Isolate.Verify.NonPublic.WasNotCalled() does not throw an ex

[TestClass, Isolated]
public class Tests
{
   public class A
   {
      public void AMethod()
      {
      }
   }

   [TestMethod]
   public void Test()
   {
      A a = Isolate.Fake.Instance<A>(Members.CallOriginal);
      a.AMethod();
      Isolate.Verify.NonPublic.WasNotCalled(a, "NonExistentMethod");
   }
}