What to test when checking out a used machine?

First off I did a search in this forum and found nothing for this topic.

Is there a checklist of things I should look for and test when looking at a used 15" UMBP?

It was new in November (so it is probably Rev A). The guy is selling it because he bought a macbook air and he never uses this one. If I get it I will probably purchase apple care for it.

I have the serial number for it and I verified that it had not been registered with apple yet but it is a valid s/n.

Any tips are appreciated!