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

Comparing jsr166/src/test/tck/Collection8Test.java (file contents):
Revision 1.18 by jsr166, Sun Nov 6 20:53:53 2016 UTC vs.
Revision 1.53 by jsr166, Sun May 6 22:09:42 2018 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 98 | Line 133 | public class Collection8Test extends JSR
133		assertSame(3, a[2]);
134		}
135		assertIteratorExhausted(c.iterator());
136	<	Consumer alwaysThrows = (e) -> { throw new AssertionError(); };
136	>	Consumer alwaysThrows = e -> { throw new AssertionError(); };
137		c.forEach(alwaysThrows);
138		c.iterator().forEachRemaining(alwaysThrows);
139		c.spliterator().forEachRemaining(alwaysThrows);
#	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 237 | Line 272 | public class Collection8Test extends JSR
272		() -> d.pop(),
273		() -> d.descendingIterator().next());
274		}
275	+	if (c instanceof List) {
276	+	List x = (List) c;
277	+	assertThrows(
278	+	NoSuchElementException.class,
279	+	() -> x.iterator().next(),
280	+	() -> x.listIterator().next(),
281	+	() -> x.listIterator(0).next(),
282	+	() -> x.listIterator().previous(),
283	+	() -> x.listIterator(0).previous());
284	+	}
285		}
286
287		public void testRemoveIf() {
288		Collection c = impl.emptyCollection();
289	+	boolean ordered =
290	+	c.spliterator().hasCharacteristics(Spliterator.ORDERED);
291		ThreadLocalRandom rnd = ThreadLocalRandom.current();
292		int n = rnd.nextInt(6);
293		for (int i = 0; i < n; i++) c.add(impl.makeElement(i));
#	Line 256 | Line 303 | public class Collection8Test extends JSR
303		ArrayList accepts = new ArrayList();
304		ArrayList rejects = new ArrayList();
305
306	<	Predicate randomPredicate = (e) -> {
306	>	Predicate randomPredicate = e -> {
307		assertNull(threwAt.get());
308		switch (rnd.nextInt(3)) {
309		case 0: accepts.add(e); return true;
#	Line 272 | Line 319 | public class Collection8Test extends JSR
319		assertEquals(modified, accepts.size() > 0);
320		assertEquals(modified, rejects.size() != n);
321		assertEquals(accepts.size() + rejects.size(), n);
322	<	assertEquals(rejects, Arrays.asList(c.toArray()));
322	>	if (ordered) {
323	>	assertEquals(rejects,
324	>	Arrays.asList(c.toArray()));
325	>	} else {
326	>	assertEquals(new HashSet(rejects),
327	>	new HashSet(Arrays.asList(c.toArray())));
328	>	}
329		} catch (ArithmeticException ok) {
330		assertNotNull(threwAt.get());
331		assertTrue(c.contains(threwAt.get()));
#	Line 283 | Line 336 | public class Collection8Test extends JSR
336		switch (rnd.nextInt(4)) {
337		case 0: survivors.addAll(c); break;
338		case 1: survivors.addAll(Arrays.asList(c.toArray())); break;
339	<	case 2: c.forEach(e -> survivors.add(e)); break;
339	>	case 2: c.forEach(survivors::add); break;
340		case 3: for (Object e : c) survivors.add(e); break;
341		}
342		assertTrue(orig.containsAll(accepts));
#	Line 293 | Line 346 | public class Collection8Test extends JSR
346		assertTrue(c.containsAll(rejects));
347		assertTrue(c.containsAll(survivors));
348		assertTrue(survivors.containsAll(rejects));
349	<	assertEquals(n - accepts.size(), c.size());
350	<	for (Object x : accepts) assertFalse(c.contains(x));
349	>	if (threwAt.get() == null) {
350	>	assertEquals(n - accepts.size(), c.size());
351	>	for (Object x : accepts) assertFalse(c.contains(x));
352	>	} else {
353	>	// Two acceptable behaviors: entire removeIf call is one
354	>	// transaction, or each element processed is one transaction.
