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Tests serve so many purposes is wonder people don’t do them more (or avoid them at all) Feedback on design, verification of implementation, documentation of behaviour, uncovering edge cases, automatic regression testing - well written tests are priceless

Simplecov is pretty easy to plumb into gitlab CI, and you see the results in the merge request gui.

I only care about now. Haven’t used anything to track historically. I usually just check it when I’m changing an area and want to judge risk.

Before Sidekiq, I worked at a startup whose app was constantly breaking. The main dev was constantly fire fighting bugs in production! Why? No test suite. He manually tested everything. I came on board and started writing tests every day. No app code, just tests. After a month, no more fires.