*shrug* I'm too focused on developing my own abilities to really worry about anyone else's. (Except when I'm the person teaching the class.)
As for testing a potential teacher, I've been fortunate enough to study with teachers who are well beyond my ability to actually test them. If you don't feel that testing your teacher would be pointless, perhaps it's time to find another teacher.
Way off the mark here, sorry. I am very happy with my mentor and guide thank you kindly. It was meant for helping someone to find find a good teacher not test the one you already have and hopefully enjoy.