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

Comparing jsr166/src/test/tck/Collection8Test.java (file contents):
Revision 1.28 by jsr166, Fri Nov 18 17:23:29 2016 UTC vs.
Revision 1.60 by jsr166, Mon Dec 16 21:22:33 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;
#	Line 57 | 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. */
#	Line 90 | 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 138 | 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 160 | 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 188 | 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); }
193	<	catch (InterruptedException ex) {
194	<	throw new AssertionError(ex);
195	<	}},
196	<	() -> {
197	<	try { q.put(null); }
198	<	catch (InterruptedException ex) {
199	<	throw new AssertionError(ex);
200	<	}});
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);
210	<	}},
211	<	() -> {
212	<	try { q.offerLast(null, 1L, HOURS); }
213	<	catch (InterruptedException ex) {
214	<	throw new AssertionError(ex);
215	<	}},
216	<	() -> {
217	<	try { q.putFirst(null); }
218	<	catch (InterruptedException ex) {
219	<	throw new AssertionError(ex);
220	<	}},
221	<	() -> {
222	<	try { q.putLast(null); }
223	<	catch (InterruptedException ex) {
224	<	throw new AssertionError(ex);
225	<	}});
220	>	() -> q.offerFirst(null, 1L, HOURS),
221	>	() -> q.offerLast(null, 1L, HOURS),
222	>	() -> q.putFirst(null),
223	>	() -> q.putLast(null));
224		}
225		}
226
#	Line 250 | 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 341 | 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	+	// TODO: many more removal methods
417	+	if (rnd.nextBoolean()) {
418	+	for (Iterator z = c.iterator(); z.hasNext(); ) {
419	+	Object e = z.next();
420	+	if (rnd.nextBoolean()) {
421	+	try {
422	+	z.remove();
423	+	} catch (UnsupportedOperationException ok) { return; }
424	+	removed.add(e);
425	+	}
426	+	}
427	+	} else {
428	+	Predicate randomlyRemove = e -> {
429	+	if (rnd.nextBoolean()) { removed.add(e); return true; }
430	+	else return false;
431	+	};
432	+	c.removeIf(randomlyRemove);
433	+	}
434	+	s.forEachRemaining(spliterated::add);
435	+	while (it.hasNext())
436	+	iterated.add(it.next());
437	+	assertTrue(copy.containsAll(iterated));
438	+	assertTrue(copy.containsAll(spliterated));
439	+	assertTrue(copy.containsAll(removed));
440	+	if (s.hasCharacteristics(Spliterator.CONCURRENT)) {
441	+	ArrayList iteratedAndRemoved = new ArrayList(iterated);
442	+	ArrayList spliteratedAndRemoved = new ArrayList(spliterated);
443	+	iteratedAndRemoved.retainAll(removed);
444	+	spliteratedAndRemoved.retainAll(removed);
445	+	assertTrue(iteratedAndRemoved.size() <= 1);
446	+	assertTrue(spliteratedAndRemoved.size() <= 1);
447	+	if (testImplementationDetails
448	+	&& !(c instanceof java.util.concurrent.ArrayBlockingQueue))
449	+	assertTrue(spliteratedAndRemoved.isEmpty());
450	+	}
451	+	}
452	+
453	+	/**
454		* Various ways of traversing a collection yield same elements
455		*/
456	<	public void testIteratorEquivalence() {
456	>	public void testTraversalEquivalence() {
457		Collection c = impl.emptyCollection();
458		ThreadLocalRandom rnd = ThreadLocalRandom.current();
459		int n = rnd.nextInt(6);
#	Line 352 | Line 462 | public class Collection8Test extends JSR
462		ArrayList iteratedForEachRemaining = new ArrayList();
463		ArrayList tryAdvanced = new ArrayList();
464		ArrayList spliterated = new ArrayList();
465	+	ArrayList splitonced = new ArrayList();
466		ArrayList forEached = new ArrayList();
467	+	ArrayList streamForEached = new ArrayList();
468	+	ConcurrentLinkedQueue parallelStreamForEached = new ConcurrentLinkedQueue();
469		ArrayList removeIfed = new ArrayList();
