@Test
  public void testInstallShutdownHook() throws IOException {
    // Test for HBASE-26951
    assertTrue(TEST_UTIL.getHBaseCluster().getMaster().isShutdownHookInstalled());
  }
Return the region and current deployment for the region containing the given row. If the region
cannot be found, returns null. If it is found, but not currently deployed, the second element
of the pair may be null.
hbase-server/src/test/java/org/apache/hadoop/hbase/master/TestMaster.java