title: Inheriting test methods across projects
body: <p>I'm trying to have a test class for the VS test framework, that is derived from another test class and inherits all its test methods (so that each appears twice). This was suggested in <a href="https://stackoverflow.com/a/22641778/1609722">a comment on another ticket</a>. </p>
  
  <p>When this is done within the same project, it works fine. When done across projects, everything compiles fine but the new tests don't show up.</p>
  
  <p>In this <a href="https://drive.google.com/file/d/1xtRcoR9v5dloTCKUyQ-JoS2EV3HrtKVS/view?usp=sharing" rel="nofollow noreferrer">minimal solution</a>, the problem is demonstrated. Two projects, in each we derive from the same base class in the first project. But the new (duplicate) tests only show up for the same-project child class. </p>
  
  <p>I suspect something is optimized away in someway, but don't know what or how top debug this. I tried adding a dummy TestMethod to the second-project test class, just so that something must happen with the class - then only this test method shows, without the derived methods. Suggestions would be appreciated.</p>