def setUp(self):         self.model_fields = [f.name for f in Agency._meta.fields]         self.gtfs_fields = get_all_fields("Agency")      def test_all_fields_present(self):         """Make sure the model has properties for all fields - regardless if required - provided by the GTFS standard."""         for f in self.gtfs_fields:             with self.subTest(f=f):                 self.assertIn(f["name"], self.model_fields)          def test_constructor_all_fields(self):         """Make sure all of the models fields of the model are initializable"""         with self.subTest(name="fixed"):             """Fixed subTest"""             d = data[0]             values = {f["name"]: d[f["type"]] for f in self.gtfs_fields}             obj = Agency(**values)             self.assertIsNotNone(obj)             self.assertIsInstance(obj, models.Model)          with self.subTest(name="other"):             d = data[random.randint(0,len(data))]             values = {f["name"]: d[f["type"]] for f in self.gtfs_fields}             obj = Agency(**values)             self.assertIsNotNone(obj)             self.assertIsInstance(obj, models.Model)