title: TestNG equivalent of assertEmpty?
body: <p>When I want to test whether a returned collection is empty, I found no elegant solution.</p>
  
  <pre><code>assertTrue(service.getSomeEntries(params).isEmpty())
  </code></pre>
  
  <p>This approach works, the downside being that it loses any information of the data.</p>
  
  <pre><code>assertEquals(new LinkedHashSet&lt;&gt;(service.getSth()), Collections.emptySet())
  </code></pre>
  
  <p>This approach kinda works, it doesn't even change the order. But there is some boilerplate. If this assertion fails, it only shows that the size differs. Better than nothing, but could be better.</p>
  
  <p>Is there any elegant solution to this problem? I don't have any requirements defined, I just want something that fulfills at least one of the following points:</p>
  
  <ul>
  <li>The code is more ellegant with less boilerplate.</li>
  <li>It provides more information on what lies inside the collection when it's not empty. (This can be obviously achieved by saving the collection outside the assertion and putting it to the text explanation of what went wrong, but is there a way to do it with just an assertion?)</li>
  </ul>