submodule: don't rely on overlayed config when setting diffopts

diff --git a/t/t3701-add-interactive.sh b/t/t3701-add-interactive.sh
index 2ecb43a61652032862d5a264ede8af473ef345e1..2f3e7cea64e897299d87196135032de22050354b 100755 (executable)
--- a/t/t3701-add-interactive.sh
+++ b/t/t3701-add-interactive.sh
@@ -477,4 +477,12 @@ test_expect_success 'add -p does not expand argument lists' '
        ! grep not-changed trace.out
 '
 
+test_expect_success 'hunk-editing handles custom comment char' '
+       git reset --hard &&
+       echo change >>file &&
+       test_config core.commentChar "\$" &&
+       echo e | GIT_EDITOR=true git add -p &&
+       git diff --exit-code
+'
+
 test_done