public String getSubscriptionsForChannel(String subscribeChannel) {
        return filterService.getFiltersForChannel(subscribeChannel).stream()
                .map(PrioritizedFilter::toString)
                .collect(Collectors.joining(",\n", "[", "]"));
    }
@Test
    void testGetSubscriptionsForChannel() {
        String channel = "test";
        service.getSubscriptionsForChannel(channel);
        Mockito.verify(filterService, Mockito.times(1)).getFiltersForChannel(channel);
    }