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

Comparing jsr166/src/test/tck/LinkedBlockingQueueTest.java (file contents):
Revision 1.5 by dl, Thu Sep 25 11:02:41 2003 UTC vs.
Revision 1.76 by jsr166, Fri Aug 4 03:30:21 2017 UTC

#	Line 1 | Line 1
1		/*
2	<	* Written by members of JCP JSR-166 Expert Group and released to the
3	<	* public domain. Use, modify, and redistribute this code in any way
4	<	* without acknowledgement. Other contributors include Andrew Wright,
5	<	* Jeffrey Hayes, Pat Fischer, Mike Judd.
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/publicdomain/zero/1.0/
5	>	* Other contributors include Andrew Wright, Jeffrey Hayes,
6	>	* Pat Fisher, Mike Judd.
7		*/
8
9	<	import junit.framework.*;
10	<	import java.util.*;
11	<	import java.util.concurrent.*;
12	<	import java.io.*;
9	>	import static java.util.concurrent.TimeUnit.MILLISECONDS;
10	>
11	>	import java.util.ArrayList;
12	>	import java.util.Arrays;
13	>	import java.util.Collection;
14	>	import java.util.Iterator;
15	>	import java.util.NoSuchElementException;
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.LinkedBlockingQueue;
22	>
23	>	import junit.framework.Test;
24
25		public class LinkedBlockingQueueTest extends JSR166TestCase {
26
27	+	public static class Unbounded extends BlockingQueueTest {
28	+	protected BlockingQueue emptyCollection() {
29	+	return new LinkedBlockingQueue();
30	+	}
31	+	}
32	+
33	+	public static class Bounded extends BlockingQueueTest {
34	+	protected BlockingQueue emptyCollection() {
35	+	return new LinkedBlockingQueue(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	<	return new TestSuite(LinkedBlockingQueueTest.class);
44	>	class Implementation implements CollectionImplementation {
45	>	public Class<?> klazz() { return LinkedBlockingQueue.class; }
46	>	public Collection emptyCollection() { return new LinkedBlockingQueue(); }
47	>	public Object makeElement(int i) { return i; }
48	>	public boolean isConcurrent() { return true; }
49	>	public boolean permitsNulls() { return false; }
50	>	}
51	>	return newTestSuite(LinkedBlockingQueueTest.class,
52	>	new Unbounded().testSuite(),
53	>	new Bounded().testSuite(),
54	>	CollectionTest.testSuite(new Implementation()));
55		}
56
23	–
57		/**
58	<	* Create a queue of given size containing consecutive
59	<	* Integers 0 ... n.
60	<	*/
61	<	private LinkedBlockingQueue populatedQueue(int n) {
62	<	LinkedBlockingQueue q = new LinkedBlockingQueue(n);
58	>	* Returns a new queue of given size containing consecutive
59	>	* Integers 0 ... n - 1.
60	>	*/
61	>	private static LinkedBlockingQueue<Integer> populatedQueue(int n) {
62	>	LinkedBlockingQueue<Integer> q =
63	>	new LinkedBlockingQueue<Integer>(n);
64		assertTrue(q.isEmpty());
65	<	for(int i = 0; i < n; i++)
66	<	assertTrue(q.offer(new Integer(i)));
65	>	for (int i = 0; i < n; i++)
66	>	assertTrue(q.offer(new Integer(i)));
67		assertFalse(q.isEmpty());
68		assertEquals(0, q.remainingCapacity());
69	<	assertEquals(n, q.size());
69	>	assertEquals(n, q.size());
70	>	assertEquals((Integer) 0, q.peek());
71		return q;
72		}
73	<
73	>
74		/**
75		* A new queue has the indicated capacity, or Integer.MAX_VALUE if
76		* none given
#	Line 46 | Line 81 | public class LinkedBlockingQueueTest ext
81		}
82
83		/**
84	<	* Constructor throws IAE if  capacity argument nonpositive
84	>	* Constructor throws IllegalArgumentException if capacity argument nonpositive
85		*/
86		public void testConstructor2() {
87		try {
88	<	LinkedBlockingQueue q = new LinkedBlockingQueue(0);
88	>	new LinkedBlockingQueue(0);
89		shouldThrow();
90	<	}
56	<	catch (IllegalArgumentException success) {}
90	>	} catch (IllegalArgumentException success) {}
91		}
92
93		/**
94	<	* Initializing from null Collection throws NPE
94	>	* Initializing from null Collection throws NullPointerException
95		*/
96		public void testConstructor3() {
97		try {
98	<	LinkedBlockingQueue q = new LinkedBlockingQueue(null);
98	>	new LinkedBlockingQueue(null);
99		shouldThrow();
100	<	}
67	<	catch (NullPointerException success) {}
100	>	} catch (NullPointerException success) {}
101		}
102
103		/**
104	<	* Initializing from Collection of null elements throws NPE
104	>	* Initializing from Collection of null elements throws NullPointerException
105		*/
106		public void testConstructor4() {
107	+	Collection<Integer> elements = Arrays.asList(new Integer[SIZE]);
108		try {
109	<	Integer[] ints = new Integer[SIZE];
76	<	LinkedBlockingQueue q = new LinkedBlockingQueue(Arrays.asList(ints));
109	>	new LinkedBlockingQueue(elements);
110		shouldThrow();
111	<	}
79	<	catch (NullPointerException success) {}
111	>	} catch (NullPointerException success) {}
112		}
113
114		/**
115	<	* Initializing from Collection with some null elements throws NPE
115	>	* Initializing from Collection with some null elements throws
116	>	* NullPointerException
117		*/
118		public void testConstructor5() {
119	+	Integer[] ints = new Integer[SIZE];
120	+	for (int i = 0; i < SIZE - 1; ++i)
121	+	ints[i] = new Integer(i);
122	+	Collection<Integer> elements = Arrays.asList(ints);
123		try {
