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

Comparing jsr166/src/test/tck/LinkedTransferQueueTest.java (file contents):
Revision 1.10 by jsr166, Thu Aug 6 03:55:39 2009 UTC vs.
Revision 1.58 by jsr166, Sat Feb 28 19:59:23 2015 UTC

#	Line 1 | Line 1
1		/*
2		* Written by Doug Lea with assistance from members of JCP JSR-166
3		* Expert Group and released to the public domain, as explained at
4	<	* http://creativecommons.org/licenses/publicdomain
4	>	* http://creativecommons.org/publicdomain/zero/1.0/
5		* Other contributors include John Vint
6		*/
7
8	<	import java.io.BufferedInputStream;
9	<	import java.io.BufferedOutputStream;
10	<	import java.io.ByteArrayInputStream;
11	<	import java.io.ByteArrayOutputStream;
12	<	import java.io.ObjectInputStream;
13	<	import java.io.ObjectOutputStream;
8	>	import static java.util.concurrent.TimeUnit.MILLISECONDS;
9	>
10		import java.util.ArrayList;
11		import java.util.Arrays;
12	<	import java.util.ConcurrentModificationException;
12	>	import java.util.Collection;
13		import java.util.Iterator;
14	+	import java.util.List;
15		import java.util.NoSuchElementException;
16	<	import java.util.concurrent.*;
17	<	import static java.util.concurrent.TimeUnit.MILLISECONDS;
16	>	import java.util.Queue;
17	>	import java.util.concurrent.BlockingQueue;
18	>	import java.util.concurrent.CountDownLatch;
19	>	import java.util.concurrent.Executors;
20	>	import java.util.concurrent.ExecutorService;
21	>	import java.util.concurrent.LinkedTransferQueue;
22	>
23		import junit.framework.Test;
22	–	import junit.framework.TestSuite;
24
25		@SuppressWarnings({"unchecked", "rawtypes"})
26		public class LinkedTransferQueueTest extends JSR166TestCase {
27
28	+	public static class Generic extends BlockingQueueTest {
29	+	protected BlockingQueue emptyCollection() {
30	+	return new LinkedTransferQueue();
31	+	}
32	+	}
33	+
34		public static void main(String[] args) {
35		junit.textui.TestRunner.run(suite());
36		}
37
38		public static Test suite() {
39	<	return new TestSuite(LinkedTransferQueueTest.class);
39	>	return newTestSuite(LinkedTransferQueueTest.class,
40	>	new Generic().testSuite());
41		}
42
43		/**
#	Line 49 | Line 57 | public class LinkedTransferQueueTest ext
57		try {
58		new LinkedTransferQueue(null);
59		shouldThrow();
60	<	} catch (NullPointerException success) {
53	<	}
60	>	} catch (NullPointerException success) {}
61		}
62
63		/**
#	Line 58 | Line 65 | public class LinkedTransferQueueTest ext
65		* NullPointerException
66		*/
67		public void testConstructor3() {
68	+	Collection<Integer> elements = Arrays.asList(new Integer[SIZE]);
69		try {
70	<	Integer[] ints = new Integer[SIZE];
63	<	new LinkedTransferQueue(Arrays.asList(ints));
70	>	new LinkedTransferQueue(elements);
71		shouldThrow();
72	<	} catch (NullPointerException success) {
66	<	}
72	>	} catch (NullPointerException success) {}
73		}
74
75		/**
#	Line 71 | Line 77 | public class LinkedTransferQueueTest ext
77		* throws NullPointerException
78		*/
79		public void testConstructor4() {
80	+	Integer[] ints = new Integer[SIZE];
81	+	for (int i = 0; i < SIZE-1; ++i)
82	+	ints[i] = i;
83	+	Collection<Integer> elements = Arrays.asList(ints);
84		try {
85	<	Integer[] ints = new Integer[SIZE];
76	<	for (int i = 0; i < SIZE - 1; ++i) {
77	<	ints[i] = i;
78	<	}
79	<	new LinkedTransferQueue(Arrays.asList(ints));
85	>	new LinkedTransferQueue(elements);
86		shouldThrow();
87	<	} catch (NullPointerException success) {
82	<	}
87	>	} catch (NullPointerException success) {}
88		}
89
90		/**
91		* Queue contains all elements of the collection it is initialized by
92		*/
93		public void testConstructor5() {
94	<	try {
95	<	Integer[] ints = new Integer[SIZE];
96	<	for (int i = 0; i < SIZE; ++i) {
97	<	ints[i] = i;
98	<	}
99	<	LinkedTransferQueue q
100	<	= new LinkedTransferQueue(Arrays.asList(ints));
101	<	for (int i = 0; i < SIZE; ++i) {
102	<	assertEquals(ints[i], q.poll());
103	<	}
104	<	} finally {
94	>	Integer[] ints = new Integer[SIZE];
95	>	for (int i = 0; i < SIZE; ++i) {
96	>	ints[i] = i;
97	>	}
98	>	List intList = Arrays.asList(ints);
99	>	LinkedTransferQueue q
100	>	= new LinkedTransferQueue(intList);
101	>	assertEquals(q.size(), intList.size());
102	>	assertEquals(q.toString(), intList.toString());
103	>	assertTrue(Arrays.equals(q.toArray(),
104	>	intList.toArray()));
105	>	assertTrue(Arrays.equals(q.toArray(new Object[0]),
106	>	intList.toArray(new Object[0])));
107	>	assertTrue(Arrays.equals(q.toArray(new Object[SIZE]),
108	>	intList.toArray(new Object[SIZE])));
109	>	for (int i = 0; i < SIZE; ++i) {
110	>	assertEquals(ints[i], q.poll());
111		}
112		}
113
114		/**
115	<	* Remaining capacity never decrease nor increase on add or remove
115	>	* remainingCapacity() always returns Integer.MAX_VALUE
116		*/
117		public void testRemainingCapacity() {
118	<	LinkedTransferQueue<Integer> q = populatedQueue(SIZE);
118	>	BlockingQueue q = populatedQueue(SIZE);
119		for (int i = 0; i < SIZE; ++i) {
120		assertEquals(Integer.MAX_VALUE, q.remainingCapacity());
121		assertEquals(SIZE - i, q.size());
122	<	q.remove();
122	>	assertEquals(i, q.remove());
123		}
