node/test/parallel/test-child-process-fork-ref2.js

// Copyright Joyent, Inc. and other Node contributors.
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'use strict';
const {
  mustCall,
  mustNotCall,
  platformTimeout,
} = require('../common');
const fork = require('child_process').fork;
const debug = require('util').debuglog('test');

if (process.argv[2] === 'child') {
  debug('child -> call disconnect');
  process.disconnect();

  setTimeout(() => {
    debug('child -> will this keep it alive?');
    process.on('message', mustNotCall());
  }, platformTimeout(400));

} else {
  const child = fork(__filename, ['child']);

  child.on('disconnect', mustCall(() => {
    debug('parent -> disconnect');
  }));

  child.once('exit', mustCall(() => {
    debug('parent -> exit');
  }));
}