old_contents: #!/usr/bin/env python
  # -*- coding: utf-8 -*-
  from opps.core.tests.test_obj_tags import *
  
new_contents: #!/usr/bin/env python
  # -*- coding: utf-8 -*-
  from opps.core.tests.test_obj_tags import *
  from opps.core.tests.test_cache import *
  
subject: add test cache mobile in core