node/test/sequential/test-net-reconnect-error.js

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'use strict';
const common = require('../common');
const net = require('net');
const assert = require('assert');
const N = 20;
let disconnectCount = 0;

const c = net.createConnection(common.PORT);

c.on('connect', common.mustNotCall('client should not have connected'));

c.on('error', common.mustCall((error) => {
  // Family autoselection might be skipped if only a single address is returned by DNS.
  const actualError = Array.isArray(error.errors) ? error.errors[0] : error;

  assert.strictEqual(actualError.code, 'ECONNREFUSED');
}, N + 1));

c.on('close', common.mustCall(() => {
  if (disconnectCount++ < N)
    c.connect(common.PORT); // reconnect
}, N + 1));