1 files changed, 4 insertions, 0 deletions
diff --git a/test/AngularSpec.js b/test/AngularSpec.js
index bf952249..da70aef7 100644
--- a/test/AngularSpec.js
+++ b/test/AngularSpec.js
@@ -909,6 +909,10 @@ describe('angular', function() {
     it('should not serialize scope instances', inject(function($rootScope) {
       expect(toJson({key: $rootScope})).toEqual('{"key":"$SCOPE"}');
     }));
+
+    it('should serialize undefined as undefined', function() {
+      expect(toJson(undefined)).toEqual(undefined);
+    });
   });
 
 });