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

Comparing jsr166/src/test/tck/LinkedTransferQueueTest.java (file contents):
Revision 1.38 by jsr166, Thu Nov 4 01:04:54 2010 UTC vs.
Revision 1.53 by jsr166, Sun Nov 23 22:27:06 2014 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;
14	<	import java.util.ArrayList;
8	>	import junit.framework.*;
9		import java.util.Arrays;
10	+	import java.util.ArrayList;
11	+	import java.util.Collection;
12		import java.util.Iterator;
13		import java.util.List;
14		import java.util.NoSuchElementException;
15	<	import java.util.concurrent.*;
15	>	import java.util.Queue;
16	>	import java.util.concurrent.BlockingQueue;
17	>	import java.util.concurrent.CountDownLatch;
18	>	import java.util.concurrent.Executors;
19	>	import java.util.concurrent.ExecutorService;
20	>	import java.util.concurrent.LinkedTransferQueue;
21		import static java.util.concurrent.TimeUnit.MILLISECONDS;
22		import static java.util.concurrent.TimeUnit.NANOSECONDS;
22	–	import junit.framework.Test;
23	–	import junit.framework.TestSuite;
23
24		@SuppressWarnings({"unchecked", "rawtypes"})
25		public class LinkedTransferQueueTest extends JSR166TestCase {
#	Line 40 | Line 39 | public class LinkedTransferQueueTest ext
39		new Generic().testSuite());
40		}
41
43	–	void checkEmpty(BlockingQueue q) {
44	–	try {
45	–	assertTrue(q.isEmpty());
46	–	assertEquals(0, q.size());
47	–	assertNull(q.peek());
48	–	assertNull(q.poll());
49	–	assertNull(q.poll(0, MILLISECONDS));
50	–	assertEquals(q.toString(), "[]");
51	–	assertTrue(Arrays.equals(q.toArray(), new Object[0]));
52	–	assertFalse(q.iterator().hasNext());
53	–	try {
54	–	q.element();
55	–	shouldThrow();
56	–	} catch (NoSuchElementException success) {}
57	–	try {
58	–	q.iterator().next();
59	–	shouldThrow();
60	–	} catch (NoSuchElementException success) {}
61	–	try {
62	–	q.remove();
63	–	shouldThrow();
64	–	} catch (NoSuchElementException success) {}
65	–	} catch (InterruptedException ie) {
66	–	threadUnexpectedException(ie);
67	–	}
68	–	}
69	–
42		/**
43		* Constructor builds new queue with size being zero and empty
44		* being true
#	Line 92 | Line 64 | public class LinkedTransferQueueTest ext
64		* NullPointerException
65		*/
66		public void testConstructor3() {
67	+	Collection<Integer> elements = Arrays.asList(new Integer[SIZE]);
68		try {
69	<	Integer[] ints = new Integer[SIZE];
97	<	new LinkedTransferQueue(Arrays.asList(ints));
69	>	new LinkedTransferQueue(elements);
70		shouldThrow();
71		} catch (NullPointerException success) {}
72		}
#	Line 104 | Line 76 | public class LinkedTransferQueueTest ext
76		* throws NullPointerException
77		*/
78		public void testConstructor4() {
79	+	Integer[] ints = new Integer[SIZE];
80	+	for (int i = 0; i < SIZE-1; ++i)
81	+	ints[i] = i;
82	+	Collection<Integer> elements = Arrays.asList(ints);
83		try {
84	<	Integer[] ints = new Integer[SIZE];
109	<	for (int i = 0; i < SIZE - 1; ++i) {
110	<	ints[i] = i;
111	<	}
112	<	new LinkedTransferQueue(Arrays.asList(ints));
84	>	new LinkedTransferQueue(elements);
85		shouldThrow();
86		} catch (NullPointerException success) {}
87		}
#	Line 156 | Line 128 | public class LinkedTransferQueueTest ext
128		}
129
130		/**
159	–	* offer(null) throws NullPointerException
160	–	*/
161	–	public void testOfferNull() {
162	–	try {
163	–	LinkedTransferQueue q = new LinkedTransferQueue();
164	–	q.offer(null);
165	–	shouldThrow();
