But if you test a knife's ability to stand up to abuse it is not designed or intended to do and it fails, what have you proven. Some cheap knives may pass that test because they've been tempered to a lower Rc in order to make them tougher. They won't hold an edge as well and would thoroughly suck at slicing because they were ground with a thick edge, but they can handle brick and rocks. I'd prefer a knife that cuts well and test for that. YMMV