title: How to assert that all selected properties are set (not null or empty)
body: <p>I want to verify (assert) that certain properties on my DTO object are set.
  I was trying to do it with Fluent Assertions, but the following code does not seem to work:</p>
  
  <pre><code>mapped.ShouldHave().Properties(
      x =&gt; x.Description,
      ...more
      x =&gt; x.Id)
      .Should().NotBeNull(); 
  </code></pre>
  
  <p>Is it possible to achieve that with Fluent Assertions, or other tool ?
  Fluent assertions have ShouldBeEquivalentTo, but actually I only care whether those are not nulls/empties, so that one I was not able to utilize.</p>
  
  <p>Of course I can just do an Assert on each property level, but interested in some more elegant way.</p>