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Bite's checker finds almost no gaps in Rich, Click and qs, but needed fixes to stay honest

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The author tested Bite, a tool that checks whether bug-fix changes are covered by tests, on 40 recent changes each in three well-known open-source projects: Rich, Click and qs. Bite noticed no untested changes in qs and only one small gap each in Rich and Click, which the author judged were not bugs. The initial run produced many false alarms on Rich, so Bite was updated to skip type-hint, version-specific and speed-only commits. A separate bug caused Click's old commits to load the current code, which the author fixed by giving each copy its own src/ folder.

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