124	<	Integer[] ints = new Integer[SIZE];
88	<	for (int i = 0; i < SIZE-1; ++i)
89	<	ints[i] = new Integer(i);
90	<	LinkedBlockingQueue q = new LinkedBlockingQueue(Arrays.asList(ints));
124	>	new LinkedBlockingQueue(elements);
125		shouldThrow();
126	<	}
93	<	catch (NullPointerException success) {}
126	>	} catch (NullPointerException success) {}
127		}
128
129		/**
130		* Queue contains all elements of collection used to initialize
131		*/
132		public void testConstructor6() {
133	<	try {
134	<	Integer[] ints = new Integer[SIZE];
135	<	for (int i = 0; i < SIZE; ++i)
136	<	ints[i] = new Integer(i);
137	<	LinkedBlockingQueue q = new LinkedBlockingQueue(Arrays.asList(ints));
138	<	for (int i = 0; i < SIZE; ++i)
106	<	assertEquals(ints[i], q.poll());
107	<	}
108	<	finally {}
133	>	Integer[] ints = new Integer[SIZE];
134	>	for (int i = 0; i < SIZE; ++i)
135	>	ints[i] = new Integer(i);
136	>	LinkedBlockingQueue q = new LinkedBlockingQueue(Arrays.asList(ints));
137	>	for (int i = 0; i < SIZE; ++i)
138	>	assertEquals(ints[i], q.poll());
139		}
140
141		/**
#	Line 127 | Line 157 | public class LinkedBlockingQueueTest ext
157		* remainingCapacity decreases on add, increases on remove
158		*/
159		public void testRemainingCapacity() {
160	<	LinkedBlockingQueue q = populatedQueue(SIZE);
160	>	BlockingQueue q = populatedQueue(SIZE);
161		for (int i = 0; i < SIZE; ++i) {
162		assertEquals(i, q.remainingCapacity());
163	<	assertEquals(SIZE-i, q.size());
164	<	q.remove();
163	>	assertEquals(SIZE, q.size() + q.remainingCapacity());
164	>	assertEquals(i, q.remove());
165		}
166		for (int i = 0; i < SIZE; ++i) {
167	<	assertEquals(SIZE-i, q.remainingCapacity());
168	<	assertEquals(i, q.size());
169	<	q.add(new Integer(i));
167	>	assertEquals(SIZE - i, q.remainingCapacity());
168	>	assertEquals(SIZE, q.size() + q.remainingCapacity());
169	>	assertTrue(q.add(i));
170		}
171		}
172
173		/**
144	–	* offer(null) throws NPE
145	–	*/
146	–	public void testOfferNull() {
147	–	try {
148	–	LinkedBlockingQueue q = new LinkedBlockingQueue(1);
149	–	q.offer(null);
150	–	shouldThrow();
151	–	} catch (NullPointerException success) { }
152	–	}
153	–
154	–	/**
174		* Offer succeeds if not full; fails if full
175		*/
176		public void testOffer() {
#	Line 161 | Line 180 | public class LinkedBlockingQueueTest ext
180		}
181
182		/**
183	<	* add succeeds if not full; throws ISE if full
183	>	* add succeeds if not full; throws IllegalStateException if full
184		*/
185		public void testAdd() {
186	<	try {
187	<	LinkedBlockingQueue q = new LinkedBlockingQueue(SIZE);
188	<	for (int i = 0; i < SIZE; ++i) {
189	<	assertTrue(q.add(new Integer(i)));
190	<	}
172	<	assertEquals(0, q.remainingCapacity());
186	>	LinkedBlockingQueue q = new LinkedBlockingQueue(SIZE);
187	>	for (int i = 0; i < SIZE; ++i)
188	>	assertTrue(q.add(new Integer(i)));
189	>	assertEquals(0, q.remainingCapacity());
190	>	try {
191		q.add(new Integer(SIZE));
192	<	} catch (IllegalStateException success){
193	<	}
192	>	shouldThrow();
193	>	} catch (IllegalStateException success) {}
194		}
195
196		/**
197	<	* addAll(null) throws NPE
197	>	* addAll(this) throws IllegalArgumentException
198		*/
199	<	public void testAddAll1() {
199	>	public void testAddAllSelf() {
200	>	LinkedBlockingQueue q = populatedQueue(SIZE);
201		try {
202	<	LinkedBlockingQueue q = new LinkedBlockingQueue(1);
184	<	q.addAll(null);
202	>	q.addAll(q);
203		shouldThrow();
204	<	}
187	<	catch (NullPointerException success) {}
188	<	}
189	<	/**
190	<	* addAll of a collection with null elements throws NPE
191	<	*/
192	<	public void testAddAll2() {
193	<	try {
194	<	LinkedBlockingQueue q = new LinkedBlockingQueue(SIZE);
195	<	Integer[] ints = new Integer[SIZE];
196	<	q.addAll(Arrays.asList(ints));
197	<	shouldThrow();
198	<	}
199	<	catch (NullPointerException success) {}
204	>	} catch (IllegalArgumentException success) {}
205		}
206	+
207		/**
208		* addAll of a collection with any null elements throws NPE after
209		* possibly adding some elements
210		*/
211		public void testAddAll3() {
212	+	LinkedBlockingQueue q = new LinkedBlockingQueue(SIZE);
213	+	Integer[] ints = new Integer[SIZE];
214	+	for (int i = 0; i < SIZE - 1; ++i)
215	+	ints[i] = new Integer(i);
216	+	Collection<Integer> elements = Arrays.asList(ints);
217		try {
218	<	LinkedBlockingQueue q = new LinkedBlockingQueue(SIZE);
208	<	Integer[] ints = new Integer[SIZE];
209	<	for (int i = 0; i < SIZE-1; ++i)
210	<	ints[i] = new Integer(i);
211	<	q.addAll(Arrays.asList(ints));
218	>	q.addAll(elements);
219		shouldThrow();
220	<	}
214	<	catch (NullPointerException success) {}
220	>	} catch (NullPointerException success) {}
221		}
222	+
223		/**
224	<	* addAll throws ISE if not enough room
224	>	* addAll throws IllegalStateException if not enough room
225		*/
226		public void testAddAll4() {
227	+	LinkedBlockingQueue q = new LinkedBlockingQueue(SIZE - 1);
228	+	Integer[] ints = new Integer[SIZE];
229	+	for (int i = 0; i < SIZE; ++i)
230	+	ints[i] = new Integer(i);
231	+	Collection<Integer> elements = Arrays.asList(ints);
232		try {
