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Comparing jsr166/src/test/tck/LinkedBlockingDequeTest.java (file contents):
Revision 1.34 by jsr166, Sun Nov 28 08:43:53 2010 UTC vs.
Revision 1.71 by jsr166, Sat May 13 21:52:59 2017 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		*/
6
7	–	import junit.framework.*;
8	–	import java.util.*;
9	–	import java.util.concurrent.*;
7		import static java.util.concurrent.TimeUnit.MILLISECONDS;
8	<	import java.io.*;
8	>
9	>	import java.util.ArrayList;
10	>	import java.util.Arrays;
11	>	import java.util.Collection;
12	>	import java.util.Deque;
13	>	import java.util.Iterator;
14	>	import java.util.NoSuchElementException;
15	>	import java.util.Queue;
16	>	import java.util.concurrent.BlockingDeque;
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.LinkedBlockingDeque;
22	>
23	>	import junit.framework.Test;
24
25		public class LinkedBlockingDequeTest extends JSR166TestCase {
26
#	Line 20 | Line 32 | public class LinkedBlockingDequeTest ext
32
33		public static class Bounded extends BlockingQueueTest {
34		protected BlockingQueue emptyCollection() {
35	<	return new LinkedBlockingDeque(20);
35	>	return new LinkedBlockingDeque(SIZE);
36		}
37		}
38
39		public static void main(String[] args) {
40	<	junit.textui.TestRunner.run(suite());
40	>	main(suite(), args);
41		}
42
43		public static Test suite() {
44	+	class Implementation implements CollectionImplementation {
45	+	public Class<?> klazz() { return LinkedBlockingDeque.class; }
46	+	public Collection emptyCollection() { return new LinkedBlockingDeque(); }
47	+	public Object makeElement(int i) { return i; }
48	+	public boolean isConcurrent() { return true; }
49	+	public boolean permitsNulls() { return false; }
50	+	}
51		return newTestSuite(LinkedBlockingDequeTest.class,
52		new Unbounded().testSuite(),
53	<	new Bounded().testSuite());
53	>	new Bounded().testSuite(),
54	>	CollectionTest.testSuite(new Implementation()));
55		}
56
57		/**
58	<	* Create a deque of given size containing consecutive
59	<	* Integers 0 ... n.
58	>	* Returns a new deque of given size containing consecutive
59	>	* Integers 0 ... n - 1.
60		*/
61	<	private LinkedBlockingDeque<Integer> populatedDeque(int n) {
61	>	private static LinkedBlockingDeque<Integer> populatedDeque(int n) {
62		LinkedBlockingDeque<Integer> q =
63		new LinkedBlockingDeque<Integer>(n);
64		assertTrue(q.isEmpty());
#	Line 47 | Line 67 | public class LinkedBlockingDequeTest ext
67		assertFalse(q.isEmpty());
68		assertEquals(0, q.remainingCapacity());
69		assertEquals(n, q.size());
70	+	assertEquals((Integer) 0, q.peekFirst());
71	+	assertEquals((Integer) (n - 1), q.peekLast());
72		return q;
73		}
74
#	Line 70 | Line 92 | public class LinkedBlockingDequeTest ext
92		public void testSize() {
93		LinkedBlockingDeque q = populatedDeque(SIZE);
94		for (int i = 0; i < SIZE; ++i) {
95	<	assertEquals(SIZE-i, q.size());
95	>	assertEquals(SIZE - i, q.size());
96		q.removeFirst();
97		}
98		for (int i = 0; i < SIZE; ++i) {
#	Line 80 | Line 102 | public class LinkedBlockingDequeTest ext
102		}
103
104		/**
105	<	* offer(null) throws NPE
105	>	* offerFirst(null) throws NullPointerException
106		*/
107		public void testOfferFirstNull() {
108	+	LinkedBlockingDeque q = new LinkedBlockingDeque();
109		try {
87	–	LinkedBlockingDeque q = new LinkedBlockingDeque();
110		q.offerFirst(null);
111		shouldThrow();
112		} catch (NullPointerException success) {}
113		}
114
115		/**
116	+	* offerLast(null) throws NullPointerException
117	+	*/
118	+	public void testOfferLastNull() {
119	+	LinkedBlockingDeque q = new LinkedBlockingDeque();
120	+	try {
121	+	q.offerLast(null);
122	+	shouldThrow();
123	+	} catch (NullPointerException success) {}
124	+	}
125	+
126	+	/**
127		* OfferFirst succeeds
128		*/
129		public void testOfferFirst() {
#	Line 124 | Line 157 | public class LinkedBlockingDequeTest ext
157		*/
158		public void testPollLast() {
159		LinkedBlockingDeque q = populatedDeque(SIZE);
160	<	for (int i = SIZE-1; i >= 0; --i) {
160	>	for (int i = SIZE - 1; i >= 0; --i) {
161		assertEquals(i, q.pollLast());
162		}
163		assertNull(q.pollLast());
#	Line 163 | Line 196 | public class LinkedBlockingDequeTest ext
196		*/
197		public void testPeekLast() {
198		LinkedBlockingDeque q = populatedDeque(SIZE);
199	<	for (int i = SIZE-1; i >= 0; --i) {
199	>	for (int i = SIZE - 1; i >= 0; --i) {
200		assertEquals(i, q.peekLast());
201		assertEquals(i, q.pollLast());
202		assertTrue(q.peekLast() == null ||
#	Line 193 | Line 226 | public class LinkedBlockingDequeTest ext
226		*/
227		public void testLastElement() {
228		LinkedBlockingDeque q = populatedDeque(SIZE);
229	<	for (int i = SIZE-1; i >= 0; --i) {
229	>	for (int i = SIZE - 1; i >= 0; --i) {
230		assertEquals(i, q.getLast());
231		assertEquals(i, q.pollLast());
232		}
#	Line 253 | Line 286 | public class LinkedBlockingDequeTest ext
286		*/
287		public void testRemoveFirstOccurrence() {
288		LinkedBlockingDeque q = populatedDeque(SIZE);
289	<	for (int i = 1; i < SIZE; i+=2) {
289	>	for (int i = 1; i < SIZE; i += 2) {
290		assertTrue(q.removeFirstOccurrence(new Integer(i)));
291		}
292	<	for (int i = 0; i < SIZE; i+=2) {
292	>	for (int i = 0; i < SIZE; i += 2) {
293		assertTrue(q.removeFirstOccurrence(new Integer(i)));
294	<	assertFalse(q.removeFirstOccurrence(new Integer(i+1)));
294	>	assertFalse(q.removeFirstOccurrence(new Integer(i + 1)));
295		}
296		assertTrue(q.isEmpty());
297		}
#	Line 268 | Line 301 | public class LinkedBlockingDequeTest ext
301		*/
302		public void testRemoveLastOccurrence() {
303		LinkedBlockingDeque q = populatedDeque(SIZE);
304	<	for (int i = 1; i < SIZE; i+=2) {
304	>	for (int i = 1; i < SIZE; i += 2) {
305		assertTrue(q.removeLastOccurrence(new Integer(i)));
306		}
307	<	for (int i = 0; i < SIZE; i+=2) {
307	>	for (int i = 0; i < SIZE; i += 2) {
308		assertTrue(q.removeLastOccurrence(new Integer(i)));
309	<	assertFalse(q.removeLastOccurrence(new Integer(i+1)));
309	>	assertFalse(q.removeLastOccurrence(new Integer(i + 1)));
310		}
311		assertTrue(q.isEmpty());
312		}
#	Line 298 | Line 331 | public class LinkedBlockingDequeTest ext
331		assertSame(four, q.peekLast());
332		}
333
301	–
334		/**
335		* A new deque has the indicated capacity, or Integer.MAX_VALUE if
336		* none given
#	Line 309 | Line 341 | public class LinkedBlockingDequeTest ext
341		}
342
343		/**
344	<	* Constructor throws IAE if capacity argument nonpositive
344	>	* Constructor throws IllegalArgumentException if capacity argument nonpositive
345		*/
346		public void testConstructor2() {
347		try {
348	<	LinkedBlockingDeque q = new LinkedBlockingDeque(0);
348	>	new LinkedBlockingDeque(0);
349		shouldThrow();
350		} catch (IllegalArgumentException success) {}
351		}
352
353		/**
354	<	* Initializing from null Collection throws NPE
354	>	* Initializing from null Collection throws NullPointerException
355		*/
356		public void testConstructor3() {
357		try {
358	<	LinkedBlockingDeque q = new LinkedBlockingDeque(null);
358	>	new LinkedBlockingDeque(null);
359		shouldThrow();
360		} catch (NullPointerException success) {}
361		}
362
363		/**
364	<	* Initializing from Collection of null elements throws NPE
364	>	* Initializing from Collection of null elements throws NullPointerException
365		*/
366		public void testConstructor4() {
367	+	Collection<Integer> elements = Arrays.asList(new Integer[SIZE]);
368		try {
369	<	Integer[] ints = new Integer[SIZE];
