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root/jsr166/jsr166/src/test/tck/Collection8Test.java

Comparing jsr166/src/test/tck/Collection8Test.java (file contents):
Revision 1.23 by jsr166, Mon Nov 14 21:33:58 2016 UTC vs.
Revision 1.59 by jsr166, Tue Apr 30 00:50:31 2019 UTC

#	Line 8 | Line 8
8		import static java.util.concurrent.TimeUnit.HOURS;
9		import static java.util.concurrent.TimeUnit.MILLISECONDS;
10
11	+	import java.util.ArrayDeque;
12		import java.util.ArrayList;
13		import java.util.Arrays;
14		import java.util.Collection;
15		import java.util.Collections;
16	+	import java.util.ConcurrentModificationException;
17		import java.util.Deque;
18		import java.util.HashSet;
19		import java.util.Iterator;
20		import java.util.List;
21		import java.util.NoSuchElementException;
22		import java.util.Queue;
23	+	import java.util.Set;
24		import java.util.Spliterator;
25		import java.util.concurrent.BlockingDeque;
26		import java.util.concurrent.BlockingQueue;
27	+	import java.util.concurrent.ConcurrentLinkedQueue;
28		import java.util.concurrent.CountDownLatch;
29		import java.util.concurrent.Executors;
30		import java.util.concurrent.ExecutorService;
31		import java.util.concurrent.Future;
32	+	import java.util.concurrent.Phaser;
33		import java.util.concurrent.ThreadLocalRandom;
34		import java.util.concurrent.atomic.AtomicBoolean;
35		import java.util.concurrent.atomic.AtomicLong;
36		import java.util.concurrent.atomic.AtomicReference;
37		import java.util.function.Consumer;
38		import java.util.function.Predicate;
39	+	import java.util.stream.Collectors;
40
41		import junit.framework.Test;
42
#	Line 55 | Line 61 | public class Collection8Test extends JSR
61
62		Object bomb() {
63		return new Object() {
64	<	public boolean equals(Object x) { throw new AssertionError(); }
65	<	public int hashCode() { throw new AssertionError(); }
66	<	};
64	>	@Override public boolean equals(Object x) { throw new AssertionError(); }
65	>	@Override public int hashCode() { throw new AssertionError(); }
66	>	@Override public String toString() { throw new AssertionError(); }
67	>	};
68		}
69
70		/** Checks properties of empty collections. */
71	<	public void testEmptyMeansEmpty() throws InterruptedException {
71	>	public void testEmptyMeansEmpty() throws Throwable {
72		Collection c = impl.emptyCollection();
73		emptyMeansEmpty(c);
74
75	<	if (c instanceof java.io.Serializable)
76	<	emptyMeansEmpty(serialClone(c));
75	>	if (c instanceof java.io.Serializable) {
76	>	try {
77	>	emptyMeansEmpty(serialClonePossiblyFailing(c));
78	>	} catch (java.io.NotSerializableException ex) {
79	>	// excusable when we have a serializable wrapper around
80	>	// a non-serializable collection, as can happen with:
81	>	// Vector.subList() => wrapped AbstractList$RandomAccessSubList
82	>	if (testImplementationDetails
83	>	&& (! c.getClass().getName().matches(
84	>	"java.util.Collections.*")))
85	>	throw ex;
86	>	}
87	>	}
88
89		Collection clone = cloneableClone(c);
90		if (clone != null)
#	Line 77 | Line 95 | public class Collection8Test extends JSR
95		assertTrue(c.isEmpty());
96		assertEquals(0, c.size());
97		assertEquals("[]", c.toString());
98	+	if (c instanceof List<?>) {
99	+	List x = (List) c;
100	+	assertEquals(1, x.hashCode());
101	+	assertEquals(x, Collections.emptyList());
102	+	assertEquals(Collections.emptyList(), x);
103	+	assertEquals(-1, x.indexOf(impl.makeElement(86)));
104	+	assertEquals(-1, x.lastIndexOf(impl.makeElement(99)));
105	+	assertThrows(
106	+	IndexOutOfBoundsException.class,
107	+	() -> x.get(0),
108	+	() -> x.set(0, impl.makeElement(42)));