355	>	assertTrue(n == c.size() || n == c.size() + accepts.size());
356	>	int k = 0;
357	>	for (Object x : accepts) if (c.contains(x)) k++;
358	>	assertTrue(k == accepts.size() || k == 0);
359	>	}
360		} catch (Throwable ex) {
361		System.err.println(impl.klazz());
362	<	System.err.printf("c=%s%n", c);
362	>	// c is at risk of corruption if we got here, so be lenient
363	>	try { System.err.printf("c=%s%n", c); }
364	>	catch (Throwable t) { t.printStackTrace(); }
365		System.err.printf("n=%d%n", n);
366		System.err.printf("orig=%s%n", orig);
367		System.err.printf("accepts=%s%n", accepts);
#	Line 309 | Line 373 | public class Collection8Test extends JSR
373		}
374
375		/**
376	+	* All elements removed in the middle of CONCURRENT traversal.
377	+	*/
378	+	public void testElementRemovalDuringTraversal() {
379	+	Collection c = impl.emptyCollection();
380	+	ThreadLocalRandom rnd = ThreadLocalRandom.current();
381	+	int n = rnd.nextInt(6);
382	+	ArrayList copy = new ArrayList();
383	+	for (int i = 0; i < n; i++) {
384	+	Object x = impl.makeElement(i);
385	+	copy.add(x);
386	+	c.add(x);
387	+	}
388	+	ArrayList iterated = new ArrayList();
389	+	ArrayList spliterated = new ArrayList();
390	+	Spliterator s = c.spliterator();
391	+	Iterator it = c.iterator();
392	+	for (int i = rnd.nextInt(n + 1); --i >= 0; ) {
393	+	assertTrue(s.tryAdvance(spliterated::add));
394	+	if (rnd.nextBoolean()) assertTrue(it.hasNext());
395	+	iterated.add(it.next());
396	+	}
397	+	Consumer alwaysThrows = e -> { throw new AssertionError(); };
398	+	if (s.hasCharacteristics(Spliterator.CONCURRENT)) {
399	+	c.clear();          // TODO: many more removal methods
400	+	if (testImplementationDetails
401	+	&& !(c instanceof java.util.concurrent.ArrayBlockingQueue)) {
402	+	if (rnd.nextBoolean())
403	+	assertFalse(s.tryAdvance(alwaysThrows));
404	+	else
405	+	s.forEachRemaining(alwaysThrows);
406	+	}
407	+	if (it.hasNext()) iterated.add(it.next());
408	+	if (rnd.nextBoolean()) assertIteratorExhausted(it);
409	+	}
410	+	assertTrue(copy.containsAll(iterated));
411	+	assertTrue(copy.containsAll(spliterated));
412	+	}
413	+
414	+	/**
415	+	* Some elements randomly disappear in the middle of traversal.
