Git snippets to checkout latest test-passing commit

example.sh

# get latest commit with passing tests
while true; do npm test && break || git checkout HEAD~1; done

# count how many commits in between
echo $(($(git rev-list --count HEAD..master) - 1))

# checkout where things got broken
while true; do npm test && break || git checkout HEAD~1; done; git checkout master~$(($(git rev-list --count HEAD..master) - 1))