109	+	}
110	+	else if (c instanceof Set<?>) {
111	+	assertEquals(0, c.hashCode());
112	+	assertEquals(c, Collections.emptySet());
113	+	assertEquals(Collections.emptySet(), c);
114	+	}
115		{
116		Object[] a = c.toArray();
117		assertEquals(0, a.length);
#	Line 125 | Line 160 | public class Collection8Test extends JSR
160		}
161		if (c instanceof BlockingQueue) {
162		BlockingQueue q = (BlockingQueue) c;
163	<	assertNull(q.poll(0L, MILLISECONDS));
163	>	assertNull(q.poll(randomExpiredTimeout(), randomTimeUnit()));
164		}
165		if (c instanceof BlockingDeque) {
166		BlockingDeque q = (BlockingDeque) c;
167	<	assertNull(q.pollFirst(0L, MILLISECONDS));
168	<	assertNull(q.pollLast(0L, MILLISECONDS));
167	>	assertNull(q.pollFirst(randomExpiredTimeout(), randomTimeUnit()));
168	>	assertNull(q.pollLast(randomExpiredTimeout(), randomTimeUnit()));
169		}
170		}
171
#	Line 147 | Line 182 | public class Collection8Test extends JSR
182		() -> c.iterator().forEachRemaining(null),
183		() -> c.spliterator().forEachRemaining(null),
184		() -> c.spliterator().tryAdvance(null),
185	<	() -> c.toArray(null));
185	>	() -> c.toArray((Object[])null));
186
187		if (!impl.permitsNulls()) {
188		assertThrows(
#	Line 175 | Line 210 | public class Collection8Test extends JSR
210		BlockingQueue q = (BlockingQueue) c;
211		assertThrows(
212		NullPointerException.class,
213	<	() -> {
214	<	try { q.offer(null, 1L, HOURS); }
180	<	catch (InterruptedException ex) {
181	<	throw new AssertionError(ex);
182	<	}},
183	<	() -> {
184	<	try { q.put(null); }
185	<	catch (InterruptedException ex) {
186	<	throw new AssertionError(ex);
187	<	}});
213	>	() -> q.offer(null, 1L, HOURS),
214	>	() -> q.put(null));
215		}
216		if (c instanceof BlockingDeque) {
217		BlockingDeque q = (BlockingDeque) c;
218		assertThrows(
219		NullPointerException.class,
220	<	() -> {
221	<	try { q.offerFirst(null, 1L, HOURS); }
222	<	catch (InterruptedException ex) {
223	<	throw new AssertionError(ex);
197	<	}},
198	<	() -> {
199	<	try { q.offerLast(null, 1L, HOURS); }
200	<	catch (InterruptedException ex) {
201	<	throw new AssertionError(ex);
202	<	}},
203	<	() -> {
204	<	try { q.putFirst(null); }
205	<	catch (InterruptedException ex) {
206	<	throw new AssertionError(ex);
207	<	}},
208	<	() -> {
209	<	try { q.putLast(null); }
210	<	catch (InterruptedException ex) {
211	<	throw new AssertionError(ex);
212	<	}});
220	>	() -> q.offerFirst(null, 1L, HOURS),
221	>	() -> q.offerLast(null, 1L, HOURS),
222	>	() -> q.putFirst(null),
223	>	() -> q.putLast(null));
224		}
225		}
226
#	Line 237 | Line 248 | public class Collection8Test extends JSR
248		() -> d.pop(),
249		() -> d.descendingIterator().next());
250		}
251	+	if (c instanceof List) {
252	+	List x = (List) c;
253	+	assertThrows(
254	+	NoSuchElementException.class,
255	+	() -> x.iterator().next(),
256	+	() -> x.listIterator().next(),
257	+	() -> x.listIterator(0).next(),
258	+	() -> x.listIterator().previous(),
259	+	() -> x.listIterator(0).previous());
260	+	}
261		}
262
263		public void testRemoveIf() {
#	Line 291 | Line 312 | public class Collection8Test extends JSR
312		switch (rnd.nextInt(4)) {
313		case 0: survivors.addAll(c); break;
314		case 1: survivors.addAll(Arrays.asList(c.toArray())); break;
315	<	case 2: c.forEach(e -> survivors.add(e)); break;
315	>	case 2: c.forEach(survivors::add); break;
316		case 3: for (Object e : c) survivors.add(e); break;
317		}
318		assertTrue(orig.containsAll(accepts));
#	Line 328 | Line 349 | public class Collection8Test extends JSR
349		}
350
351		/**
352	+	* All elements removed in the middle of CONCURRENT traversal.
