is it possible to mock/fake an extension method?

Question

I\'m using a controller extension, and I tried to mock it using FakeItEasy (v 1.7.4) like this:

A.CallTo(() => controller.RenderView(A.Ignor         


        

Answer 1

This is not possible. Proxying/intercepting libraries used by FakeItEasy (and other popular free frameworks, like Moq or RhinoMocks) don't allow interception of static methods (static properties, sealed classes and non-virtual instance methods in fact). And extension method is just a kind of static method.

You can take a look at TypeMock or JustMock, which do have such functionality.

Answer 2

If the extension method is declared in a separate assembly, you could link in a replacement assembly with the same namespace.

You'd have to replace any other required types from this assembly too, though.

Answer 3

In FakeItEasy you can create it as a strict mock and then configure the static method

http://hocke.blogspot.com.ar/2011/03/extension-method-for-creating-strict.html