ya, the standard white-knuckle test doesn't work on integral locks, because when you white-knuckle you actually make the lock more secure -- unlike a liner lock, where you make it less secure.
I've never heard of any integral lock failing the spine pressure or spine whack test either. Just too much lock.
However, someone reported a Sebenza failing the white knuckle + torque test. I think he was torquing counter clockwise. In fact, I recall he said he was holding the knife in his hand at the time. I'm pretty sure it was Snickersnee who said this -- perhaps someone can drag him over from the defense forum to discuss this. Other than Snickersnee's report, I've never heard of a Sebenza's lock giving way.
Joe