public void ctor()
 {
     using (var obj = new DerivedDisposableObject())
     {
         Assert.IsAssignableFrom<DisposableObject>(obj);
     }
 }
 public void ctor()
 {
     using (var obj = new DerivedDisposableObject())
     {
         Assert.IsAssignableFrom <DisposableObject>(obj);
     }
 }