337	<	LinkedBlockingDeque q = new LinkedBlockingDeque(Arrays.asList(ints));
369	>	new LinkedBlockingDeque(elements);
370		shouldThrow();
371		} catch (NullPointerException success) {}
372		}
373
374		/**
375	<	* Initializing from Collection with some null elements throws NPE
375	>	* Initializing from Collection with some null elements throws
376	>	* NullPointerException
377		*/
378		public void testConstructor5() {
379	+	Integer[] ints = new Integer[SIZE];
380	+	for (int i = 0; i < SIZE - 1; ++i)
381	+	ints[i] = i;
382	+	Collection<Integer> elements = Arrays.asList(ints);
383		try {
384	<	Integer[] ints = new Integer[SIZE];
348	<	for (int i = 0; i < SIZE-1; ++i)
349	<	ints[i] = new Integer(i);
350	<	LinkedBlockingDeque q = new LinkedBlockingDeque(Arrays.asList(ints));
384	>	new LinkedBlockingDeque(elements);
385		shouldThrow();
386		} catch (NullPointerException success) {}
387		}
#	Line 358 | Line 392 | public class LinkedBlockingDequeTest ext
392		public void testConstructor6() {
393		Integer[] ints = new Integer[SIZE];
394		for (int i = 0; i < SIZE; ++i)
395	<	ints[i] = new Integer(i);
395	>	ints[i] = i;
396		LinkedBlockingDeque q = new LinkedBlockingDeque(Arrays.asList(ints));
397		for (int i = 0; i < SIZE; ++i)
398		assertEquals(ints[i], q.poll());
#	Line 383 | Line 417 | public class LinkedBlockingDequeTest ext
417		* remainingCapacity decreases on add, increases on remove
418		*/
419		public void testRemainingCapacity() {
420	<	LinkedBlockingDeque q = populatedDeque(SIZE);
420	>	BlockingQueue q = populatedDeque(SIZE);
421		for (int i = 0; i < SIZE; ++i) {
422		assertEquals(i, q.remainingCapacity());
423	<	assertEquals(SIZE-i, q.size());
424	<	q.remove();
423	>	assertEquals(SIZE, q.size() + q.remainingCapacity());
424	>	assertEquals(i, q.remove());
425		}
426		for (int i = 0; i < SIZE; ++i) {
427	<	assertEquals(SIZE-i, q.remainingCapacity());
428	<	assertEquals(i, q.size());
429	<	q.add(new Integer(i));
427	>	assertEquals(SIZE - i, q.remainingCapacity());
428	>	assertEquals(SIZE, q.size() + q.remainingCapacity());
429	>	assertTrue(q.add(i));
430		}
431		}
432
433		/**
400	–	* offer(null) throws NPE
401	–	*/
402	–	public void testOfferNull() {
403	–	try {
404	–	LinkedBlockingDeque q = new LinkedBlockingDeque(1);
405	–	q.offer(null);
406	–	shouldThrow();
407	–	} catch (NullPointerException success) {}
408	–	}
409	–
410	–	/**
411	–	* add(null) throws NPE
412	–	*/
413	–	public void testAddNull() {
414	–	try {
415	–	LinkedBlockingDeque q = new LinkedBlockingDeque(1);
416	–	q.add(null);
417	–	shouldThrow();
418	–	} catch (NullPointerException success) {}
419	–	}
420	–
421	–	/**
434		* push(null) throws NPE
435		*/
436		public void testPushNull() {
437	+	LinkedBlockingDeque q = new LinkedBlockingDeque(1);
438		try {
426	–	LinkedBlockingDeque q = new LinkedBlockingDeque(1);
439		q.push(null);
440		shouldThrow();
441		} catch (NullPointerException success) {}
#	Line 433 | Line 445 | public class LinkedBlockingDequeTest ext
445		* push succeeds if not full; throws ISE if full
446		*/
447		public void testPush() {
448	+	LinkedBlockingDeque q = new LinkedBlockingDeque(SIZE);
449	+	for (int i = 0; i < SIZE; ++i) {
450	+	Integer x = new Integer(i);
451	+	q.push(x);
452	+	assertEquals(x, q.peek());
453	+	}
454	+	assertEquals(0, q.remainingCapacity());
455		try {
437	–	LinkedBlockingDeque q = new LinkedBlockingDeque(SIZE);
438	–	for (int i = 0; i < SIZE; ++i) {
439	–	Integer I = new Integer(i);
440	–	q.push(I);
441	–	assertEquals(I, q.peek());
442	–	}
443	–	assertEquals(0, q.remainingCapacity());
456		q.push(new Integer(SIZE));
457		shouldThrow();
458		} catch (IllegalStateException success) {}
#	Line 456 | Line 468 | public class LinkedBlockingDequeTest ext
468		assertSame(four, q.peekFirst());
469		}
470
459	–
471		/**
472		* pop removes next element, or throws NSEE if empty
473		*/
#	Line 471 | Line 482 | public class LinkedBlockingDequeTest ext
482		} catch (NoSuchElementException success) {}
483		}
484
474	–
485		/**
486		* Offer succeeds if not full; fails if full
487		*/
#	Line 485 | Line 495 | public class LinkedBlockingDequeTest ext
495		* add succeeds if not full; throws ISE if full
496		*/
497		public void testAdd() {
498	+	LinkedBlockingDeque q = new LinkedBlockingDeque(SIZE);
499	+	for (int i = 0; i < SIZE; ++i)
500	+	assertTrue(q.add(new Integer(i)));
501	+	assertEquals(0, q.remainingCapacity());
502		try {
489	–	LinkedBlockingDeque q = new LinkedBlockingDeque(SIZE);
490	–	for (int i = 0; i < SIZE; ++i) {
491	–	assertTrue(q.add(new Integer(i)));
492	–	}
493	–	assertEquals(0, q.remainingCapacity());
503		q.add(new Integer(SIZE));
504		shouldThrow();
505		} catch (IllegalStateException success) {}
506		}
507
508		/**
500	–	* addAll(null) throws NPE
501	–	*/
502	–	public void testAddAll1() {
503	–	try {
504	–	LinkedBlockingDeque q = new LinkedBlockingDeque(1);
505	–	q.addAll(null);
506	–	shouldThrow();
507	–	} catch (NullPointerException success) {}
508	–	}
509	–
510	–	/**
509		* addAll(this) throws IAE
510		*/
511		public void testAddAllSelf() {
512	+	LinkedBlockingDeque q = populatedDeque(SIZE);
513		try {
515	–	LinkedBlockingDeque q = populatedDeque(SIZE);
514		q.addAll(q);
515		shouldThrow();
516		} catch (IllegalArgumentException success) {}
517		}
518
519		/**
522	–	* addAll of a collection with null elements throws NPE
523	–	*/
524	–	public void testAddAll2() {
525	–	try {
526	–	LinkedBlockingDeque q = new LinkedBlockingDeque(SIZE);
527	–	Integer[] ints = new Integer[SIZE];
528	–	q.addAll(Arrays.asList(ints));
529	–	shouldThrow();
530	–	} catch (NullPointerException success) {}
531	–	}
532	–
533	–	/**
520		* addAll of a collection with any null elements throws NPE after
521		* possibly adding some elements
522		*/
523		public void testAddAll3() {
524	+	LinkedBlockingDeque q = new LinkedBlockingDeque(SIZE);
525	+	Integer[] ints = new Integer[SIZE];
526	+	for (int i = 0; i < SIZE - 1; ++i)
527	+	ints[i] = new Integer(i);
528	+	Collection<Integer> elements = Arrays.asList(ints);
529		try {
530	<	LinkedBlockingDeque q = new LinkedBlockingDeque(SIZE);
540	<	Integer[] ints = new Integer[SIZE];
541	<	for (int i = 0; i < SIZE-1; ++i)
542	<	ints[i] = new Integer(i);
543	<	q.addAll(Arrays.asList(ints));
530	>	q.addAll(elements);
531		shouldThrow();
532		} catch (NullPointerException success) {}
533		}
534
535		/**
536	<	* addAll throws ISE if not enough room
536	>	* addAll throws IllegalStateException if not enough room
537		*/
538		public void testAddAll4() {
539	+	LinkedBlockingDeque q = new LinkedBlockingDeque(SIZE - 1);
540	+	Integer[] ints = new Integer[SIZE];
541	+	for (int i = 0; i < SIZE; ++i)
542	+	ints[i] = new Integer(i);
543	+	Collection<Integer> elements = Arrays.asList(ints);
544		try {
545	<	LinkedBlockingDeque q = new LinkedBlockingDeque(1);
554	<	Integer[] ints = new Integer[SIZE];
555	<	for (int i = 0; i < SIZE; ++i)
556	<	ints[i] = new Integer(i);
557	<	q.addAll(Arrays.asList(ints));
545	>	q.addAll(elements);
546		shouldThrow();
547		} catch (IllegalStateException success) {}
548		}
#	Line 574 | Line 562 | public class LinkedBlockingDequeTest ext
562		assertEquals(ints[i], q.poll());
563		}
564
577	–
578	–	/**
579	–	* put(null) throws NPE
580	–	*/
581	–	public void testPutNull() throws InterruptedException {
582	–	try {
583	–	LinkedBlockingDeque q = new LinkedBlockingDeque(SIZE);
584	–	q.put(null);
585	–	shouldThrow();
586	–	} catch (NullPointerException success) {}
587	–	}
588	–
565		/**
566		* all elements successfully put are contained