416	+	*/
417	+	public void testRandomElementRemovalDuringTraversal() {
418	+	Collection c = impl.emptyCollection();
419	+	ThreadLocalRandom rnd = ThreadLocalRandom.current();
420	+	int n = rnd.nextInt(6);
421	+	ArrayList copy = new ArrayList();
422	+	for (int i = 0; i < n; i++) {
423	+	Object x = impl.makeElement(i);
424	+	copy.add(x);
425	+	c.add(x);
426	+	}
427	+	ArrayList iterated = new ArrayList();
428	+	ArrayList spliterated = new ArrayList();
429	+	ArrayList removed = new ArrayList();
430	+	Spliterator s = c.spliterator();
431	+	Iterator it = c.iterator();
432	+	if (! (s.hasCharacteristics(Spliterator.CONCURRENT) ||
433	+	s.hasCharacteristics(Spliterator.IMMUTABLE)))
434	+	return;
435	+	for (int i = rnd.nextInt(n + 1); --i >= 0; ) {
436	+	assertTrue(s.tryAdvance(e -> {}));
437	+	if (rnd.nextBoolean()) assertTrue(it.hasNext());
438	+	it.next();
439	+	}
440	+	Consumer alwaysThrows = e -> { throw new AssertionError(); };
441	+	// TODO: many more removal methods
442	+	if (rnd.nextBoolean()) {
443	+	for (Iterator z = c.iterator(); z.hasNext(); ) {
444	+	Object e = z.next();
445	+	if (rnd.nextBoolean()) {
446	+	try {
447	+	z.remove();
448	+	} catch (UnsupportedOperationException ok) { return; }
449	+	removed.add(e);
450	+	}
451	+	}
452	+	} else {
453	+	Predicate randomlyRemove = e -> {
454	+	if (rnd.nextBoolean()) { removed.add(e); return true; }
455	+	else return false;
456	+	};
457	+	c.removeIf(randomlyRemove);
458	+	}
459	+	s.forEachRemaining(spliterated::add);
460	+	while (it.hasNext())
461	+	iterated.add(it.next());
462	+	assertTrue(copy.containsAll(iterated));
463	+	assertTrue(copy.containsAll(spliterated));
464	+	assertTrue(copy.containsAll(removed));
465	+	if (s.hasCharacteristics(Spliterator.CONCURRENT)) {
466	+	ArrayList iteratedAndRemoved = new ArrayList(iterated);
467	+	ArrayList spliteratedAndRemoved = new ArrayList(spliterated);
468	+	iteratedAndRemoved.retainAll(removed);
469	+	spliteratedAndRemoved.retainAll(removed);
470	+	assertTrue(iteratedAndRemoved.size() <= 1);
471	+	assertTrue(spliteratedAndRemoved.size() <= 1);
472	+	if (testImplementationDetails
473	+	&& !(c instanceof java.util.concurrent.ArrayBlockingQueue))
474	+	assertTrue(spliteratedAndRemoved.isEmpty());
475	+	}
476	+	}
477	+
478	+	/**
479		* Various ways of traversing a collection yield same elements
480		*/
481	<	public void testIteratorEquivalence() {
481	>	public void testTraversalEquivalence() {
482		Collection c = impl.emptyCollection();
483		ThreadLocalRandom rnd = ThreadLocalRandom.current();
484		int n = rnd.nextInt(6);
#	Line 320 | Line 487 | public class Collection8Test extends JSR
487		ArrayList iteratedForEachRemaining = new ArrayList();
488		ArrayList tryAdvanced = new ArrayList();
489		ArrayList spliterated = new ArrayList();
490	+	ArrayList splitonced = new ArrayList();
491		ArrayList forEached = new ArrayList();
492	+	ArrayList streamForEached = new ArrayList();
493	+	ConcurrentLinkedQueue parallelStreamForEached = new ConcurrentLinkedQueue();
494		ArrayList removeIfed = new ArrayList();
495		for (Object x : c) iterated.add(x);
496	<	c.iterator().forEachRemaining(e -> iteratedForEachRemaining.add(e));
496	>	c.iterator().forEachRemaining(iteratedForEachRemaining::add);