166	–	} catch (NullPointerException success) {}
167	–	}
168	–
169	–	/**
170	–	* add(null) throws NullPointerException
171	–	*/
172	–	public void testAddNull() {
173	–	try {
174	–	LinkedTransferQueue q = new LinkedTransferQueue();
175	–	q.add(null);
176	–	shouldThrow();
177	–	} catch (NullPointerException success) {}
178	–	}
179	–
180	–	/**
181	–	* addAll(null) throws NullPointerException
182	–	*/
183	–	public void testAddAll1() {
184	–	try {
185	–	LinkedTransferQueue q = new LinkedTransferQueue();
186	–	q.addAll(null);
187	–	shouldThrow();
188	–	} catch (NullPointerException success) {}
189	–	}
190	–
191	–	/**
131		* addAll(this) throws IllegalArgumentException
132		*/
133		public void testAddAllSelf() {
#	Line 200 | Line 139 | public class LinkedTransferQueueTest ext
139		}
140
141		/**
203	–	* addAll of a collection with null elements throws NullPointerException
204	–	*/
205	–	public void testAddAll2() {
206	–	try {
207	–	LinkedTransferQueue q = new LinkedTransferQueue();
208	–	Integer[] ints = new Integer[SIZE];
209	–	q.addAll(Arrays.asList(ints));
210	–	shouldThrow();
211	–	} catch (NullPointerException success) {}
212	–	}
213	–
214	–	/**
142		* addAll of a collection with any null elements throws
143		* NullPointerException after possibly adding some elements
144		*/
#	Line 245 | Line 172 | public class LinkedTransferQueueTest ext
172		}
173
174		/**
248	–	* put(null) throws NullPointerException
249	–	*/
250	–	public void testPutNull() throws InterruptedException {
251	–	try {
252	–	LinkedTransferQueue q = new LinkedTransferQueue();
253	–	q.put(null);
254	–	shouldThrow();
255	–	} catch (NullPointerException success) {}
256	–	}
257	–
258	–	/**
175		* all elements successfully put are contained
176		*/
177		public void testPut() {
178		LinkedTransferQueue<Integer> q = new LinkedTransferQueue<Integer>();
179		for (int i = 0; i < SIZE; ++i) {
180	<	assertEquals(q.size(), i);
180	>	assertEquals(i, q.size());
181		q.put(i);
182		assertTrue(q.contains(i));
183		}
#	Line 281 | Line 197 | public class LinkedTransferQueueTest ext
197		* take removes existing elements until empty, then blocks interruptibly
198		*/
199		public void testBlockingTake() throws InterruptedException {
200	<	final BlockingQueue<Integer> q = populatedQueue(SIZE);
201	<	final CountDownLatch aboutToWait = new CountDownLatch(1);
200	>	final BlockingQueue q = populatedQueue(SIZE);
201	>	final CountDownLatch pleaseInterrupt = new CountDownLatch(1);
202		Thread t = newStartedThread(new CheckedRunnable() {
203		public void realRun() throws InterruptedException {
204		for (int i = 0; i < SIZE; ++i) {
205	<	assertEquals(i, (int) q.take());
205	>	assertEquals(i, q.take());
206		}
207	<	aboutToWait.countDown();
207	>
208	>	Thread.currentThread().interrupt();
209	>	try {
210	>	q.take();
211	>	shouldThrow();
212	>	} catch (InterruptedException success) {}
213	>	assertFalse(Thread.interrupted());
214	>
215	>	pleaseInterrupt.countDown();
216		try {
217		q.take();
218		shouldThrow();
219		} catch (InterruptedException success) {}
220	+	assertFalse(Thread.interrupted());
221		}});
222
223	<	aboutToWait.await();
224	<	waitForThreadToEnterWaitState(t, SMALL_DELAY_MS);
223	>	await(pleaseInterrupt);
224	>	assertThreadStaysAlive(t);
225		t.interrupt();
226	<	awaitTermination(t, MEDIUM_DELAY_MS);
302	<	checkEmpty(q);
226	>	awaitTermination(t);
227		}
228
229		/**
