public void AddIntegersToStartOfList_PrependsToList()
        {
            // Arrange
            var linkList = new SinglyLinkList();

            int[] values   = { 0, -1, 5, 10 };
            int[] expected = values.Reverse().ToArray();

            // Act
            for (int i = 0; i < values.Length; i++)
            {
                linkList.AddToHead(values[i]);
            }

            // Assert
            int[] result = linkList.GetValues;
            Assert.Equal(expected, result);
        }