public void TestClassMessaging()
{
Id str = ObjectiveCRuntime.SendMessage<Id>(this.cls_NSString, "stringWithUTF8String:", "AbCdEfGhIjKlMnOpQrStUvWxYz");
Assert.AreNotEqual(IntPtr.Zero, str, "String creation cannot failed");
bool test = ObjectiveCRuntime.SendMessage<bool>(str, "isKindOfClass:", Class.Get("NSString"));
Assert.IsTrue(test, "String should be of the right class.");
}