title: How to use correctly filtering on NightwatchJS
body: <p>I'm using <code>src_folders</code> with filter to skip others .js files that don't match my patterns but he is skipping patterns files also:</p>
  
  <p><img src="https://i.imgur.com/VOCJNWH.png" alt="Imgur"></p>
  
  <pre><code>Error: No tests defined! using source folder: test_fixtures
     - using path filter: /*-spec.js
  </code></pre>