new_contents: from django.contrib import admin
  from django.test import TestCase
  
  from ..models import Article, Category
  
  import sys
  import mock
  
  
  class TestArticleAdminBase(TestCase):
  
      def test_article_admin(self):
          del sys.modules['cms.apps.news.admin']
  
          admin.site.unregister(Article)
          admin.site.unregister(Category)
  
          with mock.patch('cms.apps.news.admin.externals.reversion', new=False):
              from ..admin import ArticleAdmin, ArticleAdminBase
              assert ArticleAdmin
              self.assertIs(ArticleAdmin.__bases__[0], ArticleAdminBase)
              self.assertEqual(len(ArticleAdmin.__bases__), 1)
  
subject: Improve coverage of `cms.apps.news.admin`.