C# – Rhino Mocks AAA Quick Start

As per this

... Put simply there is a difference between Mock and Stub objects and RhinoMocks recognizes that allowing us to write tests that better state their purpose.

Mock objects are used to define expectations i.e: In this scenario I expect method A() to be called with such and such parameters. Mocks record and verify such expectations.

Stubs, on the other hand have a different purpose: they do not record or verify expectations, but rather allow us to “replace” the behavior, state of the “fake”object in order to utilize a test scenario ...

You might want to try something out like this using the Do handler. I honestly feel ActivateFoo should be void return type. But here's the code for ActivateFoo with bool return type.

    [TestMethod]
    public void Should_update_foo_to_active_inside_of_repository()
    {
        // arrange
        var repo = MockRepository.GenerateMock<IRepository>();
        var foo = new Foo() { ID = 1, IsActive = false };
        var target = new Presenter(repo);
        repo.Expect(x => x.ActivateFoo(foo)).
            Do(new ActivateFooDelegate(ActivateFooDelegateInstance));
        // act
        target.Activate(foo);

        // assert
        Assert.IsTrue(foo.IsActive);
        repo.VerifyAllExpectations();
    }

    private delegate bool ActivateFooDelegate(Foo f);

    public bool ActivateFooDelegateInstance(Foo f)
    {
        f.IsActive = true;
        return f.IsActive;
    }