test_expect_success 'stdin -z update refs fails with wrong old value' '
git update-ref $c $m &&
- printf $F "update $a" "$m" "$m" "update $b" "$m" "$m" "update $c" "" "$Z" >stdin &&
+ printf $F "update $a" "$m" "$m" "update $b" "$m" "$m" "update $c" "$m" "$Z" >stdin &&
test_must_fail git update-ref -z --stdin <stdin 2>err &&
grep "fatal: Cannot lock the ref '"'"'$c'"'"'" err &&
git rev-parse $m >expect &&