124		for (int i = 0; i < SIZE; ++i) {
125		assertEquals(Integer.MAX_VALUE, q.remainingCapacity());
126		assertEquals(i, q.size());
127	<	q.add(i);
117	<	}
118	<	}
119	<
120	<	/**
121	<	* offer(null) throws NullPointerException
122	<	*/
123	<	public void testOfferNull() {
124	<	try {
125	<	LinkedTransferQueue q = new LinkedTransferQueue();
126	<	q.offer(null);
127	<	shouldThrow();
128	<	} catch (NullPointerException success) {
129	<	}
130	<	}
131	<
132	<	/**
133	<	* add(null) throws NullPointerException
134	<	*/
135	<	public void testAddNull() {
136	<	try {
137	<	LinkedTransferQueue q = new LinkedTransferQueue();
138	<	q.add(null);
139	<	shouldThrow();
140	<	} catch (NullPointerException success) {
141	<	}
142	<	}
143	<
144	<	/**
145	<	* addAll(null) throws NullPointerException
146	<	*/
147	<	public void testAddAll1() {
148	<	try {
149	<	LinkedTransferQueue q = new LinkedTransferQueue();
150	<	q.addAll(null);
151	<	shouldThrow();
152	<	} catch (NullPointerException success) {
127	>	assertTrue(q.add(i));
128		}
129		}
130
#	Line 161 | Line 136 | public class LinkedTransferQueueTest ext
136		LinkedTransferQueue q = populatedQueue(SIZE);
137		q.addAll(q);
138		shouldThrow();
139	<	} catch (IllegalArgumentException success) {
165	<	}
166	<	}
167	<
168	<	/**
169	<	* addAll of a collection with null elements throws NullPointerException
170	<	*/
171	<	public void testAddAll2() {
172	<	try {
173	<	LinkedTransferQueue q = new LinkedTransferQueue();
174	<	Integer[] ints = new Integer[SIZE];
175	<	q.addAll(Arrays.asList(ints));
176	<	shouldThrow();
177	<	} catch (NullPointerException success) {
178	<	}
139	>	} catch (IllegalArgumentException success) {}
140		}
141
142		/**
#	Line 191 | Line 152 | public class LinkedTransferQueueTest ext
152		}
153		q.addAll(Arrays.asList(ints));
154		shouldThrow();
155	<	} catch (NullPointerException success) {
195	<	}
155	>	} catch (NullPointerException success) {}
156		}
157
158		/**
#	Line 213 | Line 173 | public class LinkedTransferQueueTest ext
173		}
174
175		/**
216	–	* put(null) throws NullPointerException
217	–	*/
218	–	public void testPutNull() throws InterruptedException {
219	–	try {
220	–	LinkedTransferQueue q = new LinkedTransferQueue();
221	–	q.put(null);
222	–	shouldThrow();
223	–	} catch (NullPointerException success) {}
224	–	}
225	–
226	–	/**
176		* all elements successfully put are contained
177		*/
178		public void testPut() {
179		LinkedTransferQueue<Integer> q = new LinkedTransferQueue<Integer>();
180		for (int i = 0; i < SIZE; ++i) {
181	+	assertEquals(i, q.size());
182		q.put(i);
183		assertTrue(q.contains(i));
184		}
235	–	assertEquals(q.size(), SIZE);
185		}
186
187		/**
#	Line 246 | Line 195 | public class LinkedTransferQueueTest ext
195		}
196
197		/**
198	<	* take blocks interruptibly when empty
250	<	*/
251	<	public void testTakeFromEmpty() throws InterruptedException {
252	<	final LinkedTransferQueue q = new LinkedTransferQueue();
253	<	Thread t = newStartedThread(new CheckedInterruptedRunnable() {
254	<	void realRun() throws InterruptedException {
255	<	q.take();
256	<	}});
257	<	Thread.sleep(SHORT_DELAY_MS);
258	<	t.interrupt();
259	<	t.join();
260	<	}
261	<
262	<	/**
263	<	* Take removes existing elements until empty, then blocks interruptibly
198	>	* take removes existing elements until empty, then blocks interruptibly
199		*/
200		public void testBlockingTake() throws InterruptedException {
201	<	Thread t = newStartedThread(new CheckedInterruptedRunnable() {
202	<	void realRun() throws InterruptedException {
203	<	LinkedTransferQueue<Integer> q = populatedQueue(SIZE);
201	>	final BlockingQueue q = populatedQueue(SIZE);
202	>	final CountDownLatch pleaseInterrupt = new CountDownLatch(1);
203	>	Thread t = newStartedThread(new CheckedRunnable() {
204	>	public void realRun() throws InterruptedException {
205		for (int i = 0; i < SIZE; ++i) {
206	<	threadAssertEquals(i, (int) q.take());
206	>	assertEquals(i, q.take());
207		}
208	<	q.take();
208	>
209	>	Thread.currentThread().interrupt();
210	>	try {
211	>	q.take();
212	>	shouldThrow();
213	>	} catch (InterruptedException success) {}
214	>	assertFalse(Thread.interrupted());
215	>
216	>	pleaseInterrupt.countDown();
217	>	try {
218	>	q.take();
219	>	shouldThrow();
220	>	} catch (InterruptedException success) {}
221	>	assertFalse(Thread.interrupted());
222		}});
223	<	Thread.sleep(SHORT_DELAY_MS);
223	>
224	>	await(pleaseInterrupt);
225	>	assertThreadStaysAlive(t);
226		t.interrupt();
227	<	t.join();
227	>	awaitTermination(t);
228		}
229
230		/**
231		* poll succeeds unless empty
232		*/
233	<	public void testPoll() {
233	>	public void testPoll() throws InterruptedException {
234		LinkedTransferQueue<Integer> q = populatedQueue(SIZE);
235		for (int i = 0; i < SIZE; ++i) {
236		assertEquals(i, (int) q.poll());
237		}
238		assertNull(q.poll());
239	+	checkEmpty(q);
240		}
241
242		/**
243	<	* timed pool with zero timeout succeeds when non-empty, else times out
243	>	* timed poll with zero timeout succeeds when non-empty, else times out
244		*/
245		public void testTimedPoll0() throws InterruptedException {
246		LinkedTransferQueue<Integer> q = populatedQueue(SIZE);
