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]);
}
