Avoit to commit tests with `only`

pre-commit

# Redirect output to stderr.
exec 1>&2
 
# prevent it.only or describe.only commited
if [ "$allowonlytests" != "true" ] &&
    test $(git diff --cached | grep -E "\b(it|describe).only\("  | wc -l) != 0
then
    cat <<\EOF
Error: Attempt to add it.only or describe.only - which may disable all other tests
 
If you know what you are doing you can disable this check using:
 
    git config hooks.allowonlytests true
EOF
    exit 1
fi
 
exit 0