[eikenberry]

IMO this style isn't at odds with the spirit of TDD. TDD is mainly a technique to teach people about loose coupling and designing for maintenance. The main takeaway has always been that you should be able to run/exercise your code at every step and that you should use code to do that. No matter if it's an API or the whole program, that code you use to exercise it is what is key as it not only exercises the code it also helps you understand the problem.