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

Comparing jsr166/src/test/tck/Collection8Test.java (file contents):
Revision 1.3 by jsr166, Sun Oct 9 05:25:09 2016 UTC vs.
Revision 1.44 by jsr166, Sun Dec 18 20:47:28 2016 UTC

#	Line 5 | Line 5
5		* http://creativecommons.org/publicdomain/zero/1.0/
6		*/
7
8	+	import static java.util.concurrent.TimeUnit.HOURS;
9		import static java.util.concurrent.TimeUnit.MILLISECONDS;
10
11		import java.util.ArrayList;
12	+	import java.util.Arrays;
13		import java.util.Collection;
14		import java.util.Collections;
15	+	import java.util.ConcurrentModificationException;
16	+	import java.util.Deque;
17	+	import java.util.HashSet;
18	+	import java.util.Iterator;
19	+	import java.util.List;
20	+	import java.util.NoSuchElementException;
21	+	import java.util.Queue;
22	+	import java.util.Spliterator;
23	+	import java.util.concurrent.BlockingDeque;
24	+	import java.util.concurrent.BlockingQueue;
25	+	import java.util.concurrent.ConcurrentLinkedQueue;
26		import java.util.concurrent.CountDownLatch;
27		import java.util.concurrent.Executors;
28		import java.util.concurrent.ExecutorService;
29		import java.util.concurrent.Future;
30	+	import java.util.concurrent.Phaser;
31	+	import java.util.concurrent.ThreadLocalRandom;
32		import java.util.concurrent.atomic.AtomicBoolean;
33		import java.util.concurrent.atomic.AtomicLong;
34	+	import java.util.concurrent.atomic.AtomicReference;
35		import java.util.function.Consumer;
36	+	import java.util.function.Predicate;
37	+	import java.util.stream.Collectors;
38
39		import junit.framework.Test;
40
#	Line 39 | Line 57 | public class Collection8Test extends JSR
57		impl);
58		}
59
60	+	Object bomb() {
61	+	return new Object() {
62	+	public boolean equals(Object x) { throw new AssertionError(); }
63	+	public int hashCode() { throw new AssertionError(); }
64	+	};
65	+	}
66	+
67	+	/** Checks properties of empty collections. */
68	+	public void testEmptyMeansEmpty() throws Throwable {
69	+	Collection c = impl.emptyCollection();
70	+	emptyMeansEmpty(c);
71	+
72	+	if (c instanceof java.io.Serializable) {
73	+	try {
74	+	emptyMeansEmpty(serialClonePossiblyFailing(c));
75	+	} catch (java.io.NotSerializableException ex) {
76	+	// excusable when we have a serializable wrapper around
77	+	// a non-serializable collection, as can happen with:
78	+	// Vector.subList() => wrapped AbstractList$RandomAccessSubList
79	+	if (testImplementationDetails
80	+	&& (! c.getClass().getName().matches(
81	+	"java.util.Collections.*")))
82	+	throw ex;
83	+	}
84	+	}
85	+
86	+	Collection clone = cloneableClone(c);
87	+	if (clone != null)
88	+	emptyMeansEmpty(clone);
89	+	}
90	+
91	+	void emptyMeansEmpty(Collection c) throws InterruptedException {
92	+	assertTrue(c.isEmpty());
93	+	assertEquals(0, c.size());
94	+	assertEquals("[]", c.toString());
95	+	{
96	+	Object[] a = c.toArray();
97	+	assertEquals(0, a.length);
98	+	assertSame(Object[].class, a.getClass());
99	+	}
100	+	{
101	+	Object[] a = new Object[0];
102	+	assertSame(a, c.toArray(a));
103	+	}
104	+	{
105	+	Integer[] a = new Integer[0];
106	+	assertSame(a, c.toArray(a));
107	+	}
108	+	{
109	+	Integer[] a = { 1, 2, 3};
110	+	assertSame(a, c.toArray(a));
111	+	assertNull(a[0]);
112	+	assertSame(2, a[1]);
113	+	assertSame(3, a[2]);
114	+	}
115	+	assertIteratorExhausted(c.iterator());
116	+	Consumer alwaysThrows = e -> { throw new AssertionError(); };
117	+	c.forEach(alwaysThrows);
118	+	c.iterator().forEachRemaining(alwaysThrows);
119	+	c.spliterator().forEachRemaining(alwaysThrows);
120	+	assertFalse(c.spliterator().tryAdvance(alwaysThrows));
121	+	if (c.spliterator().hasCharacteristics(Spliterator.SIZED))
122	+	assertEquals(0, c.spliterator().estimateSize());
