@Override
    public void preSplitRegionAfterMETAAction(ObserverContext<MasterCoprocessorEnvironment> ctx)
      throws IOException {
      LOG.info("I'm here");
      latch.countDown();
      throw new IOException("this procedure will fail at here forever");
    }
Class to test HBaseHbck. Spins up the minicluster once at test start and then takes it down
afterward. Add any testing of HBaseHbck functionality here.
hbase-server/src/test/java/org/apache/hadoop/hbase/client/TestHbck.java