How can you unit test an Action Filter in ASP.NET Web Api?

Question

I was looking to add an Action Filter to my service to handle adding link data to the response message. I have found that I need to mock HttpActionExecutedContext but it\'s

Answer 1

I've been banging my head against a brick wall over this also. I tried contextUtil but kept getting a null reference exception. I found out how to call an actionFilter in this post N.B. The actionFilter wasn't being invoked when using a Mock instance of the filter, I had to use the real object. HTH

Specifically:

var httpActionContext = new HttpActionContext
{
    ControllerContext = new HttpControllerContext
    {
        Request = requestMessage
    }
};

//call filter
var filter = new FooFilter();
filter.OnActionExecuting(httpActionContext);