@Test
public void testValidGraphiteMetricQueryResultWithNull() throws Exception {

        Instant fixedInstant = Instant.parse("2020-03-02T05:05:39Z");
        MetricQueryService metricQueryService = new MetricQueryService(httpClient);
        MetricData metricDataResult = metricQueryService.queryMetricSource(metricSourceSinkConfig,
                        metricFunctionsSpec, fixedInstant);
        assertEquals(155.0, metricDataResult.getValue(), 0.1);
        assertEquals(1583125500, metricDataResult.getTimestamp());
}