Mocking a method that returns a sealed class in RhinoMocks

Question

Running this code:

_foo = MockRepository.GenerateStub<IBar>();
_foo.Stub(x => x.Foo()).Return("sdf");

When

public interface IBar
{
   string Foo();
}

public class Bar : IBar
{
   public string Foo()
   {
      throw new NotImplementedException();
   }
}

throws NotSupportedException - "Can't create mocks of sealed classes". I understand why you can't mock a sealed class (although there are solutions in TypeMock), but what's the problem with mocking a class that returns a sealed class (string) ?

Answer 1

Your code works properly. You likely have some other code not shown which is causing the problem. Post your whole unit test here and we'll diagnose the issue for you.