I call those tests the airplane test. say you need to hire an airplane designer and you know d*ck all about aircraft design. You have two candidates both that tell you they have a new design being flow this week. So you go and watch, Candidate A's aircraft trundles down the runway and then crashes and burns. Candidate B's takes to the air and then lands. Candidate A could be a smooth talker and Candidate B could sound like a stuttering loon but B is the choice.
This is why I believe that you, the interviewer, cannot interview someone above your "experience level" without some kind of objective test.