I joined a project - small startup - code in production for... 4 months at this point. 0 tests of any sort. First week, I do a small feature, add a test, and it was blocked, because I used a single letter variable name in a data setup method in a test file. "Single letter variables aren't professional". Developing and pushing code with no tests for 6+ months apparently is just fine though. I was tempted to use a four-letter variable name... They then got automated-linting fever.