Example of an addition to isSignedBadge test that will cause it to fail

gistfile1.txt

diff --git a/test/validator-utils.test.js b/test/validator-utils.test.js
index 9f04e37..e238766 100644
--- a/test/validator-utils.test.js
+++ b/test/validator-utils.test.js
@@ -41,6 +41,7 @@ test('validator.absolutize: all absolute', function (t) {
 });
 
 test('validator.isSignedBadge', function (t) {
+  t.same(validator.isSignedBadge("http://sub.domain.org"), false);
   t.same(validator.isSignedBadge(sign('sup')), false);
   t.same(validator.isSignedBadge(sign({some: 'thing'})), false);
   t.same(validator.isSignedBadge(sign({recipient: 'yep'})), true);