title: Mocha expect does not behave as expected
body: <p>Just noticed something which I find a little strange, the following passes</p>
  <pre><code>expect(driver.getCurrentUrl()).to.eventually.contain('Home/Selection/CH')
  </code></pre>
  <p>even though the current URL is <a href="http://www.someurl.com/Home/Selection/XX" rel="nofollow noreferrer">www.someurl.com/Home/Selection/XX</a> and there does not contain Home/Selection/CH</p>
  <p>Why is this?</p>