Problem with my car (still). Long read, but the mystery is worth it. (1999 Chevy Cavalier)?

Alright, so I'm extending this out into the Magical Land of Semi-answers, and (possibly) smarter people. Last week the starter went out in my car. I replaced the starter, at which point the battery didn't have enough charge to turn the starter and start the engine.

Replaced the battery.

The car started and I drove Wednesday and Thursday, on the way home from school Thursday the car died, battery was run dead. Lead me to believe the Alternator was bad, removed the alternator had it tested at Advanced Auto and the Alternator was no good.

Replaced the alternator.

The battery light on the dash came on Saturday after I replaced the Alternator, I thought maybe the alternator was no good. I removed the alternator and took it to Advanced and they did a bench test. The bench test on the alternator came back fail. Was going to swap the alternator for a new one had them test the new one, it came back fail also. They checked the tester and tightened the belt, tested the new alternator again, came back pass, tested the alternator (the one I thought was no good) it also came back pass. Reinstalled the alternator and checked the voltage with a voltage meter. The voltage from the battery was just under 12.5. Within normal. The voltage coming from the Alternator is less than 1 volt. Hoping that maybe the belt was worn out and causing slippage, I replaced the serpentine belt and checked the voltage again, again the voltage on the battery was just under 12.5 and the alternator came back less than 1 volt.

I am at a complete loss, any car guru's out there have any advice? Because at this point I'm out of money to through at the car and try and fix it. Come all ye sages. Help a brotha out.