest 使用构造函数注入(inject)或属性注入(inject)。