private void SortTest(INumberSorter numberSorter)
 {
     int[] arr      = new int[] { 3, 5, 6, 2, 1, 4, 8, 10, 7, 9 };
     int[] expected = new int[] { 1, 2, 3, 4, 5, 6, 7, 8, 9, 10 };
     numberSorter.Sort(arr);
     for (int i = 0; i < arr.Length; i++)
     {
         Assert.AreEqual(expected[i], arr[i]);
     }
 }
 private void NullTest(INumberSorter numberSorter)
 {
     int[] arr = null;
     try
     {
         numberSorter.Sort(arr);
         Assert.Fail();
     }
     catch (ArgumentNullException)
     {
     }
 }
 private void EmptyTest(INumberSorter numberSorter)
 {
     int[] arr = new int[0];
     numberSorter.Sort(arr);
 }