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