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

Comparing jsr166/src/test/tck/Collection8Test.java (file contents):
Revision 1.6 by jsr166, Sat Oct 29 22:47:55 2016 UTC vs.
Revision 1.30 by jsr166, Wed Nov 23 00:25:16 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.Deque;
#	Line 17 | Line 19 | import java.util.List;
19		import java.util.NoSuchElementException;
20		import java.util.Queue;
21		import java.util.Spliterator;
22	+	import java.util.concurrent.BlockingDeque;
23	+	import java.util.concurrent.BlockingQueue;
24		import java.util.concurrent.CountDownLatch;
25		import java.util.concurrent.Executors;
26		import java.util.concurrent.ExecutorService;
27		import java.util.concurrent.Future;
28	+	import java.util.concurrent.Phaser;
29		import java.util.concurrent.ThreadLocalRandom;
30		import java.util.concurrent.atomic.AtomicBoolean;
31		import java.util.concurrent.atomic.AtomicLong;
32		import java.util.concurrent.atomic.AtomicReference;
33		import java.util.function.Consumer;
34		import java.util.function.Predicate;
35	+	import java.util.stream.Collectors;
36
37		import junit.framework.Test;
38
#	Line 49 | Line 55 | public class Collection8Test extends JSR
55		impl);
56		}
57
58	+	Object bomb() {
59	+	return new Object() {
60	+	public boolean equals(Object x) { throw new AssertionError(); }
61	+	public int hashCode() { throw new AssertionError(); }
62	+	};
63	+	}
64	+
65		/** Checks properties of empty collections. */
66	<	public void testEmptyMeansEmpty() {
66	>	public void testEmptyMeansEmpty() throws Throwable {
67		Collection c = impl.emptyCollection();
68	+	emptyMeansEmpty(c);
69	+
70	+	if (c instanceof java.io.Serializable) {
71	+	try {
72	+	emptyMeansEmpty(serialClonePossiblyFailing(c));
73	+	} catch (java.io.NotSerializableException ex) {
74	+	// excusable when we have a serializable wrapper around
75	+	// a non-serializable collection, as can happen with:
76	+	// Vector.subList() => wrapped AbstractList$RandomAccessSubList
77	+	if (testImplementationDetails
78	+	&& (! c.getClass().getName().matches(
79	+	"java.util.Collections.*")))
80	+	throw ex;
81	+	}
82	+	}
83	+
84	+	Collection clone = cloneableClone(c);
85	+	if (clone != null)
86	+	emptyMeansEmpty(clone);
87	+	}
88	+
89	+	void emptyMeansEmpty(Collection c) throws InterruptedException {
90		assertTrue(c.isEmpty());
91		assertEquals(0, c.size());
92		assertEquals("[]", c.toString());
#	Line 76 | Line 111 | public class Collection8Test extends JSR
111		assertSame(3, a[2]);
112		}
113		assertIteratorExhausted(c.iterator());
114	<	Consumer alwaysThrows = (e) -> { throw new AssertionError(); };
114	>	Consumer alwaysThrows = e -> { throw new AssertionError(); };
115		c.forEach(alwaysThrows);
116		c.iterator().forEachRemaining(alwaysThrows);
117		c.spliterator().forEachRemaining(alwaysThrows);
118		assertFalse(c.spliterator().tryAdvance(alwaysThrows));
119	<	if (Queue.class.isAssignableFrom(impl.klazz())) {
119	>	if (c.spliterator().hasCharacteristics(Spliterator.SIZED))
120	>	assertEquals(0, c.spliterator().estimateSize());
121	>	assertFalse(c.contains(bomb()));
122	>	assertFalse(c.remove(bomb()));
123	>	if (c instanceof Queue) {
124		Queue q = (Queue) c;
125		assertNull(q.peek());
126		assertNull(q.poll());
127		}
128	<	if (Deque.class.isAssignableFrom(impl.klazz())) {
128	>	if (c instanceof Deque) {
129		Deque d = (Deque) c;
130		assertNull(d.peekFirst());
131		assertNull(d.peekLast());
