### Question:
FiscoBcosBroker4Producer extends FiscoBcosTopicAdmin implements IProducer { @Override public boolean shutdownProducer() { return true; } FiscoBcosBroker4Producer(FiscoBcosDelegate fiscoBcosDelegate); @Override boolean startProducer(); @Override boolean shutdownProducer(); @Override CompletableFuture<SendResult> publish(WeEvent event, String groupIdStr);  }### Answer:
@Test public void testShutdownProducer() { Assert.assertTrue(this.iProducer.shutdownProducer()); }