A module I'd like to give a 5 stars rating but it is so completely illogical (to me).
I'm fine with everything except that the stubbing work is done in the wrong place. If I have a module with a few subs, I don't want to modify or add code so it is easy for someone else to transform my subs into stubs.
This is obviously thought as a mechanism to hep test your own module. But what if someone else want to stub a sub I didn't think about?.