132		assertNull(d.pollFirst());
133		assertNull(d.pollLast());
134		assertIteratorExhausted(d.descendingIterator());
135	+	d.descendingIterator().forEachRemaining(alwaysThrows);
136	+	assertFalse(d.removeFirstOccurrence(bomb()));
137	+	assertFalse(d.removeLastOccurrence(bomb()));
138	+	}
139	+	if (c instanceof BlockingQueue) {
140	+	BlockingQueue q = (BlockingQueue) c;
141	+	assertNull(q.poll(0L, MILLISECONDS));
142	+	}
143	+	if (c instanceof BlockingDeque) {
144	+	BlockingDeque q = (BlockingDeque) c;
145	+	assertNull(q.pollFirst(0L, MILLISECONDS));
146	+	assertNull(q.pollLast(0L, MILLISECONDS));
147		}
148		}
149
150	<	public void testNullPointerExceptions() {
150	>	public void testNullPointerExceptions() throws InterruptedException {
151		Collection c = impl.emptyCollection();
152		assertThrows(
153		NullPointerException.class,
#	Line 116 | Line 167 | public class Collection8Test extends JSR
167		NullPointerException.class,
168		() -> c.add(null));
169		}
170	<	if (!impl.permitsNulls()
120	<	&& Queue.class.isAssignableFrom(impl.klazz())) {
170	>	if (!impl.permitsNulls() && c instanceof Queue) {
171		Queue q = (Queue) c;
172		assertThrows(
173		NullPointerException.class,
174		() -> q.offer(null));
175		}
176	<	if (!impl.permitsNulls()
127	<	&& Deque.class.isAssignableFrom(impl.klazz())) {
176	>	if (!impl.permitsNulls() && c instanceof Deque) {
177		Deque d = (Deque) c;
178		assertThrows(
179		NullPointerException.class,
#	Line 135 | Line 184 | public class Collection8Test extends JSR
184		() -> d.push(null),
185		() -> d.descendingIterator().forEachRemaining(null));
186		}
187	+	if (c instanceof BlockingQueue) {
188	+	BlockingQueue q = (BlockingQueue) c;
189	+	assertThrows(
190	+	NullPointerException.class,
191	+	() -> {
192	+	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	+	}});
201	+	}
202	+	if (c instanceof BlockingDeque) {
203	+	BlockingDeque q = (BlockingDeque) c;
204	+	assertThrows(
205	+	NullPointerException.class,
206	+	() -> {
207	+	try { q.offerFirst(null, 1L, HOURS); }
208	+	catch (InterruptedException ex) {
209	+	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	+	}});
226	+	}
227		}
228
229		public void testNoSuchElementExceptions() {
#	Line 143 | Line 232 | public class Collection8Test extends JSR
232		NoSuchElementException.class,
233		() -> c.iterator().next());
234
235	<	if (Queue.class.isAssignableFrom(impl.klazz())) {
235	>	if (c instanceof Queue) {
236		Queue q = (Queue) c;
237		assertThrows(
238		NoSuchElementException.class,
239		() -> q.element(),
240		() -> q.remove());
241		}
242	<	if (Deque.class.isAssignableFrom(impl.klazz())) {
242	>	if (c instanceof Deque) {
243		Deque d = (Deque) c;
244		assertThrows(
245		NoSuchElementException.class,
#	Line 165 | Line 254 | public class Collection8Test extends JSR
254
255		public void testRemoveIf() {
256		Collection c = impl.emptyCollection();
257	+	boolean ordered =
258	+	c.spliterator().hasCharacteristics(Spliterator.ORDERED);
259		ThreadLocalRandom rnd = ThreadLocalRandom.current();
260		int n = rnd.nextInt(6);
261		for (int i = 0; i < n; i++) c.add(impl.makeElement(i));
262		AtomicReference threwAt = new AtomicReference(null);
263	<	ArrayList survivors = new ArrayList(c);
263	>	List orig = rnd.nextBoolean()
264	>	? new ArrayList(c)
265	>	: Arrays.asList(c.toArray());
266	>
267	>	// Merely creating an iterator can change ArrayBlockingQueue behavior
