What tests? The Allegro examples? They all worked, except the ones for hardware I don't have (such as dual monitors). There was also some resizing thing that didn't work right a couple of years ago, I don't think it's fixed yet.
I don't think I tried them all because it's so tedious, there were a couple of GLSL examples I just ran a few days ago and I'm pretty sure I'd never seen them before (they worked correctly too).
I always get rid of the noveau (?) open source driver and install the Nvidia proprietary driver because the noveau driver sucks so hard, for example, the ex_gldepth example doesn't work right with it. OTOH, about a year ago I reported a problem and spent about three days trying to fix it when I saw a new Nvidia driver had come out and it worked correctly then. Shit happens.