private static void Assert_root_breadcrumb_values(Breadcrumb breadcrumb)
{
breadcrumb.ShouldNotBeNull();
breadcrumb.DisplayString.ShouldBe("ROOT");
breadcrumb.ItemTypesShouldBe<L0>();
breadcrumb.Parent.ShouldBeNull();
breadcrumb.Path.ShouldBeNull();
breadcrumb.PropertiesShouldBeNull();
}