new_contents: from django.conf import settings
  from django.contrib import admin
  from django.test import TestCase
  
  from ..models import Country, CountryGroup, Page
  
  import sys
  
  
  class TestArticleAdminBase(TestCase):
  
      def test_article_admin(self):
          NEW_MIDDLEWARE_CLASSES = settings.MIDDLEWARE_CLASSES + (
              'cms.middleware.LocalisationMiddleware',
          )
  
          self.assertNotIn(Country, admin.site._registry)
          self.assertNotIn(CountryGroup, admin.site._registry)
  
          with self.settings(MIDDLEWARE_CLASSES=NEW_MIDDLEWARE_CLASSES):
              module = sys.modules['cms.apps.pages.admin']
              del sys.modules['cms.apps.pages.admin']
  
              admin.site.unregister(Page)
  
              from ..admin import page_admin
              assert page_admin
  
              self.assertIn(Country, admin.site._registry)
              self.assertIn(CountryGroup, admin.site._registry)
  
              sys.modules['cms.apps.pages.admin'] = module
  
subject: Add test for optional page admin registrations for Country and CountryGroup.