             for filename in os.listdir(os.path.dirname(__file__))
             if filename.endswith('.py') and not filename.startswith('_')]
  
  for module in modules:
      exec("from djangorestframework.tests.%s import *" % module) 
</s>
             for filename in os.listdir(os.path.dirname(__file__))
             if filename.endswith('.py') and not filename.startswith('_')]
  
  for module in modules:

keep keep keep keep replace
 modified tests.__init__ so it also test module docstrings
djangorestframework/tests/__init__.py