567		*/
568		public void testPut() throws InterruptedException {
569		LinkedBlockingDeque q = new LinkedBlockingDeque(SIZE);
570		for (int i = 0; i < SIZE; ++i) {
571	<	Integer I = new Integer(i);
572	<	q.put(I);
573	<	assertTrue(q.contains(I));
571	>	Integer x = new Integer(i);
572	>	q.put(x);
573	>	assertTrue(q.contains(x));
574		}
575		assertEquals(0, q.remainingCapacity());
576		}
#	Line 604 | Line 580 | public class LinkedBlockingDequeTest ext
580		*/
581		public void testBlockingPut() throws InterruptedException {
582		final LinkedBlockingDeque q = new LinkedBlockingDeque(SIZE);
583	<	Thread t = new Thread(new CheckedRunnable() {
583	>	final CountDownLatch pleaseInterrupt = new CountDownLatch(1);
584	>	Thread t = newStartedThread(new CheckedRunnable() {
585		public void realRun() throws InterruptedException {
586		for (int i = 0; i < SIZE; ++i)
587		q.put(i);
588		assertEquals(SIZE, q.size());
589		assertEquals(0, q.remainingCapacity());
590	+
591	+	Thread.currentThread().interrupt();
592	+	try {
593	+	q.put(99);
594	+	shouldThrow();
595	+	} catch (InterruptedException success) {}
596	+	assertFalse(Thread.interrupted());
597	+
598	+	pleaseInterrupt.countDown();
599		try {
600		q.put(99);
601		shouldThrow();
602		} catch (InterruptedException success) {}
603	+	assertFalse(Thread.interrupted());
604		}});
605
606	<	t.start();
607	<	Thread.sleep(SHORT_DELAY_MS);
606	>	await(pleaseInterrupt);
607	>	assertThreadStaysAlive(t);
608		t.interrupt();
609	<	t.join();
609	>	awaitTermination(t);
610		assertEquals(SIZE, q.size());
611		assertEquals(0, q.remainingCapacity());
612		}
613
614		/**
615	<	* put blocks waiting for take when full
615	>	* put blocks interruptibly waiting for take when full
616		*/
617		public void testPutWithTake() throws InterruptedException {
618		final int capacity = 2;
619		final LinkedBlockingDeque q = new LinkedBlockingDeque(capacity);
620	<	Thread t = new Thread(new CheckedRunnable() {
620	>	final CountDownLatch pleaseTake = new CountDownLatch(1);
621	>	final CountDownLatch pleaseInterrupt = new CountDownLatch(1);
622	>	Thread t = newStartedThread(new CheckedRunnable() {
623		public void realRun() throws InterruptedException {
624	<	for (int i = 0; i < capacity + 1; i++)
624	>	for (int i = 0; i < capacity; i++)
625		q.put(i);
626	+	pleaseTake.countDown();
627	+	q.put(86);
628	+
629	+	pleaseInterrupt.countDown();
630		try {
631		q.put(99);
632		shouldThrow();
633		} catch (InterruptedException success) {}
634	+	assertFalse(Thread.interrupted());
635		}});
636
637	<	t.start();
638	<	Thread.sleep(SHORT_DELAY_MS);
645	<	assertEquals(q.remainingCapacity(), 0);
637	>	await(pleaseTake);
638	>	assertEquals(0, q.remainingCapacity());
639		assertEquals(0, q.take());
640	<	Thread.sleep(SHORT_DELAY_MS);
640	>
641	>	await(pleaseInterrupt);
642	>	assertThreadBlocks(t, Thread.State.WAITING);
643		t.interrupt();
644	<	t.join();
645	<	assertEquals(q.remainingCapacity(), 0);
644	>	awaitTermination(t);
645	>	assertEquals(0, q.remainingCapacity());
646		}
647
648		/**
#	Line 655 | Line 650 | public class LinkedBlockingDequeTest ext
650		*/
651		public void testTimedOffer() throws InterruptedException {
652		final LinkedBlockingDeque q = new LinkedBlockingDeque(2);
653	<	Thread t = new Thread(new CheckedRunnable() {
653	>	final CountDownLatch pleaseInterrupt = new CountDownLatch(1);
654	>	Thread t = newStartedThread(new CheckedRunnable() {
655		public void realRun() throws InterruptedException {
656		q.put(new Object());
657		q.put(new Object());
658	<	assertFalse(q.offer(new Object(), SHORT_DELAY_MS, MILLISECONDS));
658	>	long startTime = System.nanoTime();
659	>	assertFalse(q.offer(new Object(), timeoutMillis(), MILLISECONDS));
660	>	assertTrue(millisElapsedSince(startTime) >= timeoutMillis());
661	>	pleaseInterrupt.countDown();
662		try {
663	<	q.offer(new Object(), LONG_DELAY_MS, MILLISECONDS);
663	>	q.offer(new Object(), 2 * LONG_DELAY_MS, MILLISECONDS);
664		shouldThrow();
665		} catch (InterruptedException success) {}
666		}});
667
668	<	t.start();
669	<	Thread.sleep(SMALL_DELAY_MS);
668	>	await(pleaseInterrupt);
669	>	assertThreadStaysAlive(t);
670		t.interrupt();
671	<	t.join();
671	>	awaitTermination(t);
672		}
673
674		/**
#	Line 683 | Line 682 | public class LinkedBlockingDequeTest ext
682		}
683
684		/**
685	<	* Take removes existing elements until empty, then blocks interruptibly
685	>	* take removes existing elements until empty, then blocks interruptibly
686		*/
687		public void testBlockingTake() throws InterruptedException {
688		final LinkedBlockingDeque q = populatedDeque(SIZE);
689	<	Thread t = new Thread(new CheckedRunnable() {
689	>	final CountDownLatch pleaseInterrupt = new CountDownLatch(1);
690	>	Thread t = newStartedThread(new CheckedRunnable() {
691		public void realRun() throws InterruptedException {
692	<	for (int i = 0; i < SIZE; ++i) {
693	<	assertEquals(i, q.take());
694	<	}
692	>	for (int i = 0; i < SIZE; i++) assertEquals(i, q.take());
693	>
694	>	Thread.currentThread().interrupt();
695		try {
696		q.take();
697		shouldThrow();
698		} catch (InterruptedException success) {}
699	+	assertFalse(Thread.interrupted());
700	+
701	+	pleaseInterrupt.countDown();
702	+	try {
703	+	q.take();
704	+	shouldThrow();
705	+	} catch (InterruptedException success) {}
706	+	assertFalse(Thread.interrupted());
707		}});
708
709	<	t.start();
710	<	Thread.sleep(SHORT_DELAY_MS);
709	>	await(pleaseInterrupt);
710	>	assertThreadBlocks(t, Thread.State.WAITING);
711		t.interrupt();
712	<	t.join();
712	>	awaitTermination(t);
713		}
714
707	–
715		/**
716		* poll succeeds unless empty
717		*/
#	Line 733 | Line 740 | public class LinkedBlockingDequeTest ext
740		public void testTimedPoll() throws InterruptedException {
741		LinkedBlockingDeque q = populatedDeque(SIZE);
742		for (int i = 0; i < SIZE; ++i) {
743	<	assertEquals(i, q.poll(SHORT_DELAY_MS, MILLISECONDS));
744	<	}
745	<	assertNull(q.poll(SHORT_DELAY_MS, MILLISECONDS));
743	>	long startTime = System.nanoTime();
744	>	assertEquals(i, q.poll(LONG_DELAY_MS, MILLISECONDS));
745	>	assertTrue(millisElapsedSince(startTime) < LONG_DELAY_MS);
746	>	}
747	>	long startTime = System.nanoTime();
748	>	assertNull(q.poll(timeoutMillis(), MILLISECONDS));
749	>	assertTrue(millisElapsedSince(startTime) >= timeoutMillis());
750	>	checkEmpty(q);
751		}
752
753		/**
#	Line 747 | Line 759 | public class LinkedBlockingDequeTest ext
759		final CountDownLatch aboutToWait = new CountDownLatch(1);
760		Thread t = newStartedThread(new CheckedRunnable() {
761		public void realRun() throws InterruptedException {
762	+	long startTime = System.nanoTime();
763		for (int i = 0; i < SIZE; ++i) {
751	–	long t0 = System.nanoTime();
764		assertEquals(i, (int) q.poll(LONG_DELAY_MS, MILLISECONDS));
753	–	assertTrue(millisElapsedSince(t0) < SMALL_DELAY_MS);
765		}
755	–	long t0 = System.nanoTime();
766		aboutToWait.countDown();
767		try {
768	<	q.poll(MEDIUM_DELAY_MS, MILLISECONDS);
768	>	q.poll(LONG_DELAY_MS, MILLISECONDS);
769		shouldThrow();
770		} catch (InterruptedException success) {
771	<	assertTrue(millisElapsedSince(t0) < MEDIUM_DELAY_MS);
771	>	assertTrue(millisElapsedSince(startTime) < LONG_DELAY_MS);
772		}
773		}});
774
775	<	aboutToWait.await();
776	<	waitForThreadToEnterWaitState(t, SMALL_DELAY_MS);
775	>	await(aboutToWait);
776	>	waitForThreadToEnterWaitState(t);
777		t.interrupt();
778	<	awaitTermination(t, MEDIUM_DELAY_MS);
778	>	awaitTermination(t);
