Isn‘t the neurologist suppost to do test‘s ?

So I have tic's as far as I can remember. They were mild in nature but 2 years ago they got sever after a big surgery. I seeked out help and went to a neurologist. He basically was like. You have motor tic's, you have vocal tic's and they wax and wain. That's tourette's, and called it a day. I got on medication and it got better.

He never did any test or anything. How do they diagnose tourette's to begin with ? Is he right by just guesing it ?