public void testSkip_iterator() {
    new IteratorTester<Integer>(
        5, MODIFIABLE, newArrayList(2, 3), IteratorTester.KnownOrder.KNOWN_ORDER) {
      @Override
      protected Iterator<Integer> newTargetIterator() {
        return skip(newLinkedHashSet(asList(1, 2, 3)), 1).iterator();
      }
    }.test();
  }

  @GwtIncompatible // slow (~35s)
  public void testSkip_iteratorList() {

        5,
        IteratorFeature.MODIFIABLE,
        Lists.newArrayList(2, 3),
        IteratorTester.KnownOrder.KNOWN_ORDER) {
      @Override
      protected Iterator<Integer> newTargetIterator() {
        Collection<Integer> collection = Sets.newLinkedHashSet();
        Collections.addAll(collection, 1, 2, 3);
        return FluentIterable.from(collection).skip(1).iterator();
      }
    }.test();

    final Set<Set<Integer>> powerSet = powerSet(elements);
    new IteratorTester<Set<Integer>>(6, UNMODIFIABLE, expected, KNOWN_ORDER) {
      @Override
      protected Iterator<Set<Integer>> newTargetIterator() {
        return powerSet.iterator();
      }
    }.test();
  }

  public void testPowerSetIteration_iteratorTester_fast() {
    ImmutableSet<Integer> elements = ImmutableSet.of(1, 2);

    final Set<Set<Integer>> powerSet = powerSet(elements);
    new IteratorTester<Set<Integer>>(6, UNMODIFIABLE, expected, KNOWN_ORDER) {
      @Override
      protected Iterator<Set<Integer>> newTargetIterator() {
        return powerSet.iterator();
      }
    }.test();
  }

  public void testPowerSetIteration_iteratorTester_fast() {
    ImmutableSet<Integer> elements = ImmutableSet.of(1, 2);

            Lists.newLinkedList(values),
            IteratorTester.KnownOrder.UNKNOWN_ORDER) {
          private @Nullable MinMaxPriorityQueue<T> mmHeap;

          @Override
          protected Iterator<T> newTargetIterator() {
            mmHeap = MinMaxPriorityQueue.create(values);
            return mmHeap.iterator();
          }

          @Override
          protected void verify(List<T> elements) {

            Lists.newLinkedList(values),
            IteratorTester.KnownOrder.UNKNOWN_ORDER) {
          private @Nullable MinMaxPriorityQueue<T> mmHeap;

          @Override
          protected Iterator<T> newTargetIterator() {
            mmHeap = MinMaxPriorityQueue.create(values);
            return mmHeap.iterator();
          }

          @Override
          protected void verify(List<T> elements) {

            4, MODIFIABLE, newHashSet(1), IteratorTester.KnownOrder.KNOWN_ORDER) {
          private @Nullable Multimap<String, Integer> multimap;

          @Override
          protected Iterator<Integer> newTargetIterator() {
            Map<String, Integer> map = Maps.newHashMap();
            map.put("foo", 1);
            map.put("bar", 2);
            multimap = Multimaps.forMap(map);

            4, MODIFIABLE, newHashSet(1), IteratorTester.KnownOrder.KNOWN_ORDER) {
          private @Nullable Multimap<String, Integer> multimap;

          @Override
          protected Iterator<Integer> newTargetIterator() {
            Map<String, Integer> map = Maps.newHashMap();
            map.put("foo", 1);
            map.put("bar", 2);
            multimap = Multimaps.forMap(map);