@Before
  public void setup() throws IOException, InterruptedException {
    // Create a table of three families. This will assign a region.
    TEST_UTIL.createTable(TABLENAME, FAMILIES);
    Table t = TEST_UTIL.getConnection().getTable(TABLENAME);
    TEST_UTIL.waitUntilNoRegionsInTransition();

    // Load the table with data for all families
    TEST_UTIL.loadTable(t, FAMILIES);

    TEST_UTIL.flush();

    t.close();

    TEST_UTIL.ensureSomeRegionServersAvailable(2);
  }
Start up a mini cluster and put a small table of empty regions into it.
hbase-server/src/test/java/org/apache/hadoop/hbase/master/procedure/TestDeleteColumnFamilyProcedureFromClient.java