233	<	LinkedBlockingQueue q = new LinkedBlockingQueue(1);
222	<	Integer[] ints = new Integer[SIZE];
223	<	for (int i = 0; i < SIZE; ++i)
224	<	ints[i] = new Integer(i);
225	<	q.addAll(Arrays.asList(ints));
233	>	q.addAll(elements);
234		shouldThrow();
235	<	}
228	<	catch (IllegalStateException success) {}
235	>	} catch (IllegalStateException success) {}
236		}
237	+
238		/**
239		* Queue contains all elements, in traversal order, of successful addAll
240		*/
241		public void testAddAll5() {
242	<	try {
243	<	Integer[] empty = new Integer[0];
244	<	Integer[] ints = new Integer[SIZE];
245	<	for (int i = 0; i < SIZE; ++i)
246	<	ints[i] = new Integer(i);
247	<	LinkedBlockingQueue q = new LinkedBlockingQueue(SIZE);
248	<	assertFalse(q.addAll(Arrays.asList(empty)));
249	<	assertTrue(q.addAll(Arrays.asList(ints)));
250	<	for (int i = 0; i < SIZE; ++i)
243	<	assertEquals(ints[i], q.poll());
244	<	}
245	<	finally {}
242	>	Integer[] empty = new Integer[0];
243	>	Integer[] ints = new Integer[SIZE];
244	>	for (int i = 0; i < SIZE; ++i)
245	>	ints[i] = new Integer(i);
246	>	LinkedBlockingQueue q = new LinkedBlockingQueue(SIZE);
247	>	assertFalse(q.addAll(Arrays.asList(empty)));
248	>	assertTrue(q.addAll(Arrays.asList(ints)));
249	>	for (int i = 0; i < SIZE; ++i)
250	>	assertEquals(ints[i], q.poll());
251		}
252
253		/**
249	–	* put(null) throws NPE
250	–	*/
251	–	public void testPutNull() {
252	–	try {
253	–	LinkedBlockingQueue q = new LinkedBlockingQueue(SIZE);
254	–	q.put(null);
255	–	shouldThrow();
256	–	}
257	–	catch (NullPointerException success){
258	–	}
259	–	catch (InterruptedException ie) {
260	–	unexpectedException();
261	–	}
262	–	}
263	–
264	–	/**
254		* all elements successfully put are contained
255		*/
256	<	public void testPut() {
257	<	try {
258	<	LinkedBlockingQueue q = new LinkedBlockingQueue(SIZE);
259	<	for (int i = 0; i < SIZE; ++i) {
260	<	Integer I = new Integer(i);
261	<	q.put(I);
273	<	assertTrue(q.contains(I));
274	<	}
275	<	assertEquals(0, q.remainingCapacity());
276	<	}
277	<	catch (InterruptedException ie) {
278	<	unexpectedException();
256	>	public void testPut() throws InterruptedException {
257	>	LinkedBlockingQueue q = new LinkedBlockingQueue(SIZE);
258	>	for (int i = 0; i < SIZE; ++i) {
259	>	Integer x = new Integer(i);
260	>	q.put(x);
261	>	assertTrue(q.contains(x));
262		}
263	+	assertEquals(0, q.remainingCapacity());
264		}
265
266		/**
267		* put blocks interruptibly if full
268		*/
269	<	public void testBlockingPut() {
270	<	Thread t = new Thread(new Runnable() {
271	<	public void run() {
272	<	int added = 0;
273	<	try {
274	<	LinkedBlockingQueue q = new LinkedBlockingQueue(SIZE);
275	<	for (int i = 0; i < SIZE; ++i) {
276	<	q.put(new Integer(i));
277	<	++added;
278	<	}
279	<	q.put(new Integer(SIZE));
280	<	threadShouldThrow();
281	<	} catch (InterruptedException ie){
282	<	threadAssertEquals(added, SIZE);
283	<	}
284	<	}});
285	<	t.start();
286	<	try {
287	<	Thread.sleep(SHORT_DELAY_MS);
288	<	t.interrupt();
289	<	t.join();
290	<	}
291	<	catch (InterruptedException ie) {
292	<	unexpectedException();
293	<	}
269	>	public void testBlockingPut() throws InterruptedException {
270	>	final LinkedBlockingQueue q = new LinkedBlockingQueue(SIZE);
271	>	final CountDownLatch pleaseInterrupt = new CountDownLatch(1);
272	>	Thread t = newStartedThread(new CheckedRunnable() {
273	>	public void realRun() throws InterruptedException {
274	>	for (int i = 0; i < SIZE; ++i)
275	>	q.put(i);
276	>	assertEquals(SIZE, q.size());
277	>	assertEquals(0, q.remainingCapacity());
278	>
279	>	Thread.currentThread().interrupt();
280	>	try {
281	>	q.put(99);
282	>	shouldThrow();
283	>	} catch (InterruptedException success) {}
284	>	assertFalse(Thread.interrupted());
285	>
286	>	pleaseInterrupt.countDown();
287	>	try {
288	>	q.put(99);
289	>	shouldThrow();
290	>	} catch (InterruptedException success) {}
291	>	assertFalse(Thread.interrupted());
292	>	}});
293	>
294	>	await(pleaseInterrupt);
295	>	assertThreadBlocks(t, Thread.State.WAITING);
296	>	t.interrupt();
297	>	awaitTermination(t);
298	>	assertEquals(SIZE, q.size());
299	>	assertEquals(0, q.remainingCapacity());
300		}
301
302		/**
303	<	* put blocks waiting for take when full
303	>	* put blocks interruptibly waiting for take when full
304		*/
305	<	public void testPutWithTake() {
305	>	public void testPutWithTake() throws InterruptedException {
306	>	final int capacity = 2;
307		final LinkedBlockingQueue q = new LinkedBlockingQueue(2);
308	<	Thread t = new Thread(new Runnable() {
309	<	public void run() {
310	<	int added = 0;
311	<	try {
312	<	q.put(new Object());
313	<	++added;
314	<	q.put(new Object());
315	<	++added;
316	<	q.put(new Object());
317	<	++added;
318	<	q.put(new Object());
319	<	++added;
320	<	threadShouldThrow();
321	<	} catch (InterruptedException e){
322	<	threadAssertTrue(added >= 2);
323	<	}
324	<	}
325	<	});
326	<	try {
327	<	t.start();
328	<	Thread.sleep(SHORT_DELAY_MS);
329	<	q.take();
330	<	t.interrupt();
331	<	t.join();
332	<	} catch (Exception e){
333	<	unexpectedException();
334	<	}
308	>	final CountDownLatch pleaseTake = new CountDownLatch(1);
