I think we are discussing what it means to test a stable API or an internal API. Not just testing them in general. We're talking about making architecture decis

I think we are discussing what it means to test a stable API or an internal API. Not just testing them in general. We're talking about making architecture decisions on your code in the interest of test-ability. Regardless of the visibility of your API you will still need to unit test the logic will you not? Do you test your controllers and then the response from your service layer? Is all your logic in your actions?