779		checkEmpty(q);
780		}
781
782		/**
783		* putFirst(null) throws NPE
784		*/
785	<	public void testPutFirstNull() throws InterruptedException {
785	>	public void testPutFirstNull() throws InterruptedException {
786	>	LinkedBlockingDeque q = new LinkedBlockingDeque(SIZE);
787		try {
777	–	LinkedBlockingDeque q = new LinkedBlockingDeque(SIZE);
788		q.putFirst(null);
789		shouldThrow();
790		} catch (NullPointerException success) {}
791	<	}
791	>	}
792
793		/**
794		* all elements successfully putFirst are contained
795		*/
796	<	public void testPutFirst() throws InterruptedException {
797	<	LinkedBlockingDeque q = new LinkedBlockingDeque(SIZE);
798	<	for (int i = 0; i < SIZE; ++i) {
799	<	Integer I = new Integer(i);
800	<	q.putFirst(I);
801	<	assertTrue(q.contains(I));
802	<	}
803	<	assertEquals(0, q.remainingCapacity());
796	>	public void testPutFirst() throws InterruptedException {
797	>	LinkedBlockingDeque q = new LinkedBlockingDeque(SIZE);
798	>	for (int i = 0; i < SIZE; ++i) {
799	>	Integer x = new Integer(i);
800	>	q.putFirst(x);
801	>	assertTrue(q.contains(x));
802	>	}
803	>	assertEquals(0, q.remainingCapacity());
804		}
805
806		/**
#	Line 798 | Line 808 | public class LinkedBlockingDequeTest ext
808		*/
809		public void testBlockingPutFirst() throws InterruptedException {
810		final LinkedBlockingDeque q = new LinkedBlockingDeque(SIZE);
811	<	Thread t = new Thread(new CheckedRunnable() {
811	>	final CountDownLatch pleaseInterrupt = new CountDownLatch(1);
812	>	Thread t = newStartedThread(new CheckedRunnable() {
813		public void realRun() throws InterruptedException {
814		for (int i = 0; i < SIZE; ++i)
815		q.putFirst(i);
816		assertEquals(SIZE, q.size());
817		assertEquals(0, q.remainingCapacity());
818	+
819	+	Thread.currentThread().interrupt();
820	+	try {
821	+	q.putFirst(99);
822	+	shouldThrow();
823	+	} catch (InterruptedException success) {}
824	+	assertFalse(Thread.interrupted());
825	+
826	+	pleaseInterrupt.countDown();
827		try {
828		q.putFirst(99);
829		shouldThrow();
830		} catch (InterruptedException success) {}
831	+	assertFalse(Thread.interrupted());
832		}});
833
834	<	t.start();
835	<	Thread.sleep(SHORT_DELAY_MS);
834	>	await(pleaseInterrupt);
835	>	assertThreadStaysAlive(t);
836		t.interrupt();
837	<	t.join();
837	>	awaitTermination(t);
838		assertEquals(SIZE, q.size());
839		assertEquals(0, q.remainingCapacity());
840		}
841
842		/**
843	<	* putFirst blocks waiting for take when full
843	>	* putFirst blocks interruptibly waiting for take when full
844		*/
845		public void testPutFirstWithTake() throws InterruptedException {
846		final int capacity = 2;
847		final LinkedBlockingDeque q = new LinkedBlockingDeque(capacity);
848	<	Thread t = new Thread(new CheckedRunnable() {
848	>	final CountDownLatch pleaseTake = new CountDownLatch(1);
849	>	final CountDownLatch pleaseInterrupt = new CountDownLatch(1);
850	>	Thread t = newStartedThread(new CheckedRunnable() {
851		public void realRun() throws InterruptedException {
852	<	for (int i = 0; i < capacity + 1; i++)
852	>	for (int i = 0; i < capacity; i++)
853		q.putFirst(i);
854	+	pleaseTake.countDown();
855	+	q.putFirst(86);
856	+
857	+	pleaseInterrupt.countDown();
858		try {
859		q.putFirst(99);
860		shouldThrow();
861		} catch (InterruptedException success) {}
862	+	assertFalse(Thread.interrupted());
863		}});
864
865	<	t.start();
866	<	Thread.sleep(SHORT_DELAY_MS);
839	<	assertEquals(q.remainingCapacity(), 0);
865	>	await(pleaseTake);
866	>	assertEquals(0, q.remainingCapacity());
867		assertEquals(capacity - 1, q.take());
868	<	Thread.sleep(SHORT_DELAY_MS);
868	>
869	>	await(pleaseInterrupt);
870	>	assertThreadStaysAlive(t);
871		t.interrupt();
872	<	t.join();
873	<	assertEquals(q.remainingCapacity(), 0);
872	>	awaitTermination(t);
873	>	assertEquals(0, q.remainingCapacity());
874		}
875
876		/**
#	Line 849 | Line 878 | public class LinkedBlockingDequeTest ext
878		*/
879		public void testTimedOfferFirst() throws InterruptedException {
880		final LinkedBlockingDeque q = new LinkedBlockingDeque(2);
881	<	Thread t = new Thread(new CheckedRunnable() {
881	>	final CountDownLatch pleaseInterrupt = new CountDownLatch(1);
882	>	Thread t = newStartedThread(new CheckedRunnable() {
883		public void realRun() throws InterruptedException {
884		q.putFirst(new Object());
885		q.putFirst(new Object());
886	<	assertFalse(q.offerFirst(new Object(), SHORT_DELAY_MS, MILLISECONDS));
886	>	long startTime = System.nanoTime();
887	>	assertFalse(q.offerFirst(new Object(), timeoutMillis(), MILLISECONDS));
888	>	assertTrue(millisElapsedSince(startTime) >= timeoutMillis());
889	>	pleaseInterrupt.countDown();
890		try {
891	<	q.offerFirst(new Object(), LONG_DELAY_MS, MILLISECONDS);
891	>	q.offerFirst(new Object(), 2 * LONG_DELAY_MS, MILLISECONDS);
892		shouldThrow();
893		} catch (InterruptedException success) {}
894		}});
895
896	<	t.start();
897	<	Thread.sleep(SMALL_DELAY_MS);
896	>	await(pleaseInterrupt);
897	>	assertThreadStaysAlive(t);
898		t.interrupt();
899	<	t.join();
899	>	awaitTermination(t);
900		}
901
902		/**
#	Line 877 | Line 910 | public class LinkedBlockingDequeTest ext
910		}
911
912		/**
913	<	* takeFirst blocks interruptibly when empty
913	>	* takeFirst() blocks interruptibly when empty
914		*/
915	<	public void testTakeFirstFromEmpty() throws InterruptedException {
916	<	final LinkedBlockingDeque q = new LinkedBlockingDeque(2);
917	<	Thread t = new ThreadShouldThrow(InterruptedException.class) {
918	<	public void realRun() throws InterruptedException {
919	<	q.takeFirst();
920	<	}};
915	>	public void testTakeFirstFromEmptyBlocksInterruptibly() {
916	>	final BlockingDeque q = new LinkedBlockingDeque();
917	>	final CountDownLatch threadStarted = new CountDownLatch(1);
918	>	Thread t = newStartedThread(new CheckedRunnable() {
919	>	public void realRun() {
920	>	threadStarted.countDown();
921	>	try {
922	>	q.takeFirst();
923	>	shouldThrow();
924	>	} catch (InterruptedException success) {}
925	>	assertFalse(Thread.interrupted());
926	>	}});
927
928	<	t.start();
929	<	Thread.sleep(SHORT_DELAY_MS);
928	>	await(threadStarted);
929	>	assertThreadBlocks(t, Thread.State.WAITING);
930		t.interrupt();
931	<	t.join();
931	>	awaitTermination(t);
932		}
933
934		/**
935	<	* TakeFirst removes existing elements until empty, then blocks interruptibly
935	>	* takeFirst() throws InterruptedException immediately if interrupted
936	>	* before waiting
937	>	*/
938	>	public void testTakeFirstFromEmptyAfterInterrupt() {
939	>	final BlockingDeque q = new LinkedBlockingDeque();
940	>	Thread t = newStartedThread(new CheckedRunnable() {
941	>	public void realRun() {
942	>	Thread.currentThread().interrupt();
943	>	try {
944	>	q.takeFirst();
945	>	shouldThrow();
946	>	} catch (InterruptedException success) {}
947	>	assertFalse(Thread.interrupted());
948	>	}});
949	>
950	>	awaitTermination(t);
951	>	}
952	>
953	>	/**
954	>	* takeLast() blocks interruptibly when empty
955	>	*/
956	>	public void testTakeLastFromEmptyBlocksInterruptibly() {
957	>	final BlockingDeque q = new LinkedBlockingDeque();
958	>	final CountDownLatch threadStarted = new CountDownLatch(1);
959	>	Thread t = newStartedThread(new CheckedRunnable() {
960	>	public void realRun() {
961	>	threadStarted.countDown();
962	>	try {
963	>	q.takeLast();
964	>	shouldThrow();
965	>	} catch (InterruptedException success) {}
966	>	assertFalse(Thread.interrupted());
967	>	}});
968	>
969	>	await(threadStarted);
970	>	assertThreadBlocks(t, Thread.State.WAITING);