309	>	final CountDownLatch pleaseInterrupt = new CountDownLatch(1);
310	>	Thread t = newStartedThread(new CheckedRunnable() {
311	>	public void realRun() throws InterruptedException {
312	>	for (int i = 0; i < capacity; i++)
313	>	q.put(i);
314	>	pleaseTake.countDown();
315	>	q.put(86);
316	>
317	>	Thread.currentThread().interrupt();
318	>	try {
319	>	q.put(99);
320	>	shouldThrow();
321	>	} catch (InterruptedException success) {}
322	>	assertFalse(Thread.interrupted());
323	>
324	>	pleaseInterrupt.countDown();
325	>	try {
326	>	q.put(99);
327	>	shouldThrow();
328	>	} catch (InterruptedException success) {}
329	>	assertFalse(Thread.interrupted());
330	>	}});
331	>
332	>	await(pleaseTake);
333	>	assertEquals(0, q.remainingCapacity());
334	>	assertEquals(0, q.take());
335	>
336	>	await(pleaseInterrupt);
337	>	assertThreadBlocks(t, Thread.State.WAITING);
338	>	t.interrupt();
339	>	awaitTermination(t);
340	>	assertEquals(0, q.remainingCapacity());
341		}
342
343		/**
#	Line 348 | Line 345 | public class LinkedBlockingQueueTest ext
345		*/
346		public void testTimedOffer() {
347		final LinkedBlockingQueue q = new LinkedBlockingQueue(2);
348	<	Thread t = new Thread(new Runnable() {
349	<	public void run() {
350	<	try {
351	<	q.put(new Object());
352	<	q.put(new Object());
353	<	threadAssertFalse(q.offer(new Object(), SHORT_DELAY_MS, TimeUnit.MILLISECONDS));
354	<	q.offer(new Object(), LONG_DELAY_MS, TimeUnit.MILLISECONDS);
355	<	threadShouldThrow();
356	<	} catch (InterruptedException success){}
360	<	}
361	<	});
362	<
363	<	try {
364	<	t.start();
365	<	Thread.sleep(SMALL_DELAY_MS);
366	<	t.interrupt();
367	<	t.join();
368	<	} catch (Exception e){
369	<	unexpectedException();
370	<	}
371	<	}
348	>	final CountDownLatch pleaseInterrupt = new CountDownLatch(1);
349	>	Thread t = newStartedThread(new CheckedRunnable() {
350	>	public void realRun() throws InterruptedException {
351	>	q.put(new Object());
352	>	q.put(new Object());
353	>
354	>	long startTime = System.nanoTime();
355	>	assertFalse(q.offer(new Object(), timeoutMillis(), MILLISECONDS));
356	>	assertTrue(millisElapsedSince(startTime) >= timeoutMillis());
357
358	<	/**
359	<	* take retrieves elements in FIFO order
360	<	*/
361	<	public void testTake() {
362	<	try {
363	<	LinkedBlockingQueue q = populatedQueue(SIZE);
364	<	for (int i = 0; i < SIZE; ++i) {
365	<	assertEquals(i, ((Integer)q.take()).intValue());
366	<	}
367	<	} catch (InterruptedException e){
368	<	unexpectedException();
369	<	}
358	>	Thread.currentThread().interrupt();
359	>	try {
360	>	q.offer(new Object(), 2 * LONG_DELAY_MS, MILLISECONDS);
361	>	shouldThrow();
362	>	} catch (InterruptedException success) {}
363	>	assertFalse(Thread.interrupted());
364	>
365	>	pleaseInterrupt.countDown();
366	>	try {
367	>	q.offer(new Object(), 2 * LONG_DELAY_MS, MILLISECONDS);
368	>	shouldThrow();
369	>	} catch (InterruptedException success) {}
370	>	assertFalse(Thread.interrupted());
371	>	}});
372	>
373	>	await(pleaseInterrupt);
374	>	assertThreadBlocks(t, Thread.State.TIMED_WAITING);
375	>	t.interrupt();
376	>	awaitTermination(t);
377		}
378
379		/**
380	<	* take blocks interruptibly when empty
380	>	* take retrieves elements in FIFO order
381		*/
382	<	public void testTakeFromEmpty() {
383	<	final LinkedBlockingQueue q = new LinkedBlockingQueue(2);
384	<	Thread t = new Thread(new Runnable() {
385	<	public void run() {
394	<	try {
395	<	q.take();
396	<	threadShouldThrow();
397	<	} catch (InterruptedException success){ }
398	<	}
399	<	});
400	<	try {
401	<	t.start();
402	<	Thread.sleep(SHORT_DELAY_MS);
403	<	t.interrupt();
404	<	t.join();
405	<	} catch (Exception e){
406	<	unexpectedException();
382	>	public void testTake() throws InterruptedException {
383	>	LinkedBlockingQueue q = populatedQueue(SIZE);
384	>	for (int i = 0; i < SIZE; ++i) {
385	>	assertEquals(i, q.take());
386		}
387		}
388
389		/**
390		* Take removes existing elements until empty, then blocks interruptibly
391		*/
392	<	public void testBlockingTake() {
393	<	Thread t = new Thread(new Runnable() {
394	<	public void run() {
395	<	try {
396	<	LinkedBlockingQueue q = populatedQueue(SIZE);
397	<	for (int i = 0; i < SIZE; ++i) {
419	<	assertEquals(i, ((Integer)q.take()).intValue());
420	<	}
421	<	q.take();
422	<	threadShouldThrow();
423	<	} catch (InterruptedException success){
424	<	}
425	<	}});
426	<	t.start();
427	<	try {
428	<	Thread.sleep(SHORT_DELAY_MS);
429	<	t.interrupt();
430	<	t.join();
431	<	}
432	<	catch (InterruptedException ie) {
433	<	unexpectedException();
434	<	}
435	<	}
392	>	public void testBlockingTake() throws InterruptedException {
393	>	final BlockingQueue q = populatedQueue(SIZE);
394	>	final CountDownLatch pleaseInterrupt = new CountDownLatch(1);
395	>	Thread t = newStartedThread(new CheckedRunnable() {
396	>	public void realRun() throws InterruptedException {
397	>	for (int i = 0; i < SIZE; i++) assertEquals(i, q.take());
398
399	+	Thread.currentThread().interrupt();
400	+	try {
401	+	q.take();
402	+	shouldThrow();
403	+	} catch (InterruptedException success) {}
