@GwtIncompatible // fairly slow (~50s)
  public void testPartition_general() {
    new IteratorTester<List<Integer>>(
        5,
        IteratorFeature.UNMODIFIABLE,
        ImmutableList.of(asList(1, 2, 3), asList(4, 5, 6), asList(7)),
        IteratorTester.KnownOrder.KNOWN_ORDER) {
      @Override
      protected Iterator<List<Integer>> newTargetIterator() {
        Iterator<Integer> source = Iterators.forArray(1, 2, 3, 4, 5, 6, 7);