From past experience, they haven't ever tested my controllers when I traded them in. I've traded in my old Dualshock 3s that died without issues.
In fact, I don't think I've ever seen them do hardware tests. I traded in my PS4 to upgrade to a Pro and they didn't even bother messing with my system before accepting it.
In fact, I don't think I've ever seen them do hardware tests. I traded in my PS4 to upgrade to a Pro and they didn't even bother messing with my system before accepting it.