title: Visual studio test runner - criteria is filtering all tests
body: <p>Using VS 2013 and TFS 2013, I have 4 unit tests but I want a TFS build to run only one of them. For this I have assigned <code>[TestCategory("bvt")]</code> as an attribute of the method.</p>
  
  <p><img src="https://i.stack.imgur.com/zcFcZ.png" alt="enter image description here"></p>
  
  <p>I edit the build definition, and within the "Add/Edit Test Run" dialog I give a value for "Test case filter:" of "TestCategory=bvt"</p>
  
  <p><img src="https://i.stack.imgur.com/ul9Ax.png" alt="enter image description here"></p>
  
  <p>With the filter added, no tests are executed. If I remove the filter then a team build using "ReleaseTfvcTemplate.12.xaml" result in all 4 tests being executed.
  I've tried wrapping the filter in quotes etc but haven't been able to get it to work - where am I going wrong?</p>