new_contents: from django.test import TestCase
  from shop.models import Order
  from .factories import UserFactory, OrderFactory
  
  class ShopModelsTestCase(TestCase):
      def setUp(self):
          pass
  
      def test_order_add(self):
          order = OrderFactory.create()
          self.assertEquals(Order.objects.count(), 1)       
  
subject: Add initial tests for models and factories