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Comparing jsr166/src/test/tck/LinkedBlockingQueueTest.java (file contents):
Revision 1.38 by jsr166, Thu Nov 18 20:21:53 2010 UTC vs.
Revision 1.84 by jsr166, Wed Jan 27 02:55:18 2021 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 Andrew Wright, Jeffrey Hayes,
6		* Pat Fisher, Mike Judd.
7		*/
8
9	–	import junit.framework.*;
10	–	import java.util.*;
11	–	import java.util.concurrent.*;
9		import static java.util.concurrent.TimeUnit.MILLISECONDS;
10	<	import java.io.*;
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
#	Line 22 | Line 32 | public class LinkedBlockingQueueTest ext
32
33		public static class Bounded extends BlockingQueueTest {
34		protected BlockingQueue emptyCollection() {
35	<	return new LinkedBlockingQueue(20);
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	+	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 JSR166TestCase.itemFor(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());
53	>	new Bounded().testSuite(),
54	>	CollectionTest.testSuite(new Implementation()));
55		}
56
39	–
57		/**
58	<	* Create a queue of given size containing consecutive
59	<	* Integers 0 ... n.
58	>	* Returns a new queue of given size containing consecutive
59	>	* Items 0 ... n - 1.
60		*/
61	<	private LinkedBlockingQueue<Integer> populatedQueue(int n) {
62	<	LinkedBlockingQueue<Integer> q =
46	<	new LinkedBlockingQueue<Integer>(n);
61	>	private static LinkedBlockingQueue<Item> populatedQueue(int n) {
62	>	LinkedBlockingQueue<Item> q = new LinkedBlockingQueue<>(n);
63		assertTrue(q.isEmpty());
64		for (int i = 0; i < n; i++)
65	<	assertTrue(q.offer(new Integer(i)));
65	>	mustOffer(q, i);
66		assertFalse(q.isEmpty());
67	<	assertEquals(0, q.remainingCapacity());
68	<	assertEquals(n, q.size());
67	>	mustEqual(0, q.remainingCapacity());
68	>	mustEqual(n, q.size());
69	>	mustEqual(0, q.peek());
70		return q;
71		}
72
#	Line 58 | Line 75 | public class LinkedBlockingQueueTest ext
75		* none given
76		*/
77		public void testConstructor1() {
78	<	assertEquals(SIZE, new LinkedBlockingQueue(SIZE).remainingCapacity());
79	<	assertEquals(Integer.MAX_VALUE, new LinkedBlockingQueue().remainingCapacity());
78	>	mustEqual(SIZE, new LinkedBlockingQueue<Item>(SIZE).remainingCapacity());
79	>	mustEqual(Integer.MAX_VALUE, new LinkedBlockingQueue<Item>().remainingCapacity());
80		}
81
82		/**
83	<	* Constructor throws IAE if capacity argument nonpositive
83	>	* Constructor throws IllegalArgumentException if capacity argument nonpositive
84		*/
85		public void testConstructor2() {
86		try {
87	<	LinkedBlockingQueue q = new LinkedBlockingQueue(0);
87	>	new LinkedBlockingQueue<Item>(0);
88		shouldThrow();
89		} catch (IllegalArgumentException success) {}
90		}
91
92		/**
93	<	* Initializing from null Collection throws NPE
93	>	* Initializing from null Collection throws NullPointerException
94		*/
95		public void testConstructor3() {
96		try {
97	<	LinkedBlockingQueue q = new LinkedBlockingQueue(null);
97	>	new LinkedBlockingQueue<Item>(null);
98		shouldThrow();
99		} catch (NullPointerException success) {}
100		}
101
102		/**
103	<	* Initializing from Collection of null elements throws NPE
103	>	* Initializing from Collection of null elements throws NullPointerException
104		*/
105		public void testConstructor4() {
106	+	Collection<Item> elements = Arrays.asList(new Item[SIZE]);
107		try {
108	<	Integer[] ints = new Integer[SIZE];
91	<	LinkedBlockingQueue q = new LinkedBlockingQueue(Arrays.asList(ints));
108	>	new LinkedBlockingQueue<Item>(elements);
109		shouldThrow();
110		} catch (NullPointerException success) {}
111		}
112
113		/**
114	<	* Initializing from Collection with some null elements throws NPE
114	>	* Initializing from Collection with some null elements throws
115	>	* NullPointerException
116		*/
117		public void testConstructor5() {
118	+	Item[] items = new Item[2];
119	+	items[0] = zero;
120	+	Collection<Item> elements = Arrays.asList(items);
121		try {
122	<	Integer[] ints = new Integer[SIZE];
102	<	for (int i = 0; i < SIZE-1; ++i)
103	<	ints[i] = new Integer(i);
104	<	LinkedBlockingQueue q = new LinkedBlockingQueue(Arrays.asList(ints));
122	>	new LinkedBlockingQueue<Item>(elements);
123		shouldThrow();
124		} catch (NullPointerException success) {}
125		}
#	Line 110 | Line 128 | public class LinkedBlockingQueueTest ext
128		* Queue contains all elements of collection used to initialize
129		*/
130		public void testConstructor6() {
131	<	Integer[] ints = new Integer[SIZE];
132	<	for (int i = 0; i < SIZE; ++i)
115	<	ints[i] = new Integer(i);
116	<	LinkedBlockingQueue q = new LinkedBlockingQueue(Arrays.asList(ints));
131	>	Item[] items = defaultItems;
132	>	LinkedBlockingQueue<Item> q = new LinkedBlockingQueue<>(Arrays.asList(items));
133		for (int i = 0; i < SIZE; ++i)
134	<	assertEquals(ints[i], q.poll());
134	>	mustEqual(items[i], q.poll());
135		}
136
137		/**
138		* Queue transitions from empty to full when elements added
139		*/
140		public void testEmptyFull() {
141	<	LinkedBlockingQueue q = new LinkedBlockingQueue(2);
