def METHOD_NAME(self):
    """Check if clean method works."""
    new = FoodEvent(
        event=self.event2,
        start=self.food_event.start + datetime.timedelta(minutes=10),
        end=timezone.now() - datetime.timedelta(hours=100),
    )
    with self.subTest(msg="end before start"):
        with self.assertRaises(ValidationError):
            new.clean()