config: handle conditional include when $GIT_DIR is not set up

diff --git a/t/t0056-git-C.sh b/t/t0056-git-C.sh
index 99c037703a676dd63e4c2b53ea87601fc2503b88..2630e756dab7322a5360a67766a648a80a5a7222 100755 (executable)
--- a/t/t0056-git-C.sh
+++ b/t/t0056-git-C.sh
@@ -14,6 +14,16 @@ test_expect_success '"git -C <path>" runs git from the directory <path>' '
        test_cmp expected actual
 '
 
+test_expect_success '"git -C <path>" with an empty <path> is a no-op' '
+       (
+               mkdir -p dir1/subdir &&
+               cd dir1/subdir &&
+               git -C "" rev-parse --show-prefix >actual &&
+               echo subdir/ >expect &&
+               test_cmp expect actual
+       )
+'
+
 test_expect_success 'Multiple -C options: "-C dir1 -C dir2" is equivalent to "-C dir1/dir2"' '
        test_create_repo dir1/dir2 &&
        echo 1 >dir1/dir2/b.txt &&