public void One_GetItemAfterMeIn_List_Returns_Two()
        {
            var list = GetListZeroThroughThree();

            var actual = one.GetItemAfterMeIn(list);

            Assert.IsTrue(actual == two);
        }
        public void Three_GetItemAfterMeIn_List_Returns_Null()
        {
            var list = GetListZeroThroughThree();

            var actual = three.GetItemAfterMeIn(list);

            Assert.IsNull(actual);
        }
        public void Zero_GetItemAfterMeIn_List_Returns_One()
        {
            var list = GetListZeroThroughThree();

            var actual = zero.GetItemAfterMeIn(list);

            Assert.IsTrue(actual == one);
        }