353	+	*/
354	+	public void testElementRemovalDuringTraversal() {
355	+	Collection c = impl.emptyCollection();
356	+	ThreadLocalRandom rnd = ThreadLocalRandom.current();
357	+	int n = rnd.nextInt(6);
358	+	ArrayList copy = new ArrayList();
359	+	for (int i = 0; i < n; i++) {
360	+	Object x = impl.makeElement(i);
361	+	copy.add(x);
362	+	c.add(x);
363	+	}
364	+	ArrayList iterated = new ArrayList();
365	+	ArrayList spliterated = new ArrayList();
366	+	Spliterator s = c.spliterator();
367	+	Iterator it = c.iterator();
368	+	for (int i = rnd.nextInt(n + 1); --i >= 0; ) {
369	+	assertTrue(s.tryAdvance(spliterated::add));
370	+	if (rnd.nextBoolean()) assertTrue(it.hasNext());
371	+	iterated.add(it.next());
372	+	}
373	+	Consumer alwaysThrows = e -> { throw new AssertionError(); };
374	+	if (s.hasCharacteristics(Spliterator.CONCURRENT)) {
375	+	c.clear();          // TODO: many more removal methods
376	+	if (testImplementationDetails
377	+	&& !(c instanceof java.util.concurrent.ArrayBlockingQueue)) {
378	+	if (rnd.nextBoolean())
379	+	assertFalse(s.tryAdvance(alwaysThrows));
380	+	else
381	+	s.forEachRemaining(alwaysThrows);
382	+	}
383	+	if (it.hasNext()) iterated.add(it.next());
384	+	if (rnd.nextBoolean()) assertIteratorExhausted(it);
385	+	}
386	+	assertTrue(copy.containsAll(iterated));
387	+	assertTrue(copy.containsAll(spliterated));
388	+	}
389	+
390	+	/**
391	+	* Some elements randomly disappear in the middle of traversal.
392	+	*/
393	+	public void testRandomElementRemovalDuringTraversal() {
394	+	Collection c = impl.emptyCollection();
395	+	ThreadLocalRandom rnd = ThreadLocalRandom.current();
396	+	int n = rnd.nextInt(6);
397	+	ArrayList copy = new ArrayList();
398	+	for (int i = 0; i < n; i++) {
399	+	Object x = impl.makeElement(i);
400	+	copy.add(x);
401	+	c.add(x);
402	+	}
403	+	ArrayList iterated = new ArrayList();
404	+	ArrayList spliterated = new ArrayList();
405	+	ArrayList removed = new ArrayList();
406	+	Spliterator s = c.spliterator();
407	+	Iterator it = c.iterator();
408	+	if (! (s.hasCharacteristics(Spliterator.CONCURRENT) ||
409	+	s.hasCharacteristics(Spliterator.IMMUTABLE)))
410	+	return;
411	+	for (int i = rnd.nextInt(n + 1); --i >= 0; ) {
412	+	assertTrue(s.tryAdvance(e -> {}));
413	+	if (rnd.nextBoolean()) assertTrue(it.hasNext());
414	+	it.next();
415	+	}
416	+	Consumer alwaysThrows = e -> { throw new AssertionError(); };
417	+	// TODO: many more removal methods
418	+	if (rnd.nextBoolean()) {
419	+	for (Iterator z = c.iterator(); z.hasNext(); ) {
420	+	Object e = z.next();
421	+	if (rnd.nextBoolean()) {
422	+	try {
423	+	z.remove();
424	+	} catch (UnsupportedOperationException ok) { return; }
425	+	removed.add(e);
426	+	}
427	+	}
428	+	} else {
429	+	Predicate randomlyRemove = e -> {
430	+	if (rnd.nextBoolean()) { removed.add(e); return true; }
431	+	else return false;
432	+	};
433	+	c.removeIf(randomlyRemove);
434	+	}
435	+	s.forEachRemaining(spliterated::add);
436	+	while (it.hasNext())
437	+	iterated.add(it.next());
438	+	assertTrue(copy.containsAll(iterated));
439	+	assertTrue(copy.containsAll(spliterated));
440	+	assertTrue(copy.containsAll(removed));
441	+	if (s.hasCharacteristics(Spliterator.CONCURRENT)) {
442	+	ArrayList iteratedAndRemoved = new ArrayList(iterated);
443	+	ArrayList spliteratedAndRemoved = new ArrayList(spliterated);
444	+	iteratedAndRemoved.retainAll(removed);
