grep: enable recurse-submodules to work on <tree> objects

diff --git a/t/t4014-format-patch.sh b/t/t4014-format-patch.sh
index 8d90a6e500362afe75fb724e07848e904753e7fb..ba4902df2b605f89ec2abcac50abefc2f23fc9bf 100755 (executable)
--- a/t/t4014-format-patch.sh
+++ b/t/t4014-format-patch.sh
@@ -1086,6 +1086,15 @@ test_expect_success 'empty subject prefix does not have extra space' '
        test_cmp expect actual
 '
 
+test_expect_success '--rfc' '
+       cat >expect <<-\EOF &&
+       Subject: [RFC PATCH 1/1] header with . in it
+       EOF
+       git format-patch -n -1 --stdout --rfc >patch &&
+       grep ^Subject: patch >actual &&
+       test_cmp expect actual
+'
+
 test_expect_success '--from=ident notices bogus ident' '
        test_must_fail git format-patch -1 --stdout --from=foo >patch
 '