title: Can't add a reference to EntityFramework in my unit test project
body: <p>I have a new project happily using Entity Framework 5. After I added the edmx to the solution, it added a reference to EntityFramework version 5.</p>
  
  <p>I created a unit test project, and I need to use something from the EntityFramework library. However, there is no reference to EntityFramework. When I go to Add Reference, I cannot find it anywhere in the list.</p>
  
  <p>I've checked and my unit test is referencing .NET 4.5. Any idea why I can't add the reference?</p>