title: Laravel Unit Testing, how to "seeInDatabase" soft deleted row?
body: <p>I'm working on a small unit test where I soft delete a row. To mark the test as successful I have to find that row with:</p>
  <ul>
  <li>a given ID and</li>
  <li><code>deleted_at</code> column <strong>should not be</strong> null.</li>
  </ul>
  <p>I can fulfil first condition - because obviously I know the ID.</p>
  <p>Unfortunately I don't know how to tell <code>seeInDatabase</code> method that I expect <code>deleted_at</code> <strong>not to be</strong> null:</p>
  <pre><code>$this-&gt;seeInDatabase(
         'diary_note_categories',
         [
             'id' =&gt; 'a7e35ad0-6f00-4f88-b953-f498797042fc',
             'deleted_at' =&gt; null // should be is not null, like &lt;&gt; or != or whatever
         ]
   );
  </code></pre>
  <p>Any hints?</p>
  <p><code>'deleted_at &lt;&gt;' =&gt; null</code> <em>breaks</em></p>
  <p><code>'deleted_at' =&gt; ['!=' =&gt; null]</code> <em>breaks as well</em></p>