445	+	spliteratedAndRemoved.retainAll(removed);
446	+	assertTrue(iteratedAndRemoved.size() <= 1);
447	+	assertTrue(spliteratedAndRemoved.size() <= 1);
448	+	if (testImplementationDetails
449	+	&& !(c instanceof java.util.concurrent.ArrayBlockingQueue))
450	+	assertTrue(spliteratedAndRemoved.isEmpty());
451	+	}
452	+	}
453	+
454	+	/**
455		* Various ways of traversing a collection yield same elements
456		*/
457	<	public void testIteratorEquivalence() {
457	>	public void testTraversalEquivalence() {
458		Collection c = impl.emptyCollection();
459		ThreadLocalRandom rnd = ThreadLocalRandom.current();
460		int n = rnd.nextInt(6);
#	Line 339 | Line 463 | public class Collection8Test extends JSR
463		ArrayList iteratedForEachRemaining = new ArrayList();
464		ArrayList tryAdvanced = new ArrayList();
465		ArrayList spliterated = new ArrayList();
466	+	ArrayList splitonced = new ArrayList();
467		ArrayList forEached = new ArrayList();
468	+	ArrayList streamForEached = new ArrayList();
469	+	ConcurrentLinkedQueue parallelStreamForEached = new ConcurrentLinkedQueue();
470		ArrayList removeIfed = new ArrayList();
471		for (Object x : c) iterated.add(x);
472	<	c.iterator().forEachRemaining(e -> iteratedForEachRemaining.add(e));
472	>	c.iterator().forEachRemaining(iteratedForEachRemaining::add);
473		for (Spliterator s = c.spliterator();
474	<	s.tryAdvance(e -> tryAdvanced.add(e)); ) {}
475	<	c.spliterator().forEachRemaining(e -> spliterated.add(e));
476	<	c.forEach(e -> forEached.add(e));
474	>	s.tryAdvance(tryAdvanced::add); ) {}
475	>	c.spliterator().forEachRemaining(spliterated::add);
476	>	{                       // trySplit returns "strict prefix"
477	>	Spliterator s1 = c.spliterator(), s2 = s1.trySplit();
478	>	if (s2 != null) s2.forEachRemaining(splitonced::add);
479	>	s1.forEachRemaining(splitonced::add);
480	>	}
481	>	c.forEach(forEached::add);
482	>	c.stream().forEach(streamForEached::add);
483	>	c.parallelStream().forEach(parallelStreamForEached::add);
484		c.removeIf(e -> { removeIfed.add(e); return false; });
485		boolean ordered =
486		c.spliterator().hasCharacteristics(Spliterator.ORDERED);
487		if (c instanceof List || c instanceof Deque)
488		assertTrue(ordered);
489	+	HashSet cset = new HashSet(c);
490	+	assertEquals(cset, new HashSet(parallelStreamForEached));
491		if (ordered) {
492		assertEquals(iterated, iteratedForEachRemaining);
493		assertEquals(iterated, tryAdvanced);
494		assertEquals(iterated, spliterated);
495	+	assertEquals(iterated, splitonced);
496		assertEquals(iterated, forEached);
497	+	assertEquals(iterated, streamForEached);
498		assertEquals(iterated, removeIfed);
499		} else {
362	–	HashSet cset = new HashSet(c);
500		assertEquals(cset, new HashSet(iterated));
501		assertEquals(cset, new HashSet(iteratedForEachRemaining));
502		assertEquals(cset, new HashSet(tryAdvanced));
503		assertEquals(cset, new HashSet(spliterated));
504	+	assertEquals(cset, new HashSet(splitonced));
505		assertEquals(cset, new HashSet(forEached));
506	+	assertEquals(cset, new HashSet(streamForEached));
507		assertEquals(cset, new HashSet(removeIfed));
508		}
509		if (c instanceof Deque) {
#	Line 383 | Line 522 | public class Collection8Test extends JSR
522		}
523
524		/**
525	+	* Iterator.forEachRemaining has same behavior as Iterator's
526	+	* default implementation.
