I agree that experimentation and brainstorming are not the time to be messing with unit tests. Specs maybe. I've been frustrated enough with failing tests to oc

I agree that experimentation and brainstorming are not the time to be messing with unit tests. Specs maybe. I've been frustrated enough with failing tests to occasionally lose them. But, when it comes to something I expect someone else to use, there is no question that I will start with a test.