          self.assertEqual(data, new_data)
  
      def test_bulk_update_error(self):
          """
          Correct bulk update serialization should return the input data.
          """
          data = [
              {
                  'id': 0,
                  'title': 'The electric kool-aid acid test',
 
</s> remove                     ret.append(self.from_native(item, None))
                    errors.append(self._errors)
 </s> add                     if update:
                        self._deleted = identity_to_objects.values()
        Incorrect bulk update serialization should return error data.
          self.assertEqual(data, new_data)
  
      def test_bulk_update_error(self):
          """
        Incorrect bulk update serialization should return error data.
          """
          data = [
              {
                  'id': 0,
                  'title': 'The electric kool-aid acid test',
keep keep keep keep replace keep keep keep keep keep
 Add extra tests for errors from incorrect data with multiple create/update 
rest_framework/tests/serializer_bulk_update.py