def update_vpn_service(self, vpn_service, **attrs):
        return self._update(_vpn_service.VPNService, vpn_service, **attrs)
Establish that the _echo_method subcommand decorator works
dataset/ETHPy150Open openstack/python-openstacksdk/openstack/network/v2/_proxy.py/Proxy.update_vpn_service--crossover with--dataset/ETHPy150Open ansible/tower-cli/tests/test_models_base.py/SubcommandTests.test_echo_method_changed_false