def test_order_by_multiple_desc(self):
        s = self.cls("path", {"sortfield": "one,two", "sortdirection": "desc"})
        self.assertEqual(s.order_by, ("-one", "-two"))
order_by property prepends - to each field if multiple.
dataset/ETHPy150Open mozilla/moztrap/tests/view/lists/test_sort.py/SortTest.test_order_by_multiple_desc