@Override
    public void unsubscribeService(Service service, Subscriber subscriber, String clientId) {
        // Subscriber is an ephemeral type only, so call ephemeral client directly
        ephemeralClientOperationService.unsubscribeService(service, subscriber, clientId);
    }
@Test
    void testUnsubscribeService() {
        clientOperationServiceProxy.unsubscribeService(service, subscriber, ephemeralIpPortId);
        verify(ephemeralClientOperationServiceImpl).unsubscribeService(service, subscriber, ephemeralIpPortId);
        verify(persistentClientOperationServiceImpl, never()).unsubscribeService(service, subscriber, ephemeralIpPortId);
    }