497		for (Spliterator s = c.spliterator();
498	<	s.tryAdvance(e -> tryAdvanced.add(e)); ) {}
499	<	c.spliterator().forEachRemaining(e -> spliterated.add(e));
500	<	c.forEach(e -> forEached.add(e));
498	>	s.tryAdvance(tryAdvanced::add); ) {}
499	>	c.spliterator().forEachRemaining(spliterated::add);
500	>	{                       // trySplit returns "strict prefix"
501	>	Spliterator s1 = c.spliterator(), s2 = s1.trySplit();
502	>	if (s2 != null) s2.forEachRemaining(splitonced::add);
503	>	s1.forEachRemaining(splitonced::add);
504	>	}
505	>	c.forEach(forEached::add);
506	>	c.stream().forEach(streamForEached::add);
507	>	c.parallelStream().forEach(parallelStreamForEached::add);
508		c.removeIf(e -> { removeIfed.add(e); return false; });
509		boolean ordered =
510		c.spliterator().hasCharacteristics(Spliterator.ORDERED);
511		if (c instanceof List || c instanceof Deque)
512		assertTrue(ordered);
513	+	HashSet cset = new HashSet(c);
514	+	assertEquals(cset, new HashSet(parallelStreamForEached));
515		if (ordered) {
516		assertEquals(iterated, iteratedForEachRemaining);
517		assertEquals(iterated, tryAdvanced);
518		assertEquals(iterated, spliterated);
519	+	assertEquals(iterated, splitonced);
520		assertEquals(iterated, forEached);
521	+	assertEquals(iterated, streamForEached);
522		assertEquals(iterated, removeIfed);
523		} else {
343	–	HashSet cset = new HashSet(c);
524		assertEquals(cset, new HashSet(iterated));
525		assertEquals(cset, new HashSet(iteratedForEachRemaining));
526		assertEquals(cset, new HashSet(tryAdvanced));
527		assertEquals(cset, new HashSet(spliterated));
528	+	assertEquals(cset, new HashSet(splitonced));
529		assertEquals(cset, new HashSet(forEached));
530	+	assertEquals(cset, new HashSet(streamForEached));
531		assertEquals(cset, new HashSet(removeIfed));
532		}
533		if (c instanceof Deque) {
#	Line 364 | Line 546 | public class Collection8Test extends JSR
546		}
547
548		/**
549	+	* Iterator.forEachRemaining has same behavior as Iterator's
550	+	* default implementation.
551	+	*/
552	+	public void testForEachRemainingConsistentWithDefaultImplementation() {
553	+	Collection c = impl.emptyCollection();
554	+	if (!testImplementationDetails
555	+	|| c.getClass() == java.util.LinkedList.class)
556	+	return;
557	+	ThreadLocalRandom rnd = ThreadLocalRandom.current();
558	+	int n = 1 + rnd.nextInt(3);
559	+	for (int i = 0; i < n; i++) c.add(impl.makeElement(i));
560	+	ArrayList iterated = new ArrayList();
561	+	ArrayList iteratedForEachRemaining = new ArrayList();
562	+	Iterator it1 = c.iterator();
563	+	Iterator it2 = c.iterator();
564	+	assertTrue(it1.hasNext());
565	+	assertTrue(it2.hasNext());
566	+	c.clear();
567	+	Object r1, r2;
568	+	try {
569	+	while (it1.hasNext()) iterated.add(it1.next());
570	+	r1 = iterated;
571	+	} catch (ConcurrentModificationException ex) {
572	+	r1 = ConcurrentModificationException.class;
573	+	assertFalse(impl.isConcurrent());
574	+	}
575	+	try {
576	+	it2.forEachRemaining(iteratedForEachRemaining::add);
577	+	r2 = iteratedForEachRemaining;
578	+	} catch (ConcurrentModificationException ex) {
579	+	r2 = ConcurrentModificationException.class;
580	+	assertFalse(impl.isConcurrent());
581	+	}
582	+	assertEquals(r1, r2);
