Comment by UncleEntity

Yeah, if you can somehow convince them you really, really want them to follow the specification and not just do whatever they want.

And is doesn't matter how many times you tell them the implementation and, more importantly, the tests needs to 100% follow the spec they'll still write tests to match the buggy code or just ignore bugs completely until you call them out on it and/or watch them like a hawk.

Maybe I'm just holding it wrong, who knows?