)
'
+test_expect_success PERL 'difftool properly honors gitlink and core.worktree' '
+ git submodule add ./. submod/ule &&
+ (
+ cd submod/ule &&
+ test_config diff.tool checktrees &&
+ test_config difftool.checktrees.cmd '\''
+ test -d "$LOCAL" && test -d "$REMOTE" && echo good
+ '\'' &&
+ echo good >expect &&
+ git difftool --tool=checktrees --dir-diff HEAD~ >actual &&
+ test_cmp expect actual
+ )
+'
+
test_done