public void DeriveWithSelectorInsertTwo() { var list = new RxList<string>("2"); var derived = list.Derive(x => int.Parse(x)); list.InsertRange(new[] { new RxListItem<string>(0, "1"), new RxListItem<string>(1, "3") }); Assert.AreEqual(1, derived[0]); Assert.AreEqual(2, derived[1]); Assert.AreEqual(3, derived[2]); }