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

Comparing jsr166/src/test/tck/PriorityBlockingQueueTest.java (file contents):
Revision 1.2 by dl, Sun Sep 7 20:39:11 2003 UTC vs.
Revision 1.87 by jsr166, Wed Jan 27 02:55:18 2021 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.*;
13	<
14	<	public class PriorityBlockingQueueTest extends TestCase {
15	<
16	<	private static final int N = 10;
17	<	private static final long SHORT_DELAY_MS = 100;
18	<	private static final long MEDIUM_DELAY_MS = 1000;
19	<	private static final long LONG_DELAY_MS = 10000;
20	<	private static final int NOCAP = Integer.MAX_VALUE;
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.Comparator;
15	>	import java.util.Iterator;
16	>	import java.util.NoSuchElementException;
17	>	import java.util.Queue;
18	>	import java.util.concurrent.BlockingQueue;
19	>	import java.util.concurrent.CountDownLatch;
20	>	import java.util.concurrent.Executors;
21	>	import java.util.concurrent.ExecutorService;
22	>	import java.util.concurrent.PriorityBlockingQueue;
23	>	import java.util.concurrent.ThreadLocalRandom;
24	>
25	>	import junit.framework.Test;
26	>
27	>	public class PriorityBlockingQueueTest extends JSR166TestCase {
28	>
29	>	public static class Generic extends BlockingQueueTest {
30	>	protected BlockingQueue emptyCollection() {
31	>	return new PriorityBlockingQueue();
32	>	}
33	>	}
34	>
35	>	public static class InitialCapacity extends BlockingQueueTest {
36	>	protected BlockingQueue emptyCollection() {
37	>	ThreadLocalRandom rnd = ThreadLocalRandom.current();
38	>	int initialCapacity = rnd.nextInt(1, SIZE);
39	>	return new PriorityBlockingQueue(initialCapacity);
40	>	}
41	>	}
42
43		public static void main(String[] args) {
44	<	junit.textui.TestRunner.run (suite());
44	>	main(suite(), args);
45		}
46
47		public static Test suite() {
48	<	return new TestSuite(PriorityBlockingQueueTest.class);
48	>	class Implementation implements CollectionImplementation {
49	>	public Class<?> klazz() { return PriorityBlockingQueue.class; }
50	>	public Collection emptyCollection() {
51	>	return new PriorityBlockingQueue();
52	>	}
53	>	public Object makeElement(int i) { return JSR166TestCase.itemFor(i); }
54	>	public boolean isConcurrent() { return true; }
55	>	public boolean permitsNulls() { return false; }
56	>	}
57	>	class ComparatorImplementation implements CollectionImplementation {
58	>	public Class<?> klazz() { return PriorityBlockingQueue.class; }
59	>	@SuppressWarnings("unchecked")
60	>	public Collection emptyCollection() {
61	>	ThreadLocalRandom rnd = ThreadLocalRandom.current();
62	>	int initialCapacity = rnd.nextInt(1, 10);
63	>	return new PriorityBlockingQueue(
64	>	initialCapacity, new MyReverseComparator());
65	>	}
66	>	public Object makeElement(int i) { return JSR166TestCase.itemFor(i); }
67	>	public boolean isConcurrent() { return true; }
68	>	public boolean permitsNulls() { return false; }
69	>	}
70	>	return newTestSuite(
71	>	PriorityBlockingQueueTest.class,
72	>	new Generic().testSuite(),
73	>	new InitialCapacity().testSuite(),
74	>	CollectionTest.testSuite(new Implementation()),
75	>	CollectionTest.testSuite(new ComparatorImplementation()));
76		}
77
78	<	static class MyReverseComparator implements Comparator {
78	>	/** Sample Comparator */
79	>	static class MyReverseComparator implements Comparator, java.io.Serializable {
80	>	@SuppressWarnings("unchecked")
81		public int compare(Object x, Object y) {
82	<	int i = ((Integer)x).intValue();
32	<	int j = ((Integer)y).intValue();
33	<	if (i < j) return 1;
34	<	if (i > j) return -1;
35	<	return 0;
82	>	return ((Comparable)y).compareTo(x);
83		}
84		}
85
39	–
86		/**
87	<	* Create a queue of given size containing consecutive
88	<	* Integers 0 ... n.
