node/test/parallel/test-child-process-fork-and-spawn.js

var common = require('../common');
var assert = require('assert');
var spawn = require('child_process').spawn;
var fork = require('child_process').fork;

// Fork, then spawn. The spawned process should not hang.
switch (process.argv[2] || '') {
case '':
  fork(__filename, ['fork']).on('exit', checkExit);
  process.on('exit', haveExit);
  break;
case 'fork':
  spawn(process.execPath, [__filename, 'spawn']).on('exit', checkExit);
  process.on('exit', haveExit);
  break;
case 'spawn':
  break;
default:
  assert(0);
}

var seenExit = false;

function checkExit(statusCode) {
  seenExit = true;
  assert.equal(statusCode, 0);
  process.nextTick(process.exit);
}

function haveExit() {
  assert.equal(seenExit, true);
}