.addEqualityGroup(Predicates.not(isOdd()), Predicates.not(isOdd()))
        .addEqualityGroup(Predicates.not(TRUE))
        .addEqualityGroup(isOdd())
        .testEquals();
  }

  public void testNot_equalityForNotOfKnownValues() {
    new EqualsTester()
        .addEqualityGroup(TRUE, Predicates.alwaysTrue())
        .addEqualityGroup(FALSE)
        .addEqualityGroup(Predicates.not(TRUE))
        .testEquals();