268	>	Iterator it = rnd.nextBoolean() ? c.iterator() : null;
269	>
270	>	ArrayList survivors = new ArrayList();
271		ArrayList accepts = new ArrayList();
272		ArrayList rejects = new ArrayList();
273	<	Predicate randomPredicate = (e) -> {
273	>
274	>	Predicate randomPredicate = e -> {
275		assertNull(threwAt.get());
276		switch (rnd.nextInt(3)) {
277		case 0: accepts.add(e); return true;
#	Line 182 | Line 281 | public class Collection8Test extends JSR
281		}
282		};
283		try {
284	<	boolean modified = c.removeIf(randomPredicate);
285	<	if (!modified) {
284	>	try {
285	>	boolean modified = c.removeIf(randomPredicate);
286		assertNull(threwAt.get());
287	<	assertEquals(n, rejects.size());
288	<	assertEquals(0, accepts.size());
287	>	assertEquals(modified, accepts.size() > 0);
288	>	assertEquals(modified, rejects.size() != n);
289	>	assertEquals(accepts.size() + rejects.size(), n);
290	>	if (ordered) {
291	>	assertEquals(rejects,
292	>	Arrays.asList(c.toArray()));
293	>	} else {
294	>	assertEquals(new HashSet(rejects),
295	>	new HashSet(Arrays.asList(c.toArray())));
296	>	}
297	>	} catch (ArithmeticException ok) {
298	>	assertNotNull(threwAt.get());
299	>	assertTrue(c.contains(threwAt.get()));
300	>	}
301	>	if (it != null && impl.isConcurrent())
302	>	// check for weakly consistent iterator
303	>	while (it.hasNext()) assertTrue(orig.contains(it.next()));
304	>	switch (rnd.nextInt(4)) {
305	>	case 0: survivors.addAll(c); break;
306	>	case 1: survivors.addAll(Arrays.asList(c.toArray())); break;
307	>	case 2: c.forEach(survivors::add); break;
308	>	case 3: for (Object e : c) survivors.add(e); break;
309	>	}
310	>	assertTrue(orig.containsAll(accepts));
311	>	assertTrue(orig.containsAll(rejects));
312	>	assertTrue(orig.containsAll(survivors));
313	>	assertTrue(orig.containsAll(c));
314	>	assertTrue(c.containsAll(rejects));
315	>	assertTrue(c.containsAll(survivors));
316	>	assertTrue(survivors.containsAll(rejects));
317	>	if (threwAt.get() == null) {
318	>	assertEquals(n - accepts.size(), c.size());
319	>	for (Object x : accepts) assertFalse(c.contains(x));
320	>	} else {
321	>	// Two acceptable behaviors: entire removeIf call is one
322	>	// transaction, or each element processed is one transaction.
323	>	assertTrue(n == c.size() || n == c.size() + accepts.size());
324	>	int k = 0;
325	>	for (Object x : accepts) if (c.contains(x)) k++;
326	>	assertTrue(k == accepts.size() || k == 0);
327		}
328	<	} catch (ArithmeticException ok) {}
192	<	survivors.removeAll(accepts);
193	<	if (n - accepts.size() != c.size()) {
328	>	} catch (Throwable ex) {
329		System.err.println(impl.klazz());
330	<	System.err.println(c);
331	<	System.err.println(accepts);
332	<	System.err.println(rejects);
333	<	System.err.println(survivors);
334	<	System.err.println(threwAt.get());
335	<	}
336	<	assertEquals(n - accepts.size(), c.size());
337	<	assertTrue(c.containsAll(survivors));
338	<	assertTrue(survivors.containsAll(rejects));
339	<	for (Object x : accepts) assertFalse(c.contains(x));
340	<	if (threwAt.get() == null)
206	<	assertEquals(accepts.size() + rejects.size(), n);
330	>	// c is at risk of corruption if we got here, so be lenient
331	>	try { System.err.printf("c=%s%n", c); }
332	>	catch (Throwable t) { t.printStackTrace(); }
333	>	System.err.printf("n=%d%n", n);
334	>	System.err.printf("orig=%s%n", orig);
335	>	System.err.printf("accepts=%s%n", accepts);
336	>	System.err.printf("rejects=%s%n", rejects);
