@Override
    public Collection<Subscriber> getSubscribers(String namespaceId, String serviceName) {
        String serviceNameWithoutGroup = NamingUtils.getServiceName(serviceName);
        String groupName = NamingUtils.getGroupName(serviceName);
        Service service = Service.newService(namespaceId, groupName, serviceNameWithoutGroup);
        return getSubscribers(service);
    }
@Test
    void testGetSubscribersByString() {
        Collection<Subscriber> actual = subscriberService.getSubscribers(service.getNamespace(), service.getGroupedServiceName());
        assertEquals(1, actual.size());
        assertEquals(service.getGroupedServiceName(), actual.iterator().next().getServiceName());
    }