问题
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<string>.Ignored,A<object>.Ignored,null)).Returns("");
but I get this error:
System.NullReferenceException : Object reference not set to an instance of an object.
at System.Object.GetType()
at FakeItEasy.Creation.ProxyGeneratorSelector.MethodCanBeInterceptedOnInstance(MethodInfo method, Object callTarget, ref String failReason)
at FakeItEasy.Configuration.DefaultInterceptionAsserter.AssertThatMethodCanBeInterceptedOnInstance(MethodInfo method, Object callTarget)
at FakeItEasy.Configuration.FakeConfigurationManager.CallTo(Expression`1 callSpecification)
回答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.
回答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.
回答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
来源:https://stackoverflow.com/questions/9064566/is-it-possible-to-mock-fake-an-extension-method