527	+	*/
528	+	public void testForEachRemainingConsistentWithDefaultImplementation() {
529	+	Collection c = impl.emptyCollection();
530	+	if (!testImplementationDetails
531	+	|| c.getClass() == java.util.LinkedList.class)
532	+	return;
533	+	ThreadLocalRandom rnd = ThreadLocalRandom.current();
534	+	int n = 1 + rnd.nextInt(3);
535	+	for (int i = 0; i < n; i++) c.add(impl.makeElement(i));
536	+	ArrayList iterated = new ArrayList();
537	+	ArrayList iteratedForEachRemaining = new ArrayList();
538	+	Iterator it1 = c.iterator();
539	+	Iterator it2 = c.iterator();
540	+	assertTrue(it1.hasNext());
541	+	assertTrue(it2.hasNext());
542	+	c.clear();
543	+	Object r1, r2;
544	+	try {
545	+	while (it1.hasNext()) iterated.add(it1.next());
546	+	r1 = iterated;
547	+	} catch (ConcurrentModificationException ex) {
548	+	r1 = ConcurrentModificationException.class;
549	+	assertFalse(impl.isConcurrent());
550	+	}
551	+	try {
552	+	it2.forEachRemaining(iteratedForEachRemaining::add);
553	+	r2 = iteratedForEachRemaining;
554	+	} catch (ConcurrentModificationException ex) {
555	+	r2 = ConcurrentModificationException.class;
556	+	assertFalse(impl.isConcurrent());
557	+	}
558	+	assertEquals(r1, r2);
559	+	}
560	+
561	+	/**
562		* Calling Iterator#remove() after Iterator#forEachRemaining
563		* should (maybe) remove last element
564		*/
565		public void testRemoveAfterForEachRemaining() {
566		Collection c = impl.emptyCollection();
567		ThreadLocalRandom rnd = ThreadLocalRandom.current();
568	<	{
568	>	ArrayList copy = new ArrayList();
569	>	boolean ordered = c.spliterator().hasCharacteristics(Spliterator.ORDERED);
570	>	testCollection: {
571		int n = 3 + rnd.nextInt(2);
572	<	for (int i = 0; i < n; i++) c.add(impl.makeElement(i));
572	>	for (int i = 0; i < n; i++) {
573	>	Object x = impl.makeElement(i);
574	>	c.add(x);
575	>	copy.add(x);
576	>	}
577		Iterator it = c.iterator();
578	<	assertTrue(it.hasNext());
579	<	assertEquals(impl.makeElement(0), it.next());
580	<	assertTrue(it.hasNext());
581	<	assertEquals(impl.makeElement(1), it.next());
582	<	it.forEachRemaining(e -> assertTrue(c.contains(e)));
578	>	if (ordered) {
579	>	if (rnd.nextBoolean()) assertTrue(it.hasNext());
580	>	assertEquals(impl.makeElement(0), it.next());
581	>	if (rnd.nextBoolean()) assertTrue(it.hasNext());
582	>	assertEquals(impl.makeElement(1), it.next());
583	>	} else {
584	>	if (rnd.nextBoolean()) assertTrue(it.hasNext());
585	>	assertTrue(copy.contains(it.next()));
586	>	if (rnd.nextBoolean()) assertTrue(it.hasNext());
587	>	assertTrue(copy.contains(it.next()));
588	>	}
589	>	if (rnd.nextBoolean()) assertTrue(it.hasNext());
590	>	it.forEachRemaining(
591	>	e -> {
592	>	assertTrue(c.contains(e));
593	>	assertTrue(copy.contains(e));});
594		if (testImplementationDetails) {
595		if (c instanceof java.util.concurrent.ArrayBlockingQueue) {
596		assertIteratorExhausted(it);
597		} else {