141	>	LinkedBlockingQueue<Item> q = new LinkedBlockingQueue<>(2);
142		assertTrue(q.isEmpty());
143	<	assertEquals("should have room for 2", 2, q.remainingCapacity());
143	>	mustEqual(2, q.remainingCapacity());
144		q.add(one);
145		assertFalse(q.isEmpty());
146		q.add(two);
147		assertFalse(q.isEmpty());
148	<	assertEquals(0, q.remainingCapacity());
148	>	mustEqual(0, q.remainingCapacity());
149		assertFalse(q.offer(three));
150		}
151
#	Line 137 | Line 153 | public class LinkedBlockingQueueTest ext
153		* remainingCapacity decreases on add, increases on remove
154		*/
155		public void testRemainingCapacity() {
156	<	LinkedBlockingQueue q = populatedQueue(SIZE);
156	>	BlockingQueue<Item> q = populatedQueue(SIZE);
157		for (int i = 0; i < SIZE; ++i) {
158	<	assertEquals(i, q.remainingCapacity());
159	<	assertEquals(SIZE-i, q.size());
160	<	q.remove();
158	>	mustEqual(i, q.remainingCapacity());
159	>	mustEqual(SIZE, q.size() + q.remainingCapacity());
160	>	mustEqual(i, q.remove());
161		}
162		for (int i = 0; i < SIZE; ++i) {
163	<	assertEquals(SIZE-i, q.remainingCapacity());
164	<	assertEquals(i, q.size());
165	<	q.add(new Integer(i));
163	>	mustEqual(SIZE - i, q.remainingCapacity());
164	>	mustEqual(SIZE, q.size() + q.remainingCapacity());
165	>	mustAdd(q, i);
166		}
167		}
168
169		/**
154	–	* offer(null) throws NPE
155	–	*/
156	–	public void testOfferNull() {
157	–	try {
158	–	LinkedBlockingQueue q = new LinkedBlockingQueue(1);
159	–	q.offer(null);
160	–	shouldThrow();
161	–	} catch (NullPointerException success) {}
162	–	}
163	–
164	–	/**
165	–	* add(null) throws NPE
166	–	*/
167	–	public void testAddNull() {
168	–	try {
169	–	LinkedBlockingQueue q = new LinkedBlockingQueue(1);
170	–	q.add(null);
171	–	shouldThrow();
172	–	} catch (NullPointerException success) {}
173	–	}
174	–
175	–	/**
170		* Offer succeeds if not full; fails if full
171		*/
172		public void testOffer() {
173	<	LinkedBlockingQueue q = new LinkedBlockingQueue(1);
173	>	LinkedBlockingQueue<Item> q = new LinkedBlockingQueue<>(1);
174		assertTrue(q.offer(zero));
175		assertFalse(q.offer(one));
176		}
177
178		/**
179	<	* add succeeds if not full; throws ISE if full
179	>	* add succeeds if not full; throws IllegalStateException if full
180		*/
181		public void testAdd() {
182	+	LinkedBlockingQueue<Item> q = new LinkedBlockingQueue<>(SIZE);
183	+	for (int i = 0; i < SIZE; ++i)
184	+	mustAdd(q, i);
185	+	mustEqual(0, q.remainingCapacity());
186		try {
187	<	LinkedBlockingQueue q = new LinkedBlockingQueue(SIZE);
190	<	for (int i = 0; i < SIZE; ++i) {
191	<	assertTrue(q.add(new Integer(i)));
192	<	}
193	<	assertEquals(0, q.remainingCapacity());
194	<	q.add(new Integer(SIZE));
187	>	q.add(new Item(SIZE));
188		shouldThrow();
189		} catch (IllegalStateException success) {}
190		}
191
192		/**
193	<	* addAll(null) throws NPE
201	<	*/
202	<	public void testAddAll1() {
203	<	try {
204	<	LinkedBlockingQueue q = new LinkedBlockingQueue(1);
205	<	q.addAll(null);
206	<	shouldThrow();
207	<	} catch (NullPointerException success) {}
208	<	}
209	<
210	<	/**
211	<	* addAll(this) throws IAE
193	>	* addAll(this) throws IllegalArgumentException
194		*/
195		public void testAddAllSelf() {
196	+	LinkedBlockingQueue<Item> q = populatedQueue(SIZE);
197		try {
215	–	LinkedBlockingQueue q = populatedQueue(SIZE);
198		q.addAll(q);
199		shouldThrow();
200		} catch (IllegalArgumentException success) {}
201		}
202
203		/**
222	–	* addAll of a collection with null elements throws NPE
223	–	*/
224	–	public void testAddAll2() {
225	–	try {
226	–	LinkedBlockingQueue q = new LinkedBlockingQueue(SIZE);
227	–	Integer[] ints = new Integer[SIZE];
228	–	q.addAll(Arrays.asList(ints));
229	–	shouldThrow();
230	–	} catch (NullPointerException success) {}
231	–	}
232	–
233	–	/**
204		* addAll of a collection with any null elements throws NPE after
205		* possibly adding some elements
206		*/
207		public void testAddAll3() {
208	+	LinkedBlockingQueue<Item> q = new LinkedBlockingQueue<>(SIZE);
209	+	Item[] items = new Item[2]; items[0] = zero;
210	+	Collection<Item> elements = Arrays.asList(items);
211		try {
212	<	LinkedBlockingQueue q = new LinkedBlockingQueue(SIZE);
240	<	Integer[] ints = new Integer[SIZE];
241	<	for (int i = 0; i < SIZE-1; ++i)
242	<	ints[i] = new Integer(i);
243	<	q.addAll(Arrays.asList(ints));
212	>	q.addAll(elements);
213		shouldThrow();
214		} catch (NullPointerException success) {}
215		}
216
217		/**
218	<	* addAll throws ISE if not enough room
218	>	* addAll throws IllegalStateException if not enough room
219		*/
220		public void testAddAll4() {
221	+	LinkedBlockingQueue<Item> q = new LinkedBlockingQueue<>(SIZE - 1);
222	+	Item[] items = defaultItems;
223	+	Collection<Item> elements = Arrays.asList(items);
224		try {
225	<	LinkedBlockingQueue q = new LinkedBlockingQueue(1);
254	<	Integer[] ints = new Integer[SIZE];
255	<	for (int i = 0; i < SIZE; ++i)
256	<	ints[i] = new Integer(i);
257	<	q.addAll(Arrays.asList(ints));
225	>	q.addAll(elements);
226		shouldThrow();
227		} catch (IllegalStateException success) {}
228		}