87	>	* Returns a new queue of given size containing consecutive
88	>	* Items 0 ... n - 1.
89		*/
90	<	private PriorityBlockingQueue fullQueue(int n) {
91	<	PriorityBlockingQueue q = new PriorityBlockingQueue(n);
90	>	private static PriorityBlockingQueue<Item> populatedQueue(int n) {
91	>	PriorityBlockingQueue<Item> q = new PriorityBlockingQueue<>(n);
92		assertTrue(q.isEmpty());
93	<	for(int i = n-1; i >= 0; i-=2)
94	<	assertTrue(q.offer(new Integer(i)));
95	<	for(int i = (n & 1); i < n; i+=2)
96	<	assertTrue(q.offer(new Integer(i)));
93	>	for (int i = n - 1; i >= 0; i -= 2)
94	>	mustOffer(q, i);
95	>	for (int i = (n & 1); i < n; i += 2)
96	>	mustOffer(q, i);
97		assertFalse(q.isEmpty());
98	<	assertEquals(NOCAP, q.remainingCapacity());
99	<	assertEquals(n, q.size());
98	>	mustEqual(Integer.MAX_VALUE, q.remainingCapacity());
99	>	mustEqual(n, q.size());
100	>	mustEqual(0, q.peek());
101		return q;
102		}
103	<
104	<	public void testConstructor1(){
105	<	assertEquals(NOCAP, new PriorityBlockingQueue(N).remainingCapacity());
103	>
104	>	/**
105	>	* A new queue has unbounded capacity
106	>	*/
107	>	public void testConstructor1() {
108	>	mustEqual(Integer.MAX_VALUE,
109	>	new PriorityBlockingQueue<Item>(SIZE).remainingCapacity());
110		}
111
112	<	public void testConstructor2(){
112	>	/**
113	>	* Constructor throws IllegalArgumentException if capacity argument nonpositive
114	>	*/
115	>	public void testConstructor2() {
116		try {
117	<	PriorityBlockingQueue q = new PriorityBlockingQueue(0);
118	<	fail("Cannot make zero-sized");
119	<	}
66	<	catch (IllegalArgumentException success) {}
117	>	new PriorityBlockingQueue<Item>(0);
118	>	shouldThrow();
119	>	} catch (IllegalArgumentException success) {}
120		}
121
122	<	public void testConstructor3(){
123	<
122	>	/**
123	>	* Initializing from null Collection throws NPE
124	>	*/
125	>	public void testConstructor3() {
126		try {
127	<	PriorityBlockingQueue q = new PriorityBlockingQueue(null);
128	<	fail("Cannot make from null collection");
129	<	}
75	<	catch (NullPointerException success) {}
127	>	new PriorityBlockingQueue<Item>(null);
128	>	shouldThrow();
129	>	} catch (NullPointerException success) {}
130		}
131
132	<	public void testConstructor4(){
132	>	/**
133	>	* Initializing from Collection of null elements throws NPE
134	>	*/
135	>	public void testConstructor4() {
136	>	Collection<Item> elements = Arrays.asList(new Item[SIZE]);
137		try {
138	<	Integer[] ints = new Integer[N];
139	<	PriorityBlockingQueue q = new PriorityBlockingQueue(Arrays.asList(ints));
140	<	fail("Cannot make with null elements");
83	<	}
84	<	catch (NullPointerException success) {}
138	>	new PriorityBlockingQueue<Item>(elements);
139	>	shouldThrow();
140	>	} catch (NullPointerException success) {}
141		}
142
143	<	public void testConstructor5(){
144	<	try {
145	<	Integer[] ints = new Integer[N];
146	<	for (int i = 0; i < N-1; ++i)
147	<	ints[i] = new Integer(i);