598	<	it.remove();
598	>	try { it.remove(); }
599	>	catch (UnsupportedOperationException ok) {
600	>	break testCollection;
601	>	}
602		assertEquals(n - 1, c.size());
603	<	for (int i = 0; i < n - 1; i++)
604	<	assertTrue(c.contains(impl.makeElement(i)));
605	<	assertFalse(c.contains(impl.makeElement(n - 1)));
603	>	if (ordered) {
604	>	for (int i = 0; i < n - 1; i++)
605	>	assertTrue(c.contains(impl.makeElement(i)));
606	>	assertFalse(c.contains(impl.makeElement(n - 1)));
607	>	}
608		}
609		}
610		}
611		if (c instanceof Deque) {
612		Deque d = (Deque) impl.emptyCollection();
613	+	assertTrue(ordered);
614		int n = 3 + rnd.nextInt(2);
615		for (int i = 0; i < n; i++) d.add(impl.makeElement(i));
616		Iterator it = d.descendingIterator();
#	Line 518 | Line 717 | public class Collection8Test extends JSR
717		assertTrue(found.isEmpty());
718		}
719
720	<	public void testForEachConcurrentStressTest() throws Throwable {
720	>	/** TODO: promote to a common utility */
721	>	static <T> T chooseOne(T ... ts) {
722	>	return ts[ThreadLocalRandom.current().nextInt(ts.length)];
723	>	}
724	>
725	>	/** TODO: more random adders and removers */
726	>	static <E> Runnable adderRemover(Collection<E> c, E e) {
727	>	return chooseOne(
728	>	() -> {
729	>	assertTrue(c.add(e));
730	>	assertTrue(c.contains(e));
731	>	assertTrue(c.remove(e));
732	>	assertFalse(c.contains(e));
733	>	},
734	>	() -> {
735	>	assertTrue(c.add(e));
736	>	assertTrue(c.contains(e));
737	>	assertTrue(c.removeIf(x -> x == e));
738	>	assertFalse(c.contains(e));
739	>	},
740	>	() -> {
741	>	assertTrue(c.add(e));
742	>	assertTrue(c.contains(e));
743	>	for (Iterator it = c.iterator();; )
744	>	if (it.next() == e) {
745	>	try { it.remove(); }
746	>	catch (UnsupportedOperationException ok) {
747	>	c.remove(e);
748	>	}
749	>	break;
750	>	}
751	>	assertFalse(c.contains(e));
752	>	});
753	>	}
754	>
755	>	/**
756	>	* Concurrent Spliterators, once exhausted, stay exhausted.
757	>	*/
758	>	public void testStickySpliteratorExhaustion() throws Throwable {
759		if (!impl.isConcurrent()) return;
760	+	if (!testImplementationDetails) return;
761	+	final ThreadLocalRandom rnd = ThreadLocalRandom.current();
762	+	final Consumer alwaysThrows = e -> { throw new AssertionError(); };
763		final Collection c = impl.emptyCollection();
764	<	final long testDurationMillis = timeoutMillis();
764	>	final Spliterator s = c.spliterator();
765	>	if (rnd.nextBoolean()) {
766	>	assertFalse(s.tryAdvance(alwaysThrows));
767	>	} else {
768	>	s.forEachRemaining(alwaysThrows);
769	>	}
770	>	final Object one = impl.makeElement(1);
771	>	// Spliterator should not notice added element
772	>	c.add(one);
773	>	if (rnd.nextBoolean()) {
774	>	assertFalse(s.tryAdvance(alwaysThrows));
775	>	} else {
776	>	s.forEachRemaining(alwaysThrows);
777	>	}
778	>	}
779	>
780	>	/**
781	>	* Motley crew of threads concurrently randomly hammer the collection.