#	Line 263 | Line 231 | public class LinkedBlockingQueueTest ext
231		* Queue contains all elements, in traversal order, of successful addAll
232		*/
233		public void testAddAll5() {
234	<	Integer[] empty = new Integer[0];
235	<	Integer[] ints = new Integer[SIZE];
236	<	for (int i = 0; i < SIZE; ++i)
269	<	ints[i] = new Integer(i);
270	<	LinkedBlockingQueue q = new LinkedBlockingQueue(SIZE);
234	>	Item[] empty = new Item[0];
235	>	Item[] items = defaultItems;
236	>	LinkedBlockingQueue<Item> q = new LinkedBlockingQueue<>(SIZE);
237		assertFalse(q.addAll(Arrays.asList(empty)));
238	<	assertTrue(q.addAll(Arrays.asList(ints)));
238	>	assertTrue(q.addAll(Arrays.asList(items)));
239		for (int i = 0; i < SIZE; ++i)
240	<	assertEquals(ints[i], q.poll());
240	>	mustEqual(items[i], q.poll());
241		}
242
243		/**
278	–	* put(null) throws NPE
279	–	*/
280	–	public void testPutNull() throws InterruptedException {
281	–	try {
282	–	LinkedBlockingQueue q = new LinkedBlockingQueue(SIZE);
283	–	q.put(null);
284	–	shouldThrow();
285	–	} catch (NullPointerException success) {}
286	–	}
287	–
288	–	/**
244		* all elements successfully put are contained
245		*/
246		public void testPut() throws InterruptedException {
247	<	LinkedBlockingQueue q = new LinkedBlockingQueue(SIZE);
247	>	LinkedBlockingQueue<Item> q = new LinkedBlockingQueue<>(SIZE);
248		for (int i = 0; i < SIZE; ++i) {
249	<	Integer I = new Integer(i);
250	<	q.put(I);
251	<	assertTrue(q.contains(I));
249	>	Item x = itemFor(i);
250	>	q.put(x);
251	>	mustContain(q, x);
252		}
253	<	assertEquals(0, q.remainingCapacity());
253	>	mustEqual(0, q.remainingCapacity());
254		}
255
256		/**
257		* put blocks interruptibly if full
258		*/
259		public void testBlockingPut() throws InterruptedException {
260	<	final LinkedBlockingQueue q = new LinkedBlockingQueue(SIZE);
261	<	Thread t = new Thread(new CheckedRunnable() {
260	>	final LinkedBlockingQueue<Item> q = new LinkedBlockingQueue<>(SIZE);
261	>	final CountDownLatch pleaseInterrupt = new CountDownLatch(1);
262	>	Thread t = newStartedThread(new CheckedRunnable() {
263		public void realRun() throws InterruptedException {
264		for (int i = 0; i < SIZE; ++i)
265	<	q.put(i);
266	<	assertEquals(SIZE, q.size());
267	<	assertEquals(0, q.remainingCapacity());
265	>	q.put(itemFor(i));
266	>	mustEqual(SIZE, q.size());
267	>	mustEqual(0, q.remainingCapacity());
268	>
269	>	Thread.currentThread().interrupt();
270		try {
271	<	q.put(99);
271	>	q.put(ninetynine);
272		shouldThrow();
273		} catch (InterruptedException success) {}
274	+	assertFalse(Thread.interrupted());
275	+
276	+	pleaseInterrupt.countDown();
277	+	try {
278	+	q.put(ninetynine);
279	+	shouldThrow();
280	+	} catch (InterruptedException success) {}
281	+	assertFalse(Thread.interrupted());
282		}});
283
284	<	t.start();
285	<	Thread.sleep(SHORT_DELAY_MS);
284	>	await(pleaseInterrupt);
285	>	if (randomBoolean()) assertThreadBlocks(t, Thread.State.WAITING);
286		t.interrupt();
287	<	t.join();
288	<	assertEquals(SIZE, q.size());
289	<	assertEquals(0, q.remainingCapacity());
287	>	awaitTermination(t);
288	>	mustEqual(SIZE, q.size());
289	>	mustEqual(0, q.remainingCapacity());
290		}
291
292		/**
293	<	* put blocks waiting for take when full
293	>	* put blocks interruptibly waiting for take when full
294		*/
295		public void testPutWithTake() throws InterruptedException {
296		final int capacity = 2;
297	<	final LinkedBlockingQueue q = new LinkedBlockingQueue(2);
298	<	Thread t = new Thread(new CheckedRunnable() {
297	>	final LinkedBlockingQueue<Item> q = new LinkedBlockingQueue<>(2);
298	>	final CountDownLatch pleaseTake = new CountDownLatch(1);
299	>	final CountDownLatch pleaseInterrupt = new CountDownLatch(1);
300	>	Thread t = newStartedThread(new CheckedRunnable() {
301		public void realRun() throws InterruptedException {
302	<	for (int i = 0; i < capacity + 1; i++)
303	<	q.put(i);
302	>	for (int i = 0; i < capacity; i++)
303	>	q.put(itemFor(i));
304	>	pleaseTake.countDown();
305	>	q.put(eightysix);
306	>
307	>	Thread.currentThread().interrupt();
308		try {
309	<	q.put(99);
309	>	q.put(ninetynine);
310		shouldThrow();
311		} catch (InterruptedException success) {}
312	+	assertFalse(Thread.interrupted());
313	+
314	+	pleaseInterrupt.countDown();
315	+	try {
316	+	q.put(ninetynine);
317	+	shouldThrow();
318	+	} catch (InterruptedException success) {}
319	+	assertFalse(Thread.interrupted());
320		}});
321
322	<	t.start();
323	<	Thread.sleep(SHORT_DELAY_MS);
324	<	assertEquals(q.remainingCapacity(), 0);
325	<	assertEquals(0, q.take());
326	<	Thread.sleep(SHORT_DELAY_MS);
322	>	await(pleaseTake);
323	>	mustEqual(0, q.remainingCapacity());
324	>	mustEqual(0, q.take());
325	>
326	>	await(pleaseInterrupt);
327	>	if (randomBoolean()) assertThreadBlocks(t, Thread.State.WAITING);
328		t.interrupt();
329	<	t.join();
330	<	assertEquals(q.remainingCapacity(), 0);
329	>	awaitTermination(t);
330	>	mustEqual(0, q.remainingCapacity());
331		}
332
333		/**
334		* timed offer times out if full and elements not taken
335		*/
336	<	public void testTimedOffer() throws InterruptedException {
