test/parallel/test-worker-dns-terminate-during-query.js

'use strict';
const common = require('../common');
const { Resolver } = require('dns');
const dgram = require('dgram');
const { Worker, isMainThread } = require('worker_threads');

// Test that Workers can terminate while DNS queries are outstanding.

if (isMainThread) {
  return new Worker(__filename);
}

const socket = dgram.createSocket('udp4');

socket.bind(0, common.mustCall(() => {
  const resolver = new Resolver();
  resolver.setServers([`127.0.0.1:${socket.address().port}`]);
  resolver.resolve4('example.org', common.mustNotCall());
}));

socket.on('message', common.mustCall(() => {
  process.exit();
}));