public void FlattenA3DeepNotification()
{
Notification notification = new Notification();
notification.RegisterMessage("f1", "hello", Severity.Error);
Notification child = new Notification();
child.RegisterMessage("f3", "something", Severity.Warning);
notification.AddChild("f2", child);
Notification grandchild = new Notification();
grandchild.RegisterMessage("f4", "bad", Severity.Error);
child.AddChild("f5", grandchild);
Notification flat = notification.Flatten();
flat.AllMessages.Length.ShouldEqual(3);
}