Yes
It created some private puppeteer instance in some scratch directory, installed Chrome, wrote tests, ran them, and then reported success
torginus on Hacker News
In the thread “I tricked Claude into leaking your deepest, darkest secrets”, replying to this comment
Helped: Autonomous setup of test environment and execution.
I asked Claude Code to rawdog a change in a frontend repo, no way to run tests. It created some private puppeteer instance in some scratch directory, installed Chrome, wrote tests, ran them, and then reported success. None of which I'd have know if it hadn't told me.