node/test/simple/test-child-process-spawnsync.js

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var common = require('../common');
var assert = require('assert');

var spawnSync = require('child_process').spawnSync;

var TIMER = 100;
var SLEEP = 1000;

var start = Date.now();
var timeout = 0;

setTimeout(function() {
  console.log('timer fired');
  timeout = Date.now();
}, TIMER);

console.log('sleep started');
var ret = spawnSync('sleep', ['1']);
console.log('sleep exited');

process.on('exit', function() {
  assert.strictEqual(ret.status, 0);

  var delta = Date.now() - start;

  var expected_timeout = start + TIMER;
  var tdlta = timeout - expected_timeout;

  assert(delta > SLEEP);
  assert(tdlta > TIMER && tdlta < SLEEP);
});