double-error.js

var util = require('util');
var assert = require('assert');
var net = require('net');
 
var SIZE = 2E6;
var BUF = new Buffer(SIZE);
var ERRS = 0;
var PORT = 4000;
 
BUF.fill(0x62);
 
var errs = [];

var srv = net.createServer(function onConnection(conn) {
  conn.write(BUF);
  conn.on('error', function (err) {
    errs.push(err);
    if (errs.length > 1 && errs[0] === errs[1]) {
      assert(false, "We should not be emitting the same error twice");
      srv.close();
    }
  });
}).listen(PORT, function () {
  var client = net.connect({ port: PORT });
 
  client.on('connect', function () {
    client.resume();
    client.destroy();
  });
}).unref();