嘲笑通过其他对象的构造函数附加到抽象类的事件

Question

我有一个抽象类，我试图用Rhino Mocks模拟出附加到它的事件。这里抽象类的一点

public abstract class Download 
{ 

    public virtual event EventHandler<DownloadProgressEventArgs> DownloadProgress_Changed; 

    protected virtual void OnDownloadProgressChanged(DownloadProgressEventargs e) 
    { 
     if(DownloadProgress_Changed != null) 
     { 
      DownloadProgress_Changed(this, e); 
     } 

    } 

    // abstract method declarations etc 
} 

我把事件标记为虚拟的，以便它可以被模拟。

在我的应用程序下载被送入DownloadEntity的构造函数中，constructore下载了它的事件挂接内，如下

public class DownloadEntity 
{ 
    private Download _download; 

    public DownloadEntity(Download download) 
    { 
     _download = download; 
     _download.DownloadProgressChanged += new EventHandler<DownloadProgressEventArgs>(download_DownloadProgressChanged); 

    } 

    public virtual void download_DownloadProgressChanged(object sender, DownloadProgressEventArgs e) 
    { 
    // stuff done here 
    } 

// other code and stuff in the class 

}

所以，这是非常straightforwards，我想模拟出的下载和使用DownloadEntity验证事件附加，为了这个，我已经使用了流畅的犀牛嘲笑语法如下

[Test] 
    public void DownloadAttachesEventsWhenCreated() 
    { 
     MockRepository mocks = new MockRepository(); 
     Download dl = mocks.DynamicMock<Download>(); 
     DownloadEntity dle; 
     With.Mocks(mocks).Expecting(delegate 
     { 
      dl.DownloadProgressChanged += new EventHandler<DownloadProgressEventArgs>(DummyHandler); 
     }) 
     .Verify(delegate 
     { 
      // verify it is called by creating a new DownloadEntity and injecting the mock 
      dle = new DownloadEntity(dl); 
     }); 

    } 

    void DummyHandler(object sender, DownloadProgressEventArgs e) 
    { 
     throw new NotImplementedException(); 
    } 

即使当我浏览代码时，我也会看到该处理程序已附加到Mocked下载。这让我真的陷入了困境，我不能帮助，但我想在这里失去一些真正明显的东西。

谢谢！

Answer 1

我正在使用Rhino Mocks 3.5，这就是我必须做的所有事情，以正确测试事件绑定的功能。

[Test] 
public void Download_attaches_events_when_created() 
{ 
    // Arrange 
    var download = MockRepository.GenerateMock<Download>(); 

    // Act 
    var downloadEntity = new DownloadEntity(download); 

    // Assert 
    download.AssertWasCalled(x => x.DownloadProgress_Changed += Arg<EventHandler<DownloadProgressEventArgs>>.Is.Anything); 
} 

如果您不使用3.5或更高版本，并且您可以升级，我会考虑它使您的测试更简单。