unit-testingmockingrhino-mocksstubbing

RhinoMocks - Stub a Method That Returns a Parameter

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.

Solution

  • 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.