148	<	PriorityBlockingQueue q = new PriorityBlockingQueue(Arrays.asList(ints));
149	<	fail("Cannot make with null elements");
150	<	}
151	<	catch (NullPointerException success) {}
143	>	/**
144	>	* Initializing from Collection with some null elements throws NPE
145	>	*/
146	>	public void testConstructor5() {
147	>	Item[] items = new Item[2]; items[0] = zero;
148	>	Collection<Item> elements = Arrays.asList(items);
149	>	try {
150	>	new PriorityBlockingQueue<Item>(elements);
151	>	shouldThrow();
152	>	} catch (NullPointerException success) {}
153		}
154
155	<	public void testConstructor6(){
156	<	try {
157	<	Integer[] ints = new Integer[N];
158	<	for (int i = 0; i < N; ++i)
159	<	ints[i] = new Integer(i);
160	<	PriorityBlockingQueue q = new PriorityBlockingQueue(Arrays.asList(ints));
161	<	for (int i = 0; i < N; ++i)
162	<	assertEquals(ints[i], q.poll());
106	<	}
107	<	finally {}
155	>	/**
156	>	* Queue contains all elements of collection used to initialize
157	>	*/
158	>	public void testConstructor6() {
159	>	Item[] items = defaultItems;
160	>	PriorityBlockingQueue<Item> q = new PriorityBlockingQueue<>(Arrays.asList(items));
161	>	for (int i = 0; i < SIZE; ++i)
162	>	mustEqual(items[i], q.poll());
163		}
164
165	<	public void testConstructor7(){
166	<	try {
167	<	PriorityBlockingQueue q = new PriorityBlockingQueue(N, new MyReverseComparator());
168	<	Integer[] ints = new Integer[N];
169	<	for (int i = 0; i < N; ++i)
170	<	ints[i] = new Integer(i);
171	<	q.addAll(Arrays.asList(ints));
172	<	for (int i = N-1; i >= 0; --i)
173	<	assertEquals(ints[i], q.poll());
174	<	}
175	<	finally {}
165	>	/**
166	>	* The comparator used in constructor is used
167	>	*/
168	>	public void testConstructor7() {
169	>	MyReverseComparator cmp = new MyReverseComparator();
170	>	@SuppressWarnings("unchecked")
171	>	PriorityBlockingQueue<Item> q = new PriorityBlockingQueue<>(SIZE, cmp);
172	>	mustEqual(cmp, q.comparator());
173	>	Item[] items = defaultItems;
174	>	q.addAll(Arrays.asList(items));
175	>	for (int i = SIZE - 1; i >= 0; --i)
176	>	mustEqual(items[i], q.poll());
177		}
178
179	+	/**
180	+	* isEmpty is true before add, false after
181	+	*/
182		public void testEmpty() {
183	<	PriorityBlockingQueue q = new PriorityBlockingQueue(2);
183	>	PriorityBlockingQueue<Item> q = new PriorityBlockingQueue<>(2);
184		assertTrue(q.isEmpty());
185	<	assertEquals(NOCAP, q.remainingCapacity());
186	<	q.add(new Integer(1));
185	>	mustEqual(Integer.MAX_VALUE, q.remainingCapacity());
186	>	q.add(one);
187		assertFalse(q.isEmpty());
188	<	q.add(new Integer(2));
188	>	q.add(two);
189		q.remove();
190		q.remove();
191		assertTrue(q.isEmpty());
192		}
193
194	<	public void testRemainingCapacity(){
195	<	PriorityBlockingQueue q = fullQueue(N);
196	<	for (int i = 0; i < N; ++i) {
197	<	assertEquals(NOCAP, q.remainingCapacity());
198	<	assertEquals(N-i, q.size());
199	<	q.remove();
200	<	}
201	<	for (int i = 0; i < N; ++i) {
202	<	assertEquals(NOCAP, q.remainingCapacity());
