c# - 使用 Moq 验证事件注册

Question

我正在开发一个试图实现 MVP 模式的 asp.net(经典)应用程序 using this example .在尝试对我的演示者进行单元测试并使用以下模式时，伪代码看起来像这样

//base view interface
public interface IView
{
    event EventHandler Init;

    event EventHandler Load;

    bool IsPostBack { get; }

    void DataBind();

    bool IsValid { get;}
}

//presenter psuedo code
public class SomePresenter
{
     public SomePresenter(ISomeDomainService service, IView someView)
     {
           ...
           //HOW DO WE TEST/VERIFY THAT THIS REGISTRATION OCCURS?
           someView.Init += OnInit;
           someView.Load += OnLoad;
     }
}
...
//consuming code that exercises the above code, that needs to be tested
var presenter = new SomePresenter(someDomainService, someView);

我如何验证演示者正在做预期的事情，即注册 Init 和 Load 事件？虽然这在 Phil Haack's example 中很容易完成使用 Rhino 模拟...

[Test]
public void VerifyAttachesToViewEvents()
{
    viewMock.Load += null;
    LastCall.IgnoreArguments();
    viewMock.PostSaved += null;
    LastCall.IgnoreArguments();
    mocks.ReplayAll();
    new PostEditController(viewMock, 
      this.dataServiceMock);
    mocks.VerifyAll();
}

...我们如何使用最小起订量来做到这一点？

Answer 1

moq 4.13 引入了此功能。现在可以验证 add\remove 是否已被调用。因此引入了四种新方法:

1. 设置添加
2. SetupRemove
3. 验证添加
4. 验证移除

示例

var mock = new Mock<IAdder<EventArgs>>();
mock.SetupAdd(m => m.Added += (sender, args) => { });

mock.Object.Added += (sender, args) => { };
mock.Object.Added += (sender, args) => { };

mock.VerifyAdd(m => m.Added += It.IsAny<EventHandler>(), Times.Exactly(2));

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注意:请注意，为了验证至少应添加一个设置。原因是为了保持与旧版本 moq 的向后兼容性。