public void FindDiscriminatorsBelow_FindsDistinctDiscriminators()
        {
            ContentItem root  = CreateOneItem <PersistableItem>(0, "root", null);
            ContentItem child = CreateOneItem <PersistableItem>(0, "item", root);

            repository.Save(root);

            repository.FindDescendantDiscriminators(root).Single().Discriminator
            .ShouldBe("PersistableItem");
        }