337	>	System.err.printf("survivors=%s%n", survivors);
338	>	System.err.printf("threwAt=%s%n", threwAt.get());
339	>	throw ex;
340	>	}
341		}
342
343		/**
#	Line 216 | Line 350 | public class Collection8Test extends JSR
350		for (int i = 0; i < n; i++) c.add(impl.makeElement(i));
351		ArrayList iterated = new ArrayList();
352		ArrayList iteratedForEachRemaining = new ArrayList();
353	+	ArrayList tryAdvanced = new ArrayList();
354		ArrayList spliterated = new ArrayList();
355	<	ArrayList foreached = new ArrayList();
355	>	ArrayList forEached = new ArrayList();
356	>	ArrayList removeIfed = new ArrayList();
357		for (Object x : c) iterated.add(x);
358	<	c.iterator().forEachRemaining(e -> iteratedForEachRemaining.add(e));
359	<	c.spliterator().forEachRemaining(e -> spliterated.add(e));
360	<	c.forEach(e -> foreached.add(e));
358	>	c.iterator().forEachRemaining(iteratedForEachRemaining::add);
359	>	for (Spliterator s = c.spliterator();
360	>	s.tryAdvance(tryAdvanced::add); ) {}
361	>	c.spliterator().forEachRemaining(spliterated::add);
362	>	c.forEach(forEached::add);
363	>	c.removeIf(e -> { removeIfed.add(e); return false; });
364		boolean ordered =
365		c.spliterator().hasCharacteristics(Spliterator.ORDERED);
366		if (c instanceof List || c instanceof Deque)
367		assertTrue(ordered);
368		if (ordered) {
369		assertEquals(iterated, iteratedForEachRemaining);
370	+	assertEquals(iterated, tryAdvanced);
371		assertEquals(iterated, spliterated);
372	<	assertEquals(iterated, foreached);
372	>	assertEquals(iterated, forEached);
373	>	assertEquals(iterated, removeIfed);
374		} else {
375		HashSet cset = new HashSet(c);
376		assertEquals(cset, new HashSet(iterated));
377		assertEquals(cset, new HashSet(iteratedForEachRemaining));
378	+	assertEquals(cset, new HashSet(tryAdvanced));
379		assertEquals(cset, new HashSet(spliterated));
380	<	assertEquals(cset, new HashSet(foreached));
380	>	assertEquals(cset, new HashSet(forEached));
381	>	assertEquals(cset, new HashSet(removeIfed));
382		}
383		if (c instanceof Deque) {
384		Deque d = (Deque) c;
#	Line 254 | Line 397 | public class Collection8Test extends JSR
397
398		/**
399		* Calling Iterator#remove() after Iterator#forEachRemaining
400	<	* should remove last element
400	>	* should (maybe) remove last element
401		*/
402		public void testRemoveAfterForEachRemaining() {
403		Collection c = impl.emptyCollection();
404		ThreadLocalRandom rnd = ThreadLocalRandom.current();
405	<	{
405	>	testCollection: {
406		int n = 3 + rnd.nextInt(2);
407		for (int i = 0; i < n; i++) c.add(impl.makeElement(i));
408		Iterator it = c.iterator();
#	Line 267 | Line 410 | public class Collection8Test extends JSR
410		assertEquals(impl.makeElement(0), it.next());
411		assertTrue(it.hasNext());
412		assertEquals(impl.makeElement(1), it.next());
413	<	it.forEachRemaining((e) -> {});
414	<	it.remove();
415	<	assertEquals(n - 1, c.size());
416	<	for (int i = 0; i < n - 1; i++)
417	<	assertTrue(c.contains(impl.makeElement(i)));
418	<	assertFalse(c.contains(impl.makeElement(n - 1)));
413	>	it.forEachRemaining(e -> assertTrue(c.contains(e)));
414	>	if (testImplementationDetails) {
415	>	if (c instanceof java.util.concurrent.ArrayBlockingQueue) {
416	>	assertIteratorExhausted(it);
417	>	} else {
418	>	try { it.remove(); }
419	>	catch (UnsupportedOperationException ok) {
420	>	break testCollection;
421	>	}
422	>	assertEquals(n - 1, c.size());
