'Property marked with special char ! updatable by no one'

def test_update_locked_down_protected_prop(self):

    self.set_property_protections()
    request = unit_test_utils.get_fake_request(roles=['admin'])
    image = {'name': 'image-1'}
    extra_props = {'x_none_update': 'bar'}
    created_image = self.controller.create(request, image=image, extra_properties=extra_props, tags=[])
    another_request = unit_test_utils.get_fake_request(roles=['fake_role'])
    changes = [{'op': 'replace', 'path': ['x_none_update'], 'value': 'baz'}]
    self.assertRaises(webob.exc.HTTPConflict, self.controller.update, another_request, created_image.image_id, changes)