#	Line 332 | Line 256 | public class LinkedTransferQueueTest ext
256		public void testTimedPoll() throws InterruptedException {
257		LinkedTransferQueue<Integer> q = populatedQueue(SIZE);
258		for (int i = 0; i < SIZE; ++i) {
259	<	long t0 = System.nanoTime();
260	<	assertEquals(i, (int) q.poll(SMALL_DELAY_MS, MILLISECONDS));
261	<	assertTrue(millisElapsedSince(t0) < SMALL_DELAY_MS);
262	<	}
263	<	long t0 = System.nanoTime();
264	<	assertNull(q.poll(SHORT_DELAY_MS, MILLISECONDS));
265	<	assertTrue(millisElapsedSince(t0) >= SHORT_DELAY_MS);
259	>	long startTime = System.nanoTime();
260	>	assertEquals(i, (int) q.poll(LONG_DELAY_MS, MILLISECONDS));
261	>	assertTrue(millisElapsedSince(startTime) < LONG_DELAY_MS);
262	>	}
263	>	long startTime = System.nanoTime();
264	>	assertNull(q.poll(timeoutMillis(), MILLISECONDS));
265	>	assertTrue(millisElapsedSince(startTime) >= timeoutMillis());
266		checkEmpty(q);
267		}
268
#	Line 444 | Line 368 | public class LinkedTransferQueueTest ext
368		}
369
370		/**
447	–	* remove(x) removes x and returns true if present
448	–	*/
449	–	public void testRemoveElement() throws InterruptedException {
450	–	LinkedTransferQueue q = populatedQueue(SIZE);
451	–	for (int i = 1; i < SIZE; i += 2) {
452	–	assertTrue(q.remove(i));
453	–	}
454	–	for (int i = 0; i < SIZE; i += 2) {
455	–	assertTrue(q.remove(i));
456	–	assertFalse(q.remove(i + 1));
457	–	}
458	–	checkEmpty(q);
459	–	}
460	–
461	–	/**
371		* An add following remove(x) succeeds
372		*/
373		public void testRemoveElementAndAdd() throws InterruptedException {
#	Line 566 | Line 475 | public class LinkedTransferQueueTest ext
475		public void testToArray2() {
476		LinkedTransferQueue<Integer> q = populatedQueue(SIZE);
477		Integer[] ints = new Integer[SIZE];
478	<	assertSame(ints, q.toArray(ints));
478	>	Integer[] array = q.toArray(ints);
479	>	assertSame(ints, array);
480		for (int i = 0; i < ints.length; i++) {
481		assertSame(ints[i], q.poll());
482		}
483		}
484
485		/**
576	–	* toArray(null) throws NullPointerException
577	–	*/
578	–	public void testToArray_NullArg() {
579	–	LinkedTransferQueue q = populatedQueue(SIZE);
580	–	try {
581	–	q.toArray(null);
582	–	shouldThrow();
583	–	} catch (NullPointerException success) {}
584	–	}
585	–
586	–	/**
486		* toArray(incompatible array type) throws ArrayStoreException
487		*/
488		public void testToArray1_BadArg() {
#	Line 666 | Line 565 | public class LinkedTransferQueueTest ext
565		LinkedTransferQueue q = populatedQueue(SIZE);
566		String s = q.toString();
567		for (int i = 0; i < SIZE; ++i) {
568	<	assertTrue(s.indexOf(String.valueOf(i)) >= 0);
568	>	assertTrue(s.contains(String.valueOf(i)));
569		}
570		}
571
#	Line 675 | Line 574 | public class LinkedTransferQueueTest ext
574		*/
575		public void testOfferInExecutor() {
576		final LinkedTransferQueue q = new LinkedTransferQueue();
577	<	final CountDownLatch threadsStarted = new CountDownLatch(2);
577	>	final CheckedBarrier threadsStarted = new CheckedBarrier(2);
578		ExecutorService executor = Executors.newFixedThreadPool(2);
579
580		executor.execute(new CheckedRunnable() {
581		public void realRun() throws InterruptedException {
683	–	threadsStarted.countDown();
582		threadsStarted.await();
583	<	assertTrue(q.offer(one, MEDIUM_DELAY_MS, MILLISECONDS));
583	>	assertTrue(q.offer(one, LONG_DELAY_MS, MILLISECONDS));
584		}});
585
586		executor.execute(new CheckedRunnable() {
