Every training aircraft has a legal requirement to recover after one revolution of a spin otherwise it won't get a CoA. I have heard of guys spinning warriors but IMHO it's rather foolhardy as there are no CoG guidelines owing to the fact it isn't rated for spinning. They never tested it beyond the one revolution during testing so you have to ask yourself why they didn't go further. It might be all safe and sound but then again.... and of course, you've got no legal backup should anything backfire and before anyone says "who cares when you're dead".... I know someone who survived a spin in a warrior and got dragged through the courts backwards by his crippled student.
VFE.