[timothycoleman]

Unfortunately the tests can't (usually) cover all behaviours.

And perhaps more importantly, they don't capture more abstract properties of the code like maintainability.

AI works best in well maintained code, but unless care is taken, the AI will (today, anyway) make the code less well maintained as it goes.

If the AI is allowed to introduce mess into the codebase faster than its ability to deal with the mess increases, the codebase will eventually run into a problem that it's hard to recover from.

[theshrike79]

And that's kind of the point, some manual testing is always needed - even when humans write the code.

But you can test things and behaviours to a sufficient degree. Nobody really does 100% test coverage on real world code (outside of medical, airplanes and space of course).