423	>	for (int i = 0; i < n - 1; i++)
424	>	assertTrue(c.contains(impl.makeElement(i)));
425	>	assertFalse(c.contains(impl.makeElement(n - 1)));
426	>	}
427	>	}
428		}
429		if (c instanceof Deque) {
430		Deque d = (Deque) impl.emptyCollection();
#	Line 283 | Line 435 | public class Collection8Test extends JSR
435		assertEquals(impl.makeElement(n - 1), it.next());
436		assertTrue(it.hasNext());
437		assertEquals(impl.makeElement(n - 2), it.next());
438	<	it.forEachRemaining((e) -> {});
439	<	it.remove();
440	<	assertEquals(n - 1, d.size());
441	<	for (int i = 1; i < n; i++)
442	<	assertTrue(d.contains(impl.makeElement(i)));
443	<	assertFalse(d.contains(impl.makeElement(0)));
438	>	it.forEachRemaining(e -> assertTrue(c.contains(e)));
439	>	if (testImplementationDetails) {
440	>	it.remove();
441	>	assertEquals(n - 1, d.size());
442	>	for (int i = 1; i < n; i++)
443	>	assertTrue(d.contains(impl.makeElement(i)));
444	>	assertFalse(d.contains(impl.makeElement(0)));
445	>	}
446		}
447		}
448
#	Line 301 | Line 455 | public class Collection8Test extends JSR
455		final Object x = impl.makeElement(1);
456		final Object y = impl.makeElement(2);
457		final ArrayList found = new ArrayList();
458	<	Consumer<Object> spy = (o) -> { found.add(o); };
458	>	Consumer<Object> spy = o -> found.add(o);
459		c.stream().forEach(spy);
460		assertTrue(found.isEmpty());
461
#	Line 335 | Line 489 | public class Collection8Test extends JSR
489		Runnable checkElt = () -> {
490		threadsStarted.countDown();
491		while (!done.get())
492	<	c.stream().forEach((x) -> { assertSame(x, elt); }); };
492	>	c.stream().forEach(x -> assertSame(x, elt)); };
493		Runnable addRemove = () -> {
494		threadsStarted.countDown();
495		while (!done.get()) {
#	Line 359 | Line 513 | public class Collection8Test extends JSR
513		final Object x = impl.makeElement(1);
514		final Object y = impl.makeElement(2);
515		final ArrayList found = new ArrayList();
516	<	Consumer<Object> spy = (o) -> { found.add(o); };
516	>	Consumer<Object> spy = o -> found.add(o);
517		c.forEach(spy);
518		assertTrue(found.isEmpty());
519
#	Line 380 | Line 534 | public class Collection8Test extends JSR
534		assertTrue(found.isEmpty());
535		}
536
537	<	public void testForEachConcurrentStressTest() throws Throwable {
537	>	/**
538	>	* Motley crew of threads concurrently randomly hammer the collection.
539	>	*/
540	>	public void testDetectRaces() throws Throwable {
541		if (!impl.isConcurrent()) return;
542	+	final ThreadLocalRandom rnd = ThreadLocalRandom.current();
543		final Collection c = impl.emptyCollection();
544		final long testDurationMillis = timeoutMillis();
545		final AtomicBoolean done = new AtomicBoolean(false);
546	<	final Object elt = impl.makeElement(1);
547	<	final Future<?> f1, f2;
546	>	final Object one = impl.makeElement(1);
547	>	final Object two = impl.makeElement(2);
548	>	final Object[] emptyArray =
549	>	(Object[]) java.lang.reflect.Array.newInstance(one.getClass(), 0);
550	>	final List<Future<?>> futures;
551	>	final Phaser threadsStarted = new Phaser(1); // register this thread
552	>	final Runnable[] frobbers = {
553	>	() -> c.forEach(x -> assertTrue(x == one || x == two)),
554	>	() -> c.stream().forEach(x -> assertTrue(x == one || x == two)),
555	>	() -> c.spliterator().trySplit(),
556	>	() -> {
557	>	Spliterator s = c.spliterator();
558	>	s.tryAdvance(x -> assertTrue(x == one || x == two));