971	>	t.interrupt();
972	>	awaitTermination(t);
973	>	}
974	>
975	>	/**
976	>	* takeLast() throws InterruptedException immediately if interrupted
977	>	* before waiting
978	>	*/
979	>	public void testTakeLastFromEmptyAfterInterrupt() {
980	>	final BlockingDeque q = new LinkedBlockingDeque();
981	>	Thread t = newStartedThread(new CheckedRunnable() {
982	>	public void realRun() {
983	>	Thread.currentThread().interrupt();
984	>	try {
985	>	q.takeLast();
986	>	shouldThrow();
987	>	} catch (InterruptedException success) {}
988	>	assertFalse(Thread.interrupted());
989	>	}});
990	>
991	>	awaitTermination(t);
992	>	}
993	>
994	>	/**
995	>	* takeFirst removes existing elements until empty, then blocks interruptibly
996		*/
997		public void testBlockingTakeFirst() throws InterruptedException {
998		final LinkedBlockingDeque q = populatedDeque(SIZE);
999	<	Thread t = new Thread(new CheckedRunnable() {
999	>	final CountDownLatch pleaseInterrupt = new CountDownLatch(1);
1000	>	Thread t = newStartedThread(new CheckedRunnable() {
1001		public void realRun() throws InterruptedException {
1002	<	for (int i = 0; i < SIZE; ++i)
1003	<	assertEquals(i, q.takeFirst());
1002	>	for (int i = 0; i < SIZE; i++) assertEquals(i, q.takeFirst());
1003	>
1004	>	Thread.currentThread().interrupt();
1005	>	try {
1006	>	q.takeFirst();
1007	>	shouldThrow();
1008	>	} catch (InterruptedException success) {}
1009	>	assertFalse(Thread.interrupted());
1010	>
1011	>	pleaseInterrupt.countDown();
1012		try {
1013		q.takeFirst();
1014		shouldThrow();
1015		} catch (InterruptedException success) {}
1016	+	assertFalse(Thread.interrupted());
1017		}});
1018
1019	<	t.start();
1020	<	Thread.sleep(SHORT_DELAY_MS);
1019	>	await(pleaseInterrupt);
1020	>	assertThreadBlocks(t, Thread.State.WAITING);
1021		t.interrupt();
1022	<	t.join();
1022	>	awaitTermination(t);
1023		}
1024
916	–
1025		/**
1026		* timed pollFirst with zero timeout succeeds when non-empty, else times out
1027		*/
#	Line 931 | Line 1039 | public class LinkedBlockingDequeTest ext
1039		public void testTimedPollFirst() throws InterruptedException {
1040		LinkedBlockingDeque q = populatedDeque(SIZE);
1041		for (int i = 0; i < SIZE; ++i) {
1042	<	assertEquals(i, q.pollFirst(SHORT_DELAY_MS, MILLISECONDS));
1043	<	}
1044	<	assertNull(q.pollFirst(SHORT_DELAY_MS, MILLISECONDS));
1042	>	long startTime = System.nanoTime();
1043	>	assertEquals(i, q.pollFirst(LONG_DELAY_MS, MILLISECONDS));
1044	>	assertTrue(millisElapsedSince(startTime) < LONG_DELAY_MS);
1045	>	}
1046	>	long startTime = System.nanoTime();
1047	>	assertNull(q.pollFirst(timeoutMillis(), MILLISECONDS));
1048	>	assertTrue(millisElapsedSince(startTime) >= timeoutMillis());
1049	>	checkEmpty(q);
1050		}
1051
1052		/**
#	Line 941 | Line 1054 | public class LinkedBlockingDequeTest ext
1054		* returning timeout status
1055		*/
1056		public void testInterruptedTimedPollFirst() throws InterruptedException {
1057	<	Thread t = new Thread(new CheckedRunnable() {
1057	>	final LinkedBlockingDeque q = populatedDeque(SIZE);
1058	>	final CountDownLatch pleaseInterrupt = new CountDownLatch(1);
1059	>	Thread t = newStartedThread(new CheckedRunnable() {
1060		public void realRun() throws InterruptedException {
1061	<	LinkedBlockingDeque q = populatedDeque(SIZE);
1061	>	long startTime = System.nanoTime();
1062		for (int i = 0; i < SIZE; ++i) {
1063	<	assertEquals(i, q.pollFirst(SHORT_DELAY_MS, MILLISECONDS));
1063	>	assertEquals(i, q.pollFirst(LONG_DELAY_MS, MILLISECONDS));
1064		}
1065	+
1066	+	Thread.currentThread().interrupt();
1067		try {
1068	<	q.pollFirst(SMALL_DELAY_MS, MILLISECONDS);
1068	>	q.pollFirst(LONG_DELAY_MS, MILLISECONDS);
1069		shouldThrow();
1070		} catch (InterruptedException success) {}
1071	+	assertFalse(Thread.interrupted());
1072	+
1073	+	pleaseInterrupt.countDown();
1074	+	try {
1075	+	q.pollFirst(LONG_DELAY_MS, MILLISECONDS);
1076	+	shouldThrow();
1077	+	} catch (InterruptedException success) {}
1078	+	assertFalse(Thread.interrupted());
1079	+	assertTrue(millisElapsedSince(startTime) < LONG_DELAY_MS);
1080		}});
1081
1082	<	t.start();
1083	<	Thread.sleep(SHORT_DELAY_MS);
1082	>	await(pleaseInterrupt);
1083	>	assertThreadStaysAlive(t);
1084		t.interrupt();
1085	<	t.join();
1085	>	awaitTermination(t);
1086		}
1087
1088		/**
#	Line 965 | Line 1091 | public class LinkedBlockingDequeTest ext
1091		*/
1092		public void testTimedPollFirstWithOfferFirst() throws InterruptedException {
1093		final LinkedBlockingDeque q = new LinkedBlockingDeque(2);
1094	<	Thread t = new Thread(new CheckedRunnable() {
1094	>	final CheckedBarrier barrier = new CheckedBarrier(2);
1095	>	Thread t = newStartedThread(new CheckedRunnable() {
1096		public void realRun() throws InterruptedException {
1097	<	assertNull(q.pollFirst(SHORT_DELAY_MS, MILLISECONDS));
1097	>	long startTime = System.nanoTime();
1098	>	assertNull(q.pollFirst(timeoutMillis(), MILLISECONDS));
1099	>	assertTrue(millisElapsedSince(startTime) >= timeoutMillis());
1100	>
1101	>	barrier.await();
1102	>
1103		assertSame(zero, q.pollFirst(LONG_DELAY_MS, MILLISECONDS));
1104	+
1105	+	Thread.currentThread().interrupt();
1106	+	try {
1107	+	q.pollFirst(LONG_DELAY_MS, MILLISECONDS);
1108	+	shouldThrow();
1109	+	} catch (InterruptedException success) {}
1110	+
1111	+	barrier.await();
1112		try {
1113		q.pollFirst(LONG_DELAY_MS, MILLISECONDS);
1114		shouldThrow();
1115		} catch (InterruptedException success) {}
1116	+	assertTrue(millisElapsedSince(startTime) < LONG_DELAY_MS);
1117		}});
1118
1119	<	t.start();
1120	<	Thread.sleep(SMALL_DELAY_MS);
1121	<	assertTrue(q.offerFirst(zero, SHORT_DELAY_MS, MILLISECONDS));
1119	>	barrier.await();
1120	>	long startTime = System.nanoTime();
1121	>	assertTrue(q.offerFirst(zero, LONG_DELAY_MS, MILLISECONDS));
1122	>	assertTrue(millisElapsedSince(startTime) < LONG_DELAY_MS);
1123	>	barrier.await();
1124	>	assertThreadStaysAlive(t);
1125		t.interrupt();
1126	<	t.join();
1126	>	awaitTermination(t);
1127		}
1128
1129		/**
1130		* putLast(null) throws NPE
1131		*/
1132	<	public void testPutLastNull() throws InterruptedException {
1132	>	public void testPutLastNull() throws InterruptedException {
1133	>	LinkedBlockingDeque q = new LinkedBlockingDeque(SIZE);
1134		try {
990	–	LinkedBlockingDeque q = new LinkedBlockingDeque(SIZE);
1135		q.putLast(null);
1136		shouldThrow();
1137		} catch (NullPointerException success) {}
1138	<	}
1138	>	}
1139
1140		/**
1141		* all elements successfully putLast are contained
1142		*/
1143	<	public void testPutLast() throws InterruptedException {
1144	<	LinkedBlockingDeque q = new LinkedBlockingDeque(SIZE);
1145	<	for (int i = 0; i < SIZE; ++i) {
1146	<	Integer I = new Integer(i);
1147	<	q.putLast(I);
1148	<	assertTrue(q.contains(I));
1149	<	}
1150	<	assertEquals(0, q.remainingCapacity());
1143	>	public void testPutLast() throws InterruptedException {
1144	>	LinkedBlockingDeque q = new LinkedBlockingDeque(SIZE);
1145	>	for (int i = 0; i < SIZE; ++i) {
1146	>	Integer x = new Integer(i);
1147	>	q.putLast(x);
1148	>	assertTrue(q.contains(x));
1149	>	}
1150	>	assertEquals(0, q.remainingCapacity());
1151		}
1152
1153		/**
#	Line 1011 | Line 1155 | public class LinkedBlockingDequeTest ext
1155		*/
1156		public void testBlockingPutLast() throws InterruptedException {
1157		final LinkedBlockingDeque q = new LinkedBlockingDeque(SIZE);
1158	<	Thread t = new Thread(new CheckedRunnable() {
1158	>	final CountDownLatch pleaseInterrupt = new CountDownLatch(1);
