If you're writing your own tests, sure, AI is fast at writing code that passes the tests.

But if you write a comprehensive test suite for a problem, you've effectively done the hard development work to solve the problem in the first place. How did the AI help?

Oh have the AI write unit tests you say? Claude cheats constantly at the tests ime. It frequently tests the mock instead of the UUT and reports a pass. That's worse than useless! I'm sure a huge swath of slop unit tests that all pass is acceptable quality for a lot of businesses out there.