583	+	}
584	+
585	+	/**
586		* Calling Iterator#remove() after Iterator#forEachRemaining
587	<	* should remove last element
587	>	* should (maybe) remove last element
588		*/
589		public void testRemoveAfterForEachRemaining() {
590		Collection c = impl.emptyCollection();
591		ThreadLocalRandom rnd = ThreadLocalRandom.current();
592	<	{
592	>	ArrayList copy = new ArrayList();
593	>	boolean ordered = c.spliterator().hasCharacteristics(Spliterator.ORDERED);
594	>	testCollection: {
595		int n = 3 + rnd.nextInt(2);
596	<	for (int i = 0; i < n; i++) c.add(impl.makeElement(i));
596	>	for (int i = 0; i < n; i++) {
597	>	Object x = impl.makeElement(i);
598	>	c.add(x);
599	>	copy.add(x);
600	>	}
601		Iterator it = c.iterator();
602	<	assertTrue(it.hasNext());
603	<	assertEquals(impl.makeElement(0), it.next());
604	<	assertTrue(it.hasNext());
605	<	assertEquals(impl.makeElement(1), it.next());
606	<	it.forEachRemaining((e) -> {});
607	<	it.remove();
608	<	assertEquals(n - 1, c.size());
609	<	for (int i = 0; i < n - 1; i++)
610	<	assertTrue(c.contains(impl.makeElement(i)));
611	<	assertFalse(c.contains(impl.makeElement(n - 1)));
602	>	if (ordered) {
603	>	if (rnd.nextBoolean()) assertTrue(it.hasNext());
604	>	assertEquals(impl.makeElement(0), it.next());
605	>	if (rnd.nextBoolean()) assertTrue(it.hasNext());
606	>	assertEquals(impl.makeElement(1), it.next());
607	>	} else {
608	>	if (rnd.nextBoolean()) assertTrue(it.hasNext());
609	>	assertTrue(copy.contains(it.next()));
610	>	if (rnd.nextBoolean()) assertTrue(it.hasNext());
611	>	assertTrue(copy.contains(it.next()));
612	>	}
613	>	it.forEachRemaining(
614	>	e -> {
615	>	assertTrue(c.contains(e));
616	>	assertTrue(copy.contains(e));});
617	>	if (testImplementationDetails) {
618	>	if (c instanceof java.util.concurrent.ArrayBlockingQueue) {
619	>	assertIteratorExhausted(it);
620	>	} else {
621	>	try { it.remove(); }
622	>	catch (UnsupportedOperationException ok) {
623	>	break testCollection;
624	>	}
625	>	assertEquals(n - 1, c.size());
626	>	if (ordered) {
627	>	for (int i = 0; i < n - 1; i++)
628	>	assertTrue(c.contains(impl.makeElement(i)));
629	>	assertFalse(c.contains(impl.makeElement(n - 1)));
630	>	}
631	>	}
632	>	}
633		}
634		if (c instanceof Deque) {
635		Deque d = (Deque) impl.emptyCollection();
636	+	assertTrue(ordered);
637		int n = 3 + rnd.nextInt(2);
638		for (int i = 0; i < n; i++) d.add(impl.makeElement(i));
639		Iterator it = d.descendingIterator();
#	Line 394 | Line 641 | public class Collection8Test extends JSR
641		assertEquals(impl.makeElement(n - 1), it.next());
642		assertTrue(it.hasNext());
643		assertEquals(impl.makeElement(n - 2), it.next());
644	<	it.forEachRemaining((e) -> {});
645	<	it.remove();
646	<	assertEquals(n - 1, d.size());
647	<	for (int i = 1; i < n; i++)
648	<	assertTrue(d.contains(impl.makeElement(i)));
649	<	assertFalse(d.contains(impl.makeElement(0)));
644	>	it.forEachRemaining(e -> assertTrue(c.contains(e)));
645	>	if (testImplementationDetails) {
646	>	it.remove();
647	>	assertEquals(n - 1, d.size());
648	>	for (int i = 1; i < n; i++)
649	>	assertTrue(d.contains(impl.makeElement(i)));
650	>	assertFalse(d.contains(impl.makeElement(0)));
651	>	}
652		}
653		}
654
