Set<Object> sumToQuarterMaxIntElements =
        newHashSet(objectWithHashCode(1 << 30), objectWithHashCode(0));
    assertPowerSetHashCode(1 << 31, sumToQuarterMaxIntElements);
  }

  public void testPowerSetShowOff() {
    Set<Object> zero = ImmutableSet.of();
    Set<Set<Object>> one = powerSet(zero);
    Set<Set<Set<Object>>> two = powerSet(one);
    Set<Set<Set<Set<Object>>>> four = powerSet(two);