I occasionally use git bisect to figure out where I’ve introduced test failures. If you’re not familiar, given known good and bad commits, along with a test command, git bisect does a binary search over your repo to determine where a bug or test failure was introduced. This is especially useful on large repos with a test suite that takes a minute or two (or more ?) to run.

Most of the time, I just need to check the last handful of commits. To that end, I’ve written a bash function that assumes the current HEAD is bad, 10 commits prior is good, and automatically runs a test command that you define.

gbi() { git bisect start git bisect bad git checkout HEAD~10 git bisect good git bisect run "$@" }

This won’t cover every case, but should help automate this fairly verbose process most of the time.