test/send-email: --[no-]xmailer tests

diff --git a/t/t1300-repo-config.sh b/t/t1300-repo-config.sh
index 3f80ff0c14c47b87bbbecb74d1951a1abe6bc5ba..46f6ae25714d55066159d96f4a496f60a10790da 100755 (executable)
--- a/t/t1300-repo-config.sh
+++ b/t/t1300-repo-config.sh
@@ -1010,6 +1010,17 @@ test_expect_success 'git -c "key=value" support' '
        test_must_fail git -c name=value config core.name
 '
 
+# We just need a type-specifier here that cares about the
+# distinction internally between a NULL boolean and a real
+# string (because most of git's internal parsers do care).
+# Using "--path" works, but we do not otherwise care about
+# its semantics.
+test_expect_success 'git -c can represent empty string' '
+       echo >expect &&
+       git -c foo.empty= config --path foo.empty >actual &&
+       test_cmp expect actual
+'
+
 test_expect_success 'key sanity-checking' '
        test_must_fail git config foo=bar &&
        test_must_fail git config foo=.bar &&