Executes ``ansible-playbook`` against the converge playbook with the
        ``-syntax-check`` flag and returns None.

        :return: None

def syntax(self):
        """
        Executes ``ansible-playbook`` against the converge playbook with the
        ``-syntax-check`` flag and returns None.

        :return: None
        """
        pb = self._get_ansible_playbook(self.playbooks.converge)
        pb.add_cli_arg('syntax-check', True)
        pb.execute()