Munk,
I tend to think the problem is usually 99% user and 1% knife. You should test the knife to see if it works under normal conditions. If it fails you have a defective knife; if it survives you have a good well functioning knife. Yes, perhaps under extreme conditions such a knife can break, so can every other piece of natural and issued equipment that you will have with you. It is up to the user to keep their head under pressure. Chances are you will break your leg (and perhaps your neck) if you leap off a 20 foot cliff. There is no point is testing that under normal circumstances. You just need to stay focus and remember that there are some things that you really should try to avoid. Chopping through tempered steel with a knife is probably a good example.
n2s