@Before
  public void setUp() throws Exception {
    Configuration conf = TEST_UTIL.getConfiguration();
    // Increase the frequency of some of the chores for responsiveness of the test
    SpaceQuotaHelperForTests.updateConfigForQuotas(conf);
    conf.setInt(QuotaObserverChore.REGION_REPORT_RETENTION_DURATION_KEY, 1000);
  }
A test case to verify that region reports are expired when they are not sent.
hbase-server/src/test/java/org/apache/hadoop/hbase/quotas/TestQuotaObserverChoreRegionReports.java