public void DifferencingDetectsRemoveAsRemove()
{
var model = new Model();
var lisa = new Female {
FullName = "Lisa Simpson"
};
AddSimpsons(model, lisa);
var copy = Copy(model);
lisa.Delete();
var diff = GetDiff <IModel>(copy, model);
Assert.AreEqual(1, diff.Changes.Count);
var delete = diff.Changes.OfType <CompositionListDeletion>().FirstOrDefault();
Assert.IsNotNull(delete);
Assert.AreEqual("Lisa Simpson", (delete.DeletedElement as IFemale).FullName);
}