MetricQueryService { public MetricQueryService() { this(new HttpClientWrapper()); } MetricQueryService();  MetricQueryService(HttpClientWrapper httpClientWrapper); MetricData queryMetricSource(Config metricSourceSinkConfig, MetricFunctionsSpec metricFunctionsSpec,
            Instant instant);  }
@Test public void testMetricQueryService() throws Exception { MetricQueryService metricQueryService = new MetricQueryService(); assertTrue(metricQueryService != null); }