587		public void realRun() throws InterruptedException {
690	–	threadsStarted.countDown();
588		threadsStarted.await();
589		assertSame(one, q.take());
590		checkEmpty(q);
#	Line 701 | Line 598 | public class LinkedTransferQueueTest ext
598		*/
599		public void testPollInExecutor() {
600		final LinkedTransferQueue q = new LinkedTransferQueue();
601	<	final CountDownLatch threadsStarted = new CountDownLatch(2);
601	>	final CheckedBarrier threadsStarted = new CheckedBarrier(2);
602		ExecutorService executor = Executors.newFixedThreadPool(2);
603
604		executor.execute(new CheckedRunnable() {
605		public void realRun() throws InterruptedException {
606		assertNull(q.poll());
710	–	threadsStarted.countDown();
607		threadsStarted.await();
608	<	assertSame(one, q.poll(SMALL_DELAY_MS, MILLISECONDS));
608	>	assertSame(one, q.poll(LONG_DELAY_MS, MILLISECONDS));
609		checkEmpty(q);
610		}});
611
612		executor.execute(new CheckedRunnable() {
613		public void realRun() throws InterruptedException {
718	–	threadsStarted.countDown();
614		threadsStarted.await();
615		q.put(one);
616		}});
#	Line 727 | Line 622 | public class LinkedTransferQueueTest ext
622		* A deserialized serialized queue has same elements in same order
623		*/
624		public void testSerialization() throws Exception {
625	<	LinkedTransferQueue q = populatedQueue(SIZE);
626	<
732	<	ByteArrayOutputStream bout = new ByteArrayOutputStream(10000);
733	<	ObjectOutputStream out
734	<	= new ObjectOutputStream(new BufferedOutputStream(bout));
735	<	out.writeObject(q);
736	<	out.close();
737	<
738	<	ByteArrayInputStream bin
739	<	= new ByteArrayInputStream(bout.toByteArray());
740	<	ObjectInputStream in
741	<	= new ObjectInputStream(new BufferedInputStream(bin));
742	<	LinkedTransferQueue r = (LinkedTransferQueue) in.readObject();
625	>	Queue x = populatedQueue(SIZE);
626	>	Queue y = serialClone(x);
627
628	<	assertEquals(q.size(), r.size());
629	<	assertEquals(q.toString(), r.toString());
630	<	assertTrue(Arrays.equals(q.toArray(), r.toArray()));
631	<	while (!q.isEmpty()) {
632	<	assertEquals(q.remove(), r.remove());
628	>	assertNotSame(y, x);
629	>	assertEquals(x.size(), y.size());
630	>	assertEquals(x.toString(), y.toString());
631	>	assertTrue(Arrays.equals(x.toArray(), y.toArray()));
632	>	while (!x.isEmpty()) {
633	>	assertFalse(y.isEmpty());
634	>	assertEquals(x.remove(), y.remove());
635		}
636	<	}
751	<
752	<	/**
753	<	* drainTo(null) throws NullPointerException
754	<	*/
755	<	public void testDrainToNull() {
756	<	LinkedTransferQueue q = populatedQueue(SIZE);
757	<	try {
758	<	q.drainTo(null);
759	<	shouldThrow();
760	<	} catch (NullPointerException success) {}
761	<	}
762	<
763	<	/**
764	<	* drainTo(this) throws IllegalArgumentException
765	<	*/
766	<	public void testDrainToSelf() {
767	<	LinkedTransferQueue q = populatedQueue(SIZE);
768	<	try {
769	<	q.drainTo(q);
770	<	shouldThrow();
771	<	} catch (IllegalArgumentException success) {}
636	>	assertTrue(y.isEmpty());
637		}
638
639		/**
#	Line 778 | Line 643 | public class LinkedTransferQueueTest ext
643		LinkedTransferQueue q = populatedQueue(SIZE);
644		ArrayList l = new ArrayList();
645		q.drainTo(l);
646	<	assertEquals(q.size(), 0);
647	<	assertEquals(l.size(), SIZE);
646	>	assertEquals(0, q.size());
647	>	assertEquals(SIZE, l.size());
648		for (int i = 0; i < SIZE; ++i) {
649	<	assertEquals(l.get(i), i);
649	>	assertEquals(i, l.get(i));
650		}
