Channel sc = sb.bind().sync().channel();
Channel cc = cb.connect().sync().channel();
ChannelFuture f = cc.write(a);
assertTrue(f.cancel(false));
cc.writeAndFlush(b);
cc.write(c);
ChannelFuture f2 = cc.write(d);
assertTrue(f2.cancel(false));
cc.writeAndFlush(e);