test/parallel/test-net-write-after-close.js

// Copyright Joyent, Inc. and other Node contributors.
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// following conditions:
//
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// in all copies or substantial portions of the Software.
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// OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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// NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
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'use strict';
const common = require('../common');

const net = require('net');

let serverSocket;

const server = net.createServer(common.mustCall(function(socket) {
  serverSocket = socket;

  socket.resume();

  socket.on('error', common.mustCall(function(error) {
    console.error('received error as expected, closing server', error);
    server.close();
  }));
}));

server.listen(0, function() {
  const client = net.connect(this.address().port, function() {
    // client.end() will close both the readable and writable side
    // of the duplex because allowHalfOpen defaults to false.
    // Then 'end' will be emitted when it receives a FIN packet from
    // the other side.
    client.on('end', common.mustCall(() => {
      serverSocket.write('test', common.mustCall());
    }));
    client.end();
  });
});