#	Line 296 | Line 248 | public class LinkedTransferQueueTest ext
248		assertEquals(i, (int) q.poll(0, MILLISECONDS));
249		}
250		assertNull(q.poll(0, MILLISECONDS));
251	+	checkEmpty(q);
252		}
253
254		/**
255	<	* timed pool with nonzero timeout succeeds when non-empty, else times out
255	>	* timed poll with nonzero timeout succeeds when non-empty, else times out
256		*/
257		public void testTimedPoll() throws InterruptedException {
258		LinkedTransferQueue<Integer> q = populatedQueue(SIZE);
259		for (int i = 0; i < SIZE; ++i) {
260	<	assertEquals(i, (int) q.poll(SHORT_DELAY_MS, MILLISECONDS));
261	<	}
262	<	assertNull(q.poll(SHORT_DELAY_MS, MILLISECONDS));
260	>	long startTime = System.nanoTime();
261	>	assertEquals(i, (int) q.poll(LONG_DELAY_MS, MILLISECONDS));
262	>	assertTrue(millisElapsedSince(startTime) < LONG_DELAY_MS);
263	>	}
264	>	long startTime = System.nanoTime();
265	>	assertNull(q.poll(timeoutMillis(), MILLISECONDS));
266	>	assertTrue(millisElapsedSince(startTime) >= timeoutMillis());
267	>	checkEmpty(q);
268		}
269
270		/**
#	Line 314 | Line 272 | public class LinkedTransferQueueTest ext
272		* returning timeout status
273		*/
274		public void testInterruptedTimedPoll() throws InterruptedException {
275	<	final LinkedTransferQueue<Integer> q = populatedQueue(SIZE);
276	<	Thread t = newStartedThread(new CheckedInterruptedRunnable() {
277	<	void realRun() throws InterruptedException {
275	>	final BlockingQueue<Integer> q = populatedQueue(SIZE);
276	>	final CountDownLatch aboutToWait = new CountDownLatch(1);
277	>	Thread t = newStartedThread(new CheckedRunnable() {
278	>	public void realRun() throws InterruptedException {
279		for (int i = 0; i < SIZE; ++i) {
280	<	threadAssertEquals(i, (int) q.poll(LONG_DELAY_MS,
281	<	MILLISECONDS));
280	>	long t0 = System.nanoTime();
281	>	assertEquals(i, (int) q.poll(LONG_DELAY_MS, MILLISECONDS));
282	>	assertTrue(millisElapsedSince(t0) < SMALL_DELAY_MS);
283	>	}
284	>	long t0 = System.nanoTime();
285	>	aboutToWait.countDown();
286	>	try {
287	>	q.poll(MEDIUM_DELAY_MS, MILLISECONDS);
288	>	shouldThrow();
289	>	} catch (InterruptedException success) {
290	>	assertTrue(millisElapsedSince(t0) < MEDIUM_DELAY_MS);
291		}
324	–	q.poll(LONG_DELAY_MS, MILLISECONDS);
292		}});
293	<	Thread.sleep(SMALL_DELAY_MS);
293	>
294	>	aboutToWait.await();
295	>	waitForThreadToEnterWaitState(t, SMALL_DELAY_MS);
296		t.interrupt();
297	<	t.join();
298	<	assertEquals(q.size(), 0);
330	<	assertNull(q.poll());
297	>	awaitTermination(t, MEDIUM_DELAY_MS);
298	>	checkEmpty(q);
299		}
300
301		/**
302	<	* timed poll before a delayed offer fails; after offer succeeds;
303	<	* on interruption throws
302	>	* timed poll after thread interrupted throws InterruptedException
303	>	* instead of returning timeout status
304		*/
305	<	public void testTimedPollWithOffer() throws InterruptedException {
306	<	final LinkedTransferQueue q = new LinkedTransferQueue();
307	<	Thread t = newStartedThread(new CheckedInterruptedRunnable() {
308	<	void realRun() throws InterruptedException {
309	<	threadAssertNull(q.poll(SHORT_DELAY_MS, MILLISECONDS));
310	<	q.poll(LONG_DELAY_MS, MILLISECONDS);
311	<	q.poll(LONG_DELAY_MS, MILLISECONDS);
305	>	public void testTimedPollAfterInterrupt() throws InterruptedException {
306	>	final BlockingQueue<Integer> q = populatedQueue(SIZE);
307	>	Thread t = newStartedThread(new CheckedRunnable() {
308	>	public void realRun() throws InterruptedException {
309	>	Thread.currentThread().interrupt();
310	>	for (int i = 0; i < SIZE; ++i) {
311	>	long t0 = System.nanoTime();
312	>	assertEquals(i, (int) q.poll(LONG_DELAY_MS, MILLISECONDS));
313	>	assertTrue(millisElapsedSince(t0) < SMALL_DELAY_MS);
314	>	}
315	>	try {
316	>	q.poll(MEDIUM_DELAY_MS, MILLISECONDS);
317	>	shouldThrow();
318	>	} catch (InterruptedException success) {}
319		}});
320	<	Thread.sleep(SMALL_DELAY_MS);
321	<	assertTrue(q.offer(zero, SHORT_DELAY_MS, MILLISECONDS));
322	<	t.interrupt();
348	<	t.join();
320	>
321	>	awaitTermination(t, MEDIUM_DELAY_MS);
322	>	checkEmpty(q);
323		}
324
325		/**
326		* peek returns next element, or null if empty
327		*/
328	<	public void testPeek() {
328	>	public void testPeek() throws InterruptedException {
329		LinkedTransferQueue<Integer> q = populatedQueue(SIZE);
330		for (int i = 0; i < SIZE; ++i) {
331		assertEquals(i, (int) q.peek());
#	Line 360 | Line 334 | public class LinkedTransferQueueTest ext
334		i != (int) q.peek());
335		}
336		assertNull(q.peek());
337	+	checkEmpty(q);
338		}
339
340		/**
341		* element returns next element, or throws NoSuchElementException if empty
342		*/
343	<	public void testElement() {
343	>	public void testElement() throws InterruptedException {
344		LinkedTransferQueue<Integer> q = populatedQueue(SIZE);
345		for (int i = 0; i < SIZE; ++i) {
346		assertEquals(i, (int) q.element());
#	Line 374 | Line 349 | public class LinkedTransferQueueTest ext
349		try {
350		q.element();
351		shouldThrow();
352	<	} catch (NoSuchElementException success) {
353	<	}
352	>	} catch (NoSuchElementException success) {}
353	>	checkEmpty(q);
354		}
355
356		/**