337	<	final LinkedBlockingQueue q = new LinkedBlockingQueue(2);
338	<	Thread t = new Thread(new CheckedRunnable() {
336	>	public void testTimedOffer() {
337	>	final LinkedBlockingQueue<Item> q = new LinkedBlockingQueue<>(2);
338	>	final CountDownLatch pleaseInterrupt = new CountDownLatch(1);
339	>	Thread t = newStartedThread(new CheckedRunnable() {
340		public void realRun() throws InterruptedException {
341	<	q.put(new Object());
342	<	q.put(new Object());
343	<	assertFalse(q.offer(new Object(), SHORT_DELAY_MS, MILLISECONDS));
341	>	q.put(zero);
342	>	q.put(one);
343	>	long startTime = System.nanoTime();
344	>
345	>	assertFalse(q.offer(two, timeoutMillis(), MILLISECONDS));
346	>	assertTrue(millisElapsedSince(startTime) >= timeoutMillis());
347	>
348	>	Thread.currentThread().interrupt();
349	>	try {
350	>	q.offer(three, randomTimeout(), randomTimeUnit());
351	>	shouldThrow();
352	>	} catch (InterruptedException success) {}
353	>	assertFalse(Thread.interrupted());
354	>
355	>	pleaseInterrupt.countDown();
356		try {
357	<	q.offer(new Object(), LONG_DELAY_MS, MILLISECONDS);
357	>	q.offer(two, LONGER_DELAY_MS, MILLISECONDS);
358		shouldThrow();
359		} catch (InterruptedException success) {}
360	+	assertFalse(Thread.interrupted());
361		}});
362
363	<	t.start();
364	<	Thread.sleep(SMALL_DELAY_MS);
363	>	await(pleaseInterrupt);
364	>	if (randomBoolean()) assertThreadBlocks(t, Thread.State.TIMED_WAITING);
365		t.interrupt();
366	<	t.join();
366	>	awaitTermination(t);
367		}
368
369		/**
370		* take retrieves elements in FIFO order
371		*/
372		public void testTake() throws InterruptedException {
373	<	LinkedBlockingQueue q = populatedQueue(SIZE);
373	>	LinkedBlockingQueue<Item> q = populatedQueue(SIZE);
374		for (int i = 0; i < SIZE; ++i) {
375	<	assertEquals(i, q.take());
375	>	mustEqual(i, q.take());
376		}
377		}
378
#	Line 385 | Line 380 | public class LinkedBlockingQueueTest ext
380		* Take removes existing elements until empty, then blocks interruptibly
381		*/
382		public void testBlockingTake() throws InterruptedException {
383	<	final LinkedBlockingQueue q = populatedQueue(SIZE);
384	<	Thread t = new Thread(new CheckedRunnable() {
383	>	final BlockingQueue<Item> q = populatedQueue(SIZE);
384	>	final CountDownLatch pleaseInterrupt = new CountDownLatch(1);
385	>	Thread t = newStartedThread(new CheckedRunnable() {
386		public void realRun() throws InterruptedException {
387	<	for (int i = 0; i < SIZE; ++i) {
388	<	assertEquals(i, q.take());
389	<	}
387	>	for (int i = 0; i < SIZE; i++) mustEqual(i, q.take());
388	>
389	>	Thread.currentThread().interrupt();
390	>	try {
391	>	q.take();
392	>	shouldThrow();
393	>	} catch (InterruptedException success) {}
394	>	assertFalse(Thread.interrupted());
395	>
396	>	pleaseInterrupt.countDown();
397		try {
398		q.take();
399		shouldThrow();
400		} catch (InterruptedException success) {}
401	+	assertFalse(Thread.interrupted());
402		}});
403
404	<	t.start();
405	<	Thread.sleep(SHORT_DELAY_MS);
404	>	await(pleaseInterrupt);
405	>	if (randomBoolean()) assertThreadBlocks(t, Thread.State.WAITING);
406		t.interrupt();
407	<	t.join();
407	>	awaitTermination(t);
408		}
409
410		/**
411		* poll succeeds unless empty
412		*/
413		public void testPoll() {
414	<	LinkedBlockingQueue q = populatedQueue(SIZE);
414	>	LinkedBlockingQueue<Item> q = populatedQueue(SIZE);
415		for (int i = 0; i < SIZE; ++i) {
416	<	assertEquals(i, q.poll());
416	>	mustEqual(i, q.poll());
417		}
418		assertNull(q.poll());
419		}
#	Line 418 | Line 422 | public class LinkedBlockingQueueTest ext
422		* timed poll with zero timeout succeeds when non-empty, else times out
423		*/
424		public void testTimedPoll0() throws InterruptedException {
425	<	LinkedBlockingQueue q = populatedQueue(SIZE);
425	>	LinkedBlockingQueue<Item> q = populatedQueue(SIZE);
426		for (int i = 0; i < SIZE; ++i) {
427	<	assertEquals(i, q.poll(0, MILLISECONDS));
427	>	mustEqual(i, q.poll(0, MILLISECONDS));
428		}
429		assertNull(q.poll(0, MILLISECONDS));
430		}
#	Line 429 | Line 433 | public class LinkedBlockingQueueTest ext
433		* timed poll with nonzero timeout succeeds when non-empty, else times out
434		*/
435		public void testTimedPoll() throws InterruptedException {
436	<	LinkedBlockingQueue q = populatedQueue(SIZE);
436	>	LinkedBlockingQueue<Item> q = populatedQueue(SIZE);
437		for (int i = 0; i < SIZE; ++i) {
438	<	assertEquals(i, q.poll(SHORT_DELAY_MS, MILLISECONDS));
439	<	}
440	<	assertNull(q.poll(SHORT_DELAY_MS, MILLISECONDS));
438	>	long startTime = System.nanoTime();
439	>	mustEqual(i, q.poll(LONG_DELAY_MS, MILLISECONDS));
440	>	assertTrue(millisElapsedSince(startTime) < LONG_DELAY_MS);
441	>	}
442	>	long startTime = System.nanoTime();
443	>	assertNull(q.poll(timeoutMillis(), MILLISECONDS));
444	>	assertTrue(millisElapsedSince(startTime) >= timeoutMillis());
445	>	checkEmpty(q);
446		}
447
448		/**
#	Line 441 | Line 450 | public class LinkedBlockingQueueTest ext
450		* returning timeout status
451		*/
452		public void testInterruptedTimedPoll() throws InterruptedException {
453	<	Thread t = new Thread(new CheckedRunnable() {