123	+	assertFalse(c.contains(bomb()));
124	+	assertFalse(c.remove(bomb()));
125	+	if (c instanceof Queue) {
126	+	Queue q = (Queue) c;
127	+	assertNull(q.peek());
128	+	assertNull(q.poll());
129	+	}
130	+	if (c instanceof Deque) {
131	+	Deque d = (Deque) c;
132	+	assertNull(d.peekFirst());
133	+	assertNull(d.peekLast());
134	+	assertNull(d.pollFirst());
135	+	assertNull(d.pollLast());
136	+	assertIteratorExhausted(d.descendingIterator());
137	+	d.descendingIterator().forEachRemaining(alwaysThrows);
138	+	assertFalse(d.removeFirstOccurrence(bomb()));
139	+	assertFalse(d.removeLastOccurrence(bomb()));
140	+	}
141	+	if (c instanceof BlockingQueue) {
142	+	BlockingQueue q = (BlockingQueue) c;
143	+	assertNull(q.poll(0L, MILLISECONDS));
144	+	}
145	+	if (c instanceof BlockingDeque) {
146	+	BlockingDeque q = (BlockingDeque) c;
147	+	assertNull(q.pollFirst(0L, MILLISECONDS));
148	+	assertNull(q.pollLast(0L, MILLISECONDS));
149	+	}
150	+	}
151	+
152	+	public void testNullPointerExceptions() throws InterruptedException {
153	+	Collection c = impl.emptyCollection();
154	+	assertThrows(
155	+	NullPointerException.class,
156	+	() -> c.addAll(null),
157	+	() -> c.containsAll(null),
158	+	() -> c.retainAll(null),
159	+	() -> c.removeAll(null),
160	+	() -> c.removeIf(null),
161	+	() -> c.forEach(null),
162	+	() -> c.iterator().forEachRemaining(null),
163	+	() -> c.spliterator().forEachRemaining(null),
164	+	() -> c.spliterator().tryAdvance(null),
165	+	() -> c.toArray(null));
166	+
167	+	if (!impl.permitsNulls()) {
168	+	assertThrows(
169	+	NullPointerException.class,
170	+	() -> c.add(null));
171	+	}
172	+	if (!impl.permitsNulls() && c instanceof Queue) {
173	+	Queue q = (Queue) c;
174	+	assertThrows(
175	+	NullPointerException.class,
176	+	() -> q.offer(null));
177	+	}
178	+	if (!impl.permitsNulls() && c instanceof Deque) {
179	+	Deque d = (Deque) c;
180	+	assertThrows(
181	+	NullPointerException.class,
182	+	() -> d.addFirst(null),
183	+	() -> d.addLast(null),
184	+	() -> d.offerFirst(null),
185	+	() -> d.offerLast(null),
186	+	() -> d.push(null),
187	+	() -> d.descendingIterator().forEachRemaining(null));
188	+	}
189	+	if (c instanceof BlockingQueue) {
190	+	BlockingQueue q = (BlockingQueue) c;
191	+	assertThrows(
192	+	NullPointerException.class,
193	+	() -> {
194	+	try { q.offer(null, 1L, HOURS); }
195	+	catch (InterruptedException ex) {
196	+	throw new AssertionError(ex);
197	+	}},
198	+	() -> {
199	+	try { q.put(null); }
200	+	catch (InterruptedException ex) {
201	+	throw new AssertionError(ex);
202	+	}});
203	+	}
204	+	if (c instanceof BlockingDeque) {
205	+	BlockingDeque q = (BlockingDeque) c;
206	+	assertThrows(
207	+	NullPointerException.class,
208	+	() -> {
209	+	try { q.offerFirst(null, 1L, HOURS); }
210	+	catch (InterruptedException ex) {
211	+	throw new AssertionError(ex);
212	+	}},
213	+	() -> {
214	+	try { q.offerLast(null, 1L, HOURS); }
215	+	catch (InterruptedException ex) {
216	+	throw new AssertionError(ex);
217	+	}},
218	+	() -> {
219	+	try { q.putFirst(null); }
220	+	catch (InterruptedException ex) {
221	+	throw new AssertionError(ex);
222	+	}},
223	+	() -> {
224	+	try { q.putLast(null); }
225	+	catch (InterruptedException ex) {
226	+	throw new AssertionError(ex);
227	+	}});
228	+	}
229	+	}
230	+
231	+	public void testNoSuchElementExceptions() {
232	+	Collection c = impl.emptyCollection();
233	+	assertThrows(
234	+	NoSuchElementException.class,
235	+	() -> c.iterator().next());
236	+
237	+	if (c instanceof Queue) {
238	+	Queue q = (Queue) c;
239	+	assertThrows(
240	+	NoSuchElementException.class,
241	+	() -> q.element(),
242	+	() -> q.remove());
243	+	}
244	+	if (c instanceof Deque) {
245	+	Deque d = (Deque) c;
246	+	assertThrows(
247	+	NoSuchElementException.class,
