if (unsafeComparatorAvailable()) {
      assertThat(Class.forName(unsafeComparatorClassName()))
          .isSameInstanceAs(defaultComparator.getClass());
    } else {
      assertThat(UnsignedBytes.lexicographicalComparatorJavaImpl())
          .isSameInstanceAs(defaultComparator);
    }
  }

  public void testLexicographicalComparator() {
    List<byte[]> ordered =
        Arrays.asList(
            new byte[] {},