453	>	final BlockingQueue<Item> q = populatedQueue(SIZE);
454	>	final CountDownLatch pleaseInterrupt = new CountDownLatch(1);
455	>	Thread t = newStartedThread(new CheckedRunnable() {
456		public void realRun() throws InterruptedException {
457	<	LinkedBlockingQueue q = populatedQueue(SIZE);
458	<	for (int i = 0; i < SIZE; ++i) {
459	<	assertEquals(i, q.poll(SHORT_DELAY_MS, MILLISECONDS));
460	<	}
457	>	for (int i = 0; i < SIZE; i++)
458	>	mustEqual(i, q.poll(LONG_DELAY_MS, MILLISECONDS));
459	>
460	>	Thread.currentThread().interrupt();
461	>	try {
462	>	q.poll(randomTimeout(), randomTimeUnit());
463	>	shouldThrow();
464	>	} catch (InterruptedException success) {}
465	>	assertFalse(Thread.interrupted());
466	>
467	>	pleaseInterrupt.countDown();
468		try {
469	<	q.poll(SMALL_DELAY_MS, MILLISECONDS);
469	>	q.poll(LONGER_DELAY_MS, MILLISECONDS);
470		shouldThrow();
471		} catch (InterruptedException success) {}
472	+	assertFalse(Thread.interrupted());
473		}});
474
475	<	t.start();
476	<	Thread.sleep(SHORT_DELAY_MS);
475	>	await(pleaseInterrupt);
476	>	if (randomBoolean()) assertThreadBlocks(t, Thread.State.TIMED_WAITING);
477		t.interrupt();
478	<	t.join();
478	>	awaitTermination(t);
479	>	checkEmpty(q);
480		}
481
482		/**
483		* peek returns next element, or null if empty
484		*/
485		public void testPeek() {
486	<	LinkedBlockingQueue q = populatedQueue(SIZE);
486	>	LinkedBlockingQueue<Item> q = populatedQueue(SIZE);
487		for (int i = 0; i < SIZE; ++i) {
488	<	assertEquals(i, q.peek());
489	<	assertEquals(i, q.poll());
488	>	mustEqual(i, q.peek());
489	>	mustEqual(i, q.poll());
490		assertTrue(q.peek() == null ||
491		!q.peek().equals(i));
492		}
#	Line 477 | Line 497 | public class LinkedBlockingQueueTest ext
497		* element returns next element, or throws NSEE if empty
498		*/
499		public void testElement() {
500	<	LinkedBlockingQueue q = populatedQueue(SIZE);
500	>	LinkedBlockingQueue<Item> q = populatedQueue(SIZE);
501		for (int i = 0; i < SIZE; ++i) {
502	<	assertEquals(i, q.element());
503	<	assertEquals(i, q.poll());
502	>	mustEqual(i, q.element());
503	>	mustEqual(i, q.poll());
504		}
505		try {
506		q.element();
#	Line 492 | Line 512 | public class LinkedBlockingQueueTest ext
512		* remove removes next element, or throws NSEE if empty
513		*/
514		public void testRemove() {
515	<	LinkedBlockingQueue q = populatedQueue(SIZE);
515	>	LinkedBlockingQueue<Item> q = populatedQueue(SIZE);
516		for (int i = 0; i < SIZE; ++i) {
517	<	assertEquals(i, q.remove());
517	>	mustEqual(i, q.remove());
518		}
519		try {
520		q.remove();
#	Line 503 | Line 523 | public class LinkedBlockingQueueTest ext
523		}
524
525		/**
506	–	* remove(x) removes x and returns true if present
507	–	*/
508	–	public void testRemoveElement() {
509	–	LinkedBlockingQueue q = populatedQueue(SIZE);
510	–	for (int i = 1; i < SIZE; i+=2) {
511	–	assertTrue(q.contains(i));
512	–	assertTrue(q.remove(i));
513	–	assertFalse(q.contains(i));
514	–	assertTrue(q.contains(i-1));
515	–	}
516	–	for (int i = 0; i < SIZE; i+=2) {
517	–	assertTrue(q.contains(i));
518	–	assertTrue(q.remove(i));
519	–	assertFalse(q.contains(i));
520	–	assertFalse(q.remove(i+1));
521	–	assertFalse(q.contains(i+1));
522	–	}
523	–	assertTrue(q.isEmpty());
524	–	}
525	–
526	–	/**
526		* An add following remove(x) succeeds
527		*/
528		public void testRemoveElementAndAdd() throws InterruptedException {
529	<	LinkedBlockingQueue q = new LinkedBlockingQueue();
530	<	assertTrue(q.add(new Integer(1)));
531	<	assertTrue(q.add(new Integer(2)));
532	<	assertTrue(q.remove(new Integer(1)));
533	<	assertTrue(q.remove(new Integer(2)));
534	<	assertTrue(q.add(new Integer(3)));
535	<	assertTrue(q.take() != null);
529	>	LinkedBlockingQueue<Item> q = new LinkedBlockingQueue<>();
530	>	assertTrue(q.add(one));
531	>	assertTrue(q.add(two));
532	>	mustRemove(q, one);
533	>	mustRemove(q, two);
534	>	mustAdd(q, three);
535	>	assertNotNull(q.take());
536		}
537
538		/**
539		* contains(x) reports true when elements added but not yet removed
540		*/
541		public void testContains() {
542	<	LinkedBlockingQueue q = populatedQueue(SIZE);
542	>	LinkedBlockingQueue<Item> q = populatedQueue(SIZE);
543		for (int i = 0; i < SIZE; ++i) {
544	<	assertTrue(q.contains(new Integer(i)));
544	>	mustContain(q, i);
545		q.poll();
546	<	assertFalse(q.contains(new Integer(i)));
546	>	mustNotContain(q, i);
547		}
548		}
549
#	Line 552 | Line 551 | public class LinkedBlockingQueueTest ext
551		* clear removes all elements
552		*/
553		public void testClear() {
554	<	LinkedBlockingQueue q = populatedQueue(SIZE);
554	>	LinkedBlockingQueue<Item> q = populatedQueue(SIZE);
555		q.clear();
556		assertTrue(q.isEmpty());
557	<	assertEquals(0, q.size());
558	<	assertEquals(SIZE, q.remainingCapacity());
557	>	mustEqual(0, q.size());
558	>	mustEqual(SIZE, q.remainingCapacity());
559		q.add(one);
560		assertFalse(q.isEmpty());
561		assertTrue(q.contains(one));
#	Line 568 | Line 567 | public class LinkedBlockingQueueTest ext
567		* containsAll(c) is true when c contains a subset of elements
568		*/