248	+	() -> d.getFirst(),
249	+	() -> d.getLast(),
250	+	() -> d.removeFirst(),
251	+	() -> d.removeLast(),
252	+	() -> d.pop(),
253	+	() -> d.descendingIterator().next());
254	+	}
255	+	}
256	+
257	+	public void testRemoveIf() {
258	+	Collection c = impl.emptyCollection();
259	+	boolean ordered =
260	+	c.spliterator().hasCharacteristics(Spliterator.ORDERED);
261	+	ThreadLocalRandom rnd = ThreadLocalRandom.current();
262	+	int n = rnd.nextInt(6);
263	+	for (int i = 0; i < n; i++) c.add(impl.makeElement(i));
264	+	AtomicReference threwAt = new AtomicReference(null);
265	+	List orig = rnd.nextBoolean()
266	+	? new ArrayList(c)
267	+	: Arrays.asList(c.toArray());
268	+
269	+	// Merely creating an iterator can change ArrayBlockingQueue behavior
270	+	Iterator it = rnd.nextBoolean() ? c.iterator() : null;
271	+
272	+	ArrayList survivors = new ArrayList();
273	+	ArrayList accepts = new ArrayList();
274	+	ArrayList rejects = new ArrayList();
275	+
276	+	Predicate randomPredicate = e -> {
277	+	assertNull(threwAt.get());
278	+	switch (rnd.nextInt(3)) {
279	+	case 0: accepts.add(e); return true;
280	+	case 1: rejects.add(e); return false;
281	+	case 2: threwAt.set(e); throw new ArithmeticException();
282	+	default: throw new AssertionError();
283	+	}
284	+	};
285	+	try {
286	+	try {
287	+	boolean modified = c.removeIf(randomPredicate);
288	+	assertNull(threwAt.get());
289	+	assertEquals(modified, accepts.size() > 0);
290	+	assertEquals(modified, rejects.size() != n);
291	+	assertEquals(accepts.size() + rejects.size(), n);
292	+	if (ordered) {
293	+	assertEquals(rejects,
294	+	Arrays.asList(c.toArray()));
295	+	} else {
296	+	assertEquals(new HashSet(rejects),
297	+	new HashSet(Arrays.asList(c.toArray())));
298	+	}
299	+	} catch (ArithmeticException ok) {
300	+	assertNotNull(threwAt.get());
301	+	assertTrue(c.contains(threwAt.get()));
302	+	}
303	+	if (it != null && impl.isConcurrent())
304	+	// check for weakly consistent iterator
305	+	while (it.hasNext()) assertTrue(orig.contains(it.next()));
306	+	switch (rnd.nextInt(4)) {
307	+	case 0: survivors.addAll(c); break;
308	+	case 1: survivors.addAll(Arrays.asList(c.toArray())); break;
309	+	case 2: c.forEach(survivors::add); break;
310	+	case 3: for (Object e : c) survivors.add(e); break;
311	+	}
312	+	assertTrue(orig.containsAll(accepts));
313	+	assertTrue(orig.containsAll(rejects));
314	+	assertTrue(orig.containsAll(survivors));
315	+	assertTrue(orig.containsAll(c));
316	+	assertTrue(c.containsAll(rejects));
317	+	assertTrue(c.containsAll(survivors));
318	+	assertTrue(survivors.containsAll(rejects));
319	+	if (threwAt.get() == null) {
320	+	assertEquals(n - accepts.size(), c.size());
321	+	for (Object x : accepts) assertFalse(c.contains(x));
322	+	} else {
323	+	// Two acceptable behaviors: entire removeIf call is one
324	+	// transaction, or each element processed is one transaction.
325	+	assertTrue(n == c.size() || n == c.size() + accepts.size());
326	+	int k = 0;
327	+	for (Object x : accepts) if (c.contains(x)) k++;
328	+	assertTrue(k == accepts.size() || k == 0);
329	+	}
330	+	} catch (Throwable ex) {
331	+	System.err.println(impl.klazz());
332	+	// c is at risk of corruption if we got here, so be lenient
333	+	try { System.err.printf("c=%s%n", c); }
334	+	catch (Throwable t) { t.printStackTrace(); }
335	+	System.err.printf("n=%d%n", n);
336	+	System.err.printf("orig=%s%n", orig);
337	+	System.err.printf("accepts=%s%n", accepts);
338	+	System.err.printf("rejects=%s%n", rejects);
339	+	System.err.printf("survivors=%s%n", survivors);
340	+	System.err.printf("threwAt=%s%n", threwAt.get());
341	+	throw ex;
342	+	}
343	+	}
344	+
345	+	/**
346	+	* All elements removed in the middle of CONCURRENT traversal.
