@BeforeClass
  public static void setUp() throws Exception {
    startMiniDFSCluster(3);
    FS = CLUSTER.getFileSystem();
    EVENT_LOOP_GROUP = new NioEventLoopGroup();
    CHANNEL_CLASS = NioSocketChannel.class;
    MONITOR = StreamSlowMonitor.create(UTIL.getConfiguration(), "testMonitor");
  }
Make sure lease renewal works. Since it is in a background thread, normal read/write test can not
verify it.
<p>
See HBASE-28955 for more details.
hbase-asyncfs/src/test/java/org/apache/hadoop/hbase/io/asyncfs/TestLeaseRenewal.java