Unit tests aren't intrinsic or automatic. They're extra pieces of code that have to be written, debugged and maintained by human beings. They ought to be consid

Unit tests aren't intrinsic or automatic. They're extra pieces of code that have to be written, debugged and maintained by human beings. They ought to be considered as little more than extremely limited, narrowly-scoped sanity checks; not definitive pass/fail gates for the code they're exercising.