### Question:
FabricTopicAdmin implements IEventTopic { @Override public ListPage<TbNode> queryNodeList(QueryEntity queryEntity) throws BrokerException { validateChannelName(queryEntity.getGroupId()); return fabricDelegate.getFabricMap().get(queryEntity.getGroupId()) .queryNodeList(queryEntity.getPageNumber(), queryEntity.getPageSize()); } FabricTopicAdmin(FabricDelegate fabricDelegate); @Override boolean open(String topic, String channelName); @Override boolean close(String topic, String channelName); @Override WeEvent getEvent(String eventId, String channelName); @Override boolean exist(String topic, String channelName); @Override TopicPage list(Integer pageIndex, Integer pageSize, String channelName); @Override TopicInfo state(String topic, String channelName); @Override List<String> listGroupId(); @Override Long getBlockHeight(String channelName); @Override GroupGeneral getGroupGeneral(String channelName); @Override ListPage<TbTransHash> queryTransList(QueryEntity queryEntity); @Override ListPage<TbBlock> queryBlockList(QueryEntity queryEntity); @Override ListPage<TbNode> queryNodeList(QueryEntity queryEntity); @Override ContractContext getContractContext(String groupId); @Override boolean addOperator(String groupId, String topicName, String address); @Override boolean delOperator(String groupId, String topicName, String address); @Override List<String> listOperator(String groupId, String topicName); @Override void validateGroupId(String channelName);  }### Answer:
@Test public void queryNodeList() throws BrokerException { this.queryEntity = new QueryEntity(); queryEntity.setGroupId(this.channelName); queryEntity.setPageSize(10); queryEntity.setPageNumber(1); ListPage<TbNode> tbNodes = this.iProducer.queryNodeList(queryEntity); Assert.assertNotNull(tbNodes); Assert.assertTrue(tbNodes.getTotal() > 0); }