Sure there will be test harnesses
We can’t test for values—we don’t know what they are. A negative test might be possible (“this thing surely has wrong values”), as a precaution, but not a positive test.
Testing often doesn’t identify all possible classes of flaw—e.g. see:
http://en.wikipedia.org/wiki/Unit_testing#Unit_testing_limitations
It is still very useful, nonetheless.
We can’t test for values—we don’t know what they are. A negative test might be possible (“this thing surely has wrong values”), as a precaution, but not a positive test.
Testing often doesn’t identify all possible classes of flaw—e.g. see:
http://en.wikipedia.org/wiki/Unit_testing#Unit_testing_limitations
It is still very useful, nonetheless.