651		q.add(zero);
652		q.add(one);
#	Line 790 | Line 655 | public class LinkedTransferQueueTest ext
655		assertTrue(q.contains(one));
656		l.clear();
657		q.drainTo(l);
658	<	assertEquals(q.size(), 0);
659	<	assertEquals(l.size(), 2);
658	>	assertEquals(0, q.size());
659	>	assertEquals(2, l.size());
660		for (int i = 0; i < 2; ++i) {
661	<	assertEquals(l.get(i), i);
661	>	assertEquals(i, l.get(i));
662		}
663		}
664
#	Line 809 | Line 674 | public class LinkedTransferQueueTest ext
674		ArrayList l = new ArrayList();
675		q.drainTo(l);
676		assertTrue(l.size() >= SIZE);
677	<	for (int i = 0; i < SIZE; ++i) {
678	<	assertEquals(l.get(i), i);
814	<	}
677	>	for (int i = 0; i < SIZE; ++i)
678	>	assertEquals(i, l.get(i));
679		awaitTermination(t, MEDIUM_DELAY_MS);
680		assertTrue(q.size() + l.size() >= SIZE);
681		}
682
683		/**
820	–	* drainTo(null, n) throws NullPointerException
821	–	*/
822	–	public void testDrainToNullN() {
823	–	LinkedTransferQueue q = populatedQueue(SIZE);
824	–	try {
825	–	q.drainTo(null, SIZE);
826	–	shouldThrow();
827	–	} catch (NullPointerException success) {}
828	–	}
829	–
830	–	/**
831	–	* drainTo(this, n) throws IllegalArgumentException
832	–	*/
833	–	public void testDrainToSelfN() {
834	–	LinkedTransferQueue q = populatedQueue(SIZE);
835	–	try {
836	–	q.drainTo(q, SIZE);
837	–	shouldThrow();
838	–	} catch (IllegalArgumentException success) {}
839	–	}
840	–
841	–	/**
684		* drainTo(c, n) empties first min(n, size) elements of queue into c
685		*/
686		public void testDrainToN() {
#	Line 850 | Line 692 | public class LinkedTransferQueueTest ext
692		ArrayList l = new ArrayList();
693		q.drainTo(l, i);
694		int k = (i < SIZE) ? i : SIZE;
695	<	assertEquals(l.size(), k);
696	<	assertEquals(q.size(), SIZE - k);
697	<	for (int j = 0; j < k; ++j) {
698	<	assertEquals(l.get(j), j);
857	<	}
695	>	assertEquals(k, l.size());
696	>	assertEquals(SIZE - k, q.size());
697	>	for (int j = 0; j < k; ++j)
698	>	assertEquals(j, l.get(j));
699		while (q.poll() != null)
700		;
701		}
#	Line 866 | Line 707 | public class LinkedTransferQueueTest ext
707		*/
708		public void testWaitingConsumer() throws InterruptedException {
709		final LinkedTransferQueue q = new LinkedTransferQueue();
710	<	assertEquals(q.getWaitingConsumerCount(), 0);
710	>	assertEquals(0, q.getWaitingConsumerCount());
711		assertFalse(q.hasWaitingConsumer());
712		final CountDownLatch threadStarted = new CountDownLatch(1);
713
#	Line 874 | Line 715 | public class LinkedTransferQueueTest ext
715		public void realRun() throws InterruptedException {
716		threadStarted.countDown();
717		assertSame(one, q.poll(LONG_DELAY_MS, MILLISECONDS));
718	<	assertEquals(q.getWaitingConsumerCount(), 0);
718	>	assertEquals(0, q.getWaitingConsumerCount());
719		assertFalse(q.hasWaitingConsumer());
720		}});
721
722		threadStarted.await();
723		waitForThreadToEnterWaitState(t, SMALL_DELAY_MS);
724	<	assertEquals(q.getWaitingConsumerCount(), 1);
724	>	assertEquals(1, q.getWaitingConsumerCount());
725		assertTrue(q.hasWaitingConsumer());
726
727		assertTrue(q.offer(one));
728	<	assertEquals(q.getWaitingConsumerCount(), 0);
728	>	assertEquals(0, q.getWaitingConsumerCount());
729		assertFalse(q.hasWaitingConsumer());
730
731		awaitTermination(t, MEDIUM_DELAY_MS);
#	Line 1071 | Line 912 | public class LinkedTransferQueueTest ext
912		}
913
914		/**
915	<	* tryTransfer waits the amount given if interrupted, and
