nodejs/test/parallel/test-cluster-worker-forced-exit.js

// Copyright Joyent, Inc. and other Node contributors.
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'use strict';
const common = require('../common');
const assert = require('assert');
const cluster = require('cluster');

const SENTINEL = 42;

// Workers forcibly exit when control channel is disconnected, if
// their .exitedAfterDisconnect flag isn't set
//
// test this by:
//
// 1 setup worker to wait a short time after disconnect, and exit
//   with a sentinel value
// 2 disconnect worker with cluster's disconnect, confirm sentinel
// 3 disconnect worker with child_process's disconnect, confirm
//   no sentinel value
if (cluster.isWorker) {
  process.on('disconnect', (msg) => {
    setTimeout(() => process.exit(SENTINEL), 10);
  });
  return;
}

checkUnforced();
checkForced();

function checkUnforced() {
  const worker = cluster.fork();
  worker
    .on('online', common.mustCall(() => worker.disconnect()))
    .on('exit', common.mustCall((status) => {
      assert.strictEqual(status, SENTINEL);
    }));
}

function checkForced() {
  const worker = cluster.fork();
  worker
    .on('online', common.mustCall(() => worker.process.disconnect()))
    .on('exit', common.mustCall((status) => assert.strictEqual(status, 0)));
}