      def test_validation_failed_due_to_invalid_field_returns_appropriate_message(self):
          self.validation_failed_due_to_invalid_field_returns_appropriate_message(self.MockFormValidator())
  
      def test_validation_failed_due_to_multiple_errors_returns_appropriate_message(self):
          self.validation_failed_due_to_multiple_errors_returns_appropriate_message(self.MockFormValidator())
  
      # Same tests on ModelFormValidtionMixin
  
      def test_modelform_validation_returns_content_unchanged_if_already_valid_and_clean(self):
          self.validation_returns_content_unchanged_if_already_valid_and_clean(self.MockModelFormValidator())
 
</s> remove         self.validation_failed_due_to_invalid_field_returns_appropriate_message(self.MockFormValidator())
 </s> add         validator = FormValidator(self.MockFormView())
        self.validation_failed_due_to_invalid_field_returns_appropriate_message(validator) </s> remove         self.validation_returns_content_unchanged_if_already_valid_and_clean(self.MockModelFormValidator())
 </s> add         validator = ModelFormValidator(self.MockModelFormView())
        self.validation_returns_content_unchanged_if_already_valid_and_clean(validator) </s> remove         self.validation_failed_due_to_field_error_returns_appropriate_message(self.MockFormValidator())
 </s> add         validator = FormValidator(self.MockFormView())
        self.validation_failed_due_to_field_error_returns_appropriate_message(validator) </s> remove         self.validation_failure_raises_response_exception(self.MockModelFormValidator())
 </s> add         validator = ModelFormValidator(self.MockModelFormView())
        self.validation_failure_raises_response_exception(validator) </s> remove         self.validation_failed_due_to_no_content_returns_appropriate_message(self.MockFormValidator())
 </s> add         validator = FormValidator(self.MockFormView())
        self.validation_failed_due_to_no_content_returns_appropriate_message(validator)
        validator = FormValidator(self.MockFormView())
        self.validation_failed_due_to_multiple_errors_returns_appropriate_message(validator)
      def test_validation_failed_due_to_invalid_field_returns_appropriate_message(self):
          self.validation_failed_due_to_invalid_field_returns_appropriate_message(self.MockFormValidator())
  
      def test_validation_failed_due_to_multiple_errors_returns_appropriate_message(self):
        validator = FormValidator(self.MockFormView())
        self.validation_failed_due_to_multiple_errors_returns_appropriate_message(validator)
  
      # Same tests on ModelFormValidtionMixin
  
      def test_modelform_validation_returns_content_unchanged_if_already_valid_and_clean(self):
          self.validation_returns_content_unchanged_if_already_valid_and_clean(self.MockModelFormValidator())
keep keep keep keep replace keep keep keep keep keep
 Lots of validator tests passing after refactor 
djangorestframework/tests/validators.py