assertEquals(1 << 16, sixtyFiveThousandish.size());

    assertTrue(powerSet(makeSetOfZeroToTwentyNine()).contains(makeSetOfZeroToTwentyNine()));
    assertFalse(powerSet(makeSetOfZeroToTwentyNine()).contains(ImmutableSet.of(30)));
  }

  private static Set<Integer> makeSetOfZeroToTwentyNine() {
    // TODO: use Range once it's publicly available
    Set<Integer> zeroToTwentyNine = newHashSet();