if (unsafeComparatorAvailable()) {
      assertThat(defaultComparator).isInstanceOf(UnsafeComparator.class);
    } else {
      assertThat(defaultComparator).isEqualTo(UnsignedBytes.lexicographicalComparatorJavaImpl());
    }
  }

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