347	+	*/
348	+	public void testElementRemovalDuringTraversal() {
349	+	Collection c = impl.emptyCollection();
350	+	ThreadLocalRandom rnd = ThreadLocalRandom.current();
351	+	int n = rnd.nextInt(6);
352	+	ArrayList copy = new ArrayList();
353	+	for (int i = 0; i < n; i++) {
354	+	Object x = impl.makeElement(i);
355	+	copy.add(x);
356	+	c.add(x);
357	+	}
358	+	ArrayList iterated = new ArrayList();
359	+	ArrayList spliterated = new ArrayList();
360	+	Spliterator s = c.spliterator();
361	+	Iterator it = c.iterator();
362	+	for (int i = rnd.nextInt(n + 1); --i >= 0; ) {
363	+	assertTrue(s.tryAdvance(spliterated::add));
364	+	if (rnd.nextBoolean()) assertTrue(it.hasNext());
365	+	iterated.add(it.next());
366	+	}
367	+	Consumer alwaysThrows = e -> { throw new AssertionError(); };
368	+	if (s.hasCharacteristics(Spliterator.CONCURRENT)) {
369	+	c.clear();          // TODO: many more removal methods
370	+	if (testImplementationDetails
371	+	&& !(c instanceof java.util.concurrent.ArrayBlockingQueue)) {
372	+	if (rnd.nextBoolean())
373	+	assertFalse(s.tryAdvance(alwaysThrows));
374	+	else
375	+	s.forEachRemaining(alwaysThrows);
376	+	}
377	+	if (it.hasNext()) iterated.add(it.next());
378	+	if (rnd.nextBoolean()) assertIteratorExhausted(it);
379	+	}
380	+	assertTrue(copy.containsAll(iterated));
381	+	assertTrue(copy.containsAll(spliterated));
382	+	}
383	+
384	+	/**
385	+	* Some elements randomly disappear in the middle of traversal.
386	+	*/
387	+	public void testRandomElementRemovalDuringTraversal() {
388	+	Collection c = impl.emptyCollection();
389	+	ThreadLocalRandom rnd = ThreadLocalRandom.current();
390	+	int n = rnd.nextInt(6);
391	+	ArrayList copy = new ArrayList();
392	+	for (int i = 0; i < n; i++) {
393	+	Object x = impl.makeElement(i);
394	+	copy.add(x);
395	+	c.add(x);
396	+	}
397	+	ArrayList iterated = new ArrayList();
398	+	ArrayList spliterated = new ArrayList();
399	+	ArrayList removed = new ArrayList();
400	+	Spliterator s = c.spliterator();
401	+	Iterator it = c.iterator();
402	+	if (! (s.hasCharacteristics(Spliterator.CONCURRENT) ||
403	+	s.hasCharacteristics(Spliterator.IMMUTABLE)))
404	+	return;
405	+	for (int i = rnd.nextInt(n + 1); --i >= 0; ) {
406	+	assertTrue(s.tryAdvance(e -> {}));
407	+	if (rnd.nextBoolean()) assertTrue(it.hasNext());
408	+	it.next();
409	+	}
410	+	Consumer alwaysThrows = e -> { throw new AssertionError(); };
411	+	// TODO: many more removal methods
412	+	if (rnd.nextBoolean()) {
413	+	for (Iterator z = c.iterator(); z.hasNext(); ) {
414	+	Object e = z.next();
415	+	if (rnd.nextBoolean()) {
416	+	try {
417	+	z.remove();
418	+	} catch (UnsupportedOperationException ok) { return; }
419	+	removed.add(e);
420	+	}
421	+	}
422	+	} else {
423	+	Predicate randomlyRemove = e -> {
424	+	if (rnd.nextBoolean()) { removed.add(e); return true; }
425	+	else return false;
426	+	};
427	+	c.removeIf(randomlyRemove);
428	+	}
429	+	s.forEachRemaining(spliterated::add);
430	+	while (it.hasNext())
431	+	iterated.add(it.next());
432	+	assertTrue(copy.containsAll(iterated));
433	+	assertTrue(copy.containsAll(spliterated));
434	+	assertTrue(copy.containsAll(removed));
435	+	if (s.hasCharacteristics(Spliterator.CONCURRENT)) {
436	+	ArrayList iteratedAndRemoved = new ArrayList(iterated);
437	+	ArrayList spliteratedAndRemoved = new ArrayList(spliterated);
438	+	iteratedAndRemoved.retainAll(removed);
439	+	spliteratedAndRemoved.retainAll(removed);
440	+	assertTrue(iteratedAndRemoved.size() <= 1);
