test/parallel/test-cluster-worker-init.js

// Copyright Joyent, Inc. and other Node contributors.
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'use strict';
// test-cluster-worker-init.js
// verifies that, when a child process is forked, the cluster.worker
// object can receive messages as expected

const common = require('../common');
const assert = require('assert');
const cluster = require('cluster');
const msg = 'foo';

if (cluster.isPrimary) {
  const worker = cluster.fork();

  worker.on('message', common.mustCall((message) => {
    assert.strictEqual(message, true);
    const w = worker.disconnect();
    assert.strictEqual(worker, w);
  }));

  worker.on('online', () => {
    worker.send(msg);
  });
} else {
  // https://github.com/nodejs/node-v0.x-archive/issues/7998
  cluster.worker.on('message', (message) => {
    process.send(message === msg);
  });
}