Mocking a method call generically

Question

Suppose I have a strongly typed caching interface that I want to mock. It takes objects of any kind and returns them, like this:

interface IMyCache
{
   void Add( int key, object obj );
   T Get<T>(int key);
}

Can I write a RhinoMocks stub that will mock any parameter type that I send to it? Ideally it would just look something like this:

var mock = MockRepository.GenerateStub<IMyCache>();
mock.Stub( m => m.Get<T>(1234)).Return( new T());

This doesn't work because it's expecting T to be a concrete class, but I'd like to genericize it. Is this possible?

Answer 1

I don't think you can. When writing tests with rhino mocks, you need to follow the rules of the compiler, and avoiding to specify the generic type T, makes the compiler unhappy.

If you need to reuse that stub-code between multiple tests, each using different types for T, you can make a helper method as proposed here: Rhino Mocks: How to stub a generic method to catch an anonymous type?