old_contents: 
  from test_project.settings import *
  
  DATABASES['mongo'] = {
    'ENGINE' : 'django_mongodb_engine',
    'NAME' : 'mutant',
    'OPTIONS': {
      'OPERATIONS': {
        'save' : {'safe' : True},
      }
    }
  }
  
  SOUTH_DATABASE_ADAPTERS = {'mongo': 'django_mongodb_engine.south'}
  
  INSTALLED_APPS.extend(['django_mongodb_engine', 'djangotoolbox'])
  
  # FK and M2M are not supported for nonrel db so we make sure to avoid
  # loading mutant.contrib.related
  INSTALLED_APPS.remove('mutant.contrib.related')
  # But we can test the non rel fields
  INSTALLED_APPS.append('mutant.contrib.nonrel')
  
  DATABASE_ROUTERS = (
      'mongodb_router.MongoRouter',
  )
  
new_contents: 
  from test_project.settings import *
  
  DATABASES['mongo'] = {
    'ENGINE' : 'django_mongodb_engine',
    'NAME' : 'mutant',
    'OPTIONS': {
      'OPERATIONS': {
        'save' : {'safe' : True},
      }
    }
  }
  
  SOUTH_DATABASE_ADAPTERS = {'mongo': 'django_mongodb_engine.south_adapter'}
  
  INSTALLED_APPS.extend(['django_mongodb_engine', 'djangotoolbox'])
  
  # FK and M2M are not supported for nonrel db so we make sure to avoid
  # loading mutant.contrib.related
  INSTALLED_APPS.remove('mutant.contrib.related')
  # But we can test the non rel fields
  INSTALLED_APPS.append('mutant.contrib.nonrel')
  
  DATABASE_ROUTERS = (
      'mongodb_router.MongoRouter',
  )
  
subject: Make sure to load the new mongo south adapter