470		for (Object x : c) iterated.add(x);
471		c.iterator().forEachRemaining(iteratedForEachRemaining::add);
472		for (Spliterator s = c.spliterator();
473		s.tryAdvance(tryAdvanced::add); ) {}
474		c.spliterator().forEachRemaining(spliterated::add);
475	+	{                       // trySplit returns "strict prefix"
476	+	Spliterator s1 = c.spliterator(), s2 = s1.trySplit();
477	+	if (s2 != null) s2.forEachRemaining(splitonced::add);
478	+	s1.forEachRemaining(splitonced::add);
479	+	}
480		c.forEach(forEached::add);
481	+	c.stream().forEach(streamForEached::add);
482	+	c.parallelStream().forEach(parallelStreamForEached::add);
483		c.removeIf(e -> { removeIfed.add(e); return false; });
484		boolean ordered =
485		c.spliterator().hasCharacteristics(Spliterator.ORDERED);
486		if (c instanceof List || c instanceof Deque)
487		assertTrue(ordered);
488	+	HashSet cset = new HashSet(c);
489	+	assertEquals(cset, new HashSet(parallelStreamForEached));
490		if (ordered) {
491		assertEquals(iterated, iteratedForEachRemaining);
492		assertEquals(iterated, tryAdvanced);
493		assertEquals(iterated, spliterated);
494	+	assertEquals(iterated, splitonced);
495		assertEquals(iterated, forEached);
496	+	assertEquals(iterated, streamForEached);
497		assertEquals(iterated, removeIfed);
498		} else {
375	–	HashSet cset = new HashSet(c);
499		assertEquals(cset, new HashSet(iterated));
500		assertEquals(cset, new HashSet(iteratedForEachRemaining));
501		assertEquals(cset, new HashSet(tryAdvanced));
502		assertEquals(cset, new HashSet(spliterated));
503	+	assertEquals(cset, new HashSet(splitonced));
504		assertEquals(cset, new HashSet(forEached));
505	+	assertEquals(cset, new HashSet(streamForEached));
506		assertEquals(cset, new HashSet(removeIfed));
507		}
508		if (c instanceof Deque) {
#	Line 396 | Line 521 | public class Collection8Test extends JSR
521		}
522
523		/**
524	+	* Iterator.forEachRemaining has same behavior as Iterator's
525	+	* default implementation.
526	+	*/
527	+	public void testForEachRemainingConsistentWithDefaultImplementation() {
528	+	Collection c = impl.emptyCollection();
529	+	if (!testImplementationDetails
530	+	|| c.getClass() == java.util.LinkedList.class)
531	+	return;
532	+	ThreadLocalRandom rnd = ThreadLocalRandom.current();
533	+	int n = 1 + rnd.nextInt(3);
534	+	for (int i = 0; i < n; i++) c.add(impl.makeElement(i));
535	+	ArrayList iterated = new ArrayList();
536	+	ArrayList iteratedForEachRemaining = new ArrayList();
537	+	Iterator it1 = c.iterator();
538	+	Iterator it2 = c.iterator();
539	+	assertTrue(it1.hasNext());
540	+	assertTrue(it2.hasNext());
541	+	c.clear();
542	+	Object r1, r2;
543	+	try {
544	+	while (it1.hasNext()) iterated.add(it1.next());
545	+	r1 = iterated;
546	+	} catch (ConcurrentModificationException ex) {
547	+	r1 = ConcurrentModificationException.class;
548	+	assertFalse(impl.isConcurrent());
549	+	}
550	+	try {
551	+	it2.forEachRemaining(iteratedForEachRemaining::add);
552	+	r2 = iteratedForEachRemaining;
553	+	} catch (ConcurrentModificationException ex) {
554	+	r2 = ConcurrentModificationException.class;
555	+	assertFalse(impl.isConcurrent());
556	+	}
557	+	assertEquals(r1, r2);
558	+	}
559	+
560	+	/**
561		* Calling Iterator#remove() after Iterator#forEachRemaining
562		* should (maybe) remove last element
563		*/
564		public void testRemoveAfterForEachRemaining() {
565		Collection c = impl.emptyCollection();
566		ThreadLocalRandom rnd = ThreadLocalRandom.current();
567	+	ArrayList copy = new ArrayList();
568	+	boolean ordered = c.spliterator().hasCharacteristics(Spliterator.ORDERED);
569		testCollection: {
570		int n = 3 + rnd.nextInt(2);
571	<	for (int i = 0; i < n; i++) c.add(impl.makeElement(i));