357		* remove removes next element, or throws NoSuchElementException if empty
358		*/
359	<	public void testRemove() {
359	>	public void testRemove() throws InterruptedException {
360		LinkedTransferQueue<Integer> q = populatedQueue(SIZE);
361		for (int i = 0; i < SIZE; ++i) {
362		assertEquals(i, (int) q.remove());
#	Line 389 | Line 364 | public class LinkedTransferQueueTest ext
364		try {
365		q.remove();
366		shouldThrow();
367	<	} catch (NoSuchElementException success) {
368	<	}
394	<	}
395	<
396	<	/**
397	<	* remove(x) removes x and returns true if present
398	<	*/
399	<	public void testRemoveElement() {
400	<	LinkedTransferQueue q = populatedQueue(SIZE);
401	<	for (int i = 1; i < SIZE; i += 2) {
402	<	assertTrue(q.remove(i));
403	<	}
404	<	for (int i = 0; i < SIZE; i += 2) {
405	<	assertTrue(q.remove(i));
406	<	assertFalse(q.remove(i + 1));
407	<	}
408	<	assertTrue(q.isEmpty());
367	>	} catch (NoSuchElementException success) {}
368	>	checkEmpty(q);
369		}
370
371		/**
#	Line 418 | Line 378 | public class LinkedTransferQueueTest ext
378		assertTrue(q.remove(one));
379		assertTrue(q.remove(two));
380		assertTrue(q.add(three));
381	<	assertTrue(q.take() != null);
381	>	assertSame(q.take(), three);
382		}
383
384		/**
#	Line 436 | Line 396 | public class LinkedTransferQueueTest ext
396		/**
397		* clear removes all elements
398		*/
399	<	public void testClear() {
399	>	public void testClear() throws InterruptedException {
400		LinkedTransferQueue q = populatedQueue(SIZE);
401		q.clear();
402	<	assertTrue(q.isEmpty());
443	<	assertEquals(0, q.size());
402	>	checkEmpty(q);
403		assertEquals(Integer.MAX_VALUE, q.remainingCapacity());
404		q.add(one);
405		assertFalse(q.isEmpty());
406	+	assertEquals(1, q.size());
407		assertTrue(q.contains(one));
408		q.clear();
409	<	assertTrue(q.isEmpty());
409	>	checkEmpty(q);
410		}
411
412		/**
#	Line 500 | Line 460 | public class LinkedTransferQueueTest ext
460		}
461
462		/**
463	<	* toArray contains all elements
463	>	* toArray() contains all elements in FIFO order
464		*/
465	<	public void testToArray() throws InterruptedException {
465	>	public void testToArray() {
466		LinkedTransferQueue q = populatedQueue(SIZE);
467		Object[] o = q.toArray();
468		for (int i = 0; i < o.length; i++) {
469	<	assertEquals(o[i], q.take());
469	>	assertSame(o[i], q.poll());
470		}
471		}
472
473		/**
474	<	* toArray(a) contains all elements
474	>	* toArray(a) contains all elements in FIFO order
475		*/
476	<	public void testToArray2() throws InterruptedException {
476	>	public void testToArray2() {
477		LinkedTransferQueue<Integer> q = populatedQueue(SIZE);
478		Integer[] ints = new Integer[SIZE];
479	<	ints = q.toArray(ints);
479	>	Integer[] array = q.toArray(ints);
480	>	assertSame(ints, array);
481		for (int i = 0; i < ints.length; i++) {
482	<	assertEquals(ints[i], q.take());
482	>	assertSame(ints[i], q.poll());
483		}
484		}
485
486		/**
487	<	* toArray(null) throws NullPointerException
527	<	*/
528	<	public void testToArray_BadArg() {
529	<	try {
530	<	LinkedTransferQueue q = populatedQueue(SIZE);
531	<	Object o[] = q.toArray(null);
532	<	shouldThrow();
533	<	} catch (NullPointerException success) {
534	<	}
535	<	}
536	<
537	<	/**
538	<	* toArray with incompatible array type throws CCE
487	>	* toArray(incompatible array type) throws ArrayStoreException
488		*/
489		public void testToArray1_BadArg() {
490	+	LinkedTransferQueue q = populatedQueue(SIZE);
491		try {
492	<	LinkedTransferQueue q = populatedQueue(SIZE);
543	<	Object o[] = q.toArray(new String[10]);
492	>	q.toArray(new String[10]);
493		shouldThrow();
494	<	} catch (ArrayStoreException success) {
546	<	}
494	>	} catch (ArrayStoreException success) {}
495		}
496
497		/**
#	Line 552 | Line 500 | public class LinkedTransferQueueTest ext
500		public void testIterator() throws InterruptedException {
501		LinkedTransferQueue q = populatedQueue(SIZE);
502		Iterator it = q.iterator();
503	<	int i = 0;
504	<	while (it.hasNext()) {
505	<	assertEquals(it.next(), i++);
558	<	}
503	>	int i;
504	>	for (i = 0; it.hasNext(); i++)
505	>	assertTrue(q.contains(it.next()));
506		assertEquals(i, SIZE);
507	+	assertIteratorExhausted(it);
508	+
509	+	it = q.iterator();
510	+	for (i = 0; it.hasNext(); i++)
511	+	assertEquals(it.next(), q.take());
512	+	assertEquals(i, SIZE);
513	+	assertIteratorExhausted(it);
514	+	}
515	+
516	+	/**
517	+	* iterator of empty collection has no elements
518	+	*/
519	+	public void testEmptyIterator() {
520	+	assertIteratorExhausted(new LinkedTransferQueue().iterator());
521		}
522
523		/**
524	<	* iterator.remove removes current element
524	>	* iterator.remove() removes current element
525		*/
526		public void testIteratorRemove() {
527		final LinkedTransferQueue q = new LinkedTransferQueue();
#	Line 573 | Line 534 | public class LinkedTransferQueueTest ext
534		it.remove();
535
536		it = q.iterator();
537	<	assertEquals(it.next(), one);
538	<	assertEquals(it.next(), three);
537	>	assertSame(it.next(), one);
538	>	assertSame(it.next(), three);
539		assertFalse(it.hasNext());
540		}
541
#	Line 618 | Line 579 | public class LinkedTransferQueueTest ext
579		LinkedTransferQueue q = populatedQueue(SIZE);
