old_contents: from .base import INSTALLED_APPS
  
  INSTALLED_APPS = INSTALLED_APPS + (
      'django_comments',
  )
  
  COMMENTS_APP = 'molo.commenting'
  SITE_ID = 1
  
new_contents: from .base import INSTALLED_APPS
  
  INSTALLED_APPS = INSTALLED_APPS + [
      'django_comments',
  ]
  
  COMMENTS_APP = 'molo.commenting'
  SITE_ID = 1
  
subject: fix tests for django 1.9