404	+	assertFalse(Thread.interrupted());
405	+
406	+	pleaseInterrupt.countDown();
407	+	try {
408	+	q.take();
409	+	shouldThrow();
410	+	} catch (InterruptedException success) {}
411	+	assertFalse(Thread.interrupted());
412	+	}});
413	+
414	+	await(pleaseInterrupt);
415	+	assertThreadBlocks(t, Thread.State.WAITING);
416	+	t.interrupt();
417	+	awaitTermination(t);
418	+	}
419
420		/**
421		* poll succeeds unless empty
#	Line 441 | Line 423 | public class LinkedBlockingQueueTest ext
423		public void testPoll() {
424		LinkedBlockingQueue q = populatedQueue(SIZE);
425		for (int i = 0; i < SIZE; ++i) {
426	<	assertEquals(i, ((Integer)q.poll()).intValue());
426	>	assertEquals(i, q.poll());
427		}
428	<	assertNull(q.poll());
428	>	assertNull(q.poll());
429		}
430
431		/**
432	<	* timed pool with zero timeout succeeds when non-empty, else times out
432	>	* timed poll with zero timeout succeeds when non-empty, else times out
433		*/
434	<	public void testTimedPoll0() {
435	<	try {
436	<	LinkedBlockingQueue q = populatedQueue(SIZE);
437	<	for (int i = 0; i < SIZE; ++i) {
438	<	assertEquals(i, ((Integer)q.poll(0, TimeUnit.MILLISECONDS)).intValue());
439	<	}
458	<	assertNull(q.poll(0, TimeUnit.MILLISECONDS));
459	<	} catch (InterruptedException e){
460	<	unexpectedException();
461	<	}
434	>	public void testTimedPoll0() throws InterruptedException {
435	>	LinkedBlockingQueue q = populatedQueue(SIZE);
436	>	for (int i = 0; i < SIZE; ++i) {
437	>	assertEquals(i, q.poll(0, MILLISECONDS));
438	>	}
439	>	assertNull(q.poll(0, MILLISECONDS));
440		}
441
442		/**
443	<	* timed pool with nonzero timeout succeeds when non-empty, else times out
443	>	* timed poll with nonzero timeout succeeds when non-empty, else times out
444		*/
445	<	public void testTimedPoll() {
446	<	try {
447	<	LinkedBlockingQueue q = populatedQueue(SIZE);
448	<	for (int i = 0; i < SIZE; ++i) {
449	<	assertEquals(i, ((Integer)q.poll(SHORT_DELAY_MS, TimeUnit.MILLISECONDS)).intValue());
450	<	}
451	<	assertNull(q.poll(SHORT_DELAY_MS, TimeUnit.MILLISECONDS));
452	<	} catch (InterruptedException e){
453	<	unexpectedException();
454	<	}
445	>	public void testTimedPoll() throws InterruptedException {
446	>	LinkedBlockingQueue<Integer> q = populatedQueue(SIZE);
447	>	for (int i = 0; i < SIZE; ++i) {
448	>	long startTime = System.nanoTime();
449	>	assertEquals(i, (int) q.poll(LONG_DELAY_MS, MILLISECONDS));
450	>	assertTrue(millisElapsedSince(startTime) < LONG_DELAY_MS);
451	>	}
452	>	long startTime = System.nanoTime();
453	>	assertNull(q.poll(timeoutMillis(), MILLISECONDS));
454	>	assertTrue(millisElapsedSince(startTime) >= timeoutMillis());
455	>	checkEmpty(q);
456		}
457
458		/**
459		* Interrupted timed poll throws InterruptedException instead of
460		* returning timeout status
461		*/
462	<	public void testInterruptedTimedPoll() {
463	<	Thread t = new Thread(new Runnable() {
464	<	public void run() {
465	<	try {
466	<	LinkedBlockingQueue q = populatedQueue(SIZE);
467	<	for (int i = 0; i < SIZE; ++i) {
468	<	threadAssertEquals(i, ((Integer)q.poll(SHORT_DELAY_MS, TimeUnit.MILLISECONDS)).intValue());
469	<	}
491	<	threadAssertNull(q.poll(SHORT_DELAY_MS, TimeUnit.MILLISECONDS));
492	<	} catch (InterruptedException success){
493	<	}
494	<	}});
495	<	t.start();
496	<	try {
497	<	Thread.sleep(SHORT_DELAY_MS);
498	<	t.interrupt();
499	<	t.join();
500	<	}
501	<	catch (InterruptedException ie) {
502	<	unexpectedException();
503	<	}
504	<	}
462	>	public void testInterruptedTimedPoll() throws InterruptedException {
463	>	final BlockingQueue<Integer> q = populatedQueue(SIZE);
464	>	final CountDownLatch pleaseInterrupt = new CountDownLatch(1);
465	>	Thread t = newStartedThread(new CheckedRunnable() {
466	>	public void realRun() throws InterruptedException {
467	>	long startTime = System.nanoTime();
468	>	for (int i = 0; i < SIZE; i++)
469	>	assertEquals(i, (int) q.poll(LONG_DELAY_MS, MILLISECONDS));
470
471	<	/**
472	<	*  timed poll before a delayed offer fails; after offer succeeds;
473	<	*  on interruption throws
474	<	*/
475	<	public void testTimedPollWithOffer() {
476	<	final LinkedBlockingQueue q = new LinkedBlockingQueue(2);
477	<	Thread t = new Thread(new Runnable() {
478	<	public void run() {
479	<	try {
480	<	threadAssertNull(q.poll(SHORT_DELAY_MS, TimeUnit.MILLISECONDS));
481	<	q.poll(LONG_DELAY_MS, TimeUnit.MILLISECONDS);
482	<	q.poll(LONG_DELAY_MS, TimeUnit.MILLISECONDS);
483	<	threadShouldThrow();
484	<	} catch (InterruptedException success) { }
485	<	}
486	<	});
487	<	try {
488	<	t.start();
489	<	Thread.sleep(SMALL_DELAY_MS);
490	<	assertTrue(q.offer(zero, SHORT_DELAY_MS, TimeUnit.MILLISECONDS));
491	<	t.interrupt();
492	<	t.join();
493	<	} catch (Exception e){
529	<	unexpectedException();
530	<	}
531	<	}
471	>	Thread.currentThread().interrupt();
472	>	try {
473	>	q.poll(LONG_DELAY_MS, MILLISECONDS);
474	>	shouldThrow();
475	>	} catch (InterruptedException success) {}
476	>	assertFalse(Thread.interrupted());
477	>
478	>	pleaseInterrupt.countDown();
479	>	try {
480	>	q.poll(LONG_DELAY_MS, MILLISECONDS);
481	>	shouldThrow();
482	>	} catch (InterruptedException success) {}