580		String s = q.toString();
581		for (int i = 0; i < SIZE; ++i) {
582	<	assertTrue(s.indexOf(String.valueOf(i)) >= 0);
582	>	assertTrue(s.contains(String.valueOf(i)));
583		}
584		}
585
#	Line 627 | Line 588 | public class LinkedTransferQueueTest ext
588		*/
589		public void testOfferInExecutor() {
590		final LinkedTransferQueue q = new LinkedTransferQueue();
591	<	q.add(one);
631	<	q.add(two);
591	>	final CheckedBarrier threadsStarted = new CheckedBarrier(2);
592		ExecutorService executor = Executors.newFixedThreadPool(2);
593
594		executor.execute(new CheckedRunnable() {
595	<	void realRun() {
596	<	threadAssertTrue(q.offer(three, MEDIUM_DELAY_MS,
597	<	MILLISECONDS));
595	>	public void realRun() throws InterruptedException {
596	>	threadsStarted.await();
597	>	assertTrue(q.offer(one, LONG_DELAY_MS, MILLISECONDS));
598		}});
599
600		executor.execute(new CheckedRunnable() {
601	<	void realRun() throws InterruptedException {
602	<	Thread.sleep(SMALL_DELAY_MS);
603	<	threadAssertEquals(one, q.take());
601	>	public void realRun() throws InterruptedException {
602	>	threadsStarted.await();
603	>	assertSame(one, q.take());
604	>	checkEmpty(q);
605		}});
606
607		joinPool(executor);
608		}
609
610		/**
611	<	* poll retrieves elements across Executor threads
611	>	* timed poll retrieves elements across Executor threads
612		*/
613		public void testPollInExecutor() {
614		final LinkedTransferQueue q = new LinkedTransferQueue();
615	+	final CheckedBarrier threadsStarted = new CheckedBarrier(2);
616		ExecutorService executor = Executors.newFixedThreadPool(2);
617
618		executor.execute(new CheckedRunnable() {
619	<	void realRun() throws InterruptedException {
620	<	threadAssertNull(q.poll());
621	<	threadAssertTrue(null != q.poll(MEDIUM_DELAY_MS,
622	<	MILLISECONDS));
623	<	threadAssertTrue(q.isEmpty());
619	>	public void realRun() throws InterruptedException {
620	>	assertNull(q.poll());
621	>	threadsStarted.await();
622	>	assertSame(one, q.poll(LONG_DELAY_MS, MILLISECONDS));
623	>	checkEmpty(q);
624		}});
625
626		executor.execute(new CheckedRunnable() {
627	<	void realRun() throws InterruptedException {
628	<	Thread.sleep(SMALL_DELAY_MS);
627	>	public void realRun() throws InterruptedException {
628	>	threadsStarted.await();
629		q.put(one);
630		}});
631
#	Line 674 | Line 636 | public class LinkedTransferQueueTest ext
636		* A deserialized serialized queue has same elements in same order
637		*/
638		public void testSerialization() throws Exception {
639	<	LinkedTransferQueue q = populatedQueue(SIZE);
640	<
679	<	ByteArrayOutputStream bout = new ByteArrayOutputStream(10000);
680	<	ObjectOutputStream out
681	<	= new ObjectOutputStream(new BufferedOutputStream(bout));
682	<	out.writeObject(q);
683	<	out.close();
684	<
685	<	ByteArrayInputStream bin
686	<	= new ByteArrayInputStream(bout.toByteArray());
687	<	ObjectInputStream in
688	<	= new ObjectInputStream(new BufferedInputStream(bin));
689	<	LinkedTransferQueue r = (LinkedTransferQueue) in.readObject();
690	<
691	<	assertEquals(q.size(), r.size());
692	<	while (!q.isEmpty()) {
693	<	assertEquals(q.remove(), r.remove());
694	<	}
695	<	}
639	>	Queue x = populatedQueue(SIZE);
640	>	Queue y = serialClone(x);
641
642	<	/**
643	<	* drainTo(null) throws NullPointerException
644	<	*/
645	<	public void testDrainToNull() {
646	<	LinkedTransferQueue q = populatedQueue(SIZE);
647	<	try {
648	<	q.drainTo(null);
704	<	shouldThrow();
705	<	} catch (NullPointerException success) {
706	<	}
707	<	}
708	<
709	<	/**
710	<	* drainTo(this) throws IllegalArgumentException
711	<	*/
712	<	public void testDrainToSelf() {
713	<	LinkedTransferQueue q = populatedQueue(SIZE);
714	<	try {
715	<	q.drainTo(q);
716	<	shouldThrow();
717	<	} catch (IllegalArgumentException success) {
642	>	assertNotSame(y, x);
643	>	assertEquals(x.size(), y.size());
644	>	assertEquals(x.toString(), y.toString());
645	>	assertTrue(Arrays.equals(x.toArray(), y.toArray()));
646	>	while (!x.isEmpty()) {
647	>	assertFalse(y.isEmpty());
648	>	assertEquals(x.remove(), y.remove());
649		}
650	+	assertTrue(y.isEmpty());
651		}
652
653		/**
#	Line 725 | Line 657 | public class LinkedTransferQueueTest ext
657		LinkedTransferQueue q = populatedQueue(SIZE);
658		ArrayList l = new ArrayList();
659		q.drainTo(l);
660	<	assertEquals(q.size(), 0);
661	<	assertEquals(l.size(), SIZE);
660	>	assertEquals(0, q.size());
661	>	assertEquals(SIZE, l.size());
662		for (int i = 0; i < SIZE; ++i) {
663	<	assertEquals(l.get(i), i);
663	>	assertEquals(i, l.get(i));
664		}
665		q.add(zero);
666		q.add(one);
#	Line 737 | Line 669 | public class LinkedTransferQueueTest ext
669		assertTrue(q.contains(one));
670		l.clear();
671		q.drainTo(l);
672	<	assertEquals(q.size(), 0);
673	<	assertEquals(l.size(), 2);
672	>	assertEquals(0, q.size());
673	>	assertEquals(2, l.size());
674		for (int i = 0; i < 2; ++i) {
675	<	assertEquals(l.get(i), i);
675	>	assertEquals(i, l.get(i));
676		}
677		}
678
679		/**
680	<	* drainTo empties full queue, unblocking a waiting put.
680	>	* drainTo(c) empties full queue, unblocking a waiting put.
