I was diagnosed by my therapist, he specializes in ASD as well as trauma (I started seeing him because of trauma related stuff). There are different types of testing that people can do and some are more extensive.

I think a lot of people get refered to specialists who do a variety of tests. But my therapist gave me a fairly straight forward test as well as asking questions about certain things - eye contact, routines, reading body language, stuff like that. So for me it wasn't a lenghty process. I asked him about this today because it seemed so simple compared to what others have done. He said that he could refer me out to further testing which would including IQ test, cognitive tests, etc and he's done that before but he's had a few clients who went and ended up with a variety of diagnoses besides autism and in most cases it just confirmed what he had determined.

Probably your first step is contact the universty and ask about a referral to someone who specializes in autism to talk to them first. And go from there.