public void FilterDigit_8()
        {
            List <int> initialList = new List <int>()
            {
                1, 17, 45, 65, 76, 725, 3, 9, 7, 37
            };
            List <int> expected = new List <int>()
            {
            };
            NumberClass numberClass = new NumberClass();
            List <int>  actual      = numberClass.FilterDigit(initialList, 8);

            CollectionAssert.AreEqual(expected, actual);
        }