test_expect_success 'rebase -i respects core.commentchar' '
git reset --hard &&
git checkout E^0 &&
- git config core.commentchar "\\" &&
- test_when_finished "git config --unset core.commentchar" &&
+ test_config core.commentchar "\\" &&
write_script remove-all-but-first.sh <<-\EOF &&
sed -e "2,\$s/^/\\\\/" "$1" >"$1.tmp" &&
mv "$1.tmp" "$1"