public void Test_HowManyDuplicates()
        {
            int[]  dups     = { 1, 3, 5, 1, 4, 5, 2, 4, 3, 5, 3, 1 };
            string expected = "1 -> 3x \n"
                              + "2 -> 1x \n"
                              + "3 -> 3x \n"
                              + "4 -> 2x \n"
                              + "5 -> 3x \n";

            Assert.Equal(expected, HowManyDuplicates.duplicate(dups));
        }
        public void Duplicates()
        {
            int[] dups = { 1, 3, 5, 1, 4, 5, 2, 4, 3, 5, 3, 1 };

            string hasil = "1 -> 3x \n"
                           + "2 -> 1x \n"
                           + "3 -> 3x \n"
                           + "4 -> 2x \n"
                           + "5 -> 3x \n";

            Assert.Equal(hasil, HowManyDuplicates.duplicate(dups));
        }