My sons were diagnosed last year but they were only 6 and 8. I'm not sure about older children/adult assessments. Sorry, I'm not sure how old you are!
I had to fill out questionairres and so did their teachers. They also had IQ tests. Then my sons spent a couple of hours with the psychologist. She asked them lots of questions about their interests. She through in quite a few statements that they interpreted literally.
Also, she showed them lots of photos and asked them to describe what was happening in the photo. She also showed photos of facial expressions and asked them what the person was feeling.
Helen