A system might possess ';test cases'; supposedly guaranteeing that the system runs correctly. But might not?

the test cases somehow miss out on being run ? Or might not the test cases be ';run'; but with phony data substituted for the real test cases, so that, again, the test cases miss out on being run ?A system might possess ';test cases'; supposedly guaranteeing that the system runs correctly. But might not?
Its definately a possibility thats for sure :)A system might possess ';test cases'; supposedly guaranteeing that the system runs correctly. But might not?
If its fony i wouldnt