def METHOD_NAME(self, import_mock):
    """
    Check if SystemExit is raised when an unavailable command is requested.
    """
    import_mock.return_value = self._rpyc_mock
    self._mocked_conn.root.command.side_effect = AttributeError()
    with self.assertRaises(SystemExit):
        zapper_run("0.0.0.0", "command")