test_expect_success 'difftool properly honors gitlink and core.worktree' '
test_when_finished rm -rf submod/ule &&
+ test_config_global protocol.file.allow always &&
git submodule add ./. submod/ule &&
test_config -C submod/ule diff.tool checktrees &&
test_config -C submod/ule difftool.checktrees.cmd '\''