def test_get_direction_text(self):
     self.assertIsNone(
         DataHelper.get_direction_text(
             Direction.objects.get(pk=0),  # 不明
         ), )
     self.assertEqual(
         DataHelper.get_direction_text(Direction.objects.get(pk=5), ),
         '南',
     )
 def direction_text(self):
     return DataHelper.get_direction_text(self.direction)