public void IndexOfItems() { var list = new ListHistory <string> { "a", "b", "c", "d", "e", "f", }; Assert.AreEqual(0, list.IndexOf("a")); Assert.AreEqual(1, list.IndexOf("b")); Assert.AreEqual(2, list.IndexOf("c")); Assert.AreEqual(3, list.IndexOf("d")); Assert.AreEqual(4, list.IndexOf("e")); Assert.AreEqual(5, list.IndexOf("f")); }