I work on a team with 75% of the developers don't write any tests. You never know what you're going to run into. Did I cause a new bug, or did I discover an old

I work on a team with 75% of the developers don't write any tests. You never know what you're going to run into. Did I cause a new bug, or did I discover an old one? It's embarrassing when you discover completely non-working code paths. I'm not even looking for a particularly high level of test coverage, just a basic "I wrote an API, here's a test (integration, unit, doesn't matter) for the happy path"-level of coverage would be great. On the opposite end, I worked at places that wanted unit tests for every new function, even if it was something simple (like a getter or setter) used elsewhere. That's also terrible.