The best way to tell if the cv joint is shot would be to jack the car up and get underneath, hold the driveshaft cup still with one hand and rock the wheel back and forth with the other hand. There should be no play in between turning the wheel and the cv joint moving, if there is, you've found the broken joint.
I'm 99.9% sure this is your issue (been a vag technician for 8 years).