569		public void testContainsAll() {
570	<	LinkedBlockingQueue q = populatedQueue(SIZE);
571	<	LinkedBlockingQueue p = new LinkedBlockingQueue(SIZE);
570	>	LinkedBlockingQueue<Item> q = populatedQueue(SIZE);
571	>	LinkedBlockingQueue<Item> p = new LinkedBlockingQueue<>(SIZE);
572		for (int i = 0; i < SIZE; ++i) {
573		assertTrue(q.containsAll(p));
574		assertFalse(p.containsAll(q));
575	<	p.add(new Integer(i));
575	>	mustAdd(p, i);
576		}
577		assertTrue(p.containsAll(q));
578		}
#	Line 582 | Line 581 | public class LinkedBlockingQueueTest ext
581		* retainAll(c) retains only those elements of c and reports true if changed
582		*/
583		public void testRetainAll() {
584	<	LinkedBlockingQueue q = populatedQueue(SIZE);
585	<	LinkedBlockingQueue p = populatedQueue(SIZE);
584	>	LinkedBlockingQueue<Item> q = populatedQueue(SIZE);
585	>	LinkedBlockingQueue<Item> p = populatedQueue(SIZE);
586		for (int i = 0; i < SIZE; ++i) {
587		boolean changed = q.retainAll(p);
588		if (i == 0)
#	Line 592 | Line 591 | public class LinkedBlockingQueueTest ext
591		assertTrue(changed);
592
593		assertTrue(q.containsAll(p));
594	<	assertEquals(SIZE-i, q.size());
594	>	mustEqual(SIZE - i, q.size());
595		p.remove();
596		}
597		}
#	Line 602 | Line 601 | public class LinkedBlockingQueueTest ext
601		*/
602		public void testRemoveAll() {
603		for (int i = 1; i < SIZE; ++i) {
604	<	LinkedBlockingQueue q = populatedQueue(SIZE);
605	<	LinkedBlockingQueue p = populatedQueue(i);
604	>	LinkedBlockingQueue<Item> q = populatedQueue(SIZE);
605	>	LinkedBlockingQueue<Item> p = populatedQueue(i);
606		assertTrue(q.removeAll(p));
607	<	assertEquals(SIZE-i, q.size());
607	>	mustEqual(SIZE - i, q.size());
608		for (int j = 0; j < i; ++j) {
609	<	Integer I = (Integer)(p.remove());
611	<	assertFalse(q.contains(I));
609	>	mustNotContain(q, p.remove());
610		}
611		}
612		}
#	Line 617 | Line 615 | public class LinkedBlockingQueueTest ext
615		* toArray contains all elements in FIFO order
616		*/
617		public void testToArray() {
618	<	LinkedBlockingQueue q = populatedQueue(SIZE);
619	<	Object[] o = q.toArray();
620	<	for (int i = 0; i < o.length; i++)
621	<	assertSame(o[i], q.poll());
618	>	LinkedBlockingQueue<Item> q = populatedQueue(SIZE);
619	>	Object[] a = q.toArray();
620	>	assertSame(Object[].class, a.getClass());
621	>	for (Object o : a)
622	>	assertSame(o, q.poll());
623	>	assertTrue(q.isEmpty());
624		}
625
626		/**
627		* toArray(a) contains all elements in FIFO order
628		*/
629		public void testToArray2() throws InterruptedException {
630	<	LinkedBlockingQueue<Integer> q = populatedQueue(SIZE);
631	<	Integer[] ints = new Integer[SIZE];
632	<	Integer[] array = q.toArray(ints);
633	<	assertSame(ints, array);
634	<	for (int i = 0; i < ints.length; i++)
635	<	assertSame(ints[i], q.poll());
636	<	}
637	<
638	<	/**
639	<	* toArray(null) throws NullPointerException
640	<	*/
641	<	public void testToArray_NullArg() {
642	<	LinkedBlockingQueue q = populatedQueue(SIZE);
643	<	try {
644	<	q.toArray(null);
645	<	shouldThrow();
646	<	} catch (NullPointerException success) {}
630	>	LinkedBlockingQueue<Item> q = populatedQueue(SIZE);
631	>	Item[] items = new Item[SIZE];
632	>	Item[] array = q.toArray(items);
633	>	assertSame(items, array);
634	>	for (Item o : items)
635	>	assertSame(o, q.poll());
636	>	assertTrue(q.isEmpty());
637		}
638
639		/**
640		* toArray(incompatible array type) throws ArrayStoreException
641		*/
642	<	public void testToArray1_BadArg() {
643	<	LinkedBlockingQueue q = populatedQueue(SIZE);
642	>	@SuppressWarnings("CollectionToArraySafeParameter")
643	>	public void testToArray_incompatibleArrayType() {
644	>	LinkedBlockingQueue<Item> q = populatedQueue(SIZE);
645		try {
646		q.toArray(new String[10]);
647		shouldThrow();
648		} catch (ArrayStoreException success) {}
649		}
650
660	–
651		/**
652		* iterator iterates through all elements
653		*/
654		public void testIterator() throws InterruptedException {
655	<	LinkedBlockingQueue q = populatedQueue(SIZE);
656	<	Iterator it = q.iterator();
657	<	while (it.hasNext()) {
658	<	assertEquals(it.next(), q.take());
659	<	}
655	>	LinkedBlockingQueue<Item> q = populatedQueue(SIZE);
656	>	Iterator<? extends Item> it = q.iterator();
657	>	int i;
658	>	for (i = 0; it.hasNext(); i++)
659	>	mustContain(q, it.next());
660	>	mustEqual(i, SIZE);
661	>	assertIteratorExhausted(it);
662	>
663	>	it = q.iterator();
664	>	for (i = 0; it.hasNext(); i++)
665	>	mustEqual(it.next(), q.take());
666	>	mustEqual(i, SIZE);
667	>	assertIteratorExhausted(it);
668	>	}
669	>
670	>	/**
671	>	* iterator of empty collection has no elements
672	>	*/
673	>	public void testEmptyIterator() {
674	>	assertIteratorExhausted(new LinkedBlockingQueue<Item>().iterator());
675		}
676
677		/**
678		* iterator.remove removes current element
679		*/
680		public void testIteratorRemove() {
681	<	final LinkedBlockingQueue q = new LinkedBlockingQueue(3);
681	>	final LinkedBlockingQueue<Item> q = new LinkedBlockingQueue<>(3);
682		q.add(two);
683		q.add(one);
684		q.add(three);
685
686	<	Iterator it = q.iterator();
