.addEqualityGroup(Collections.reverseOrder())
        .testEquals();
  }

  public void testReverseOfReverseSameAsForward() {
    // Not guaranteed by spec, but it works, and saves us from testing
    // exhaustively
    assertSame(numberOrdering, numberOrdering.reverse().reverse());
  }

  private enum StringLengthFunction implements Function<String, Integer> {
    StringLength;

        .addEqualityGroup(Collections.reverseOrder())
        .testEquals();
  }

  public void testReverseOfReverseSameAsForward() {
    // Not guaranteed by spec, but it works, and saves us from testing
    // exhaustively
    assertSame(numberOrdering, numberOrdering.reverse().reverse());
  }

  private enum StringLengthFunction implements Function<String, Integer> {
    StringLength;