public void AddTwoLists_WithContentsInterlaced() { //Arrange CustomList <int> numbersList1 = new CustomList <int>(); numbersList1.AddItem(24); numbersList1.AddItem(30); CustomList <int> numbersList2 = new CustomList <int>(); numbersList2.AddItem(2); numbersList2.AddItem(1); CustomList <int> finalList = new CustomList <int>(); int expected = 4; //Act finalList.ZipTwoLists(numbersList1, numbersList2); //Assert Assert.AreEqual(expected, finalList.Count); }