t7800: add a difftool test for .git-files

Signed-off-by: David Aguilar <davvid@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

diff --git a/t/t7800-difftool.sh b/t/t7800-difftool.sh
index 2418528487624bf5497af71c9958a84e0a50328f..5a193c500d282cc2b13e8de6e128229585897a16 100755 (executable)
--- a/t/t7800-difftool.sh
+++ b/t/t7800-difftool.sh
@@ -434,4 +434,18 @@ test_expect_success PERL 'difftool --no-symlinks detects conflict ' '
        )
 '
 
+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