[iamNumber4]

Unit tests for code coverage or application functionality?

They are different. TDD, is a waste. As you don’t factor in protyping, you start by writing test. Tests should be always step 3. The saftey check and improve is what unit tests are for. I would even argue that unit tests should be written by someone else, later on as a way to share knowledge and checks and balances.

Ask yourself the question are we writing a testing application or a user application. When you focus on the mythical unit test perfection, you are in fact writing code to pass tests the same author devised. So the premise is flawed.