681		*/
682		public void testDrainToWithActivePut() throws InterruptedException {
683		final LinkedTransferQueue q = populatedQueue(SIZE);
684		Thread t = newStartedThread(new CheckedRunnable() {
685	<	void realRun() {
685	>	public void realRun() {
686		q.put(SIZE + 1);
687		}});
688		ArrayList l = new ArrayList();
689		q.drainTo(l);
690		assertTrue(l.size() >= SIZE);
691	<	for (int i = 0; i < SIZE; ++i) {
692	<	assertEquals(l.get(i), i);
693	<	}
762	<	t.join();
691	>	for (int i = 0; i < SIZE; ++i)
692	>	assertEquals(i, l.get(i));
693	>	awaitTermination(t, MEDIUM_DELAY_MS);
694		assertTrue(q.size() + l.size() >= SIZE);
695		}
696
697		/**
698	<	* drainTo(null, n) throws NullPointerException
768	<	*/
769	<	public void testDrainToNullN() {
770	<	LinkedTransferQueue q = populatedQueue(SIZE);
771	<	try {
772	<	q.drainTo(null, 0);
773	<	shouldThrow();
774	<	} catch (NullPointerException success) {
775	<	}
776	<	}
777	<
778	<	/**
779	<	* drainTo(this, n) throws IllegalArgumentException
780	<	*/
781	<	public void testDrainToSelfN() {
782	<	LinkedTransferQueue q = populatedQueue(SIZE);
783	<	try {
784	<	q.drainTo(q, 0);
785	<	shouldThrow();
786	<	} catch (IllegalArgumentException success) {
787	<	}
788	<	}
789	<
790	<	/**
791	<	* drainTo(c, n) empties first max {n, size} elements of queue into c
698	>	* drainTo(c, n) empties first min(n, size) elements of queue into c
699		*/
700		public void testDrainToN() {
701		LinkedTransferQueue q = new LinkedTransferQueue();
#	Line 799 | Line 706 | public class LinkedTransferQueueTest ext
706		ArrayList l = new ArrayList();
707		q.drainTo(l, i);
708		int k = (i < SIZE) ? i : SIZE;
709	<	assertEquals(l.size(), k);
710	<	assertEquals(q.size(), SIZE - k);
711	<	for (int j = 0; j < k; ++j) {
712	<	assertEquals(l.get(j), j);
713	<	}
807	<	while (q.poll() != null)
808	<	;
709	>	assertEquals(k, l.size());
710	>	assertEquals(SIZE - k, q.size());
711	>	for (int j = 0; j < k; ++j)
712	>	assertEquals(j, l.get(j));
713	>	do {} while (q.poll() != null);
714		}
715		}
716
717		/**
718	<	* poll and take decrement the waiting consumer count
718	>	* timed poll() or take() increments the waiting consumer count;
719	>	* offer(e) decrements the waiting consumer count
720		*/
721		public void testWaitingConsumer() throws InterruptedException {
722		final LinkedTransferQueue q = new LinkedTransferQueue();
723	<	final ConsumerObserver waiting = new ConsumerObserver();
723	>	assertEquals(0, q.getWaitingConsumerCount());
724	>	assertFalse(q.hasWaitingConsumer());
725	>	final CountDownLatch threadStarted = new CountDownLatch(1);
726
727		Thread t = newStartedThread(new CheckedRunnable() {
728	<	void realRun() throws InterruptedException {
729	<	Thread.sleep(SMALL_DELAY_MS);
730	<	threadAssertTrue(q.hasWaitingConsumer());
731	<	waiting.setWaitingConsumer(q.getWaitingConsumerCount());
732	<	threadAssertTrue(q.offer(new Object()));
728	>	public void realRun() throws InterruptedException {
729	>	threadStarted.countDown();
730	>	assertSame(one, q.poll(LONG_DELAY_MS, MILLISECONDS));
731	>	assertEquals(0, q.getWaitingConsumerCount());
732	>	assertFalse(q.hasWaitingConsumer());
733		}});
734
735	<	assertTrue(q.poll(LONG_DELAY_MS, MILLISECONDS) != null);
736	<	assertTrue(q.getWaitingConsumerCount()
737	<	< waiting.getWaitingConsumers());
738	<	t.join();
735	>	threadStarted.await();
736	>	waitForThreadToEnterWaitState(t, SMALL_DELAY_MS);
737	>	assertEquals(1, q.getWaitingConsumerCount());
738	>	assertTrue(q.hasWaitingConsumer());
739	>
740	>	assertTrue(q.offer(one));
741	>	assertEquals(0, q.getWaitingConsumerCount());
742	>	assertFalse(q.hasWaitingConsumer());
743	>
744	>	awaitTermination(t, MEDIUM_DELAY_MS);
745		}
746
747		/**
#	Line 838 | Line 752 | public class LinkedTransferQueueTest ext
752		LinkedTransferQueue q = new LinkedTransferQueue();
753		q.transfer(null);
754		shouldThrow();
755	<	} catch (NullPointerException ex) {
842	<	}
755	>	} catch (NullPointerException success) {}
756		}
757
758		/**
#	Line 849 | Line 762 | public class LinkedTransferQueueTest ext
762		public void testTransfer2() throws InterruptedException {
763		final LinkedTransferQueue<Integer> q
764		= new LinkedTransferQueue<Integer>();
765	+	final CountDownLatch threadStarted = new CountDownLatch(1);
766
767		Thread t = newStartedThread(new CheckedRunnable() {
768	<	void realRun() throws InterruptedException {
769	<	q.transfer(SIZE);
770	<	threadAssertTrue(q.isEmpty());
768	>	public void realRun() throws InterruptedException {
769	>	threadStarted.countDown();
770	>	q.transfer(five);
771	>	checkEmpty(q);
772		}});
773
774	<	Thread.sleep(SHORT_DELAY_MS);
774	>	threadStarted.await();
775	>	waitForThreadToEnterWaitState(t, SMALL_DELAY_MS);
776		assertEquals(1, q.size());
777	<	assertEquals(SIZE, (int) q.poll());
778	<	assertTrue(q.isEmpty());
779	<	t.join();
777	>	assertSame(five, q.poll());
778	>	checkEmpty(q);
779	>	awaitTermination(t, MEDIUM_DELAY_MS);
780		}
781
782		/**
#	Line 871 | Line 787 | public class LinkedTransferQueueTest ext
787		= new LinkedTransferQueue<Integer>();
788
789		Thread first = newStartedThread(new CheckedRunnable() {
790	<	void realRun() throws InterruptedException {