571	>	for (int i = 0; i < n; i++) {
572	>	Object x = impl.makeElement(i);
573	>	c.add(x);
574	>	copy.add(x);
575	>	}
576		Iterator it = c.iterator();
577	<	assertTrue(it.hasNext());
578	<	assertEquals(impl.makeElement(0), it.next());
579	<	assertTrue(it.hasNext());
580	<	assertEquals(impl.makeElement(1), it.next());
581	<	it.forEachRemaining(e -> assertTrue(c.contains(e)));
577	>	if (ordered) {
578	>	if (rnd.nextBoolean()) assertTrue(it.hasNext());
579	>	assertEquals(impl.makeElement(0), it.next());
580	>	if (rnd.nextBoolean()) assertTrue(it.hasNext());
581	>	assertEquals(impl.makeElement(1), it.next());
582	>	} else {
583	>	if (rnd.nextBoolean()) assertTrue(it.hasNext());
584	>	assertTrue(copy.contains(it.next()));
585	>	if (rnd.nextBoolean()) assertTrue(it.hasNext());
586	>	assertTrue(copy.contains(it.next()));
587	>	}
588	>	if (rnd.nextBoolean()) assertTrue(it.hasNext());
589	>	it.forEachRemaining(
590	>	e -> {
591	>	assertTrue(c.contains(e));
592	>	assertTrue(copy.contains(e));});
593		if (testImplementationDetails) {
594		if (c instanceof java.util.concurrent.ArrayBlockingQueue) {
595		assertIteratorExhausted(it);
#	Line 420 | Line 599 | public class Collection8Test extends JSR
599		break testCollection;
600		}
601		assertEquals(n - 1, c.size());
602	<	for (int i = 0; i < n - 1; i++)
603	<	assertTrue(c.contains(impl.makeElement(i)));
604	<	assertFalse(c.contains(impl.makeElement(n - 1)));
602	>	if (ordered) {
603	>	for (int i = 0; i < n - 1; i++)
604	>	assertTrue(c.contains(impl.makeElement(i)));
605	>	assertFalse(c.contains(impl.makeElement(n - 1)));
606	>	}
607		}
608		}
609		}
610		if (c instanceof Deque) {
611		Deque d = (Deque) impl.emptyCollection();
612	+	assertTrue(ordered);
613		int n = 3 + rnd.nextInt(2);
614		for (int i = 0; i < n; i++) d.add(impl.makeElement(i));
615		Iterator it = d.descendingIterator();
#	Line 451 | Line 633 | public class Collection8Test extends JSR
633		*/
634		public void testStreamForEach() throws Throwable {
635		final Collection c = impl.emptyCollection();
454	–	final AtomicLong count = new AtomicLong(0L);
636		final Object x = impl.makeElement(1);
637		final Object y = impl.makeElement(2);
638		final ArrayList found = new ArrayList();
#	Line 509 | Line 690 | public class Collection8Test extends JSR
690		*/
691		public void testForEach() throws Throwable {
692		final Collection c = impl.emptyCollection();
512	–	final AtomicLong count = new AtomicLong(0L);
693		final Object x = impl.makeElement(1);
694		final Object y = impl.makeElement(2);
695		final ArrayList found = new ArrayList();
#	Line 534 | Line 714 | public class Collection8Test extends JSR
714		assertTrue(found.isEmpty());
715		}
716
717	+	/** TODO: promote to a common utility */
718	+	static <T> T chooseOne(T ... ts) {
719	+	return ts[ThreadLocalRandom.current().nextInt(ts.length)];
720	+	}
721	+
722	+	/** TODO: more random adders and removers */
723	+	static <E> Runnable adderRemover(Collection<E> c, E e) {
724	+	return chooseOne(
725	+	() -> {
726	+	assertTrue(c.add(e));
727	+	assertTrue(c.contains(e));
728	+	assertTrue(c.remove(e));
729	+	assertFalse(c.contains(e));
730	+	},
731	+	() -> {
732	+	assertTrue(c.add(e));
733	+	assertTrue(c.contains(e));
734	+	assertTrue(c.removeIf(x -> x == e));
735	+	assertFalse(c.contains(e));
736	+	},
737	+	() -> {
738	+	assertTrue(c.add(e));
739	+	assertTrue(c.contains(e));
740	+	for (Iterator it = c.iterator();; )
741	+	if (it.next() == e) {
742	+	try { it.remove(); }
743	+	catch (UnsupportedOperationException ok) {
744	+	c.remove(e);
745	+	}
746	+	break;
747	+	}
748	+	assertFalse(c.contains(e));
749	+	});
750	+	}
751	+
752	+	/**
753	+	* Concurrent Spliterators, once exhausted, stay exhausted.
