Hmmm I have never had to test a clutch before, but if I had to I would hold the breaks while letting the clutch out, if it slips then you know you have problems, if it stalls then it may be good, if it slips then stalls still bad clutch.
I can't think of anything else it could be other then water and mud in the bell housing causing the clutch to act up, but when I replaced mine (had the engine out and found the clutch needed replacing so I replaced it) the Bell was full of muck, and the clutch felt fine when I drove it. It is a big pain to replace as you need to either drop the tranns and T-case or pull the engine out; the parts are not all that expensive.
Don't forget to
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first then ask questions later! The loose nut behind the wheel