It ended up being a race condition that I'd never have found on my own, and it then went and found the dozen or so other similar issues in the code base

james_ross on Hacker News

thousands of unit tests and hundreds of playwright e2e tests

In the thread “It took two weeks to make Claude's "overnight solution" for flaky tests useful”

Helped: Using superpowers debugging skill and setting a focused goal to fix one specific test.

Got in the way: Claude self-selecting tests to isolate was concerning.