441	+	assertTrue(spliteratedAndRemoved.size() <= 1);
442	+	if (testImplementationDetails
443	+	&& !(c instanceof java.util.concurrent.ArrayBlockingQueue))
444	+	assertTrue(spliteratedAndRemoved.isEmpty());
445	+	}
446	+	}
447	+
448	+	/**
449	+	* Various ways of traversing a collection yield same elements
450	+	*/
451	+	public void testTraversalEquivalence() {
452	+	Collection c = impl.emptyCollection();
453	+	ThreadLocalRandom rnd = ThreadLocalRandom.current();
454	+	int n = rnd.nextInt(6);
455	+	for (int i = 0; i < n; i++) c.add(impl.makeElement(i));
456	+	ArrayList iterated = new ArrayList();
457	+	ArrayList iteratedForEachRemaining = new ArrayList();
458	+	ArrayList tryAdvanced = new ArrayList();
459	+	ArrayList spliterated = new ArrayList();
460	+	ArrayList splitonced = new ArrayList();
461	+	ArrayList forEached = new ArrayList();
462	+	ArrayList streamForEached = new ArrayList();
463	+	ConcurrentLinkedQueue parallelStreamForEached = new ConcurrentLinkedQueue();
464	+	ArrayList removeIfed = new ArrayList();
465	+	for (Object x : c) iterated.add(x);
466	+	c.iterator().forEachRemaining(iteratedForEachRemaining::add);
467	+	for (Spliterator s = c.spliterator();
468	+	s.tryAdvance(tryAdvanced::add); ) {}
469	+	c.spliterator().forEachRemaining(spliterated::add);
470	+	{                       // trySplit returns "strict prefix"
471	+	Spliterator s1 = c.spliterator(), s2 = s1.trySplit();
472	+	if (s2 != null) s2.forEachRemaining(splitonced::add);
473	+	s1.forEachRemaining(splitonced::add);
474	+	}
475	+	c.forEach(forEached::add);
476	+	c.stream().forEach(streamForEached::add);
477	+	c.parallelStream().forEach(parallelStreamForEached::add);
478	+	c.removeIf(e -> { removeIfed.add(e); return false; });
479	+	boolean ordered =
480	+	c.spliterator().hasCharacteristics(Spliterator.ORDERED);
481	+	if (c instanceof List || c instanceof Deque)
482	+	assertTrue(ordered);
483	+	HashSet cset = new HashSet(c);
484	+	assertEquals(cset, new HashSet(parallelStreamForEached));
485	+	if (ordered) {
486	+	assertEquals(iterated, iteratedForEachRemaining);
487	+	assertEquals(iterated, tryAdvanced);
488	+	assertEquals(iterated, spliterated);
489	+	assertEquals(iterated, splitonced);
490	+	assertEquals(iterated, forEached);
491	+	assertEquals(iterated, streamForEached);
492	+	assertEquals(iterated, removeIfed);
493	+	} else {
494	+	assertEquals(cset, new HashSet(iterated));
495	+	assertEquals(cset, new HashSet(iteratedForEachRemaining));
496	+	assertEquals(cset, new HashSet(tryAdvanced));
497	+	assertEquals(cset, new HashSet(spliterated));
498	+	assertEquals(cset, new HashSet(splitonced));
499	+	assertEquals(cset, new HashSet(forEached));
500	+	assertEquals(cset, new HashSet(streamForEached));
501	+	assertEquals(cset, new HashSet(removeIfed));
502	+	}
503	+	if (c instanceof Deque) {
504	+	Deque d = (Deque) c;
505	+	ArrayList descending = new ArrayList();
506	+	ArrayList descendingForEachRemaining = new ArrayList();
507	+	for (Iterator it = d.descendingIterator(); it.hasNext(); )
508	+	descending.add(it.next());
509	+	d.descendingIterator().forEachRemaining(
510	+	e -> descendingForEachRemaining.add(e));
511	+	Collections.reverse(descending);
512	+	Collections.reverse(descendingForEachRemaining);
513	+	assertEquals(iterated, descending);
514	+	assertEquals(iterated, descendingForEachRemaining);
515	+	}
516	+	}
517	+
518	+	/**
519	+	* Iterator.forEachRemaining has same behavior as Iterator's
520	+	* default implementation.