791	<	Integer i = SIZE + 1;
792	<	q.transfer(i);
793	<	threadAssertTrue(!q.contains(i));
878	<	threadAssertEquals(1, q.size());
790	>	public void realRun() throws InterruptedException {
791	>	q.transfer(four);
792	>	assertTrue(!q.contains(four));
793	>	assertEquals(1, q.size());
794		}});
795
796		Thread interruptedThread = newStartedThread(
797		new CheckedInterruptedRunnable() {
798	<	void realRun() throws InterruptedException {
799	<	while (q.size() == 0)
798	>	public void realRun() throws InterruptedException {
799	>	while (q.isEmpty())
800		Thread.yield();
801	<	q.transfer(SIZE);
801	>	q.transfer(five);
802		}});
803
804		while (q.size() < 2)
805		Thread.yield();
806		assertEquals(2, q.size());
807	<	assertEquals(SIZE + 1, (int) q.poll());
807	>	assertSame(four, q.poll());
808		first.join();
809		assertEquals(1, q.size());
810		interruptedThread.interrupt();
811		interruptedThread.join();
812	<	assertEquals(0, q.size());
898	<	assertTrue(q.isEmpty());
812	>	checkEmpty(q);
813		}
814
815		/**
#	Line 906 | Line 820 | public class LinkedTransferQueueTest ext
820		final LinkedTransferQueue q = new LinkedTransferQueue();
821
822		Thread t = newStartedThread(new CheckedRunnable() {
823	<	void realRun() throws InterruptedException {
823	>	public void realRun() throws InterruptedException {
824		q.transfer(four);
825	<	threadAssertFalse(q.contains(four));
826	<	threadAssertEquals(three, q.poll());
825	>	assertFalse(q.contains(four));
826	>	assertSame(three, q.poll());
827		}});
828
829	<	Thread.sleep(SHORT_DELAY_MS);
829	>	while (q.isEmpty())
830	>	Thread.yield();
831	>	assertFalse(q.isEmpty());
832	>	assertEquals(1, q.size());
833		assertTrue(q.offer(three));
834	<	assertEquals(four, q.poll());
835	<	t.join();
834	>	assertSame(four, q.poll());
835	>	awaitTermination(t, MEDIUM_DELAY_MS);
836		}
837
838		/**
#	Line 927 | Line 844 | public class LinkedTransferQueueTest ext
844		= new LinkedTransferQueue<Integer>();
845
846		Thread t = newStartedThread(new CheckedRunnable() {
847	<	void realRun() throws InterruptedException {
848	<	q.transfer(SIZE);
849	<	threadAssertTrue(q.isEmpty());
847	>	public void realRun() throws InterruptedException {
848	>	q.transfer(four);
849	>	checkEmpty(q);
850		}});
851
852	<	Thread.sleep(SHORT_DELAY_MS);
853	<	assertEquals(SIZE, (int) q.take());
854	<	assertTrue(q.isEmpty());
855	<	t.join();
852	>	while (q.isEmpty())
853	>	Thread.yield();
854	>	assertFalse(q.isEmpty());
855	>	assertEquals(1, q.size());
856	>	assertSame(four, q.take());
857	>	checkEmpty(q);
858	>	awaitTermination(t, MEDIUM_DELAY_MS);
859		}
860
861		/**
#	Line 946 | Line 866 | public class LinkedTransferQueueTest ext
866		final LinkedTransferQueue q = new LinkedTransferQueue();
867		q.tryTransfer(null);
868		shouldThrow();
869	<	} catch (NullPointerException ex) {
950	<	}
869	>	} catch (NullPointerException success) {}
870		}
871
872		/**
873		* tryTransfer returns false and does not enqueue if there are no
874		* consumers waiting to poll or take.
875		*/
876	<	public void testTryTransfer2() {
876	>	public void testTryTransfer2() throws InterruptedException {
877		final LinkedTransferQueue q = new LinkedTransferQueue();
878		assertFalse(q.tryTransfer(new Object()));
879		assertFalse(q.hasWaitingConsumer());
880	<	assertTrue(q.isEmpty());
962	<	assertEquals(0, q.size());
880	>	checkEmpty(q);
881		}
882
883		/**
#	Line 971 | Line 889 | public class LinkedTransferQueueTest ext
889		final LinkedTransferQueue q = new LinkedTransferQueue();
890
891		Thread t = newStartedThread(new CheckedRunnable() {
892	<	void realRun() {
892	>	public void realRun() {
893		while (! q.hasWaitingConsumer())
894		Thread.yield();
895	<	threadAssertTrue(q.hasWaitingConsumer());
896	<	threadAssertTrue(q.isEmpty());
897	<	threadAssertTrue(q.size() == 0);
980	<	threadAssertTrue(q.tryTransfer(hotPotato));
895	>	assertTrue(q.hasWaitingConsumer());
896	>	checkEmpty(q);
897	>	assertTrue(q.tryTransfer(hotPotato));
898		}});
899
900	<	assertTrue(q.poll(MEDIUM_DELAY_MS, MILLISECONDS) == hotPotato);
901	<	assertTrue(q.isEmpty());
902	<	t.join();
900	>	assertSame(hotPotato, q.poll(MEDIUM_DELAY_MS, MILLISECONDS));
901	>	checkEmpty(q);
902	>	awaitTermination(t, MEDIUM_DELAY_MS);
903		}
904
905		/**
#	Line 994 | Line 911 | public class LinkedTransferQueueTest ext
911		final LinkedTransferQueue q = new LinkedTransferQueue();
912
913		Thread t = newStartedThread(new CheckedRunnable() {
914	<	void realRun() {
914	>	public void realRun() {
915		while (! q.hasWaitingConsumer())
916		Thread.yield();
917	<	threadAssertTrue(q.hasWaitingConsumer());
918	<	threadAssertTrue(q.isEmpty());
919	<	threadAssertTrue(q.size() == 0);
1003	<	threadAssertTrue(q.tryTransfer(hotPotato));
917	>	assertTrue(q.hasWaitingConsumer());
918	>	checkEmpty(q);
919	>	assertTrue(q.tryTransfer(hotPotato));
920		}});
921
922	<	assertTrue(q.take() == hotPotato);
923	<	assertTrue(q.isEmpty());
924	<	t.join();
922	>	assertSame(q.take(), hotPotato);
923	>	checkEmpty(q);
924	>	awaitTermination(t, MEDIUM_DELAY_MS);
925		}
926
927		/**
928	<	* tryTransfer waits the amount given if interrupted, and
1013	<	* throws interrupted exception
