title: ClassInitialize attribute in unit test based class not called
body: <p>I added these method in a TestBase class :</p>
  
  <pre><code>[ClassInitialize]
  public static void InitializBeforeAllTests()
  {
  }
  </code></pre>
  
  <p>But when I run in Debug an unit test <code>Test1()</code> :</p>
  
  <pre><code>[TestClass]
  public class TestMapping : TestBase
  {
      [TestMethod]
      public void Test1()
      {
      }
  </code></pre>
  
  <p>The <code>TestBase.InitializBeforeAllTests()</code> method is never called.
  Why?</p>