754	+	*/
755	+	public void testStickySpliteratorExhaustion() throws Throwable {
756	+	if (!impl.isConcurrent()) return;
757	+	if (!testImplementationDetails) return;
758	+	final ThreadLocalRandom rnd = ThreadLocalRandom.current();
759	+	final Consumer alwaysThrows = e -> { throw new AssertionError(); };
760	+	final Collection c = impl.emptyCollection();
761	+	final Spliterator s = c.spliterator();
762	+	if (rnd.nextBoolean()) {
763	+	assertFalse(s.tryAdvance(alwaysThrows));
764	+	} else {
765	+	s.forEachRemaining(alwaysThrows);
766	+	}
767	+	final Object one = impl.makeElement(1);
768	+	// Spliterator should not notice added element
769	+	c.add(one);
770	+	if (rnd.nextBoolean()) {
771	+	assertFalse(s.tryAdvance(alwaysThrows));
772	+	} else {
773	+	s.forEachRemaining(alwaysThrows);
774	+	}
775	+	}
776	+
777		/**
778		* Motley crew of threads concurrently randomly hammer the collection.
779		*/
#	Line 541 | Line 781 | public class Collection8Test extends JSR
781		if (!impl.isConcurrent()) return;
782		final ThreadLocalRandom rnd = ThreadLocalRandom.current();
783		final Collection c = impl.emptyCollection();
784	<	final long testDurationMillis = timeoutMillis();
784	>	final long testDurationMillis
785	>	= expensiveTests ? LONG_DELAY_MS : timeoutMillis();
786		final AtomicBoolean done = new AtomicBoolean(false);
787		final Object one = impl.makeElement(1);
788		final Object two = impl.makeElement(2);
789	+	final Consumer checkSanity = x -> assertTrue(x == one || x == two);
790	+	final Consumer<Object[]> checkArraySanity = array -> {
791	+	// assertTrue(array.length <= 2); // duplicates are permitted
792	+	for (Object x : array) assertTrue(x == one || x == two);
793	+	};
794	+	final Object[] emptyArray =
795	+	(Object[]) java.lang.reflect.Array.newInstance(one.getClass(), 0);
796		final List<Future<?>> futures;
797		final Phaser threadsStarted = new Phaser(1); // register this thread
798		final Runnable[] frobbers = {
799	<	() -> c.forEach(x -> assertTrue(x == one || x == two)),
800	<	() -> c.stream().forEach(x -> assertTrue(x == one || x == two)),
799	>	() -> c.forEach(checkSanity),
800	>	() -> c.stream().forEach(checkSanity),
801	>	() -> c.parallelStream().forEach(checkSanity),
802		() -> c.spliterator().trySplit(),
803		() -> {
804		Spliterator s = c.spliterator();
805	<	s.tryAdvance(x -> assertTrue(x == one || x == two));
805	>	s.tryAdvance(checkSanity);
806		s.trySplit();
807		},
808		() -> {
809		Spliterator s = c.spliterator();
810	<	do {} while (s.tryAdvance(x -> assertTrue(x == one || x == two)));
562	<	},
563	<	() -> {
564	<	for (Object x : c) assertTrue(x == one || x == two);
810	>	do {} while (s.tryAdvance(checkSanity));
811		},
812	+	() -> { for (Object x : c) checkSanity.accept(x); },
813	+	() -> checkArraySanity.accept(c.toArray()),
814	+	() -> checkArraySanity.accept(c.toArray(emptyArray)),
815		() -> {
816	<	assertTrue(c.add(one));
817	<	assertTrue(c.contains(one));
818	<	assertTrue(c.remove(one));
819	<	assertFalse(c.contains(one));
820	<	},
821	<	() -> {
822	<	assertTrue(c.add(two));
823	<	assertTrue(c.contains(two));
824	<	assertTrue(c.remove(two));
825	<	assertFalse(c.contains(two));
826	<	},
816	>	Object[] a = new Object[5];
817	>	Object three = impl.makeElement(3);
818	>	Arrays.fill(a, 0, a.length, three);
819	>	Object[] x = c.toArray(a);
820	>	if (x == a)
821	>	for (int i = 0; i < a.length && a[i] != null; i++)
822	>	checkSanity.accept(a[i]);
823	>	// A careful reading of the spec does not support:
824	>	// for (i++; i < a.length; i++) assertSame(three, a[i]);
825	>	else
826	>	checkArraySanity.accept(x);
827	>	},
828	>	adderRemover(c, one),
829	>	adderRemover(c, two),
830		};
831		final List<Runnable> tasks =
832		Arrays.stream(frobbers)
#	Line 598 | Line 850 | public class Collection8Test extends JSR
850		assertNull(future.get(0L, MILLISECONDS));
851		}
852
853	+	/**
854	+	* Spliterators are either IMMUTABLE or truly late-binding or, if
855	+	* concurrent, use the same "late-binding style" of returning
856	+	* elements added between creation and first use.