1075	<	* throws interrupted exception
915	>	* tryTransfer blocks interruptibly if no takers
916		*/
917		public void testTryTransfer5() throws InterruptedException {
918		final LinkedTransferQueue q = new LinkedTransferQueue();
919	<	final CountDownLatch threadStarted = new CountDownLatch(1);
919	>	final CountDownLatch pleaseInterrupt = new CountDownLatch(1);
920	>	assertTrue(q.isEmpty());
921
922		Thread t = newStartedThread(new CheckedRunnable() {
923		public void realRun() throws InterruptedException {
924	<	long t0 = System.nanoTime();
925	<	threadStarted.countDown();
924	>	Thread.currentThread().interrupt();
925	>	try {
926	>	q.tryTransfer(new Object(), LONG_DELAY_MS, MILLISECONDS);
927	>	shouldThrow();
928	>	} catch (InterruptedException success) {}
929	>	assertFalse(Thread.interrupted());
930	>
931	>	pleaseInterrupt.countDown();
932		try {
933		q.tryTransfer(new Object(), LONG_DELAY_MS, MILLISECONDS);
934		shouldThrow();
935		} catch (InterruptedException success) {}
936	<	assertTrue(millisElapsedSince(t0) >= SHORT_DELAY_MS);
936	>	assertFalse(Thread.interrupted());
937		}});
938
939	<	threadStarted.await();
940	<	Thread.sleep(SHORT_DELAY_MS);
939	>	await(pleaseInterrupt);
940	>	assertThreadStaysAlive(t);
941		t.interrupt();
942	<	awaitTermination(t, MEDIUM_DELAY_MS);
942	>	awaitTermination(t);
943		checkEmpty(q);
944		}
945
#	Line 1106 | Line 953 | public class LinkedTransferQueueTest ext
953		public void realRun() throws InterruptedException {
954		long t0 = System.nanoTime();
955		assertFalse(q.tryTransfer(new Object(),
956	<	SHORT_DELAY_MS, MILLISECONDS));
957	<	assertTrue(millisElapsedSince(t0) >= SHORT_DELAY_MS);
956	>	timeoutMillis(), MILLISECONDS));
957	>	assertTrue(millisElapsedSince(t0) >= timeoutMillis());
958		checkEmpty(q);
959		}});
960
961	<	awaitTermination(t, MEDIUM_DELAY_MS);
961	>	awaitTermination(t);
962		checkEmpty(q);
963		}
964
#	Line 1139 | Line 986 | public class LinkedTransferQueueTest ext
986		}
987
988		/**
989	<	* tryTransfer attempts to enqueue into the q and fails returning
990	<	* false not enqueueing and the successive poll is null
989	>	* tryTransfer attempts to enqueue into the queue and fails
990	>	* returning false not enqueueing and the successive poll is null
991		*/
992		public void testTryTransfer8() throws InterruptedException {
993		final LinkedTransferQueue q = new LinkedTransferQueue();
994		assertTrue(q.offer(four));
995		assertEquals(1, q.size());
996		long t0 = System.nanoTime();
997	<	assertFalse(q.tryTransfer(five, SHORT_DELAY_MS, MILLISECONDS));
998	<	assertTrue(millisElapsedSince(t0) >= SHORT_DELAY_MS);
997	>	assertFalse(q.tryTransfer(five, timeoutMillis(), MILLISECONDS));
998	>	assertTrue(millisElapsedSince(t0) >= timeoutMillis());
999		assertEquals(1, q.size());
1000		assertSame(four, q.poll());
1001		assertNull(q.poll());
#	Line 1166 | Line 1013 | public class LinkedTransferQueueTest ext
1013		assertFalse(q.isEmpty());
1014		return q;
1015		}
1016	+
1017	+	/**
1018	+	* remove(null), contains(null) always return false
1019	+	*/
1020	+	public void testNeverContainsNull() {
1021	+	Collection<?>[] qs = {
1022	+	new LinkedTransferQueue<Object>(),
1023	+	populatedQueue(2),
1024	+	};
1025	+
1026	+	for (Collection<?> q : qs) {
1027	+	assertFalse(q.contains(null));
1028	+	assertFalse(q.remove(null));
1029	+	}
1030	+	}
1031		}

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