1159	>	Thread t = newStartedThread(new CheckedRunnable() {
1160		public void realRun() throws InterruptedException {
1161		for (int i = 0; i < SIZE; ++i)
1162		q.putLast(i);
1163		assertEquals(SIZE, q.size());
1164		assertEquals(0, q.remainingCapacity());
1165	+
1166	+	Thread.currentThread().interrupt();
1167	+	try {
1168	+	q.putLast(99);
1169	+	shouldThrow();
1170	+	} catch (InterruptedException success) {}
1171	+	assertFalse(Thread.interrupted());
1172	+
1173	+	pleaseInterrupt.countDown();
1174		try {
1175		q.putLast(99);
1176		shouldThrow();
1177		} catch (InterruptedException success) {}
1178	+	assertFalse(Thread.interrupted());
1179		}});
1180
1181	<	t.start();
1182	<	Thread.sleep(SHORT_DELAY_MS);
1181	>	await(pleaseInterrupt);
1182	>	assertThreadStaysAlive(t);
1183		t.interrupt();
1184	<	t.join();
1184	>	awaitTermination(t);
1185		assertEquals(SIZE, q.size());
1186		assertEquals(0, q.remainingCapacity());
1187		}
1188
1189		/**
1190	<	* putLast blocks waiting for take when full
1190	>	* putLast blocks interruptibly waiting for take when full
1191		*/
1192		public void testPutLastWithTake() throws InterruptedException {
1193		final int capacity = 2;
1194		final LinkedBlockingDeque q = new LinkedBlockingDeque(capacity);
1195	<	Thread t = new Thread(new CheckedRunnable() {
1195	>	final CountDownLatch pleaseTake = new CountDownLatch(1);
1196	>	final CountDownLatch pleaseInterrupt = new CountDownLatch(1);
1197	>	Thread t = newStartedThread(new CheckedRunnable() {
1198		public void realRun() throws InterruptedException {
1199	<	for (int i = 0; i < capacity + 1; i++)
1199	>	for (int i = 0; i < capacity; i++)
1200		q.putLast(i);
1201	+	pleaseTake.countDown();
1202	+	q.putLast(86);
1203	+
1204	+	pleaseInterrupt.countDown();
1205		try {
1206		q.putLast(99);
1207		shouldThrow();
1208		} catch (InterruptedException success) {}
1209	+	assertFalse(Thread.interrupted());
1210		}});
1211
1212	<	t.start();
1213	<	Thread.sleep(SHORT_DELAY_MS);
1052	<	assertEquals(q.remainingCapacity(), 0);
1212	>	await(pleaseTake);
1213	>	assertEquals(0, q.remainingCapacity());
1214		assertEquals(0, q.take());
1215	<	Thread.sleep(SHORT_DELAY_MS);
1215	>
1216	>	await(pleaseInterrupt);
1217	>	assertThreadStaysAlive(t);
1218		t.interrupt();
1219	<	t.join();
1220	<	assertEquals(q.remainingCapacity(), 0);
1219	>	awaitTermination(t);
1220	>	assertEquals(0, q.remainingCapacity());
1221		}
1222
1223		/**
#	Line 1062 | Line 1225 | public class LinkedBlockingDequeTest ext
1225		*/
1226		public void testTimedOfferLast() throws InterruptedException {
1227		final LinkedBlockingDeque q = new LinkedBlockingDeque(2);
1228	<	Thread t = new Thread(new CheckedRunnable() {
1228	>	final CountDownLatch pleaseInterrupt = new CountDownLatch(1);
1229	>	Thread t = newStartedThread(new CheckedRunnable() {
1230		public void realRun() throws InterruptedException {
1231		q.putLast(new Object());
1232		q.putLast(new Object());
1233	<	assertFalse(q.offerLast(new Object(), SHORT_DELAY_MS, MILLISECONDS));
1233	>	long startTime = System.nanoTime();
1234	>	assertFalse(q.offerLast(new Object(), timeoutMillis(), MILLISECONDS));
1235	>	assertTrue(millisElapsedSince(startTime) >= timeoutMillis());
1236	>	pleaseInterrupt.countDown();
1237		try {
1238	<	q.offerLast(new Object(), LONG_DELAY_MS, MILLISECONDS);
1238	>	q.offerLast(new Object(), 2 * LONG_DELAY_MS, MILLISECONDS);
1239		shouldThrow();
1240		} catch (InterruptedException success) {}
1241		}});
1242
1243	<	t.start();
1244	<	Thread.sleep(SMALL_DELAY_MS);
1243	>	await(pleaseInterrupt);
1244	>	assertThreadStaysAlive(t);
1245		t.interrupt();
1246	<	t.join();
1246	>	awaitTermination(t);
1247		}
1248
1249		/**
#	Line 1085 | Line 1252 | public class LinkedBlockingDequeTest ext
1252		public void testTakeLast() throws InterruptedException {
1253		LinkedBlockingDeque q = populatedDeque(SIZE);
1254		for (int i = 0; i < SIZE; ++i) {
1255	<	assertEquals(SIZE-i-1, q.takeLast());
1255	>	assertEquals(SIZE - i - 1, q.takeLast());
1256		}
1257		}
1258
1259		/**
1260	<	* takeLast blocks interruptibly when empty
1094	<	*/
1095	<	public void testTakeLastFromEmpty() throws InterruptedException {
1096	<	final LinkedBlockingDeque q = new LinkedBlockingDeque(2);
1097	<	Thread t = new ThreadShouldThrow(InterruptedException.class) {
1098	<	public void realRun() throws InterruptedException {
1099	<	q.takeLast();
1100	<	}};
1101	<
1102	<	t.start();
1103	<	Thread.sleep(SHORT_DELAY_MS);
1104	<	t.interrupt();
1105	<	t.join();
1106	<	}
1107	<
1108	<	/**
1109	<	* TakeLast removes existing elements until empty, then blocks interruptibly
1260	>	* takeLast removes existing elements until empty, then blocks interruptibly
1261		*/
1262		public void testBlockingTakeLast() throws InterruptedException {
1263		final LinkedBlockingDeque q = populatedDeque(SIZE);
1264	<	Thread t = new Thread(new CheckedRunnable() {
1264	>	final CountDownLatch pleaseInterrupt = new CountDownLatch(1);
1265	>	Thread t = newStartedThread(new CheckedRunnable() {
1266		public void realRun() throws InterruptedException {
1267	<	for (int i = 0; i < SIZE; ++i)
1268	<	assertEquals(SIZE - 1 - i, q.takeLast());
1267	>	for (int i = 0; i < SIZE; i++)
1268	>	assertEquals(SIZE - i - 1, q.takeLast());
1269	>
1270	>	Thread.currentThread().interrupt();
1271		try {
1272		q.takeLast();
1273		shouldThrow();
1274		} catch (InterruptedException success) {}
1275	+	assertFalse(Thread.interrupted());
1276	+
1277	+	pleaseInterrupt.countDown();
1278	+	try {
1279	+	q.takeLast();
1280	+	shouldThrow();
1281	+	} catch (InterruptedException success) {}
1282	+	assertFalse(Thread.interrupted());
1283		}});
1284
1285	<	t.start();
1286	<	Thread.sleep(SHORT_DELAY_MS);
1285	>	await(pleaseInterrupt);
1286	>	assertThreadBlocks(t, Thread.State.WAITING);
1287		t.interrupt();
1288	<	t.join();
1288	>	awaitTermination(t);
1289		}
1290
1291		/**
#	Line 1132 | Line 1294 | public class LinkedBlockingDequeTest ext
1294		public void testTimedPollLast0() throws InterruptedException {
1295		LinkedBlockingDeque q = populatedDeque(SIZE);
1296		for (int i = 0; i < SIZE; ++i) {
1297	<	assertEquals(SIZE-i-1, q.pollLast(0, MILLISECONDS));
1297	>	assertEquals(SIZE - i - 1, q.pollLast(0, MILLISECONDS));
1298		}
1299		assertNull(q.pollLast(0, MILLISECONDS));
1300		}
#	Line 1143 | Line 1305 | public class LinkedBlockingDequeTest ext
1305		public void testTimedPollLast() throws InterruptedException {
1306		LinkedBlockingDeque q = populatedDeque(SIZE);
1307		for (int i = 0; i < SIZE; ++i) {
1308	<	assertEquals(SIZE-i-1, q.pollLast(SHORT_DELAY_MS, MILLISECONDS));
1309	<	}
1310	<	assertNull(q.pollLast(SHORT_DELAY_MS, MILLISECONDS));
1308	>	long startTime = System.nanoTime();
1309	>	assertEquals(SIZE - i - 1, q.pollLast(LONG_DELAY_MS, MILLISECONDS));
1310	>	assertTrue(millisElapsedSince(startTime) < LONG_DELAY_MS);
1311	>	}
1312	>	long startTime = System.nanoTime();
1313	>	assertNull(q.pollLast(timeoutMillis(), MILLISECONDS));
1314	>	assertTrue(millisElapsedSince(startTime) >= timeoutMillis());
1315	>	checkEmpty(q);
1316		}
1317
1318		/**
#	Line 1153 | Line 1320 | public class LinkedBlockingDequeTest ext
1320		* returning timeout status
1321		*/
1322		public void testInterruptedTimedPollLast() throws InterruptedException {
1323	<	Thread t = new Thread(new CheckedRunnable() {
1323	>	final LinkedBlockingDeque q = populatedDeque(SIZE);
1324	>	final CountDownLatch pleaseInterrupt = new CountDownLatch(1);
1325	>	Thread t = newStartedThread(new CheckedRunnable() {
