Ah, OK, in that case I'd say that breeding for sound temperament is the most important part - and I'm sure something your lot do. The testing - well, the science says nope, I'm afraid, but I'm sure it must be fun to do anyway.
Anyway, even if it did work, as soon as you start telling the new owners how the puppy scored, you have totally invalidated the test. Seriously, if you do that, there's just no point doing the test at all, sorry, except for interest's sake. Confirmation bias steps in and, woohoo, the environment changes to support what's on that piece of paper.