@Override
    public void setControllers(List<ControllerInfo> controllers) {
        DriverHandler handler = handler();
        OvsdbClientService clientService = getOvsdbClientService(handler);
        if (!clientService.getControllers(handler().data().deviceId())
                .equals(ImmutableSet.copyOf(controllers))) {
            clientService.setControllersWithDeviceId(handler().
                    data().deviceId(), controllers);
        }
    }
@Test
    public void testSetControllers() throws Exception {

    }