node/test/parallel/test-process-uptime.js

// Copyright Joyent, Inc. and other Node contributors.
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//
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'use strict';
require('../common');
const assert = require('assert');

console.error(process.uptime());
// Add some wiggle room for different platforms.
// Verify that the returned value is in seconds -
// 15 seconds should be a good estimate.
assert.ok(process.uptime() <= 15);

const original = process.uptime();

setTimeout(function() {
  const uptime = process.uptime();
  assert.ok(original < uptime);
}, 10);