I am but an egg, but . . . Even if the components built of units change, and thus trach their tests, won't the tests covering the units still be useful? Also:

I am but an egg, but . . . Even if the components built of units change, and thus trach their tests, won't the tests covering the units still be useful? Also: I find that a lot of component changes are interface changes -- the test code has to change to match the new interface and return values, but still remains useful.