title: How can I suppress "WARN: 'Could not find HammerJS." on each text execution?
body: <p>When executing tests, each test logs the following:</p>
  
  <pre><code>WARN: 'Could not find HammerJS. Certain Angular Material components may not work correctly.'
  </code></pre>
  
  <p>From from <a href="https://material.angular.io/guide/getting-started" rel="nofollow noreferrer">Angular Material Getting Started Guide</a>:</p>
  
  <blockquote>
    <p>Some components (<code>md-slide-toggle</code>, <code>md-slider</code>, <code>mdTooltip</code>) rely on HammerJS for gestures. In order to get the full feature-set of these components, HammerJS must be loaded into the application. </p>
  </blockquote>
  
  <p>Based on that, my conclusion is that I don't need HammerJS installed as I'm not specifically using the Angular Material components that require it. <em>If you don't need it, don't add it!</em></p>
  
  <p>But whilst executing 1000+ tests, having that warning print out each time really isn't helpful and so I want to get rid of it or have it print once only.</p>