203	<	assertEquals(i, q.size());
204	<	q.add(new Integer(i));
194	>	/**
195	>	* remainingCapacity() always returns Integer.MAX_VALUE
196	>	*/
197	>	public void testRemainingCapacity() {
198	>	BlockingQueue<Item> q = populatedQueue(SIZE);
199	>	for (int i = 0; i < SIZE; ++i) {
200	>	mustEqual(Integer.MAX_VALUE, q.remainingCapacity());
201	>	mustEqual(SIZE - i, q.size());
202	>	mustEqual(i, q.remove());
203	>	}
204	>	for (int i = 0; i < SIZE; ++i) {
205	>	mustEqual(Integer.MAX_VALUE, q.remainingCapacity());
206	>	mustEqual(i, q.size());
207	>	mustAdd(q, i);
208		}
209		}
210
211	<	public void testOfferNull(){
212	<	try {
213	<	PriorityBlockingQueue q = new PriorityBlockingQueue(1);
152	<	q.offer(null);
153	<	fail("should throw NPE");
154	<	} catch (NullPointerException success) { }
155	<	}
156	<
211	>	/**
212	>	* Offer of comparable element succeeds
213	>	*/
214		public void testOffer() {
215	<	PriorityBlockingQueue q = new PriorityBlockingQueue(1);
216	<	assertTrue(q.offer(new Integer(0)));
217	<	assertTrue(q.offer(new Integer(1)));
215	>	PriorityBlockingQueue<Item> q = new PriorityBlockingQueue<>(1);
216	>	assertTrue(q.offer(zero));
217	>	assertTrue(q.offer(one));
218		}
219
220	+	/**
221	+	* Offer of non-Comparable throws CCE
222	+	*/
223		public void testOfferNonComparable() {
224	+	PriorityBlockingQueue<Object> q = new PriorityBlockingQueue<>(1);
225		try {
165	–	PriorityBlockingQueue q = new PriorityBlockingQueue(1);
166	–	q.offer(new Object());
167	–	q.offer(new Object());
226		q.offer(new Object());
227	<	fail("should throw CCE");
227	>	shouldThrow();
228	>	} catch (ClassCastException success) {
229	>	assertTrue(q.isEmpty());
230	>	mustEqual(0, q.size());
231	>	assertNull(q.poll());
232		}
171	–	catch(ClassCastException success) {}
233		}
234
235	<	public void testAdd(){
236	<	PriorityBlockingQueue q = new PriorityBlockingQueue(N);
237	<	for (int i = 0; i < N; ++i) {
238	<	assertEquals(i, q.size());
239	<	assertTrue(q.add(new Integer(i)));
235	>	/**
236	>	* add of comparable succeeds
237	>	*/
238	>	public void testAdd() {
239	>	PriorityBlockingQueue<Item> q = new PriorityBlockingQueue<>(SIZE);
240	>	for (int i = 0; i < SIZE; ++i) {
241	>	mustEqual(i, q.size());
242	>	mustAdd(q, i);
243		}
244		}
245
246	<	public void testAddAll1(){
246	>	/**
247	>	* addAll(this) throws IllegalArgumentException
248	>	*/
249	>	public void testAddAllSelf() {
250	>	PriorityBlockingQueue<Item> q = populatedQueue(SIZE);
251		try {
252	<	PriorityBlockingQueue q = new PriorityBlockingQueue(1);
253	<	q.addAll(null);
254	<	fail("Cannot add null collection");
187	<	}
188	<	catch (NullPointerException success) {}
252	>	q.addAll(q);
253	>	shouldThrow();
254	>	} catch (IllegalArgumentException success) {}
255		}
256	<	public void testAddAll2(){
257	<	try {
258	<	PriorityBlockingQueue q = new PriorityBlockingQueue(N);
259	<	Integer[] ints = new Integer[N];
260	<	q.addAll(Arrays.asList(ints));
261	<	fail("Cannot add null elements");
