title: Nightwatch - Get an element which class is duplicated in the DOM
body: <p>I'm running a functional test with NightwatchJs and i got a html similar to this one.</p>
  
  <pre><code>&lt;div&gt;
    &lt;span class="ps-cls"&gt;value 1&lt;/span&gt;
  &lt;/div&gt;
   &lt;div&gt;
    &lt;span class="ps-cls"&gt;value 2&lt;/span&gt;
  &lt;/div&gt;
  </code></pre>
  
  <p>What i need is to get the value of the second span (with value 2).
  I tried with pseudoclass but i couldn't get it.</p>
  
  <p>How can i get that kind of element? (a nodeChild with duplicated class).</p>