old_contents: from wizard_builder.models import QuestionPage
  
  from django.contrib.sites.models import Site
  from django.test import TestCase
  
  
  class SitePageTest(TestCase):
  
      def test_basic_created_question_page_comes_with_a_site(self):
          page = QuestionPage.objects.create()
          self.assertEqual(page.site.domain, 'example.com')
  
      def test_on_site_increments_for_default_site(self):
          count_before = QuestionPage.objects.on_site().count()
          QuestionPage.objects.create()
          count_after = QuestionPage.objects.on_site().count()
          self.assertEqual(count_before + 1, count_after)
  
      def test_on_site_does_not_increment_for_alternate_site(self):
          count_before = QuestionPage.objects.on_site().count()
          page = QuestionPage.objects.create()
          page.site = Site.objects.create()
          page.save()
          count_after = QuestionPage.objects.on_site().count()
          self.assertEqual(count_before, count_after)
  
new_contents: from wizard_builder.models import QuestionPage
  
  from django.contrib.sites.models import Site
  from django.test import TestCase
  from django.conf import settings
  
  
  class TempSiteID():
      '''
          with TempSiteID(1):
              ...
      '''
      def __init__(self, site_id):
          self.site_id_temp = site_id
  
      def __enter__(self):
          self.site_id_stable = getattr(settings, 'SITE_ID', 1)
          settings.SITE_ID = self.site_id_temp
  
      def __exit__(self, *args):
          settings.SITE_ID = self.site_id_stable
  
  
  class SitePageTest(TestCase):
  
      def test_created_question_page_comes_with_a_site(self):
          page = QuestionPage.objects.create()
          self.assertEqual(page.site.domain, 'example.com')
  
      def test_on_site_increments_for_default_site(self):
          count_before = QuestionPage.objects.on_site().count()
          QuestionPage.objects.create()
          count_after = QuestionPage.objects.on_site().count()
          self.assertEqual(count_before + 1, count_after)
  
      def test_on_site_does_not_increment_for_alternate_site(self):
          count_before = QuestionPage.objects.on_site().count()
          page = QuestionPage.objects.create()
          page.site = Site.objects.create()
          page.save()
          count_after = QuestionPage.objects.on_site().count()
          self.assertEqual(count_before, count_after)
  
      def test_question_page_responds_to_site_id_changes(self):
          site_1_pages = 3
          site_2_pages = site_1_pages + 1
          site_2 = Site.objects.create()
          for i in range(site_1_pages):
              QuestionPage.objects.create()
          for i in range(site_2_pages):
              QuestionPage.objects.create(site=site_2)
  
          self.assertEqual(QuestionPage.objects.on_site().count(), site_1_pages)
          with TempSiteID(site_2.id):
              self.assertEqual(QuestionPage.objects.on_site().count(), site_2_pages)
  
subject: expand site_id tests further!