title: TFS visual studio test "Test Filter criteria" and xunit Traits
body: <p>I'm trying to filter out some unit test marked with the xunit trait category. On my build server I don't want unit test to run with category <em>integration</em></p>
  
  <pre><code> [Trait("Category", "Integration")]
  </code></pre>
  
  <p>When I don't use the 'Test Filter criteria' in TFS VS test step, the unit test all get executed. But when I apply the desired filter </p>
  
  <pre><code>Category!=Integration
  </code></pre>
  
  <p>It doesn't run any tests at all. I've tried all variations but no success. I also tried using the 2.* version of the test task.</p>