def test_cannot_save_empty_list_items(self):
list_ = List.objects.create()
item = Item(list=list_, text='')
with self.assertRaises(ValidationError):
item.save()
item.full_clean()
def test_item_is_related_to_list(self):
list_ = List.objects.create()
item = Item()
item.list = list_
item.save()
self.assertIn(item, list_.item_set.all())