262	<	}
263	<	catch (NullPointerException success) {}
256	>
257	>	/**
258	>	* addAll of a collection with any null elements throws NPE after
259	>	* possibly adding some elements
260	>	*/
261	>	public void testAddAll3() {
262	>	PriorityBlockingQueue<Item> q = new PriorityBlockingQueue<>(SIZE);
263	>	Item[] items = new Item[2];
264	>	items[0] = zero;
265	>	try {
266	>	q.addAll(Arrays.asList(items));
267	>	shouldThrow();
268	>	} catch (NullPointerException success) {}
269		}
270	<	public void testAddAll3(){
271	<	try {
272	<	PriorityBlockingQueue q = new PriorityBlockingQueue(N);
273	<	Integer[] ints = new Integer[N];
274	<	for (int i = 0; i < N-1; ++i)
275	<	ints[i] = new Integer(i);
276	<	q.addAll(Arrays.asList(ints));
277	<	fail("Cannot add null elements");
278	<	}
279	<	catch (NullPointerException success) {}
270	>
271	>	/**
272	>	* Queue contains all elements of successful addAll
273	>	*/
274	>	public void testAddAll5() {
275	>	Item[] empty = new Item[0];
276	>	Item[] items = defaultItems;
277	>	PriorityBlockingQueue<Item> q = new PriorityBlockingQueue<>(SIZE);
278	>	assertFalse(q.addAll(Arrays.asList(empty)));
279	>	assertTrue(q.addAll(Arrays.asList(items)));
280	>	for (int i = 0; i < SIZE; ++i)
281	>	mustEqual(items[i], q.poll());
282		}
283
284	<	public void testAddAll5(){
285	<	try {
286	<	Integer[] empty = new Integer[0];
287	<	Integer[] ints = new Integer[N];
288	<	for (int i = N-1; i >= 0; --i)
289	<	ints[i] = new Integer(i);
290	<	PriorityBlockingQueue q = new PriorityBlockingQueue(N);
291	<	assertFalse(q.addAll(Arrays.asList(empty)));
292	<	assertTrue(q.addAll(Arrays.asList(ints)));
220	<	for (int i = 0; i < N; ++i)
221	<	assertEquals(ints[i], q.poll());
222	<	}
223	<	finally {}
224	<	}
225	<
226	<	public void testPutNull() {
227	<	try {
228	<	PriorityBlockingQueue q = new PriorityBlockingQueue(N);
229	<	q.put(null);
230	<	fail("put should throw NPE");
231	<	}
232	<	catch (NullPointerException success){
233	<	}
234	<	}
235	<
236	<	public void testPut() {
237	<	try {
238	<	PriorityBlockingQueue q = new PriorityBlockingQueue(N);
239	<	for (int i = 0; i < N; ++i) {
240	<	Integer I = new Integer(i);
241	<	q.put(I);
242	<	assertTrue(q.contains(I));
243	<	}
244	<	assertEquals(N, q.size());
245	<	}
246	<	finally {
284	>	/**
285	>	* all elements successfully put are contained
286	>	*/
287	>	public void testPut() {
288	>	PriorityBlockingQueue<Item> q = new PriorityBlockingQueue<>(SIZE);
289	>	for (int i = 0; i < SIZE; ++i) {
290	>	Item x = itemFor(i);
291	>	q.put(x);
292	>	mustContain(q, x);
293		}
294	+	mustEqual(SIZE, q.size());
295		}
296
297	<	public void testPutWithTake() {
298	<	final PriorityBlockingQueue q = new PriorityBlockingQueue(2);
299	<	Thread t = new Thread(new Runnable() {
300	<	public void run(){
301	<	int added = 0;
302	<	try {
303	<	q.put(new Integer(0));
304	<	++added;
305	<	q.put(new Integer(0));
306	<	++added;
307	<	q.put(new Integer(0));
308	<	++added;
309	<	q.put(new Integer(0));
