title: Can't scroll when testing using intern.js
body: <p>I use <code>moveMouseTo</code> but it doesn't seem to work. This is my code. Does anyone able to see what is wrong with it? The assert should work and not return error, because if you try to scroll down the page at <code>www.keylocation.sg</code>, it will shows a navigation bar. </p>
  
  <p>Thanks before.</p>
  
  <pre><code>define([
    'intern!object',
    'intern/chai!assert',
    './util',
    'intern/dojo/node!fs'
  ], function(registerSuite, assert, util, fs) {
  
    var suite = {
      name: 'home-navbar',
      afterEach: util.checkJSErrors,
  
      // testing the visibility of navigation bar in the home page
      'Home page navigation bar: navigation bar visibility': function() {
        var remote = this.remote
          .setWindowSize(1024, 768)
          .get('about:blank')
          .get('https://www.keylocation.sg');
        this.timeout = 300000;
        return remote
          // check: Home page loads, navbar is not visible
          .findById('header-menu').isDisplayed().then(assert.isFalse).end()
          // check: Scroll down to next page, navbar becomes visible
          .moveMouseTo(0,1000).end()
          .findById('header-menu').isDisplayed().then(assert.isTrue).end();
      }
    };
  
    registerSuite(suite);
  
  });
  </code></pre>