1326		public void realRun() throws InterruptedException {
1327	<	LinkedBlockingDeque q = populatedDeque(SIZE);
1327	>	long startTime = System.nanoTime();
1328		for (int i = 0; i < SIZE; ++i) {
1329	<	assertEquals(SIZE-i-1, q.pollLast(SHORT_DELAY_MS, MILLISECONDS));
1329	>	assertEquals(SIZE - i - 1,
1330	>	q.pollLast(LONG_DELAY_MS, MILLISECONDS));
1331		}
1332	+
1333	+	Thread.currentThread().interrupt();
1334	+	try {
1335	+	q.pollLast(LONG_DELAY_MS, MILLISECONDS);
1336	+	shouldThrow();
1337	+	} catch (InterruptedException success) {}
1338	+	assertFalse(Thread.interrupted());
1339	+
1340	+	pleaseInterrupt.countDown();
1341		try {
1342	<	q.pollLast(SMALL_DELAY_MS, MILLISECONDS);
1342	>	q.pollLast(LONG_DELAY_MS, MILLISECONDS);
1343		shouldThrow();
1344		} catch (InterruptedException success) {}
1345	+	assertFalse(Thread.interrupted());
1346	+
1347	+	assertTrue(millisElapsedSince(startTime) < LONG_DELAY_MS);
1348		}});
1349
1350	<	t.start();
1351	<	Thread.sleep(SHORT_DELAY_MS);
1350	>	await(pleaseInterrupt);
1351	>	assertThreadStaysAlive(t);
1352		t.interrupt();
1353	<	t.join();
1353	>	awaitTermination(t);
1354	>	checkEmpty(q);
1355		}
1356
1357		/**
#	Line 1177 | Line 1360 | public class LinkedBlockingDequeTest ext
1360		*/
1361		public void testTimedPollWithOfferLast() throws InterruptedException {
1362		final LinkedBlockingDeque q = new LinkedBlockingDeque(2);
1363	<	Thread t = new Thread(new CheckedRunnable() {
1363	>	final CheckedBarrier barrier = new CheckedBarrier(2);
1364	>	Thread t = newStartedThread(new CheckedRunnable() {
1365		public void realRun() throws InterruptedException {
1366	<	assertNull(q.poll(SHORT_DELAY_MS, MILLISECONDS));
1366	>	long startTime = System.nanoTime();
1367	>	assertNull(q.poll(timeoutMillis(), MILLISECONDS));
1368	>	assertTrue(millisElapsedSince(startTime) >= timeoutMillis());
1369	>
1370	>	barrier.await();
1371	>
1372		assertSame(zero, q.poll(LONG_DELAY_MS, MILLISECONDS));
1373	+
1374	+	Thread.currentThread().interrupt();
1375		try {
1376		q.poll(LONG_DELAY_MS, MILLISECONDS);
1377		shouldThrow();
1378		} catch (InterruptedException success) {}
1379	+	assertFalse(Thread.interrupted());
1380	+
1381	+	barrier.await();
1382	+	try {
1383	+	q.poll(LONG_DELAY_MS, MILLISECONDS);
1384	+	shouldThrow();
1385	+	} catch (InterruptedException success) {}
1386	+	assertFalse(Thread.interrupted());
1387	+
1388	+	assertTrue(millisElapsedSince(startTime) < LONG_DELAY_MS);
1389		}});
1390
1391	<	t.start();
1392	<	Thread.sleep(SMALL_DELAY_MS);
1393	<	assertTrue(q.offerLast(zero, SHORT_DELAY_MS, MILLISECONDS));
1391	>	barrier.await();
1392	>	long startTime = System.nanoTime();
1393	>	assertTrue(q.offerLast(zero, LONG_DELAY_MS, MILLISECONDS));
1394	>	assertTrue(millisElapsedSince(startTime) < LONG_DELAY_MS);
1395	>
1396	>	barrier.await();
1397	>	assertThreadStaysAlive(t);
1398		t.interrupt();
1399	<	t.join();
1399	>	awaitTermination(t);
1400		}
1401
1197	–
1402		/**
1403		* element returns next element, or throws NSEE if empty
1404		*/
#	Line 1211 | Line 1415 | public class LinkedBlockingDequeTest ext
1415		}
1416
1417		/**
1214	–	* remove(x) removes x and returns true if present
1215	–	*/
1216	–	public void testRemoveElement() {
1217	–	LinkedBlockingDeque q = populatedDeque(SIZE);
1218	–	for (int i = 1; i < SIZE; i+=2) {
1219	–	assertTrue(q.contains(i));
1220	–	assertTrue(q.remove(i));
1221	–	assertFalse(q.contains(i));
1222	–	assertTrue(q.contains(i-1));
1223	–	}
1224	–	for (int i = 0; i < SIZE; i+=2) {
1225	–	assertTrue(q.contains(i));
1226	–	assertTrue(q.remove(i));
1227	–	assertFalse(q.contains(i));
1228	–	assertFalse(q.remove(i+1));
1229	–	assertFalse(q.contains(i+1));
1230	–	}
1231	–	assertTrue(q.isEmpty());
1232	–	}
1233	–
1234	–	/**
1418		* contains(x) reports true when elements added but not yet removed
1419		*/
1420		public void testContains() {
#	Line 1287 | Line 1470 | public class LinkedBlockingDequeTest ext
1470		assertTrue(changed);
1471
1472		assertTrue(q.containsAll(p));
1473	<	assertEquals(SIZE-i, q.size());
1473	>	assertEquals(SIZE - i, q.size());
1474		p.remove();
1475		}
1476		}
#	Line 1300 | Line 1483 | public class LinkedBlockingDequeTest ext
1483		LinkedBlockingDeque q = populatedDeque(SIZE);
1484		LinkedBlockingDeque p = populatedDeque(i);
1485		assertTrue(q.removeAll(p));
1486	<	assertEquals(SIZE-i, q.size());
1486	>	assertEquals(SIZE - i, q.size());
1487		for (int j = 0; j < i; ++j) {
1488	<	Integer I = (Integer)(p.remove());
1489	<	assertFalse(q.contains(I));
1488	>	Integer x = (Integer)(p.remove());
1489	>	assertFalse(q.contains(x));
1490		}
1491		}
1492		}
#	Line 1311 | Line 1494 | public class LinkedBlockingDequeTest ext
1494		/**
1495		* toArray contains all elements in FIFO order
1496		*/
1497	<	public void testToArray() throws InterruptedException{
1497	>	public void testToArray() throws InterruptedException {
1498		LinkedBlockingDeque q = populatedDeque(SIZE);
1499		Object[] o = q.toArray();
1500		for (int i = 0; i < o.length; i++)
#	Line 1331 | Line 1514 | public class LinkedBlockingDequeTest ext
1514		}
1515
1516		/**
1334	–	* toArray(null) throws NullPointerException
1335	–	*/
1336	–	public void testToArray_NullArg() {
1337	–	LinkedBlockingDeque q = populatedDeque(SIZE);
1338	–	try {
1339	–	q.toArray(null);
1340	–	shouldThrow();
1341	–	} catch (NullPointerException success) {}
1342	–	}
1343	–
1344	–	/**
1517		* toArray(incompatible array type) throws ArrayStoreException
1518		*/
1519		public void testToArray1_BadArg() {
#	Line 1352 | Line 1524 | public class LinkedBlockingDequeTest ext
1524		} catch (ArrayStoreException success) {}
1525		}
1526
1355	–
1527		/**
1528		* iterator iterates through all elements
1529		*/
1530		public void testIterator() throws InterruptedException {
1531		LinkedBlockingDeque q = populatedDeque(SIZE);
1532		Iterator it = q.iterator();
1533	<	while (it.hasNext()) {
1533	>	int i;
1534	>	for (i = 0; it.hasNext(); i++)
1535	>	assertTrue(q.contains(it.next()));
1536	>	assertEquals(i, SIZE);
1537	>	assertIteratorExhausted(it);
1538	>
1539	>	it = q.iterator();
1540	>	for (i = 0; it.hasNext(); i++)
1541		assertEquals(it.next(), q.take());
1542	<	}
1542	>	assertEquals(i, SIZE);
1543	>	assertIteratorExhausted(it);
1544	>	}
1545	>
1546	>	/**
1547	>	* iterator of empty collection has no elements
1548	>	*/
1549	>	public void testEmptyIterator() {
1550	>	Deque c = new LinkedBlockingDeque();
1551	>	assertIteratorExhausted(c.iterator());
1552	>	assertIteratorExhausted(c.descendingIterator());
1553		}
1554
1555		/**
#	Line 1383 | Line 1571 | public class LinkedBlockingDequeTest ext
1571		assertFalse(it.hasNext());
1572		}
1573
1386	–
1574		/**
1575		* iterator ordering is FIFO
1576		*/
#	Line 1415 | Line 1602 | public class LinkedBlockingDequeTest ext
1602		assertEquals(0, q.size());
1603		}
1604
1418	–
1605		/**
1606		* Descending iterator iterates through all elements
1607		*/
#	Line 1478 | Line 1664 | public class LinkedBlockingDequeTest ext
1664		}
1665		}
1666
1481	–
1667		/**
1668		* toString contains toStrings of elements
1669		*/
#	Line 1486 | Line 1671 | public class LinkedBlockingDequeTest ext
1671		LinkedBlockingDeque q = populatedDeque(SIZE);
1672		String s = q.toString();
1673		for (int i = 0; i < SIZE; ++i) {
1674	<	assertTrue(s.indexOf(String.valueOf(i)) >= 0);
1674	>	assertTrue(s.contains(String.valueOf(i)));
1675		}
1676		}
1677
1493	–
1678		/**
1679		* offer transfers elements across Executor tasks
1680		*/
