@After
  public void tearDown() throws Exception {
    this.admin.close();
    for (TableDescriptor htd : this.admin.listTableDescriptors()) {
      LOG.info("Tear down, remove table=" + htd.getTableName());
      TESTING_UTIL.deleteTable(htd.getTableName());
    }
  }
The below tests are testing split region against a running cluster
hbase-server/src/test/java/org/apache/hadoop/hbase/regionserver/TestSplitTransactionOnCluster.java