def test_notes_str(self):
        self.order.notes = collections.OrderedDict({"1": 1, 2: "2", 3: 3, 4: "four"})
        self.assertEqual(self.order.notes_str, "1,2,3,four")
        self.order.notes = collections.OrderedDict()
        self.assertEqual(self.order.notes_str, "")