public SingleProcessHBaseCluster getMiniHBaseCluster() {
    if (this.hbaseCluster == null || this.hbaseCluster instanceof SingleProcessHBaseCluster) {
      return (SingleProcessHBaseCluster) this.hbaseCluster;
    }
    throw new RuntimeException(
      hbaseCluster + " not an instance of " + SingleProcessHBaseCluster.class.getName());
  }
Returns current mini hbase cluster. Only has something in it after a call to
{@link #startMiniCluster()}.
@see #startMiniCluster()
hbase-server/src/test/java/org/apache/hadoop/hbase/HBaseTestingUtil.java