Unit test for a method that takes a HttpResponse object as a parameter. OutputStream is not available

Question

I am trying to create a unit test for a method that takes a HttpResponse object as a parameter. What the correct way of doing this? I hope you seasoned unit testers out there can help me.

Additional information: I tried creating a fake HttpResponse object by passing in a StringWriter.

StringBuilder sb = new StringBuilder();
StringWriter sw = new StringWriter(sb);
HttpResponse response = new HttpResponse(sw);
RssGenerator.Generate(response, otherParameters);

The test fails with the message: System.Web.HttpException: OutputStream is not available when a custom TextWriter is used. The method being tested is part of a class library dll. It uses the Response object's OutputStream to create an RSSFeed with an XMLWriter.

Answer 1

Need to use namespace System.Web.Abstractions

In particular, take a HttpResponseBase (http://msdn.microsoft.com/en-us/library/system.web.httpresponsebase.aspx) as an input parameter instead of HttpResponse. Then you can mock the HttpResponseBase from your tests. When you have a real HttpResponse to pass in, use HttpResponseWrapper to produce a HttpResponseBase.