Being genuine is the greatest & unique gift to human beings' attitudes and behavior. And expect it from only a few. Testing someone's genuineness in an untrustable situation is the right way to validate it.
For example, if a person is diet conscious, test his/her diet genuineness by taking them to a Best Buffet and still strict with their diet food.
Diet conscious -> Genuineness
Buffet -> Untrusted circumstances
Validation -> Still strict with diet food
Reply with any other suitable examples from your thoughts, experience, and situations.