old_contents: from __future__ import absolute_import
  
  import redisext.backend.redis
  
  
  class Redis(redisext.backend.redis.Redis):
      SETTINGS = {'host': 'localhost', 'port': 6379, 'db': 0}
  
new_contents: from __future__ import absolute_import
  
  import unittest
  
  import redisext.backend.redis
  
  
  class Redis(redisext.backend.redis.Redis):
      SETTINGS = {'host': 'localhost', 'port': 6379, 'db': 0}
  
  
  class TestCase(unittest.TestCase):
      def tearDown(self):
          Redis.connect().flushdb()
  
subject: extend fixtures