unit testing - RhinoMocks - Stub a Method That Returns a Parameter

Question

I am using RhinoMocks, I need to stub a method, and always have it return the third parameter, regardless of what is passed in:

_service.Stub(x => x.Method(parm1, parm2, parm3)).Return(parm3);

Obviously, it ain't that easy. I don't always know what the parms are going to be, but I know I always want to return the 3rd one.

question from:https://stackoverflow.com/questions/1722884/rhinomocks-stub-a-method-that-returns-a-parameter

Answer 1

You can provide an implementation for a method with the Do() handler:

Func<TypeX,TypeY,TypeZ,TypeZ> returnThird = (x,y,z) => z;
mock.Expect(x => x.Method(null, null, null)).IgnoreArguments().Do(returnThird);

Note that TypeZ appears twice because it is both an input argument type and the return type.