A comparison of using wd.js with callbacks versus the promises API

promises-vs-callbacks-example.js

// Example of nesting wd.js callbacks
browser.get("http://admc.io/wd/test-pages/guinea-pig.html", function() {
  browser.title(function(err, title) {
    assert.ok(~title.indexOf('I am a page title - Sauce Labs'), 'Wrong title!');
    browser.elementById('i am a link', function(err, el) {
      browser.clickElement(el, function() {
        browser.eval("window.location.href", function(err, href) {
          assert.ok(~href.indexOf('guinea-pig2'));
          browser.quit();
        });
      });
    });
  });
});

// Same example using promises API
browser.get("http://admc.io/wd/test-pages/guinea-pig.html")
  .then(function () {
    return browser.title();
}).then(function (title) {
    assert.ok(~title.indexOf('I am a page title - Sauce Labs'), 'Wrong title!');
    return browser.elementById('i am a link');
}).then(function (el) {
    return browser.clickElement(el);
}).then(function () {
    /* jshint evil: true */
    return browser.eval("window.location.href");
}).then(function (href) {
    assert.ok(~href.indexOf('guinea-pig2'));
}).fin(function () {
    browser.quit();
}).done();