public void testEveryMapShape() {
   assertCountSum(
       StreamSupport.stream(countTo(1000))
           .mapToInt(i -> i - 1)
           .mapToObj(i -> i + 1)
           .mapToLong(i -> i - 1)
           .mapToObj(i -> i + 1)
           .mapToDouble(i -> i - 1)
           .mapToObj(i -> i + 1)
           .mapToInt(i -> (int) (double) i)
           .mapToLong(i -> i)
           .mapToDouble(i -> i)
           .mapToLong(i -> (long) i)
           .mapToInt(i -> (int) i)
           .mapToObj(i -> i),
       1000,
       StreamSupport.stream(countTo(1000)).mapToInt(i -> i).sum());
 }
  public void testMap() {
    assertCountSum(StreamSupport.stream(countTo(0)).map(mId), 0, 0);
    assertCountSum(StreamSupport.stream(countTo(10)).map(mId), 10, 55);
    assertCountSum(StreamSupport.stream(countTo(10)).map(mZero), 10, 0);
    assertCountSum(StreamSupport.stream(countTo(0)).map(mDoubler), 0, 0);
    assertCountSum(StreamSupport.stream(countTo(10)).map(mDoubler), 10, 110);
    assertCountSum(StreamSupport.stream(countTo(10)).map(mDoubler).map(mDoubler), 10, 220);

    exerciseOps(countTo(0), s -> s.map(LambdaTestHelpers.identity()), countTo(0));
    exerciseOps(countTo(1000), s -> s.map(LambdaTestHelpers.identity()), countTo(1000));
    // @@@ Force cast to integer so output is Stream<Integer> rather an IntStream
    //     this just ensures that no warnings are logged about boxing
    //     when the result is compared with the output
    exerciseOps(countTo(1000), s -> s.map(e -> (Integer) (1000 + e)), range(1001, 2000));
  }
  static {
    {
      List<Object[]> list = new ArrayList<>();
      for (Object[] data : arrays) {
        final Object name = data[0];
        final Integer[] ints = (Integer[]) data[1];
        final List<Integer> intsAsList = Arrays.asList(ints);

        list.add(arrayDataDescr("array:" + name, ints));
        list.add(collectionDataDescr("ArrayList.asList:" + name, intsAsList));
        list.add(collectionDataDescr("ArrayList:" + name, new ArrayList<>(intsAsList)));
        list.add(
            streamDataDescr(
                "DelegatingStream(ArrayList):" + name,
                () ->
                    StreamSupport.stream(
                        new ArrayList<>(
                            intsAsList) /*, new ArrayList<>().spliterator().characteristics()*/)));

        List<Integer> aList = new ArrayList<>(intsAsList);
        if (LambdaTestMode.isNormalMode()) {
          // Only include sub-lists for normal test execution mode
          // This data is serialization-hostile since the state of the
          // deserialized sub-list will be out of sync with the
          // enclosing list.
          list.add(
              collectionDataDescr(
                  "ArrayList.Sublist:" + name,
                  (ints.length) <= 1 ? aList.subList(0, 0) : aList.subList(1, ints.length / 2)));
        }
        list.add(collectionDataDescr("LinkedList:" + name, new LinkedList<>(intsAsList)));
        list.add(collectionDataDescr("HashSet:" + name, new HashSet<>(intsAsList)));
        list.add(collectionDataDescr("LinkedHashSet:" + name, new LinkedHashSet<>(intsAsList)));
        list.add(collectionDataDescr("TreeSet:" + name, new TreeSet<>(intsAsList)));
        SpinedBuffer<Integer> spinedBuffer = new SpinedBuffer<>();
        java8.lang.Iterables.forEach(intsAsList, spinedBuffer);
        list.add(sbDataDescr("SpinedBuffer:" + name, spinedBuffer));

        // @@@ Add more
      }
      testData = list.toArray(new Object[0][]);
    }

    // Simple combination of numbers and null values, probably excessive but may catch
    // errors for initialization/termination/sequence
    // @@@ This is separate from the other data for now until nulls are consistently supported by
    // all operations
    {
      List<Object[]> list = new ArrayList<>();
      int size = 5;
      for (int i = 0; i < (1 << size) - 2; i++) {
        Integer[] content = new Integer[size];
        for (int e = 0; e < size; e++) {
          content[e] = (i & (1 << e)) > 0 ? e + 1 : null;
        }

        // ORDERED
        list.add(arrayDataDescr("array(with null):" + i, content));
        // not ORDERED, DISTINCT
        list.add(
            collectionDataDescr("HashSet(with null):" + i, new HashSet<>(Arrays.asList(content))));
      }

      withNullTestData = list.toArray(new Object[0][]);
    }

    {
      List<Object[]> spliterators = new ArrayList<>();
      for (Object[] data : arrays) {
        final Object name = data[0];
        final Integer[] ints = (Integer[]) data[1];

        spliterators.add(
            splitDescr("Arrays.s(array):" + name, () -> java8.util.J8Arrays.spliterator(ints)));
        spliterators.add(
            splitDescr(
                "arrays.s(array,o,l):" + name,
                () -> java8.util.J8Arrays.spliterator(ints, 0, ints.length / 2)));
        spliterators.add(
            splitDescr(
                "SpinedBuffer.s():" + name,
                () -> {
                  SpinedBuffer<Integer> sb = new SpinedBuffer<>();
                  for (Integer i : ints) sb.accept(i);
                  return sb.getSpliterator();
                }));
        spliterators.add(
            splitDescr(
                "Iterators.s(Arrays.s(array).iterator(), size):" + name,
                () -> Spliterators.spliterator(Arrays.asList(ints).iterator(), ints.length, 0)));
        spliterators.add(
            splitDescr(
                "Iterators.s(Arrays.s(array).iterator()):" + name,
                () -> Spliterators.spliteratorUnknownSize(Arrays.asList(ints).iterator(), 0)));
        // @@@ Add map and collection spliterators when spliterator() is exposed on Collection or
        // Iterable
      }
      spliteratorTestData = spliterators.toArray(new Object[0][]);
    }
  }
 public Stream<Pair<String, Function<Command, Observable<Event>>>> parallelStream() {
   return StreamSupport.stream(spliterator(), true);
 }