@Test
  public void commonCaseTest() throws InterruptedException {
    withDefaultsTest(false);
    withDefaultsTest(true);
    withInjectedMetricsTest(false);
    withInjectedMetricsTest(true);
  }
Tests the common case uses of {@link RestRequestMetricsTracker} i.e. with and without a custom
{@link RestRequestMetrics}.
ambry-api/src/test/java/com/github/ambry/rest/RestRequestMetricsTrackerTest.java