Trying to write code on a whiteboard is not the same as communicating with peers via a whiteboard. I've never written or seen written anything more code-like t

Trying to write code on a whiteboard is not the same as communicating with peers via a whiteboard. I've never written or seen written anything more code-like than function prototypes on a whiteboard outside an interview session. Design and flows get thrown on whiteboards a lot, but those are not code, and their creation is not remotely like coding. You are "testing" exactly the wrong thing.