#	Line 412 | Line 661 | public class Collection8Test extends JSR
661		final Object x = impl.makeElement(1);
662		final Object y = impl.makeElement(2);
663		final ArrayList found = new ArrayList();
664	<	Consumer<Object> spy = (o) -> { found.add(o); };
664	>	Consumer<Object> spy = o -> found.add(o);
665		c.stream().forEach(spy);
666		assertTrue(found.isEmpty());
667
#	Line 446 | Line 695 | public class Collection8Test extends JSR
695		Runnable checkElt = () -> {
696		threadsStarted.countDown();
697		while (!done.get())
698	<	c.stream().forEach((x) -> { assertSame(x, elt); }); };
698	>	c.stream().forEach(x -> assertSame(x, elt)); };
699		Runnable addRemove = () -> {
700		threadsStarted.countDown();
701		while (!done.get()) {
#	Line 470 | Line 719 | public class Collection8Test extends JSR
719		final Object x = impl.makeElement(1);
720		final Object y = impl.makeElement(2);
721		final ArrayList found = new ArrayList();
722	<	Consumer<Object> spy = (o) -> { found.add(o); };
722	>	Consumer<Object> spy = o -> found.add(o);
723		c.forEach(spy);
724		assertTrue(found.isEmpty());
725
#	Line 491 | Line 740 | public class Collection8Test extends JSR
740		assertTrue(found.isEmpty());
741		}
742
743	<	public void testForEachConcurrentStressTest() throws Throwable {
743	>	/** TODO: promote to a common utility */
744	>	static <T> T chooseOne(T ... ts) {
745	>	return ts[ThreadLocalRandom.current().nextInt(ts.length)];
746	>	}
747	>
748	>	/** TODO: more random adders and removers */
749	>	static <E> Runnable adderRemover(Collection<E> c, E e) {
750	>	return chooseOne(
751	>	() -> {
752	>	assertTrue(c.add(e));
753	>	assertTrue(c.contains(e));
754	>	assertTrue(c.remove(e));
755	>	assertFalse(c.contains(e));
756	>	},
757	>	() -> {
758	>	assertTrue(c.add(e));
759	>	assertTrue(c.contains(e));
760	>	assertTrue(c.removeIf(x -> x == e));
761	>	assertFalse(c.contains(e));
762	>	},
763	>	() -> {
764	>	assertTrue(c.add(e));
765	>	assertTrue(c.contains(e));
766	>	for (Iterator it = c.iterator();; )
767	>	if (it.next() == e) {
768	>	try { it.remove(); }
769	>	catch (UnsupportedOperationException ok) {
770	>	c.remove(e);
771	>	}
772	>	break;
773	>	}
774	>	assertFalse(c.contains(e));
775	>	});
776	>	}
777	>
778	>	/**
779	>	* Concurrent Spliterators, once exhausted, stay exhausted.
780	>	*/
781	>	public void testStickySpliteratorExhaustion() throws Throwable {
782		if (!impl.isConcurrent()) return;
783	+	if (!testImplementationDetails) return;
784	+	final ThreadLocalRandom rnd = ThreadLocalRandom.current();
785	+	final Consumer alwaysThrows = e -> { throw new AssertionError(); };
786		final Collection c = impl.emptyCollection();
787	<	final long testDurationMillis = timeoutMillis();
787	>	final Spliterator s = c.spliterator();
788	>	if (rnd.nextBoolean()) {
789	>	assertFalse(s.tryAdvance(alwaysThrows));
790	>	} else {
791	>	s.forEachRemaining(alwaysThrows);
792	>	}
793	>	final Object one = impl.makeElement(1);
794	>	// Spliterator should not notice added element
795	>	c.add(one);
796	>	if (rnd.nextBoolean()) {
797	>	assertFalse(s.tryAdvance(alwaysThrows));
798	>	} else {
799	>	s.forEachRemaining(alwaysThrows);
800	>	}
801	>	}
802	>
803	>	/**
804	>	* Motley crew of threads concurrently randomly hammer the collection.
