I am hand-holding the AI on the e2e setup. It mostly consists of Playwright + Cucumber + a test API to set up more complex scenarios. I also have unit tests for logic that lends itself to that. I also use mocked LLM responses for LLM projects.

If you enjoy writing tests, AI is really good at finding appropriate fixes for bugs that are easily reproducable. Just make sure to always have another AI review the fix. Otherwise you get a lot very, very dirty quickfixes. (At least in my experience.)