310	<	++added;
311	<	assertTrue(added == 4);
265	<	} finally {
266	<	}
267	<	}
268	<	});
269	<	try {
270	<	t.start();
271	<	Thread.sleep(SHORT_DELAY_MS);
272	<	q.take();
273	<	t.interrupt();
274	<	t.join();
275	<	} catch (Exception e){
276	<	fail("Unexpected exception");
277	<	}
297	>	/**
298	>	* put doesn't block waiting for take
299	>	*/
300	>	public void testPutWithTake() throws InterruptedException {
301	>	final PriorityBlockingQueue<Item> q = new PriorityBlockingQueue<>(2);
302	>	final int size = 4;
303	>	Thread t = newStartedThread(new CheckedRunnable() {
304	>	public void realRun() {
305	>	for (int i = 0; i < size; i++)
306	>	q.put(zero);
307	>	}});
308	>
309	>	awaitTermination(t);
310	>	mustEqual(size, q.size());
311	>	q.take();
312		}
313
314	+	/**
315	+	* Queue is unbounded, so timed offer never times out
316	+	*/
317		public void testTimedOffer() {
318	<	final PriorityBlockingQueue q = new PriorityBlockingQueue(2);
319	<	Thread t = new Thread(new Runnable() {
320	<	public void run(){
321	<	try {
322	<	q.put(new Integer(0));
323	<	q.put(new Integer(0));
324	<	assertTrue(q.offer(new Integer(0), SHORT_DELAY_MS/2, TimeUnit.MILLISECONDS));
325	<	assertTrue(q.offer(new Integer(0), LONG_DELAY_MS, TimeUnit.MILLISECONDS));
289	<	} finally { }
290	<	}
291	<	});
292	<
293	<	try {
294	<	t.start();
295	<	Thread.sleep(SHORT_DELAY_MS);
296	<	t.interrupt();
297	<	t.join();
298	<	} catch (Exception e){
299	<	fail("Unexpected exception");
300	<	}
301	<	}
318	>	final PriorityBlockingQueue<Item> q = new PriorityBlockingQueue<>(2);
319	>	Thread t = newStartedThread(new CheckedRunnable() {
320	>	public void realRun() {
321	>	q.put(one);
322	>	q.put(two);
323	>	assertTrue(q.offer(zero, SHORT_DELAY_MS, MILLISECONDS));
324	>	assertTrue(q.offer(zero, LONG_DELAY_MS, MILLISECONDS));
325	>	}});
326
327	<	public void testTake(){
304	<	try {
305	<	PriorityBlockingQueue q = fullQueue(N);
306	<	for (int i = 0; i < N; ++i) {
307	<	assertEquals(i, ((Integer)q.take()).intValue());
308	<	}
309	<	} catch (InterruptedException e){
310	<	fail("Unexpected exception");
311	<	}
327	>	awaitTermination(t);
328		}
329
330	<	public void testTakeFromEmpty() {
331	<	final PriorityBlockingQueue q = new PriorityBlockingQueue(2);
332	<	Thread t = new Thread(new Runnable() {
333	<	public void run(){
334	<	try {
335	<	q.take();
336	<	fail("Should block");
321	<	} catch (InterruptedException success){ }
322	<	}
323	<	});
324	<	try {
325	<	t.start();
326	<	Thread.sleep(SHORT_DELAY_MS);
327	<	t.interrupt();
328	<	t.join();
329	<	} catch (Exception e){
330	<	fail("Unexpected exception");
330	>	/**
331	>	* take retrieves elements in priority order
332	>	*/
333	>	public void testTake() throws InterruptedException {
334	>	PriorityBlockingQueue<Item> q = populatedQueue(SIZE);
335	>	for (int i = 0; i < SIZE; ++i) {
336	>	mustEqual(i, q.take());
337		}
338		}
339
340	<	public void testBlockingTake(){
341	<	Thread t = new Thread(new Runnable() {