857	+	*/
858	+	public void testLateBindingStyle() {
859	+	if (!testImplementationDetails) return;
860	+	if (impl.klazz() == ArrayList.class) return; // for jdk8
861	+	// Immutable (snapshot) spliterators are exempt
862	+	if (impl.emptyCollection().spliterator()
863	+	.hasCharacteristics(Spliterator.IMMUTABLE))
864	+	return;
865	+	final Object one = impl.makeElement(1);
866	+	{
867	+	final Collection c = impl.emptyCollection();
868	+	final Spliterator split = c.spliterator();
869	+	c.add(one);
870	+	assertTrue(split.tryAdvance(e -> { assertSame(e, one); }));
871	+	assertFalse(split.tryAdvance(e -> { throw new AssertionError(); }));
872	+	assertTrue(c.contains(one));
873	+	}
874	+	{
875	+	final AtomicLong count = new AtomicLong(0);
876	+	final Collection c = impl.emptyCollection();
877	+	final Spliterator split = c.spliterator();
878	+	c.add(one);
879	+	split.forEachRemaining(
880	+	e -> { assertSame(e, one); count.getAndIncrement(); });
881	+	assertEquals(1L, count.get());
882	+	assertFalse(split.tryAdvance(e -> { throw new AssertionError(); }));
883	+	assertTrue(c.contains(one));
884	+	}
885	+	}
886	+
887	+	/**
888	+	* Spliterator.getComparator throws IllegalStateException iff the
889	+	* spliterator does not report SORTED.
890	+	*/
891	+	public void testGetComparator_IllegalStateException() {
892	+	Collection c = impl.emptyCollection();
893	+	Spliterator s = c.spliterator();
894	+	boolean reportsSorted = s.hasCharacteristics(Spliterator.SORTED);
895	+	try {
896	+	s.getComparator();
897	+	assertTrue(reportsSorted);
898	+	} catch (IllegalStateException ex) {
899	+	assertFalse(reportsSorted);
900	+	}
901	+	}
902	+
903	+	public void testCollectionCopies() throws Exception {
904	+	ThreadLocalRandom rnd = ThreadLocalRandom.current();
905	+	Collection c = impl.emptyCollection();
906	+	for (int n = rnd.nextInt(4); n--> 0; )
907	+	c.add(impl.makeElement(rnd.nextInt()));
908	+	assertEquals(c, c);
909	+	if (c instanceof List)
910	+	assertCollectionsEquals(c, new ArrayList(c));
911	+	else if (c instanceof Set)
912	+	assertCollectionsEquals(c, new HashSet(c));
913	+	else if (c instanceof Deque)
914	+	assertCollectionsEquivalent(c, new ArrayDeque(c));
915	+
916	+	Collection clone = cloneableClone(c);
917	+	if (clone != null) {
918	+	assertSame(c.getClass(), clone.getClass());
919	+	assertCollectionsEquivalent(c, clone);
920	+	}
921	+	try {
922	+	Collection serialClone = serialClonePossiblyFailing(c);
923	+	assertSame(c.getClass(), serialClone.getClass());
924	+	assertCollectionsEquivalent(c, serialClone);
925	+	} catch (java.io.NotSerializableException acceptable) {}
926	+	}
927	+
928	+	/**
929	+	* TODO: move out of limbo
930	+	* 8203662: remove increment of modCount from ArrayList and Vector replaceAll()
931	+	*/
932	+	public void DISABLED_testReplaceAllIsNotStructuralModification() {
933	+	Collection c = impl.emptyCollection();
934	+	if (!(c instanceof List))
935	+	return;
936	+	List list = (List) c;
937	+	ThreadLocalRandom rnd = ThreadLocalRandom.current();
938	+	for (int n = rnd.nextInt(2, 10); n--> 0; )
939	+	list.add(impl.makeElement(rnd.nextInt()));
940	+	ArrayList copy = new ArrayList(list);
941	+	int size = list.size(), half = size / 2;
942	+	Iterator it = list.iterator();
943	+	for (int i = 0; i < half; i++)
944	+	assertEquals(it.next(), copy.get(i));
945	+	list.replaceAll(n -> n);
946	+	// ConcurrentModificationException must not be thrown here.
947	+	for (int i = half; i < size; i++)
948	+	assertEquals(it.next(), copy.get(i));
949	+	}
950	+
951		//     public void testCollection8DebugFail() {
952		//         fail(impl.klazz().getSimpleName());
953		//     }

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