521	+	*/
522	+	public void testForEachRemainingConsistentWithDefaultImplementation() {
523	+	Collection c = impl.emptyCollection();
524	+	if (!testImplementationDetails
525	+	|| c.getClass() == java.util.LinkedList.class)
526	+	return;
527	+	ThreadLocalRandom rnd = ThreadLocalRandom.current();
528	+	int n = 1 + rnd.nextInt(3);
529	+	for (int i = 0; i < n; i++) c.add(impl.makeElement(i));
530	+	ArrayList iterated = new ArrayList();
531	+	ArrayList iteratedForEachRemaining = new ArrayList();
532	+	Iterator it1 = c.iterator();
533	+	Iterator it2 = c.iterator();
534	+	assertTrue(it1.hasNext());
535	+	assertTrue(it2.hasNext());
536	+	c.clear();
537	+	Object r1, r2;
538	+	try {
539	+	while (it1.hasNext()) iterated.add(it1.next());
540	+	r1 = iterated;
541	+	} catch (ConcurrentModificationException ex) {
542	+	r1 = ConcurrentModificationException.class;
543	+	assertFalse(impl.isConcurrent());
544	+	}
545	+	try {
546	+	it2.forEachRemaining(iteratedForEachRemaining::add);
547	+	r2 = iteratedForEachRemaining;
548	+	} catch (ConcurrentModificationException ex) {
549	+	r2 = ConcurrentModificationException.class;
550	+	assertFalse(impl.isConcurrent());
551	+	}
552	+	assertEquals(r1, r2);
553	+	}
554	+
555	+	/**
556	+	* Calling Iterator#remove() after Iterator#forEachRemaining
557	+	* should (maybe) remove last element
558	+	*/
559	+	public void testRemoveAfterForEachRemaining() {
560	+	Collection c = impl.emptyCollection();
561	+	ThreadLocalRandom rnd = ThreadLocalRandom.current();
562	+	testCollection: {
563	+	int n = 3 + rnd.nextInt(2);
564	+	for (int i = 0; i < n; i++) c.add(impl.makeElement(i));
565	+	Iterator it = c.iterator();
566	+	assertTrue(it.hasNext());
567	+	assertEquals(impl.makeElement(0), it.next());
568	+	assertTrue(it.hasNext());
569	+	assertEquals(impl.makeElement(1), it.next());
570	+	it.forEachRemaining(e -> assertTrue(c.contains(e)));
571	+	if (testImplementationDetails) {
572	+	if (c instanceof java.util.concurrent.ArrayBlockingQueue) {
573	+	assertIteratorExhausted(it);
574	+	} else {
575	+	try { it.remove(); }
576	+	catch (UnsupportedOperationException ok) {
577	+	break testCollection;
578	+	}
579	+	assertEquals(n - 1, c.size());
580	+	for (int i = 0; i < n - 1; i++)
581	+	assertTrue(c.contains(impl.makeElement(i)));
582	+	assertFalse(c.contains(impl.makeElement(n - 1)));
583	+	}
584	+	}
585	+	}
586	+	if (c instanceof Deque) {
587	+	Deque d = (Deque) impl.emptyCollection();
588	+	int n = 3 + rnd.nextInt(2);
589	+	for (int i = 0; i < n; i++) d.add(impl.makeElement(i));
590	+	Iterator it = d.descendingIterator();
591	+	assertTrue(it.hasNext());
592	+	assertEquals(impl.makeElement(n - 1), it.next());
593	+	assertTrue(it.hasNext());
594	+	assertEquals(impl.makeElement(n - 2), it.next());
595	+	it.forEachRemaining(e -> assertTrue(c.contains(e)));
596	+	if (testImplementationDetails) {
597	+	it.remove();
598	+	assertEquals(n - 1, d.size());
599	+	for (int i = 1; i < n; i++)
600	+	assertTrue(d.contains(impl.makeElement(i)));
601	+	assertFalse(d.contains(impl.makeElement(0)));
602	+	}
603	+	}
604	+	}
605	+
606		/**
607		* stream().forEach returns elements in the collection
608		*/
#	Line 48 | Line 612 | public class Collection8Test extends JSR
612		final Object x = impl.makeElement(1);
613		final Object y = impl.makeElement(2);
614		final ArrayList found = new ArrayList();
615	<	Consumer<Object> spy = (o) -> { found.add(o); };
615	>	Consumer<Object> spy = o -> found.add(o);
616		c.stream().forEach(spy);
617		assertTrue(found.isEmpty());
618
#	Line 82 | Line 646 | public class Collection8Test extends JSR
646		Runnable checkElt = () -> {
647		threadsStarted.countDown();
648		while (!done.get())
