@GwtIncompatible // SerializableTester
  public void testLexicographicalComparatorSerializable() {
    Comparator<char[]> comparator = Chars.lexicographicalComparator();
    assertThat(SerializableTester.reserialize(comparator)).isSameInstanceAs(comparator);
  }

  public void testReverse() {
    testReverse(new char[] {}, new char[] {});
    testReverse(new char[] {'1'}, new char[] {'1'});