805	>	*/
806	>	public void testDetectRaces() throws Throwable {
807	>	if (!impl.isConcurrent()) return;
808	>	final ThreadLocalRandom rnd = ThreadLocalRandom.current();
809	>	final Collection c = impl.emptyCollection();
810	>	final long testDurationMillis
811	>	= expensiveTests ? LONG_DELAY_MS : timeoutMillis();
812		final AtomicBoolean done = new AtomicBoolean(false);
813	<	final Object elt = impl.makeElement(1);
814	<	final Future<?> f1, f2;
813	>	final Object one = impl.makeElement(1);
814	>	final Object two = impl.makeElement(2);
815	>	final Consumer checkSanity = x -> assertTrue(x == one || x == two);
816	>	final Consumer<Object[]> checkArraySanity = array -> {
817	>	// assertTrue(array.length <= 2); // duplicates are permitted
818	>	for (Object x : array) assertTrue(x == one || x == two);
819	>	};
820	>	final Object[] emptyArray =
821	>	(Object[]) java.lang.reflect.Array.newInstance(one.getClass(), 0);
822	>	final List<Future<?>> futures;
823	>	final Phaser threadsStarted = new Phaser(1); // register this thread
824	>	final Runnable[] frobbers = {
825	>	() -> c.forEach(checkSanity),
826	>	() -> c.stream().forEach(checkSanity),
827	>	() -> c.parallelStream().forEach(checkSanity),
828	>	() -> c.spliterator().trySplit(),
829	>	() -> {
830	>	Spliterator s = c.spliterator();
831	>	s.tryAdvance(checkSanity);
832	>	s.trySplit();
833	>	},
834	>	() -> {
835	>	Spliterator s = c.spliterator();
836	>	do {} while (s.tryAdvance(checkSanity));
837	>	},
838	>	() -> { for (Object x : c) checkSanity.accept(x); },
839	>	() -> checkArraySanity.accept(c.toArray()),
840	>	() -> checkArraySanity.accept(c.toArray(emptyArray)),
841	>	() -> {
842	>	Object[] a = new Object[5];
843	>	Object three = impl.makeElement(3);
844	>	Arrays.fill(a, 0, a.length, three);
845	>	Object[] x = c.toArray(a);
846	>	if (x == a)
847	>	for (int i = 0; i < a.length && a[i] != null; i++)
848	>	checkSanity.accept(a[i]);
849	>	// A careful reading of the spec does not support:
850	>	// for (i++; i < a.length; i++) assertSame(three, a[i]);
851	>	else
852	>	checkArraySanity.accept(x);
853	>	},
854	>	adderRemover(c, one),
855	>	adderRemover(c, two),
856	>	};
857	>	final List<Runnable> tasks =
858	>	Arrays.stream(frobbers)
859	>	.filter(task -> rnd.nextBoolean()) // random subset
860	>	.map(task -> (Runnable) () -> {
861	>	threadsStarted.arriveAndAwaitAdvance();
862	>	while (!done.get())
863	>	task.run();
864	>	})
865	>	.collect(Collectors.toList());
866		final ExecutorService pool = Executors.newCachedThreadPool();
867		try (PoolCleaner cleaner = cleaner(pool, done)) {
868	<	final CountDownLatch threadsStarted = new CountDownLatch(2);
869	<	Runnable checkElt = () -> {
870	<	threadsStarted.countDown();
871	<	while (!done.get())
872	<	c.forEach((x) -> { assertSame(x, elt); }); };
508	<	Runnable addRemove = () -> {
509	<	threadsStarted.countDown();
510	<	while (!done.get()) {
511	<	assertTrue(c.add(elt));
512	<	assertTrue(c.remove(elt));
513	<	}};
514	<	f1 = pool.submit(checkElt);
515	<	f2 = pool.submit(addRemove);
868	>	threadsStarted.bulkRegister(tasks.size());
869	>	futures = tasks.stream()
870	>	.map(pool::submit)
871	>	.collect(Collectors.toList());
872	>	threadsStarted.arriveAndDeregister();
873		Thread.sleep(testDurationMillis);
874		}
875	<	assertNull(f1.get(0L, MILLISECONDS));
876	<	assertNull(f2.get(0L, MILLISECONDS));
875	>	for (Future future : futures)
876	>	assertNull(future.get(0L, MILLISECONDS));
877	>	}
878	>
879	>	/**
880	>	* Spliterators are either IMMUTABLE or truly late-binding or, if
881	>	* concurrent, use the same "late-binding style" of returning
882	>	* elements added between creation and first use.