483	>	assertFalse(Thread.interrupted());
484	>
485	>	assertTrue(millisElapsedSince(startTime) < LONG_DELAY_MS);
486	>	}});
487	>
488	>	await(pleaseInterrupt);
489	>	assertThreadBlocks(t, Thread.State.TIMED_WAITING);
490	>	t.interrupt();
491	>	awaitTermination(t);
492	>	checkEmpty(q);
493	>	}
494
495		/**
496		* peek returns next element, or null if empty
#	Line 536 | Line 498 | public class LinkedBlockingQueueTest ext
498		public void testPeek() {
499		LinkedBlockingQueue q = populatedQueue(SIZE);
500		for (int i = 0; i < SIZE; ++i) {
501	<	assertEquals(i, ((Integer)q.peek()).intValue());
502	<	q.poll();
501	>	assertEquals(i, q.peek());
502	>	assertEquals(i, q.poll());
503		assertTrue(q.peek() == null ||
504	<	i != ((Integer)q.peek()).intValue());
504	>	!q.peek().equals(i));
505		}
506	<	assertNull(q.peek());
506	>	assertNull(q.peek());
507		}
508
509		/**
#	Line 550 | Line 512 | public class LinkedBlockingQueueTest ext
512		public void testElement() {
513		LinkedBlockingQueue q = populatedQueue(SIZE);
514		for (int i = 0; i < SIZE; ++i) {
515	<	assertEquals(i, ((Integer)q.element()).intValue());
516	<	q.poll();
515	>	assertEquals(i, q.element());
516	>	assertEquals(i, q.poll());
517		}
518		try {
519		q.element();
520		shouldThrow();
521	<	}
560	<	catch (NoSuchElementException success) {}
521	>	} catch (NoSuchElementException success) {}
522		}
523
524		/**
#	Line 566 | Line 527 | public class LinkedBlockingQueueTest ext
527		public void testRemove() {
528		LinkedBlockingQueue q = populatedQueue(SIZE);
529		for (int i = 0; i < SIZE; ++i) {
530	<	assertEquals(i, ((Integer)q.remove()).intValue());
530	>	assertEquals(i, q.remove());
531		}
532		try {
533		q.remove();
534		shouldThrow();
535	<	} catch (NoSuchElementException success){
575	<	}
535	>	} catch (NoSuchElementException success) {}
536		}
537
538		/**
539	<	* remove(x) removes x and returns true if present
539	>	* An add following remove(x) succeeds
540		*/
541	<	public void testRemoveElement() {
542	<	LinkedBlockingQueue q = populatedQueue(SIZE);
543	<	for (int i = 1; i < SIZE; i+=2) {
544	<	assertTrue(q.remove(new Integer(i)));
545	<	}
546	<	for (int i = 0; i < SIZE; i+=2) {
547	<	assertTrue(q.remove(new Integer(i)));
548	<	assertFalse(q.remove(new Integer(i+1)));
589	<	}
590	<	assertTrue(q.isEmpty());
541	>	public void testRemoveElementAndAdd() throws InterruptedException {
542	>	LinkedBlockingQueue q = new LinkedBlockingQueue();
543	>	assertTrue(q.add(new Integer(1)));
544	>	assertTrue(q.add(new Integer(2)));
545	>	assertTrue(q.remove(new Integer(1)));
546	>	assertTrue(q.remove(new Integer(2)));
547	>	assertTrue(q.add(new Integer(3)));
548	>	assertNotNull(q.take());
549		}
550	<
550	>
551		/**
552		* contains(x) reports true when elements added but not yet removed
553		*/
#	Line 613 | Line 571 | public class LinkedBlockingQueueTest ext
571		assertEquals(SIZE, q.remainingCapacity());
572		q.add(one);
573		assertFalse(q.isEmpty());
574	+	assertTrue(q.contains(one));
575		q.clear();
576		assertTrue(q.isEmpty());
577		}
#	Line 645 | Line 604 | public class LinkedBlockingQueueTest ext
604		assertTrue(changed);
605
606		assertTrue(q.containsAll(p));
607	<	assertEquals(SIZE-i, q.size());
607	>	assertEquals(SIZE - i, q.size());
608		p.remove();
609		}
610		}
#	Line 658 | Line 617 | public class LinkedBlockingQueueTest ext
617		LinkedBlockingQueue q = populatedQueue(SIZE);
618		LinkedBlockingQueue p = populatedQueue(i);
619		assertTrue(q.removeAll(p));
620	<	assertEquals(SIZE-i, q.size());
620	>	assertEquals(SIZE - i, q.size());
621		for (int j = 0; j < i; ++j) {
622	<	Integer I = (Integer)(p.remove());
623	<	assertFalse(q.contains(I));
622	>	Integer x = (Integer)(p.remove());
623	>	assertFalse(q.contains(x));
624		}
625		}
626		}
627
628		/**
629	<	* toArray contains all elements
629	>	* toArray contains all elements in FIFO order
630		*/
631		public void testToArray() {
632		LinkedBlockingQueue q = populatedQueue(SIZE);
633	<	Object[] o = q.toArray();
634	<	try {
635	<	for(int i = 0; i < o.length; i++)
677	<	assertEquals(o[i], q.take());
678	<	} catch (InterruptedException e){
679	<	unexpectedException();
680	<	}
633	>	Object[] o = q.toArray();
634	>	for (int i = 0; i < o.length; i++)
635	>	assertSame(o[i], q.poll());
636		}
637
638		/**
639	<	* toArray(a) contains all elements
640	<	*/
641	<	public void testToArray2() {
642	<	LinkedBlockingQueue q = populatedQueue(SIZE);
643	<	Integer[] ints = new Integer[SIZE];
644	<	ints = (Integer[])q.toArray(ints);
645	<	try {
646	<	for(int i = 0; i < ints.length; i++)
647	<	assertEquals(ints[i], q.take());
648	<	} catch (InterruptedException e){
649	<	unexpectedException();
650	<	}
639	>	* toArray(a) contains all elements in FIFO order
640	>	*/
641	>	public void testToArray2() throws InterruptedException {
642	>	LinkedBlockingQueue<Integer> q = populatedQueue(SIZE);
643	>	Integer[] ints = new Integer[SIZE];
644	>	Integer[] array = q.toArray(ints);
645	>	assertSame(ints, array);
646	>	for (int i = 0; i < ints.length; i++)
647	>	assertSame(ints[i], q.poll());
648	>	}
649	>
650	>	/**
