async def METHOD_NAME(systemd_service: SystemdService, dbus_session_bus: MessageBus):
    """Test reboot."""
    systemd_service.Reboot.calls.clear()
    systemd = Systemd()
    with pytest.raises(DBusNotConnectedError):
        await systemd.reboot()
    await systemd.connect(dbus_session_bus)
    assert await systemd.reboot() is None
    assert systemd_service.Reboot.calls == [tuple()]