883	>	*/
884	>	public void testLateBindingStyle() {
885	>	if (!testImplementationDetails) return;
886	>	if (impl.klazz() == ArrayList.class) return; // for jdk8
887	>	// Immutable (snapshot) spliterators are exempt
888	>	if (impl.emptyCollection().spliterator()
889	>	.hasCharacteristics(Spliterator.IMMUTABLE))
890	>	return;
891	>	final Object one = impl.makeElement(1);
892	>	{
893	>	final Collection c = impl.emptyCollection();
894	>	final Spliterator split = c.spliterator();
895	>	c.add(one);
896	>	assertTrue(split.tryAdvance(e -> { assertSame(e, one); }));
897	>	assertFalse(split.tryAdvance(e -> { throw new AssertionError(); }));
898	>	assertTrue(c.contains(one));
899	>	}
900	>	{
901	>	final AtomicLong count = new AtomicLong(0);
902	>	final Collection c = impl.emptyCollection();
903	>	final Spliterator split = c.spliterator();
904	>	c.add(one);
905	>	split.forEachRemaining(
906	>	e -> { assertSame(e, one); count.getAndIncrement(); });
907	>	assertEquals(1L, count.get());
908	>	assertFalse(split.tryAdvance(e -> { throw new AssertionError(); }));
909	>	assertTrue(c.contains(one));
910	>	}
911	>	}
912	>
913	>	/**
914	>	* Spliterator.getComparator throws IllegalStateException iff the
915	>	* spliterator does not report SORTED.
916	>	*/
917	>	public void testGetComparator_IllegalStateException() {
918	>	Collection c = impl.emptyCollection();
919	>	Spliterator s = c.spliterator();
920	>	boolean reportsSorted = s.hasCharacteristics(Spliterator.SORTED);
921	>	try {
922	>	s.getComparator();
923	>	assertTrue(reportsSorted);
924	>	} catch (IllegalStateException ex) {
925	>	assertFalse(reportsSorted);
926	>	}
927	>	}
928	>
929	>	public void testCollectionCopies() throws Exception {
930	>	ThreadLocalRandom rnd = ThreadLocalRandom.current();
931	>	Collection c = impl.emptyCollection();
932	>	for (int n = rnd.nextInt(4); n--> 0; )
933	>	c.add(impl.makeElement(rnd.nextInt()));
934	>	assertEquals(c, c);
935	>	if (c instanceof List)
936	>	assertCollectionsEquals(c, new ArrayList(c));
937	>	else if (c instanceof Set)
938	>	assertCollectionsEquals(c, new HashSet(c));
939	>	else if (c instanceof Deque)
940	>	assertCollectionsEquivalent(c, new ArrayDeque(c));
941	>
942	>	Collection clone = cloneableClone(c);
943	>	if (clone != null) {
944	>	assertSame(c.getClass(), clone.getClass());
945	>	assertCollectionsEquivalent(c, clone);
946	>	}
947	>	try {
948	>	Collection serialClone = serialClonePossiblyFailing(c);
949	>	assertSame(c.getClass(), serialClone.getClass());
950	>	assertCollectionsEquivalent(c, serialClone);
951	>	} catch (java.io.NotSerializableException acceptable) {}
952	>	}
953	>
954	>	public void testReplaceAllIsNotStructuralModification() {
955	>	Collection c = impl.emptyCollection();
956	>	if (!(c instanceof List))
957	>	return;
958	>	List list = (List) c;
959	>	ThreadLocalRandom rnd = ThreadLocalRandom.current();
960	>	for (int n = rnd.nextInt(2, 10); n--> 0; )
961	>	list.add(impl.makeElement(rnd.nextInt()));
962	>	ArrayList copy = new ArrayList(list);
963	>	int size = list.size(), half = size / 2;
964	>	Iterator it = list.iterator();
965	>	for (int i = 0; i < half; i++)
966	>	assertEquals(it.next(), copy.get(i));
967	>	list.replaceAll(n -> n);
968	>	// ConcurrentModificationException must not be thrown here.
969	>	for (int i = half; i < size; i++)
970	>	assertEquals(it.next(), copy.get(i));
971		}
972
973		//     public void testCollection8DebugFail() {

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