651	>	* toArray(incompatible array type) throws ArrayStoreException
652	>	*/
653	>	public void testToArray1_BadArg() {
654	>	LinkedBlockingQueue q = populatedQueue(SIZE);
655	>	try {
656	>	q.toArray(new String[10]);
657	>	shouldThrow();
658	>	} catch (ArrayStoreException success) {}
659		}
660	<
660	>
661		/**
662		* iterator iterates through all elements
663		*/
664	<	public void testIterator() {
664	>	public void testIterator() throws InterruptedException {
665		LinkedBlockingQueue q = populatedQueue(SIZE);
666	<	Iterator it = q.iterator();
667	<	try {
668	<	while(it.hasNext()){
669	<	assertEquals(it.next(), q.take());
670	<	}
671	<	} catch (InterruptedException e){
672	<	unexpectedException();
673	<	}
666	>	Iterator it = q.iterator();
667	>	int i;
668	>	for (i = 0; it.hasNext(); i++)
669	>	assertTrue(q.contains(it.next()));
670	>	assertEquals(i, SIZE);
671	>	assertIteratorExhausted(it);
672	>
673	>	it = q.iterator();
674	>	for (i = 0; it.hasNext(); i++)
675	>	assertEquals(it.next(), q.take());
676	>	assertEquals(i, SIZE);
677	>	assertIteratorExhausted(it);
678	>	}
679	>
680	>	/**
681	>	* iterator of empty collection has no elements
682	>	*/
683	>	public void testEmptyIterator() {
684	>	assertIteratorExhausted(new LinkedBlockingQueue().iterator());
685		}
686
687		/**
688		* iterator.remove removes current element
689		*/
690	<	public void testIteratorRemove () {
690	>	public void testIteratorRemove() {
691		final LinkedBlockingQueue q = new LinkedBlockingQueue(3);
692		q.add(two);
693		q.add(one);
#	Line 722 | Line 696 | public class LinkedBlockingQueueTest ext
696		Iterator it = q.iterator();
697		it.next();
698		it.remove();
699	<
699	>
700		it = q.iterator();
701	<	assertEquals(it.next(), one);
702	<	assertEquals(it.next(), three);
701	>	assertSame(it.next(), one);
702	>	assertSame(it.next(), three);
703		assertFalse(it.hasNext());
704		}
705
732	–
706		/**
707		* iterator ordering is FIFO
708		*/
#	Line 741 | Line 714 | public class LinkedBlockingQueueTest ext
714		assertEquals(0, q.remainingCapacity());
715		int k = 0;
716		for (Iterator it = q.iterator(); it.hasNext();) {
717	<	int i = ((Integer)(it.next())).intValue();
745	<	assertEquals(++k, i);
717	>	assertEquals(++k, it.next());
718		}
719		assertEquals(3, k);
720		}
#	Line 750 | Line 722 | public class LinkedBlockingQueueTest ext
722		/**
723		* Modifications do not cause iterators to fail
724		*/
725	<	public void testWeaklyConsistentIteration () {
725	>	public void testWeaklyConsistentIteration() {
726		final LinkedBlockingQueue q = new LinkedBlockingQueue(3);
727		q.add(one);
728		q.add(two);
729		q.add(three);
730	<	try {
731	<	for (Iterator it = q.iterator(); it.hasNext();) {
732	<	q.remove();
761	<	it.next();
762	<	}
763	<	}
764	<	catch (ConcurrentModificationException e) {
765	<	unexpectedException();
730	>	for (Iterator it = q.iterator(); it.hasNext();) {
731	>	q.remove();
732	>	it.next();
733		}
734		assertEquals(0, q.size());
735		}
736
770	–
737		/**
738		* toString contains toStrings of elements
739		*/
#	Line 775 | Line 741 | public class LinkedBlockingQueueTest ext
741		LinkedBlockingQueue q = populatedQueue(SIZE);
742		String s = q.toString();
743		for (int i = 0; i < SIZE; ++i) {
744	<	assertTrue(s.indexOf(String.valueOf(i)) >= 0);
744	>	assertTrue(s.contains(String.valueOf(i)));
745		}
746	<	}
781	<
746	>	}
747
748		/**
749		* offer transfers elements across Executor tasks
#	Line 787 | Line 752 | public class LinkedBlockingQueueTest ext
752		final LinkedBlockingQueue q = new LinkedBlockingQueue(2);
753		q.add(one);
754		q.add(two);
755	<	ExecutorService executor = Executors.newFixedThreadPool(2);
756	<	executor.execute(new Runnable() {
757	<	public void run() {
758	<	threadAssertFalse(q.offer(three));
759	<	try {
760	<	threadAssertTrue(q.offer(three, MEDIUM_DELAY_MS, TimeUnit.MILLISECONDS));
761	<	threadAssertEquals(0, q.remainingCapacity());
762	<	}
763	<	catch (InterruptedException e) {
764	<	threadUnexpectedException();
800	<	}
801	<	}
802	<	});
755	>	final CheckedBarrier threadsStarted = new CheckedBarrier(2);
756	>	final ExecutorService executor = Executors.newFixedThreadPool(2);
757	>	try (PoolCleaner cleaner = cleaner(executor)) {
758	>	executor.execute(new CheckedRunnable() {
759	>	public void realRun() throws InterruptedException {
760	>	assertFalse(q.offer(three));
761	>	threadsStarted.await();
762	>	assertTrue(q.offer(three, LONG_DELAY_MS, MILLISECONDS));
763	>	assertEquals(0, q.remainingCapacity());
764	>	}});
765
766	<	executor.execute(new Runnable() {
767	<	public void run() {
768	<	try {
769	<	Thread.sleep(SMALL_DELAY_MS);
770	<	threadAssertEquals(one, q.take());
771	<	}
810	<	catch (InterruptedException e) {
811	<	threadUnexpectedException();
812	<	}
813	<	}
814	<	});
815	<
816	<	joinPool(executor);
766	>	executor.execute(new CheckedRunnable() {
767	>	public void realRun() throws InterruptedException {
768	>	threadsStarted.await();
769	>	assertSame(one, q.take());
770	>	}});
771	>	}
772		}
773
774		/**
775	<	* poll retrieves elements across Executor threads
775	>	* timed poll retrieves elements across Executor threads