686	>	Iterator<? extends Item> it = q.iterator();
687		it.next();
688		it.remove();
689
#	Line 688 | Line 693 | public class LinkedBlockingQueueTest ext
693		assertFalse(it.hasNext());
694		}
695
691	–
696		/**
697		* iterator ordering is FIFO
698		*/
699		public void testIteratorOrdering() {
700	<	final LinkedBlockingQueue q = new LinkedBlockingQueue(3);
700	>	final LinkedBlockingQueue<Item> q = new LinkedBlockingQueue<>(3);
701		q.add(one);
702		q.add(two);
703		q.add(three);
704	<	assertEquals(0, q.remainingCapacity());
704	>	mustEqual(0, q.remainingCapacity());
705		int k = 0;
706	<	for (Iterator it = q.iterator(); it.hasNext();) {
707	<	assertEquals(++k, it.next());
706	>	for (Iterator<? extends Item> it = q.iterator(); it.hasNext();) {
707	>	mustEqual(++k, it.next());
708		}
709	<	assertEquals(3, k);
709	>	mustEqual(3, k);
710		}
711
712		/**
713		* Modifications do not cause iterators to fail
714		*/
715		public void testWeaklyConsistentIteration() {
716	<	final LinkedBlockingQueue q = new LinkedBlockingQueue(3);
716	>	final LinkedBlockingQueue<Item> q = new LinkedBlockingQueue<>(3);
717		q.add(one);
718		q.add(two);
719		q.add(three);
720	<	for (Iterator it = q.iterator(); it.hasNext();) {
720	>	for (Iterator<? extends Item> it = q.iterator(); it.hasNext();) {
721		q.remove();
722		it.next();
723		}
724	<	assertEquals(0, q.size());
724	>	mustEqual(0, q.size());
725		}
726
723	–
727		/**
728		* toString contains toStrings of elements
729		*/
730		public void testToString() {
731	<	LinkedBlockingQueue q = populatedQueue(SIZE);
731	>	LinkedBlockingQueue<Item> q = populatedQueue(SIZE);
732		String s = q.toString();
733		for (int i = 0; i < SIZE; ++i) {
734	<	assertTrue(s.indexOf(String.valueOf(i)) >= 0);
734	>	assertTrue(s.contains(String.valueOf(i)));
735		}
736		}
737
735	–
738		/**
739		* offer transfers elements across Executor tasks
740		*/
741		public void testOfferInExecutor() {
742	<	final LinkedBlockingQueue q = new LinkedBlockingQueue(2);
742	>	final LinkedBlockingQueue<Item> q = new LinkedBlockingQueue<>(2);
743		q.add(one);
744		q.add(two);
745	<	ExecutorService executor = Executors.newFixedThreadPool(2);
746	<	executor.execute(new CheckedRunnable() {
747	<	public void realRun() throws InterruptedException {
748	<	assertFalse(q.offer(three));
749	<	assertTrue(q.offer(three, MEDIUM_DELAY_MS, MILLISECONDS));
750	<	assertEquals(0, q.remainingCapacity());
751	<	}});
752	<
753	<	executor.execute(new CheckedRunnable() {
754	<	public void realRun() throws InterruptedException {
755	<	Thread.sleep(SMALL_DELAY_MS);
756	<	assertSame(one, q.take());
757	<	}});
758	<
759	<	joinPool(executor);
745	>	final CheckedBarrier threadsStarted = new CheckedBarrier(2);
746	>	final ExecutorService executor = Executors.newFixedThreadPool(2);
747	>	try (PoolCleaner cleaner = cleaner(executor)) {
748	>	executor.execute(new CheckedRunnable() {
749	>	public void realRun() throws InterruptedException {
750	>	assertFalse(q.offer(three));
751	>	threadsStarted.await();
752	>	assertTrue(q.offer(three, LONG_DELAY_MS, MILLISECONDS));
753	>	mustEqual(0, q.remainingCapacity());
754	>	}});
755	>
756	>	executor.execute(new CheckedRunnable() {
757	>	public void realRun() throws InterruptedException {
758	>	threadsStarted.await();
759	>	assertSame(one, q.take());
760	>	}});
761	>	}
762		}
763
764		/**
765	<	* poll retrieves elements across Executor threads
765	>	* timed poll retrieves elements across Executor threads
766		*/
767		public void testPollInExecutor() {
768	<	final LinkedBlockingQueue q = new LinkedBlockingQueue(2);
769	<	ExecutorService executor = Executors.newFixedThreadPool(2);
770	<	executor.execute(new CheckedRunnable() {
771	<	public void realRun() throws InterruptedException {
772	<	assertNull(q.poll());
773	<	assertSame(one, q.poll(MEDIUM_DELAY_MS, MILLISECONDS));
774	<	assertTrue(q.isEmpty());
775	<	}});
776	<
777	<	executor.execute(new CheckedRunnable() {
778	<	public void realRun() throws InterruptedException {
779	<	Thread.sleep(SMALL_DELAY_MS);
780	<	q.put(one);
781	<	}});
782	<
783	<	joinPool(executor);
768	>	final LinkedBlockingQueue<Item> q = new LinkedBlockingQueue<>(2);
769	>	final CheckedBarrier threadsStarted = new CheckedBarrier(2);
770	>	final ExecutorService executor = Executors.newFixedThreadPool(2);
771	>	try (PoolCleaner cleaner = cleaner(executor)) {
772	>	executor.execute(new CheckedRunnable() {
773	>	public void realRun() throws InterruptedException {
774	>	assertNull(q.poll());
775	>	threadsStarted.await();
776	>	assertSame(one, q.poll(LONG_DELAY_MS, MILLISECONDS));
777	>	checkEmpty(q);
778	>	}});
779	>
780	>	executor.execute(new CheckedRunnable() {
781	>	public void realRun() throws InterruptedException {
782	>	threadsStarted.await();
783	>	q.put(one);
784	>	}});
785	>	}
786		}
787
788		/**
789	<	* A deserialized serialized queue has same elements in same order
789	>	* A deserialized/reserialized queue has same elements in same order
790		*/
791		public void testSerialization() throws Exception {
792	<	LinkedBlockingQueue q = populatedQueue(SIZE);
793	<
