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netty 单元测试如何模拟连接不上的情况.

连不上的情况要如何模拟, 代码如下

public static void main(String[] args) {
        EmbeddedChannel channel = new EmbeddedChannel();
        channel.connect(new InetSocketAddress("0.0.0.0", 9999))
                .addListener(new ChannelFutureListener() {
                    @Override
                    public void operationComplete(ChannelFuture future) throws Exception {
                        if (future.isSuccess()) {
                            // 连接上的业务处理
                        } else {
                            // 切换一个网口重连
                        }
                    }
                });
    };

EmbeddedChannel 每次都是连接成功的, 要如何设置连接失败的情况.


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