#	Line 1498 | Line 1682 | public class LinkedBlockingDequeTest ext
1682		final LinkedBlockingDeque q = new LinkedBlockingDeque(2);
1683		q.add(one);
1684		q.add(two);
1685	<	ExecutorService executor = Executors.newFixedThreadPool(2);
1686	<	executor.execute(new CheckedRunnable() {
1687	<	public void realRun() throws InterruptedException {
1688	<	assertFalse(q.offer(three));
1689	<	assertTrue(q.offer(three, MEDIUM_DELAY_MS, MILLISECONDS));
1690	<	assertEquals(0, q.remainingCapacity());
1691	<	}});
1692	<
1693	<	executor.execute(new CheckedRunnable() {
1694	<	public void realRun() throws InterruptedException {
1695	<	Thread.sleep(SMALL_DELAY_MS);
1696	<	assertSame(one, q.take());
1697	<	}});
1698	<
1699	<	joinPool(executor);
1685	>	final CheckedBarrier threadsStarted = new CheckedBarrier(2);
1686	>	final ExecutorService executor = Executors.newFixedThreadPool(2);
1687	>	try (PoolCleaner cleaner = cleaner(executor)) {
1688	>	executor.execute(new CheckedRunnable() {
1689	>	public void realRun() throws InterruptedException {
1690	>	assertFalse(q.offer(three));
1691	>	threadsStarted.await();
1692	>	assertTrue(q.offer(three, LONG_DELAY_MS, MILLISECONDS));
1693	>	assertEquals(0, q.remainingCapacity());
1694	>	}});
1695	>
1696	>	executor.execute(new CheckedRunnable() {
1697	>	public void realRun() throws InterruptedException {
1698	>	threadsStarted.await();
1699	>	assertSame(one, q.take());
1700	>	}});
1701	>	}
1702		}
1703
1704		/**
1705	<	* poll retrieves elements across Executor threads
1705	>	* timed poll retrieves elements across Executor threads
1706		*/
1707		public void testPollInExecutor() {
1708		final LinkedBlockingDeque q = new LinkedBlockingDeque(2);
1709	<	ExecutorService executor = Executors.newFixedThreadPool(2);
1710	<	executor.execute(new CheckedRunnable() {
1711	<	public void realRun() throws InterruptedException {
1712	<	assertNull(q.poll());
1713	<	assertSame(one, q.poll(MEDIUM_DELAY_MS, MILLISECONDS));
1714	<	assertTrue(q.isEmpty());
1715	<	}});
1716	<
1717	<	executor.execute(new CheckedRunnable() {
1718	<	public void realRun() throws InterruptedException {
1719	<	Thread.sleep(SMALL_DELAY_MS);
1720	<	q.put(one);
1721	<	}});
1722	<
1723	<	joinPool(executor);
1709	>	final CheckedBarrier threadsStarted = new CheckedBarrier(2);
1710	>	final ExecutorService executor = Executors.newFixedThreadPool(2);
1711	>	try (PoolCleaner cleaner = cleaner(executor)) {
1712	>	executor.execute(new CheckedRunnable() {
1713	>	public void realRun() throws InterruptedException {
1714	>	assertNull(q.poll());
1715	>	threadsStarted.await();
1716	>	assertSame(one, q.poll(LONG_DELAY_MS, MILLISECONDS));
1717	>	checkEmpty(q);
1718	>	}});
1719	>
1720	>	executor.execute(new CheckedRunnable() {
1721	>	public void realRun() throws InterruptedException {
1722	>	threadsStarted.await();
1723	>	q.put(one);
1724	>	}});
1725	>	}
1726		}
1727
1728		/**
1729		* A deserialized serialized deque has same elements in same order
1730		*/
1731		public void testSerialization() throws Exception {
1732	<	LinkedBlockingDeque q = populatedDeque(SIZE);
1732	>	Queue x = populatedDeque(SIZE);
1733	>	Queue y = serialClone(x);
1734
1735	<	ByteArrayOutputStream bout = new ByteArrayOutputStream(10000);
1736	<	ObjectOutputStream out = new ObjectOutputStream(new BufferedOutputStream(bout));
1737	<	out.writeObject(q);
1738	<	out.close();
1739	<
1740	<	ByteArrayInputStream bin = new ByteArrayInputStream(bout.toByteArray());
1741	<	ObjectInputStream in = new ObjectInputStream(new BufferedInputStream(bin));
1742	<	LinkedBlockingDeque r = (LinkedBlockingDeque)in.readObject();
1743	<	assertEquals(q.size(), r.size());
1555	<	while (!q.isEmpty())
1556	<	assertEquals(q.remove(), r.remove());
1557	<	}
1558	<
1559	<	/**
1560	<	* drainTo(null) throws NPE
1561	<	*/
1562	<	public void testDrainToNull() {
1563	<	LinkedBlockingDeque q = populatedDeque(SIZE);
1564	<	try {
1565	<	q.drainTo(null);
1566	<	shouldThrow();
1567	<	} catch (NullPointerException success) {}
1568	<	}
1569	<
1570	<	/**
1571	<	* drainTo(this) throws IAE
1572	<	*/
1573	<	public void testDrainToSelf() {
1574	<	LinkedBlockingDeque q = populatedDeque(SIZE);
1575	<	try {
1576	<	q.drainTo(q);
1577	<	shouldThrow();
1578	<	} catch (IllegalArgumentException success) {}
1735	>	assertNotSame(y, x);
1736	>	assertEquals(x.size(), y.size());
1737	>	assertEquals(x.toString(), y.toString());
1738	>	assertTrue(Arrays.equals(x.toArray(), y.toArray()));
1739	>	while (!x.isEmpty()) {
1740	>	assertFalse(y.isEmpty());
1741	>	assertEquals(x.remove(), y.remove());
1742	>	}
1743	>	assertTrue(y.isEmpty());
1744		}
1745
1746		/**
#	Line 1585 | Line 1750 | public class LinkedBlockingDequeTest ext
1750		LinkedBlockingDeque q = populatedDeque(SIZE);
1751		ArrayList l = new ArrayList();
1752		q.drainTo(l);
1753	<	assertEquals(q.size(), 0);
1754	<	assertEquals(l.size(), SIZE);
1753	>	assertEquals(0, q.size());
1754	>	assertEquals(SIZE, l.size());
1755		for (int i = 0; i < SIZE; ++i)
1756		assertEquals(l.get(i), new Integer(i));
1757		q.add(zero);
#	Line 1596 | Line 1761 | public class LinkedBlockingDequeTest ext
1761		assertTrue(q.contains(one));
1762		l.clear();
1763		q.drainTo(l);
1764	<	assertEquals(q.size(), 0);
1765	<	assertEquals(l.size(), 2);
1764	>	assertEquals(0, q.size());
1765	>	assertEquals(2, l.size());
1766		for (int i = 0; i < 2; ++i)
1767		assertEquals(l.get(i), new Integer(i));
1768		}
#	Line 1609 | Line 1774 | public class LinkedBlockingDequeTest ext
1774		final LinkedBlockingDeque q = populatedDeque(SIZE);
1775		Thread t = new Thread(new CheckedRunnable() {
1776		public void realRun() throws InterruptedException {
1777	<	q.put(new Integer(SIZE+1));
1777	>	q.put(new Integer(SIZE + 1));
1778		}});
1779
1780		t.start();
#	Line 1623 | Line 1788 | public class LinkedBlockingDequeTest ext
1788		}
1789
1790		/**
1626	–	* drainTo(null, n) throws NPE
1627	–	*/
1628	–	public void testDrainToNullN() {
1629	–	LinkedBlockingDeque q = populatedDeque(SIZE);
1630	–	try {
1631	–	q.drainTo(null, 0);
1632	–	shouldThrow();
1633	–	} catch (NullPointerException success) {}
1634	–	}
1635	–
1636	–	/**
1637	–	* drainTo(this, n) throws IAE
1638	–	*/
1639	–	public void testDrainToSelfN() {
1640	–	LinkedBlockingDeque q = populatedDeque(SIZE);
1641	–	try {
1642	–	q.drainTo(q, 0);
1643	–	shouldThrow();
1644	–	} catch (IllegalArgumentException success) {}
1645	–	}
1646	–
1647	–	/**
1791		* drainTo(c, n) empties first min(n, size) elements of queue into c
1792		*/
1793		public void testDrainToN() {
#	Line 1655 | Line 1798 | public class LinkedBlockingDequeTest ext
1798		ArrayList l = new ArrayList();
1799		q.drainTo(l, i);
1800		int k = (i < SIZE) ? i : SIZE;
1801	<	assertEquals(l.size(), k);
1802	<	assertEquals(q.size(), SIZE-k);
1801	>	assertEquals(k, l.size());
1802	>	assertEquals(SIZE - k, q.size());
1803		for (int j = 0; j < k; ++j)
1804		assertEquals(l.get(j), new Integer(j));
1805	<	while (q.poll() != null) ;
1805	>	do {} while (q.poll() != null);
1806	>	}
1807	>	}
1808	>
1809	>	/**
1810	>	* remove(null), contains(null) always return false
1811	>	*/
1812	>	public void testNeverContainsNull() {
1813	>	Deque<?>[] qs = {
1814	>	new LinkedBlockingDeque<Object>(),
1815	>	populatedDeque(2),
1816	>	};
1817	>
1818	>	for (Deque<?> q : qs) {
1819	>	assertFalse(q.contains(null));
1820	>	assertFalse(q.remove(null));
1821	>	assertFalse(q.removeFirstOccurrence(null));
1822	>	assertFalse(q.removeLastOccurrence(null));
1823		}
1824		}
1825

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