我怎么能嘲笑ELMAH的日常ErrorSignal？ [英] How can I mock Elmah's ErrorSignal routine?

问题描述

我们正在使用ELMAH来处理我们的ASP.Net MVC C＃应用程序，并在我们捕获的异常错误，我们正在做这样的事情：

We're using ELMAH for handling errors in our ASP.Net MVC c# application and in our caught exceptions, we're doing something like this:

ErrorSignal.FromCurrentContext().Raise(exception);

但是当我试图单元测试捕获的异常，我得到这个消息：

but when I try to unit test the caught exceptions, I get this message:

System.ArgumentNullException: Value cannot be null.
Parameter name: context

我怎么能嘲笑FromCurrentContext（）调用？
是否有别的我应该做的呢？事情

How can I mock the FromCurrentContext() call? Is there something else I should be doing instead?

FYI ...我们目前正在使用的起订量和RhinoMocks的。

FYI... We're currently using Moq and RhinoMocks.

谢谢！

推荐答案

由于 FromCurrentContext（）的方法是，你不能简单地模拟调用它的静态方法。你有其他两个选项。

Since the FromCurrentContext() method is a static method you can't simply mock the call to it. You do have two other options.

1. 由于 FromCurrentContext（）内部使得以 HttpContext.Current 呼叫你可以把假的背景在那里面。例如：

1. Since FromCurrentContext() internally makes a call to HttpContext.Current you can push a fake context in that. For example:

SimpleWorkerRequest request = new SimpleWorkerRequest(
    "/blah", @"c:\inetpub\wwwroot\blah", "blah.html", null, new StringWriter());

HttpContext.Current= new HttpContext(request);

通过这一点，不应该抛出异常了，因为 HttpContext.Current 不为null。

With this it should not throw the exception anymore since HttpContext.Current is not null.

创建呼叫周围的包装类，以提高，只是模拟出的包装类。

Create a wrapper class around the call to Raise and just mock out the wrapper class.

public class ErrorSignaler {

    public virtual void SignalFromCurrentContext(Exception e) {
        if (HttpContext.Current != null)
            Elmah.ErrorSignal.FromCurrentContext().Raise(e);
    } 
}

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