I don't think TDD actually makes that distinction. As long as you have a test and you write test before you write production code, you are doing TDD. It's actu

I don't think TDD actually makes that distinction. As long as you have a test and you write test before you write production code, you are doing TDD. It's actually very comubersome to do pure unit test when you have multiple layers involved, as opposed to a plain textbook algorithm design where unit test is trivial.