assertFalse(i.hasNext());
    try {
      i.next();
      fail();
    } catch (NoSuchElementException expected) {
    }
  }

  @GwtIncompatible // too slow for GWT
  public void testPowerSetIteration_iteratorTester() {
    ImmutableSet<Integer> elements = ImmutableSet.of(1, 2);

    Set<Set<Integer>> expected = newLinkedHashSet();