@AfterClass
  public static void afterClass() throws Exception {
    WATCHER_A.close();
    WATCHER_B.close();
    UTIL.shutdownMiniCluster();
  }
Test the reading and writing of access permissions to and from zookeeper.
hbase-server/src/test/java/org/apache/hadoop/hbase/security/access/TestZKPermissionWatcher.java