public void IndexOfForTwoTest()
        {
            var list = new ListOnGenerics <int>();

            list.Add(32);
            list.Add(8);
            Assert.AreEqual(0, list.IndexOf(32));
            Assert.AreEqual(1, list.IndexOf(8));
        }
        public void WrongIndexOfTest()
        {
            var list = new ListOnGenerics <int>();

            list.Add(32);
            list.Add(8);
            Assert.AreEqual(-1, list.IndexOf(0));
        }