776		*/
777		public void testPollInExecutor() {
778		final LinkedBlockingQueue q = new LinkedBlockingQueue(2);
779	<	ExecutorService executor = Executors.newFixedThreadPool(2);
780	<	executor.execute(new Runnable() {
781	<	public void run() {
782	<	threadAssertNull(q.poll());
783	<	try {
784	<	threadAssertTrue(null != q.poll(MEDIUM_DELAY_MS, TimeUnit.MILLISECONDS));
785	<	threadAssertTrue(q.isEmpty());
786	<	}
787	<	catch (InterruptedException e) {
788	<	threadUnexpectedException();
834	<	}
835	<	}
836	<	});
779	>	final CheckedBarrier threadsStarted = new CheckedBarrier(2);
780	>	final ExecutorService executor = Executors.newFixedThreadPool(2);
781	>	try (PoolCleaner cleaner = cleaner(executor)) {
782	>	executor.execute(new CheckedRunnable() {
783	>	public void realRun() throws InterruptedException {
784	>	assertNull(q.poll());
785	>	threadsStarted.await();
786	>	assertSame(one, q.poll(LONG_DELAY_MS, MILLISECONDS));
787	>	checkEmpty(q);
788	>	}});
789
790	<	executor.execute(new Runnable() {
791	<	public void run() {
792	<	try {
841	<	Thread.sleep(SMALL_DELAY_MS);
790	>	executor.execute(new CheckedRunnable() {
791	>	public void realRun() throws InterruptedException {
792	>	threadsStarted.await();
793		q.put(one);
794	<	}
795	<	catch (InterruptedException e) {
845	<	threadUnexpectedException();
846	<	}
847	<	}
848	<	});
849	<
850	<	joinPool(executor);
794	>	}});
795	>	}
796		}
797
798		/**
799	<	* A deserialized serialized queue has same elements in same order
799	>	* A deserialized/reserialized queue has same elements in same order
800		*/
801	<	public void testSerialization() {
801	>	public void testSerialization() throws Exception {
802	>	Queue x = populatedQueue(SIZE);
803	>	Queue y = serialClone(x);
804	>
805	>	assertNotSame(x, y);
806	>	assertEquals(x.size(), y.size());
807	>	assertEquals(x.toString(), y.toString());
808	>	assertTrue(Arrays.equals(x.toArray(), y.toArray()));
809	>	while (!x.isEmpty()) {
810	>	assertFalse(y.isEmpty());
811	>	assertEquals(x.remove(), y.remove());
812	>	}
813	>	assertTrue(y.isEmpty());
814	>	}
815	>
816	>	/**
817	>	* drainTo(c) empties queue into another collection c
818	>	*/
819	>	public void testDrainTo() {
820		LinkedBlockingQueue q = populatedQueue(SIZE);
821	+	ArrayList l = new ArrayList();
822	+	q.drainTo(l);
823	+	assertEquals(0, q.size());
824	+	assertEquals(SIZE, l.size());
825	+	for (int i = 0; i < SIZE; ++i)
826	+	assertEquals(l.get(i), new Integer(i));
827	+	q.add(zero);
828	+	q.add(one);
829	+	assertFalse(q.isEmpty());
830	+	assertTrue(q.contains(zero));
831	+	assertTrue(q.contains(one));
832	+	l.clear();
833	+	q.drainTo(l);
834	+	assertEquals(0, q.size());
835	+	assertEquals(2, l.size());
836	+	for (int i = 0; i < 2; ++i)
837	+	assertEquals(l.get(i), new Integer(i));
838	+	}
839
840	<	try {
841	<	ByteArrayOutputStream bout = new ByteArrayOutputStream(10000);
842	<	ObjectOutputStream out = new ObjectOutputStream(new BufferedOutputStream(bout));
843	<	out.writeObject(q);
844	<	out.close();
840	>	/**
841	>	* drainTo empties full queue, unblocking a waiting put.
842	>	*/
843	>	public void testDrainToWithActivePut() throws InterruptedException {
844	>	final LinkedBlockingQueue q = populatedQueue(SIZE);
845	>	Thread t = new Thread(new CheckedRunnable() {
846	>	public void realRun() throws InterruptedException {
847	>	q.put(new Integer(SIZE + 1));
848	>	}});
849	>
850	>	t.start();
851	>	ArrayList l = new ArrayList();
852	>	q.drainTo(l);
853	>	assertTrue(l.size() >= SIZE);
854	>	for (int i = 0; i < SIZE; ++i)
855	>	assertEquals(l.get(i), new Integer(i));
856	>	t.join();
857	>	assertTrue(q.size() + l.size() >= SIZE);
858	>	}
859
860	<	ByteArrayInputStream bin = new ByteArrayInputStream(bout.toByteArray());
861	<	ObjectInputStream in = new ObjectInputStream(new BufferedInputStream(bin));
862	<	LinkedBlockingQueue r = (LinkedBlockingQueue)in.readObject();
863	<	assertEquals(q.size(), r.size());
864	<	while (!q.isEmpty())
865	<	assertEquals(q.remove(), r.remove());
866	<	} catch(Exception e){
867	<	unexpectedException();
860	>	/**
861	>	* drainTo(c, n) empties first min(n, size) elements of queue into c
862	>	*/
863	>	public void testDrainToN() {
864	>	LinkedBlockingQueue q = new LinkedBlockingQueue();
865	>	for (int i = 0; i < SIZE + 2; ++i) {
866	>	for (int j = 0; j < SIZE; j++)
867	>	assertTrue(q.offer(new Integer(j)));
868	>	ArrayList l = new ArrayList();
869	>	q.drainTo(l, i);
870	>	int k = (i < SIZE) ? i : SIZE;
871	>	assertEquals(k, l.size());
872	>	assertEquals(SIZE - k, q.size());
873	>	for (int j = 0; j < k; ++j)
874	>	assertEquals(l.get(j), new Integer(j));
875	>	do {} while (q.poll() != null);
876	>	}
877	>	}
878	>
879	>	/**
880	>	* remove(null), contains(null) always return false
881	>	*/
882	>	public void testNeverContainsNull() {
883	>	Collection<?>[] qs = {
884	>	new LinkedBlockingQueue<Object>(),
885	>	populatedQueue(2),
886	>	};
887	>
888	>	for (Collection<?> q : qs) {
889	>	assertFalse(q.contains(null));
890	>	assertFalse(q.remove(null));
891		}
892		}
893

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