So I wrote a service a couple of years ago to generate PDFs from some documents. Fully working, covered it with tests (unit and integration). Code was clear and easy to follow.

I've been promoted and the engineer that took it over just went in and rewrote half of it. That would be fine, but they also just deleted every test. So now it's untested.

Glad that's not my problem anymore, I geniunely hope it breaks