782	>	*/
783	>	public void testDetectRaces() throws Throwable {
784	>	if (!impl.isConcurrent()) return;
785	>	final ThreadLocalRandom rnd = ThreadLocalRandom.current();
786	>	final Collection c = impl.emptyCollection();
787	>	final long testDurationMillis
788	>	= expensiveTests ? LONG_DELAY_MS : timeoutMillis();
789		final AtomicBoolean done = new AtomicBoolean(false);
790	<	final Object elt = impl.makeElement(1);
791	<	final Future<?> f1, f2;
790	>	final Object one = impl.makeElement(1);
791	>	final Object two = impl.makeElement(2);
792	>	final Consumer checkSanity = x -> assertTrue(x == one || x == two);
793	>	final Consumer<Object[]> checkArraySanity = array -> {
794	>	// assertTrue(array.length <= 2); // duplicates are permitted
795	>	for (Object x : array) assertTrue(x == one || x == two);
796	>	};
797	>	final Object[] emptyArray =
798	>	(Object[]) java.lang.reflect.Array.newInstance(one.getClass(), 0);
799	>	final List<Future<?>> futures;
800	>	final Phaser threadsStarted = new Phaser(1); // register this thread
801	>	final Runnable[] frobbers = {
802	>	() -> c.forEach(checkSanity),
803	>	() -> c.stream().forEach(checkSanity),
804	>	() -> c.parallelStream().forEach(checkSanity),
805	>	() -> c.spliterator().trySplit(),
806	>	() -> {
807	>	Spliterator s = c.spliterator();
808	>	s.tryAdvance(checkSanity);
809	>	s.trySplit();
810	>	},
811	>	() -> {
812	>	Spliterator s = c.spliterator();
813	>	do {} while (s.tryAdvance(checkSanity));
814	>	},
815	>	() -> { for (Object x : c) checkSanity.accept(x); },
816	>	() -> checkArraySanity.accept(c.toArray()),
817	>	() -> checkArraySanity.accept(c.toArray(emptyArray)),
818	>	() -> {
819	>	Object[] a = new Object[5];
820	>	Object three = impl.makeElement(3);
821	>	Arrays.fill(a, 0, a.length, three);
822	>	Object[] x = c.toArray(a);
823	>	if (x == a)
824	>	for (int i = 0; i < a.length && a[i] != null; i++)
825	>	checkSanity.accept(a[i]);
826	>	// A careful reading of the spec does not support:
827	>	// for (i++; i < a.length; i++) assertSame(three, a[i]);
828	>	else
829	>	checkArraySanity.accept(x);
830	>	},
831	>	adderRemover(c, one),
832	>	adderRemover(c, two),
833	>	};
834	>	final List<Runnable> tasks =
835	>	Arrays.stream(frobbers)
836	>	.filter(task -> rnd.nextBoolean()) // random subset
837	>	.map(task -> (Runnable) () -> {
838	>	threadsStarted.arriveAndAwaitAdvance();
839	>	while (!done.get())
840	>	task.run();
841	>	})
842	>	.collect(Collectors.toList());
843		final ExecutorService pool = Executors.newCachedThreadPool();
844		try (PoolCleaner cleaner = cleaner(pool, done)) {
845	<	final CountDownLatch threadsStarted = new CountDownLatch(2);
846	<	Runnable checkElt = () -> {
847	<	threadsStarted.countDown();
848	<	while (!done.get())
849	<	c.forEach(x -> assertSame(x, elt)); };
535	<	Runnable addRemove = () -> {
536	<	threadsStarted.countDown();
537	<	while (!done.get()) {
538	<	assertTrue(c.add(elt));
539	<	assertTrue(c.remove(elt));
540	<	}};
541	<	f1 = pool.submit(checkElt);
542	<	f2 = pool.submit(addRemove);
845	>	threadsStarted.bulkRegister(tasks.size());
846	>	futures = tasks.stream()
847	>	.map(pool::submit)
848	>	.collect(Collectors.toList());
849	>	threadsStarted.arriveAndDeregister();
850		Thread.sleep(testDurationMillis);
851		}
852	<	assertNull(f1.get(0L, MILLISECONDS));
853	<	assertNull(f2.get(0L, MILLISECONDS));
852	>	for (Future future : futures)
853	>	assertNull(future.get(0L, MILLISECONDS));
854	>	}
855	>
856	>	/**
857	>	* Spliterators are either IMMUTABLE or truly late-binding or, if
858	>	* concurrent, use the same "late-binding style" of returning
859	>	* elements added between creation and first use.