649	<	c.stream().forEach((x) -> { assertSame(x, elt); }); };
649	>	c.stream().forEach(x -> assertSame(x, elt)); };
650		Runnable addRemove = () -> {
651		threadsStarted.countDown();
652		while (!done.get()) {
#	Line 106 | Line 670 | public class Collection8Test extends JSR
670		final Object x = impl.makeElement(1);
671		final Object y = impl.makeElement(2);
672		final ArrayList found = new ArrayList();
673	<	Consumer<Object> spy = (o) -> { found.add(o); };
673	>	Consumer<Object> spy = o -> found.add(o);
674		c.forEach(spy);
675		assertTrue(found.isEmpty());
676
#	Line 127 | Line 691 | public class Collection8Test extends JSR
691		assertTrue(found.isEmpty());
692		}
693
694	<	public void testForEachConcurrentStressTest() throws Throwable {
694	>	/** TODO: promote to a common utility */
695	>	static <T> T chooseOne(T ... ts) {
696	>	return ts[ThreadLocalRandom.current().nextInt(ts.length)];
697	>	}
698	>
699	>	/** TODO: more random adders and removers */
700	>	static <E> Runnable adderRemover(Collection<E> c, E e) {
701	>	return chooseOne(
702	>	() -> {
703	>	assertTrue(c.add(e));
704	>	assertTrue(c.contains(e));
705	>	assertTrue(c.remove(e));
706	>	assertFalse(c.contains(e));
707	>	},
708	>	() -> {
709	>	assertTrue(c.add(e));
710	>	assertTrue(c.contains(e));
711	>	assertTrue(c.removeIf(x -> x == e));
712	>	assertFalse(c.contains(e));
713	>	},
714	>	() -> {
715	>	assertTrue(c.add(e));
716	>	assertTrue(c.contains(e));
717	>	for (Iterator it = c.iterator();; )
718	>	if (it.next() == e) {
719	>	try { it.remove(); }
720	>	catch (UnsupportedOperationException ok) {
721	>	c.remove(e);
722	>	}
723	>	break;
724	>	}
725	>	assertFalse(c.contains(e));
726	>	});
727	>	}
728	>
729	>	/**
730	>	* Motley crew of threads concurrently randomly hammer the collection.
731	>	*/
732	>	public void testDetectRaces() throws Throwable {
733		if (!impl.isConcurrent()) return;
734	+	final ThreadLocalRandom rnd = ThreadLocalRandom.current();
735		final Collection c = impl.emptyCollection();
736	<	final long testDurationMillis = timeoutMillis();
736	>	final long testDurationMillis
737	>	= expensiveTests ? LONG_DELAY_MS : timeoutMillis();
738		final AtomicBoolean done = new AtomicBoolean(false);
739	<	final Object elt = impl.makeElement(1);
740	<	final Future<?> f1, f2;
739	>	final Object one = impl.makeElement(1);
740	>	final Object two = impl.makeElement(2);
741	>	final Consumer checkSanity = x -> assertTrue(x == one || x == two);
742	>	final Consumer<Object[]> checkArraySanity = array -> {
743	>	// assertTrue(array.length <= 2); // duplicates are permitted
744	>	for (Object x : array) assertTrue(x == one || x == two);
745	>	};
746	>	final Object[] emptyArray =
747	>	(Object[]) java.lang.reflect.Array.newInstance(one.getClass(), 0);
748	>	final List<Future<?>> futures;
749	>	final Phaser threadsStarted = new Phaser(1); // register this thread
750	>	final Runnable[] frobbers = {
751	>	() -> c.forEach(checkSanity),
752	>	() -> c.stream().forEach(checkSanity),
753	>	() -> c.parallelStream().forEach(checkSanity),
754	>	() -> c.spliterator().trySplit(),
755	>	() -> {
756	>	Spliterator s = c.spliterator();
757	>	s.tryAdvance(checkSanity);
758	>	s.trySplit();
759	>	},
760	>	() -> {
761	>	Spliterator s = c.spliterator();
762	>	do {} while (s.tryAdvance(checkSanity));
763	>	},
764	>	() -> { for (Object x : c) checkSanity.accept(x); },
765	>	() -> checkArraySanity.accept(c.toArray()),
766	>	() -> checkArraySanity.accept(c.toArray(emptyArray)),
767	>	() -> {
768	>	Object[] a = new Object[5];
769	>	Object three = impl.makeElement(3);
770	>	Arrays.fill(a, 0, a.length, three);
771	>	Object[] x = c.toArray(a);
772	>	if (x == a)
773	>	for (int i = 0; i < a.length && a[i] != null; i++)
