public void TestMethodInsertionSortByDescending()
 {
     int[] arr    = { 31, 41, 59, 26, 41, 58 };
     int[] result = InsertionSort.DescendingSort(arr);
     CollectionAssert.AreEqual(result, new int[] { 59, 58, 41, 41, 31, 26 });
 }