There’s a reason most project don’t have a lot of unit tests. Because a specification, even when fully documented, doesn’t stay static enough to have time to write tests. And if it’s fluid enough, maintaining those tests will hamper velocity.

So you have integration tests that verify the general specs of the software and rely on your skills to verify the finer details. But if you’re using an LLM (and not reviewing every line), you can no longer be confident about those details.

And reviewing every line kills the speed advantage of using LLM.