node/test/simple/test-timers-first-fire.js

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

var TIMEOUT = 50;
var last = process.hrtime();
setTimeout(function() {
  var hr = process.hrtime(last);
  var ms = (hr[0] * 1e3) + (hr[1] / 1e6);
  var delta = ms - TIMEOUT;
  console.log('timer fired in', delta);
  assert.ok(delta > 0, 'Timer fired early');
}, TIMEOUT);