When asked to write UI tests (playwright), I've seen Claude Code do essentially the following:

const elem = document.querySelector(".foo"); // actual element that exists elem.innerHTML = '<div class="bar"></div>'; const child = elem.locator(".bar"); // child we actually want to test for expect(child).toExist()

Gee thanks Claude, what a great test...

Same. Drives me up the wall. I’m writing my own coding agent now and I’m baking into it prompts against all the anti patterns I’ve see.