My unpopular opinion is AI sucks at writing tests. Like, really sucks. It can churn out a lot of them, but they're shitty.

Actually writing good tests that exercise the behavior you want, guard against regressions, and isn't overfitted to your code is pretty difficult, really. You need to both understand the function and understand the structure to do it

Even for hobby projects, it's not great. I'm learning asyncio by writing a matrix scraper and writing good functional tests as you go is worth it to make sure you actually do understand the concepts