input = Arrays.copyOf(input, input.length);
    UnsignedInts.sort(input, from, to);
    assertThat(input).isEqualTo(expected);
  }

  public void testSortIndexed() {
    testSort(new int[] {}, 0, 0, new int[] {});
    testSort(new int[] {2}, 0, 1, new int[] {2});
    testSort(new int[] {2, 1, 0}, 0, 2, new int[] {1, 2, 0});

    input = Arrays.copyOf(input, input.length);
    UnsignedBytes.sort(input, from, to);
    assertThat(input).isEqualTo(expected);
  }

  public void testSortIndexed() {
    testSort(new byte[] {}, 0, 0, new byte[] {});
    testSort(new byte[] {2}, 0, 1, new byte[] {2});
    testSort(new byte[] {2, 1, 0}, 0, 2, new byte[] {1, 2, 0});