### Question:
BrokerStatusSubCommand implements SubCommand { @Override public void execute(CommandLine commandLine, Options options, RPCHook rpcHook) { DefaultMQAdminExt defaultMQAdminExt = new DefaultMQAdminExt(rpcHook); defaultMQAdminExt.setInstanceName(Long.toString(System.currentTimeMillis())); try { defaultMQAdminExt.start(); String brokerAddr = commandLine.hasOption('b') ? commandLine.getOptionValue('b').trim() : null; String clusterName = commandLine.hasOption('c') ? commandLine.getOptionValue('c').trim() : null; if (brokerAddr != null) { printBrokerRuntimeStats(defaultMQAdminExt, brokerAddr, false); } else if (clusterName != null) { Set<String> masterSet = CommandUtil.fetchMasterAndSlaveAddrByClusterName(defaultMQAdminExt, clusterName); for (String ba : masterSet) { try { printBrokerRuntimeStats(defaultMQAdminExt, ba, true); } catch (Exception e) { e.printStackTrace(); } } } } catch (Exception e) { e.printStackTrace(); } finally { defaultMQAdminExt.shutdown(); } }  @Override String commandName(); @Override String commandDesc(); @Override Options buildCommandlineOptions(Options options); @Override void execute(CommandLine commandLine, Options options, RPCHook rpcHook); void printBrokerRuntimeStats(final DefaultMQAdminExt defaultMQAdminExt, final String brokerAddr,
        final boolean printBroker);  }### Answer:
@Test public void testExecute() { BrokerStatusSubCommand cmd = new BrokerStatusSubCommand(); Options options = ServerUtil.buildCommandlineOptions(new Options()); String[] subargs = new String[] {"-b 127.0.0.1:10911", "-c default-cluster"}; final CommandLine commandLine = ServerUtil.parseCmdLine("mqadmin " + cmd.commandName(), subargs, cmd.buildCommandlineOptions(options), new PosixParser()); cmd.execute(commandLine, options, null); }