          generate a formfield with no specified protocol. See #20740.
          """
          model_field = models.GenericIPAddressField(protocol='IPv4')
          form_field = model_field.formfield()
          self.assertRaises(ValidationError, form_field.clean, '::1')
          model_field = models.GenericIPAddressField(protocol='IPv6')
          form_field = model_field.formfield()
          self.assertRaises(ValidationError, form_field.clean, '127.0.0.1')
  
      def test_null_value(self):
 
</s> remove         self.assertRaises(ValidationError, form_field.clean, '127.0.0.1')
 </s> add         with self.assertRaises(ValidationError):
            form_field.clean('127.0.0.1') </s> remove         self.assertRaises(ValidationError, site.full_clean)
 </s> add         with self.assertRaises(ValidationError):
            site.full_clean() </s> remove         self.assertRaises(ValidationError, site.full_clean)
 </s> add         with self.assertRaises(ValidationError):
            site.full_clean() </s> remove         self.assertRaises(ValidationError, f.clean, '0', None)
 </s> add         with self.assertRaises(ValidationError):
            f.clean('0', None) </s> remove         self.assertRaises(ValidationError, f.clean, None, None)
        self.assertRaises(ValidationError, f.clean, '', None)
 </s> add         with self.assertRaises(ValidationError):
            f.clean(None, None)
        with self.assertRaises(ValidationError):
            f.clean('', None)
        with self.assertRaises(ValidationError):
            form_field.clean('::1')
          generate a formfield with no specified protocol. See #20740.
          """
          model_field = models.GenericIPAddressField(protocol='IPv4')
          form_field = model_field.formfield()
        with self.assertRaises(ValidationError):
            form_field.clean('::1')
          model_field = models.GenericIPAddressField(protocol='IPv6')
          form_field = model_field.formfield()
          self.assertRaises(ValidationError, form_field.clean, '127.0.0.1')
  
      def test_null_value(self):
keep keep keep keep replace keep keep keep keep keep
 Refs #26022 -- Used context manager version of assertRaises in tests. 
tests/model_fields/tests.py