      throttle_classes,
      permission_classes,
  )
  
  from rest_framework.tests.utils import DRFRequestFactory
  
  
  class DecoratorTestCase(TestCase):
  
      def setUp(self):
 
</s> remove         self.factory = DRFRequestFactory()
 </s> add         self.factory = RequestFactory() </s> remove from rest_framework.tests.utils import DRFRequestFactory
 </s> add from rest_framework.tests.utils import RequestFactory </s> remove factory = DRFRequestFactory()
 </s> add factory = RequestFactory() </s> remove class DRFRequestFactory(RequestFactory):
 </s> add class RequestFactory(RequestFactory): </s> remove # from django.test.client import RequestFactory
 </s> add 
from rest_framework.tests.utils import RequestFactory
      throttle_classes,
      permission_classes,
  )
  
from rest_framework.tests.utils import RequestFactory
  
  
  class DecoratorTestCase(TestCase):
  
      def setUp(self):
keep keep keep keep replace keep keep keep keep keep
 Renaming DRFRequestFactory to RequestFactory

Updated tests to reflect the new name. 
rest_framework/tests/decorators.py