559	>	s.trySplit();
560	>	},
561	>	() -> {
562	>	Spliterator s = c.spliterator();
563	>	do {} while (s.tryAdvance(x -> assertTrue(x == one || x == two)));
564	>	},
565	>	() -> {
566	>	for (Object x : c) assertTrue(x == one || x == two);
567	>	},
568	>	() -> {
569	>	for (Object x : c.toArray()) assertTrue(x == one || x == two);
570	>	},
571	>	() -> {
572	>	for (Object x : c.toArray(emptyArray)) assertTrue(x == one || x == two);
573	>	},
574	>	() -> {
575	>	assertTrue(c.add(one));
576	>	assertTrue(c.contains(one));
577	>	assertTrue(c.remove(one));
578	>	assertFalse(c.contains(one));
579	>	},
580	>	() -> {
581	>	assertTrue(c.add(two));
582	>	assertTrue(c.contains(two));
583	>	assertTrue(c.remove(two));
584	>	assertFalse(c.contains(two));
585	>	},
586	>	};
587	>	final List<Runnable> tasks =
588	>	Arrays.stream(frobbers)
589	>	.filter(task -> rnd.nextBoolean()) // random subset
590	>	.map(task -> (Runnable) () -> {
591	>	threadsStarted.arriveAndAwaitAdvance();
592	>	while (!done.get())
593	>	task.run();
594	>	})
595	>	.collect(Collectors.toList());
596		final ExecutorService pool = Executors.newCachedThreadPool();
597		try (PoolCleaner cleaner = cleaner(pool, done)) {
598	<	final CountDownLatch threadsStarted = new CountDownLatch(2);
599	<	Runnable checkElt = () -> {
600	<	threadsStarted.countDown();
601	<	while (!done.get())
602	<	c.forEach((x) -> { assertSame(x, elt); }); };
397	<	Runnable addRemove = () -> {
398	<	threadsStarted.countDown();
399	<	while (!done.get()) {
400	<	assertTrue(c.add(elt));
401	<	assertTrue(c.remove(elt));
402	<	}};
403	<	f1 = pool.submit(checkElt);
404	<	f2 = pool.submit(addRemove);
598	>	threadsStarted.bulkRegister(tasks.size());
599	>	futures = tasks.stream()
600	>	.map(pool::submit)
601	>	.collect(Collectors.toList());
602	>	threadsStarted.arriveAndDeregister();
603		Thread.sleep(testDurationMillis);
604		}
605	<	assertNull(f1.get(0L, MILLISECONDS));
606	<	assertNull(f2.get(0L, MILLISECONDS));
605	>	for (Future future : futures)
606	>	assertNull(future.get(0L, MILLISECONDS));
607	>	}
608	>
609	>	/**
610	>	* Spliterators are either IMMUTABLE or truly late-binding or, if
611	>	* concurrent, use the same "late-binding style" of returning
612	>	* elements added between creation and first use.
613	>	*/
614	>	public void testLateBindingStyle() {
615	>	if (!testImplementationDetails) return;
616	>	// Immutable (snapshot) spliterators are exempt
617	>	if (impl.emptyCollection().spliterator()
618	>	.hasCharacteristics(Spliterator.IMMUTABLE))
619	>	return;
620	>	final Object one = impl.makeElement(1);
621	>	{
622	>	final Collection c = impl.emptyCollection();
623	>	final Spliterator split = c.spliterator();
624	>	c.add(one);
625	>	assertTrue(split.tryAdvance(e -> { assertSame(e, one); }));
626	>	assertFalse(split.tryAdvance(e -> { throw new AssertionError(); }));
627	>	assertTrue(c.contains(one));
628	>	}
629	>	{
630	>	final AtomicLong count = new AtomicLong(0);
631	>	final Collection c = impl.emptyCollection();
632	>	final Spliterator split = c.spliterator();
633	>	c.add(one);
634	>	split.forEachRemaining(
635	>	e -> { assertSame(e, one); count.getAndIncrement(); });
636	>	assertEquals(1L, count.get());
637	>	assertFalse(split.tryAdvance(e -> { throw new AssertionError(); }));
638	>	assertTrue(c.contains(one));
639	>	}
640		}
641
642		//     public void testCollection8DebugFail() {

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