An example of how to use git bisect with tests to automatically find a bad commit

git_bisect.sh

#! /bin/bash
# author RedRoosterKey

set -e
# set -v

# Example - exit code 125 tells git bisect to skip this commt
# git_bisect.sh --back 10 "cd Release || exit 125; make clean || exit 125; make || exit 125; make test"

back=1
case "${1}" in
    '--back')
        if [ -z "${2}" ]
        then
            >&2 echo "Incorrect Usage!"
            >&2 echo "${0} --back n \"some shell command\""
            exit 1
        else
            back=${2}
        fi
        ;;
    *)
        >&2 echo "Incorrect Usage!"
        >&2 echo "${0} --back n \"some shell command\""
        exit 2
esac

if [ -z "${3}" ]
then
    >&2 echo "Incorrect Usage!"
    >&2 echo "${0} --back n \"some shell command\""
    exit 3
else
    echo running commands "\"${3}\"" to determine commit status
fi

git bisect start HEAD "HEAD~${back}" -- # culprit is among the last ${back} commits
git bisect run sh -c "${3}"
git bisect reset # quit the bisect session