def METHOD_NAME(self):
    parsed_args = mock.Mock()
    parsed_args.generate_cli_skeleton = None
    with mock.patch('sys.stdout', six.StringIO()) as mock_stdout:
        rc = self.argument.generate_json_skeleton(
            service_operation=self.service_operation, call_parameters=None,
            parsed_args=parsed_args, parsed_globals=None
        )
        # Ensure nothing is printed to standard output
        self.assertEqual('', mock_stdout.getvalue())
        # Ensure nothing is returned because it was never called.
        self.assertEqual(rc, None)