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It was a bright, sunny morning. There were no signs of trouble. I came to work, opened Slack, and received many messages from my coworkers about failed tests. After a few hours of investigation, the situation became clear: I'm responsible for the unit tests subsystem in Rider, and only tests from this subsystem were failing. I didn't commit anything to the subsystem for a week because I worked with a local branch. Other developers also didn't touch this code. The unit tests subsystem is comp...