860	>	*/
861	>	public void testLateBindingStyle() {
862	>	if (!testImplementationDetails) return;
863	>	if (impl.klazz() == ArrayList.class) return; // for jdk8
864	>	// Immutable (snapshot) spliterators are exempt
865	>	if (impl.emptyCollection().spliterator()
866	>	.hasCharacteristics(Spliterator.IMMUTABLE))
867	>	return;
868	>	final Object one = impl.makeElement(1);
869	>	{
870	>	final Collection c = impl.emptyCollection();
871	>	final Spliterator split = c.spliterator();
872	>	c.add(one);
873	>	assertTrue(split.tryAdvance(e -> { assertSame(e, one); }));
874	>	assertFalse(split.tryAdvance(e -> { throw new AssertionError(); }));
875	>	assertTrue(c.contains(one));
876	>	}
877	>	{
878	>	final AtomicLong count = new AtomicLong(0);
879	>	final Collection c = impl.emptyCollection();
880	>	final Spliterator split = c.spliterator();
881	>	c.add(one);
882	>	split.forEachRemaining(
883	>	e -> { assertSame(e, one); count.getAndIncrement(); });
884	>	assertEquals(1L, count.get());
885	>	assertFalse(split.tryAdvance(e -> { throw new AssertionError(); }));
886	>	assertTrue(c.contains(one));
887	>	}
888	>	}
889	>
890	>	/**
891	>	* Spliterator.getComparator throws IllegalStateException iff the
892	>	* spliterator does not report SORTED.
893	>	*/
894	>	public void testGetComparator_IllegalStateException() {
895	>	Collection c = impl.emptyCollection();
896	>	Spliterator s = c.spliterator();
897	>	boolean reportsSorted = s.hasCharacteristics(Spliterator.SORTED);
898	>	try {
899	>	s.getComparator();
900	>	assertTrue(reportsSorted);
901	>	} catch (IllegalStateException ex) {
902	>	assertFalse(reportsSorted);
903	>	}
904	>	}
905	>
906	>	public void testCollectionCopies() throws Exception {
907	>	ThreadLocalRandom rnd = ThreadLocalRandom.current();
908	>	Collection c = impl.emptyCollection();
909	>	for (int n = rnd.nextInt(4); n--> 0; )
910	>	c.add(impl.makeElement(rnd.nextInt()));
911	>	assertEquals(c, c);
912	>	if (c instanceof List)
913	>	assertCollectionsEquals(c, new ArrayList(c));
914	>	else if (c instanceof Set)
915	>	assertCollectionsEquals(c, new HashSet(c));
916	>	else if (c instanceof Deque)
917	>	assertCollectionsEquivalent(c, new ArrayDeque(c));
918	>
919	>	Collection clone = cloneableClone(c);
920	>	if (clone != null) {
921	>	assertSame(c.getClass(), clone.getClass());
922	>	assertCollectionsEquivalent(c, clone);
923	>	}
924	>	try {
925	>	Collection serialClone = serialClonePossiblyFailing(c);
926	>	assertSame(c.getClass(), serialClone.getClass());
927	>	assertCollectionsEquivalent(c, serialClone);
928	>	} catch (java.io.NotSerializableException acceptable) {}
929	>	}
930	>
931	>	/**
932	>	* TODO: move out of limbo
933	>	* 8203662: remove increment of modCount from ArrayList and Vector replaceAll()
934	>	*/
935	>	public void DISABLED_testReplaceAllIsNotStructuralModification() {
936	>	Collection c = impl.emptyCollection();
937	>	if (!(c instanceof List))
938	>	return;
939	>	List list = (List) c;
940	>	ThreadLocalRandom rnd = ThreadLocalRandom.current();
941	>	for (int n = rnd.nextInt(2, 10); n--> 0; )
942	>	list.add(impl.makeElement(rnd.nextInt()));
943	>	ArrayList copy = new ArrayList(list);
944	>	int size = list.size(), half = size / 2;
945	>	Iterator it = list.iterator();
946	>	for (int i = 0; i < half; i++)
947	>	assertEquals(it.next(), copy.get(i));
948	>	list.replaceAll(n -> n);
949	>	// ConcurrentModificationException must not be thrown here.
950	>	for (int i = half; i < size; i++)
951	>	assertEquals(it.next(), copy.get(i));
952		}
953
954		//     public void testCollection8DebugFail() {

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