* in the given order. Warning: it is not enough to simply pull multiple iterators from the same
   * source Iterable, unless that Iterator is unmodifiable.
   */
  protected abstract I newTargetIterator();

  /**
   * Override this to verify anything after running a list of Stimuli.
   *
   * <p>For example, verify that calls to remove() actually removed the correct elements.
   *

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

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

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

            new LinkedList<>(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) {

            new LinkedList<>(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 = new HashMap<>();
            map.put("foo", 1);
            map.put("bar", 2);
            multimap = Multimaps.forMap(map);