t7800: don't use test_config in a subshell

Use the new "-C" option to test_config to change the configuration in
the submodule from the top level of the test so that it can be unset
correctly when the test finishes.

Signed-off-by: John Keeping <john@keeping.me.uk>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

diff --git a/t/t7800-difftool.sh b/t/t7800-difftool.sh
index ea35a0241c201ac12c29603a21421199dd097600..48c6e2bc830e74ab8d242e49c08f38609b5ef585 100755 (executable)
--- a/t/t7800-difftool.sh
+++ b/t/t7800-difftool.sh
@@ -492,12 +492,12 @@ 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 &&
+       test_config -C submod/ule diff.tool checktrees &&
+       test_config -C submod/ule difftool.checktrees.cmd '\''
+               test -d "$LOCAL" && test -d "$REMOTE" && echo good
+               '\'' &&
        (
                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