928	>	* tryTransfer blocks interruptibly if no takers
929		*/
930		public void testTryTransfer5() throws InterruptedException {
931		final LinkedTransferQueue q = new LinkedTransferQueue();
932	+	final CountDownLatch pleaseInterrupt = new CountDownLatch(1);
933	+	assertTrue(q.isEmpty());
934
935	<	Thread toInterrupt = newStartedThread(new CheckedInterruptedRunnable() {
936	<	void realRun() throws InterruptedException {
937	<	q.tryTransfer(new Object(), LONG_DELAY_MS, MILLISECONDS);
935	>	Thread t = newStartedThread(new CheckedRunnable() {
936	>	public void realRun() throws InterruptedException {
937	>	Thread.currentThread().interrupt();
938	>	try {
939	>	q.tryTransfer(new Object(), LONG_DELAY_MS, MILLISECONDS);
940	>	shouldThrow();
941	>	} catch (InterruptedException success) {}
942	>	assertFalse(Thread.interrupted());
943	>
944	>	pleaseInterrupt.countDown();
945	>	try {
946	>	q.tryTransfer(new Object(), LONG_DELAY_MS, MILLISECONDS);
947	>	shouldThrow();
948	>	} catch (InterruptedException success) {}
949	>	assertFalse(Thread.interrupted());
950		}});
951
952	<	Thread.sleep(SMALL_DELAY_MS);
953	<	toInterrupt.interrupt();
954	<	toInterrupt.join();
952	>	await(pleaseInterrupt);
953	>	assertThreadStaysAlive(t);
954	>	t.interrupt();
955	>	awaitTermination(t);
956	>	checkEmpty(q);
957		}
958
959		/**
960	<	* tryTransfer gives up after the timeout and return false
960	>	* tryTransfer gives up after the timeout and returns false
961		*/
962		public void testTryTransfer6() throws InterruptedException {
963		final LinkedTransferQueue q = new LinkedTransferQueue();
964
965		Thread t = newStartedThread(new CheckedRunnable() {
966	<	void realRun() throws InterruptedException {
967	<	threadAssertFalse
968	<	(q.tryTransfer(new Object(),
969	<	SHORT_DELAY_MS, MILLISECONDS));
966	>	public void realRun() throws InterruptedException {
967	>	long t0 = System.nanoTime();
968	>	assertFalse(q.tryTransfer(new Object(),
969	>	timeoutMillis(), MILLISECONDS));
970	>	assertTrue(millisElapsedSince(t0) >= timeoutMillis());
971	>	checkEmpty(q);
972		}});
973
974	<	Thread.sleep(SMALL_DELAY_MS);
975	<	assertTrue(q.isEmpty());
1043	<	t.join();
974	>	awaitTermination(t);
975	>	checkEmpty(q);
976		}
977
978		/**
#	Line 1052 | Line 984 | public class LinkedTransferQueueTest ext
984		assertTrue(q.offer(four));
985
986		Thread t = newStartedThread(new CheckedRunnable() {
987	<	void realRun() throws InterruptedException {
988	<	threadAssertTrue(q.tryTransfer(five,
989	<	MEDIUM_DELAY_MS, MILLISECONDS));
1058	<	threadAssertTrue(q.isEmpty());
987	>	public void realRun() throws InterruptedException {
988	>	assertTrue(q.tryTransfer(five, MEDIUM_DELAY_MS, MILLISECONDS));
989	>	checkEmpty(q);
990		}});
991
992	<	Thread.sleep(SHORT_DELAY_MS);
992	>	while (q.size() != 2)
993	>	Thread.yield();
994		assertEquals(2, q.size());
995	<	assertEquals(four, q.poll());
996	<	assertEquals(five, q.poll());
997	<	assertTrue(q.isEmpty());
998	<	t.join();
995	>	assertSame(four, q.poll());
996	>	assertSame(five, q.poll());
997	>	checkEmpty(q);
998	>	awaitTermination(t, MEDIUM_DELAY_MS);
999		}
1000
1001		/**
1002	<	* tryTransfer attempts to enqueue into the q and fails returning
1003	<	* false not enqueueing and the successive poll is null
1002	>	* tryTransfer attempts to enqueue into the queue and fails
1003	>	* returning false not enqueueing and the successive poll is null
1004		*/
1005		public void testTryTransfer8() throws InterruptedException {
1006		final LinkedTransferQueue q = new LinkedTransferQueue();
1007		assertTrue(q.offer(four));
1008		assertEquals(1, q.size());
1009	<	assertFalse(q.tryTransfer(five, SHORT_DELAY_MS, MILLISECONDS));
1009	>	long t0 = System.nanoTime();
1010	>	assertFalse(q.tryTransfer(five, timeoutMillis(), MILLISECONDS));
1011	>	assertTrue(millisElapsedSince(t0) >= timeoutMillis());
1012		assertEquals(1, q.size());
1013	<	assertEquals(four, q.poll());
1080	<	threadAssertTrue(q.isEmpty());
1013	>	assertSame(four, q.poll());
1014		assertNull(q.poll());
1015	+	checkEmpty(q);
1016		}
1017
1018		private LinkedTransferQueue<Integer> populatedQueue(int n) {
1019		LinkedTransferQueue<Integer> q = new LinkedTransferQueue<Integer>();
1020	<	assertTrue(q.isEmpty());
1020	>	checkEmpty(q);
1021		for (int i = 0; i < n; i++) {
1022		assertEquals(i, q.size());
1023		assertTrue(q.offer(i));
#	Line 1093 | Line 1027 | public class LinkedTransferQueueTest ext
1027		return q;
1028		}
1029
1030	<	private static class ConsumerObserver {
1031	<
1032	<	private int waitingConsumers;
1033	<
1034	<	private ConsumerObserver() {
1035	<	}
1036	<
1037	<	private void setWaitingConsumer(int i) {
1038	<	this.waitingConsumers = i;
1039	<	}
1040	<
1041	<	private int getWaitingConsumers() {
1108	<	return waitingConsumers;
1030	>	/**
1031	>	* remove(null), contains(null) always return false
1032	>	*/
1033	>	public void testNeverContainsNull() {
1034	>	Collection<?>[] qs = {
1035	>	new LinkedTransferQueue<Object>(),
1036	>	populatedQueue(2),
1037	>	};
1038	>
1039	>	for (Collection<?> q : qs) {
1040	>	assertFalse(q.contains(null));
1041	>	assertFalse(q.remove(null));
1042		}
1043		}
1044		}

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