788	<	ByteArrayOutputStream bout = new ByteArrayOutputStream(10000);
789	<	ObjectOutputStream out = new ObjectOutputStream(new BufferedOutputStream(bout));
790	<	out.writeObject(q);
791	<	out.close();
792	>	Queue<Item> x = populatedQueue(SIZE);
793	>	Queue<Item> y = serialClone(x);
794
795	<	ByteArrayInputStream bin = new ByteArrayInputStream(bout.toByteArray());
796	<	ObjectInputStream in = new ObjectInputStream(new BufferedInputStream(bin));
797	<	LinkedBlockingQueue r = (LinkedBlockingQueue)in.readObject();
798	<	assertEquals(q.size(), r.size());
799	<	while (!q.isEmpty())
800	<	assertEquals(q.remove(), r.remove());
801	<	}
802	<
803	<	/**
802	<	* drainTo(null) throws NPE
803	<	*/
804	<	public void testDrainToNull() {
805	<	LinkedBlockingQueue q = populatedQueue(SIZE);
806	<	try {
807	<	q.drainTo(null);
808	<	shouldThrow();
809	<	} catch (NullPointerException success) {}
810	<	}
811	<
812	<	/**
813	<	* drainTo(this) throws IAE
814	<	*/
815	<	public void testDrainToSelf() {
816	<	LinkedBlockingQueue q = populatedQueue(SIZE);
817	<	try {
818	<	q.drainTo(q);
819	<	shouldThrow();
820	<	} catch (IllegalArgumentException success) {}
795	>	assertNotSame(x, y);
796	>	mustEqual(x.size(), y.size());
797	>	mustEqual(x.toString(), y.toString());
798	>	assertTrue(Arrays.equals(x.toArray(), y.toArray()));
799	>	while (!x.isEmpty()) {
800	>	assertFalse(y.isEmpty());
801	>	mustEqual(x.remove(), y.remove());
802	>	}
803	>	assertTrue(y.isEmpty());
804		}
805
806		/**
807		* drainTo(c) empties queue into another collection c
808		*/
809		public void testDrainTo() {
810	<	LinkedBlockingQueue q = populatedQueue(SIZE);
811	<	ArrayList l = new ArrayList();
810	>	LinkedBlockingQueue<Item> q = populatedQueue(SIZE);
811	>	ArrayList<Item> l = new ArrayList<>();
812		q.drainTo(l);
813	<	assertEquals(q.size(), 0);
814	<	assertEquals(l.size(), SIZE);
813	>	mustEqual(0, q.size());
814	>	mustEqual(SIZE, l.size());
815		for (int i = 0; i < SIZE; ++i)
816	<	assertEquals(l.get(i), new Integer(i));
816	>	mustEqual(l.get(i), i);
817		q.add(zero);
818		q.add(one);
819		assertFalse(q.isEmpty());
820	<	assertTrue(q.contains(zero));
821	<	assertTrue(q.contains(one));
820	>	mustContain(q, zero);
821	>	mustContain(q, one);
822		l.clear();
823		q.drainTo(l);
824	<	assertEquals(q.size(), 0);
825	<	assertEquals(l.size(), 2);
824	>	mustEqual(0, q.size());
825	>	mustEqual(2, l.size());
826		for (int i = 0; i < 2; ++i)
827	<	assertEquals(l.get(i), new Integer(i));
827	>	mustEqual(l.get(i), i);
828		}
829
830		/**
831		* drainTo empties full queue, unblocking a waiting put.
832		*/
833		public void testDrainToWithActivePut() throws InterruptedException {
834	<	final LinkedBlockingQueue q = populatedQueue(SIZE);
834	>	final LinkedBlockingQueue<Item> q = populatedQueue(SIZE);
835		Thread t = new Thread(new CheckedRunnable() {
836		public void realRun() throws InterruptedException {
837	<	q.put(new Integer(SIZE+1));
837	>	q.put(new Item(SIZE + 1));
838		}});
839
840		t.start();
841	<	ArrayList l = new ArrayList();
841	>	ArrayList<Item> l = new ArrayList<>();
842		q.drainTo(l);
843		assertTrue(l.size() >= SIZE);
844		for (int i = 0; i < SIZE; ++i)
845	<	assertEquals(l.get(i), new Integer(i));
845	>	mustEqual(l.get(i), i);
846		t.join();
847		assertTrue(q.size() + l.size() >= SIZE);
848		}
849
850		/**
868	–	* drainTo(null, n) throws NPE
869	–	*/
870	–	public void testDrainToNullN() {
871	–	LinkedBlockingQueue q = populatedQueue(SIZE);
872	–	try {
873	–	q.drainTo(null, 0);
874	–	shouldThrow();
875	–	} catch (NullPointerException success) {}
876	–	}
877	–
878	–	/**
879	–	* drainTo(this, n) throws IAE
880	–	*/
881	–	public void testDrainToSelfN() {
882	–	LinkedBlockingQueue q = populatedQueue(SIZE);
883	–	try {
884	–	q.drainTo(q, 0);
885	–	shouldThrow();
886	–	} catch (IllegalArgumentException success) {}
887	–	}
888	–
889	–	/**
851		* drainTo(c, n) empties first min(n, size) elements of queue into c
852		*/
853		public void testDrainToN() {
854	<	LinkedBlockingQueue q = new LinkedBlockingQueue();
854	>	LinkedBlockingQueue<Item> q = new LinkedBlockingQueue<>();
855		for (int i = 0; i < SIZE + 2; ++i) {
856		for (int j = 0; j < SIZE; j++)
857	<	assertTrue(q.offer(new Integer(j)));
858	<	ArrayList l = new ArrayList();
857	>	mustOffer(q, j);
858	>	ArrayList<Item> l = new ArrayList<>();
859		q.drainTo(l, i);
860		int k = (i < SIZE) ? i : SIZE;
861	<	assertEquals(l.size(), k);
862	<	assertEquals(q.size(), SIZE-k);
861	>	mustEqual(k, l.size());
862	>	mustEqual(SIZE - k, q.size());
863		for (int j = 0; j < k; ++j)
864	<	assertEquals(l.get(j), new Integer(j));
865	<	while (q.poll() != null) ;
864	>	mustEqual(l.get(j), j);
865	>	do {} while (q.poll() != null);
866	>	}
867	>	}
868	>
869	>	/**
870	>	* remove(null), contains(null) always return false
871	>	*/
872	>	public void testNeverContainsNull() {
873	>	Collection<?>[] qs = {
874	>	new LinkedBlockingQueue<>(),
875	>	populatedQueue(2),
876	>	};
877	>
878	>	for (Collection<?> q : qs) {
879	>	assertFalse(q.contains(null));
880	>	assertFalse(q.remove(null));
881		}
882		}
883

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