RhinoMocks - Stub a Method That Returns a Parameter

unit-testing mocking rhino-mocks stubbing
Martin picture Martin · Nov 12, 2009 · Viewed 17.6k times · Source

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.

Answer

Wim Coenen picture Wim Coenen · Nov 13, 2009

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.

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