774	>	checkSanity.accept(a[i]);
775	>	// A careful reading of the spec does not support:
776	>	// for (i++; i < a.length; i++) assertSame(three, a[i]);
777	>	else
778	>	checkArraySanity.accept(x);
779	>	},
780	>	adderRemover(c, one),
781	>	adderRemover(c, two),
782	>	};
783	>	final List<Runnable> tasks =
784	>	Arrays.stream(frobbers)
785	>	.filter(task -> rnd.nextBoolean()) // random subset
786	>	.map(task -> (Runnable) () -> {
787	>	threadsStarted.arriveAndAwaitAdvance();
788	>	while (!done.get())
789	>	task.run();
790	>	})
791	>	.collect(Collectors.toList());
792		final ExecutorService pool = Executors.newCachedThreadPool();
793		try (PoolCleaner cleaner = cleaner(pool, done)) {
794	<	final CountDownLatch threadsStarted = new CountDownLatch(2);
795	<	Runnable checkElt = () -> {
796	<	threadsStarted.countDown();
797	<	while (!done.get())
798	<	c.forEach((x) -> { assertSame(x, elt); }); };
144	<	Runnable addRemove = () -> {
145	<	threadsStarted.countDown();
146	<	while (!done.get()) {
147	<	assertTrue(c.add(elt));
148	<	assertTrue(c.remove(elt));
149	<	}};
150	<	f1 = pool.submit(checkElt);
151	<	f2 = pool.submit(addRemove);
794	>	threadsStarted.bulkRegister(tasks.size());
795	>	futures = tasks.stream()
796	>	.map(pool::submit)
797	>	.collect(Collectors.toList());
798	>	threadsStarted.arriveAndDeregister();
799		Thread.sleep(testDurationMillis);
800		}
801	<	assertNull(f1.get(0L, MILLISECONDS));
802	<	assertNull(f2.get(0L, MILLISECONDS));
801	>	for (Future future : futures)
802	>	assertNull(future.get(0L, MILLISECONDS));
803	>	}
804	>
805	>	/**
806	>	* Spliterators are either IMMUTABLE or truly late-binding or, if
807	>	* concurrent, use the same "late-binding style" of returning
808	>	* elements added between creation and first use.
809	>	*/
810	>	public void testLateBindingStyle() {
811	>	if (!testImplementationDetails) return;
812	>	if (impl.klazz() == ArrayList.class) return; // for jdk8
813	>	// Immutable (snapshot) spliterators are exempt
814	>	if (impl.emptyCollection().spliterator()
815	>	.hasCharacteristics(Spliterator.IMMUTABLE))
816	>	return;
817	>	final Object one = impl.makeElement(1);
818	>	{
819	>	final Collection c = impl.emptyCollection();
820	>	final Spliterator split = c.spliterator();
821	>	c.add(one);
822	>	assertTrue(split.tryAdvance(e -> { assertSame(e, one); }));
823	>	assertFalse(split.tryAdvance(e -> { throw new AssertionError(); }));
824	>	assertTrue(c.contains(one));
825	>	}
826	>	{
827	>	final AtomicLong count = new AtomicLong(0);
828	>	final Collection c = impl.emptyCollection();
829	>	final Spliterator split = c.spliterator();
830	>	c.add(one);
831	>	split.forEachRemaining(
832	>	e -> { assertSame(e, one); count.getAndIncrement(); });
833	>	assertEquals(1L, count.get());
834	>	assertFalse(split.tryAdvance(e -> { throw new AssertionError(); }));
835	>	assertTrue(c.contains(one));
836	>	}
837	>	}
838	>
839	>	/**
840	>	* Spliterator.getComparator throws IllegalStateException iff the
841	>	* spliterator does not report SORTED.
842	>	*/
843	>	public void testGetComparator_IllegalStateException() {
844	>	Collection c = impl.emptyCollection();
845	>	Spliterator s = c.spliterator();
846	>	boolean reportsSorted = s.hasCharacteristics(Spliterator.SORTED);
847	>	try {
848	>	s.getComparator();
849	>	assertTrue(reportsSorted);
850	>	} catch (IllegalStateException ex) {
851	>	assertFalse(reportsSorted);
852	>	}
853		}
854
855	<	// public void testCollection8DebugFail() { fail(); }
855	>	//     public void testCollection8DebugFail() {
856	>	//         fail(impl.klazz().getSimpleName());
857	>	//     }
858		}

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