Dan, just to clarify, the guy pushing is pushing on your hands specifically or are they allowed to push on your chest? If I read this correctly (that they're pushing on your extended straight arms) then you're basically at the out phase of a push-out, while the tester is allowed to be in a more supported 'stronger' stance. Correct?
The pushout is a great test and training device. We meant to use it as a quick warmup during Saturdays class and were still geeking out on it thirty minutes later...
Not Dan, but will give an answer. Yes. That pushout exercise is with arms extended straight out, locked, pushing on extended arms, not chest.
One of the interesting things that we'll do is that both people are at full arms length and you can't collapse the arms. Everything is done from there.