342	<	public void run() {
343	<	try {
344	<	PriorityBlockingQueue q = fullQueue(N);
345	<	for (int i = 0; i < N; ++i) {
346	<	assertEquals(i, ((Integer)q.take()).intValue());
347	<	}
348	<	q.take();
343	<	fail("take should block");
344	<	} catch (InterruptedException success){
345	<	}
346	<	}});
347	<	t.start();
348	<	try {
349	<	Thread.sleep(SHORT_DELAY_MS);
350	<	t.interrupt();
351	<	t.join();
352	<	}
353	<	catch (InterruptedException ie) {
354	<	fail("Unexpected exception");
355	<	}
356	<	}
340	>	/**
341	>	* Take removes existing elements until empty, then blocks interruptibly
342	>	*/
343	>	public void testBlockingTake() throws InterruptedException {
344	>	final PriorityBlockingQueue<Item> q = populatedQueue(SIZE);
345	>	final CountDownLatch pleaseInterrupt = new CountDownLatch(1);
346	>	Thread t = newStartedThread(new CheckedRunnable() {
347	>	public void realRun() throws InterruptedException {
348	>	for (int i = 0; i < SIZE; i++) mustEqual(i, q.take());
349
350	+	Thread.currentThread().interrupt();
351	+	try {
352	+	q.take();
353	+	shouldThrow();
354	+	} catch (InterruptedException success) {}
355	+	assertFalse(Thread.interrupted());
356
357	<	public void testPoll(){
358	<	PriorityBlockingQueue q = fullQueue(N);
359	<	for (int i = 0; i < N; ++i) {
360	<	assertEquals(i, ((Integer)q.poll()).intValue());
361	<	}
362	<	assertNull(q.poll());
357	>	pleaseInterrupt.countDown();
358	>	try {
359	>	q.take();
360	>	shouldThrow();
361	>	} catch (InterruptedException success) {}
362	>	assertFalse(Thread.interrupted());
363	>	}});
364	>
365	>	await(pleaseInterrupt);
366	>	if (randomBoolean()) assertThreadBlocks(t, Thread.State.WAITING);
367	>	t.interrupt();
368	>	awaitTermination(t);
369		}
370
371	<	public void testTimedPoll0() {
372	<	try {
373	<	PriorityBlockingQueue q = fullQueue(N);
374	<	for (int i = 0; i < N; ++i) {
375	<	assertEquals(i, ((Integer)q.poll(0, TimeUnit.MILLISECONDS)).intValue());
376	<	}
377	<	assertNull(q.poll(0, TimeUnit.MILLISECONDS));
378	<	} catch (InterruptedException e){
379	<	fail("Unexpected exception");
376	<	}
371	>	/**
372	>	* poll succeeds unless empty
373	>	*/
374	>	public void testPoll() {
375	>	PriorityBlockingQueue<Item> q = populatedQueue(SIZE);
376	>	for (int i = 0; i < SIZE; ++i) {
377	>	mustEqual(i, q.poll());
378	>	}
379	>	assertNull(q.poll());
380		}
381
382	<	public void testTimedPoll() {
383	<	try {
384	<	PriorityBlockingQueue q = fullQueue(N);
385	<	for (int i = 0; i < N; ++i) {
386	<	assertEquals(i, ((Integer)q.poll(SHORT_DELAY_MS, TimeUnit.MILLISECONDS)).intValue());
387	<	}
388	<	assertNull(q.poll(SHORT_DELAY_MS, TimeUnit.MILLISECONDS));
386	<	} catch (InterruptedException e){
387	<	fail("Unexpected exception");
388	<	}
389	<	}
390	<
391	<	public void testInterruptedTimedPoll(){
392	<	Thread t = new Thread(new Runnable() {
393	<	public void run() {
394	<	try {
395	<	PriorityBlockingQueue q = fullQueue(N);
396	<	for (int i = 0; i < N; ++i) {
397	<	assertEquals(i, ((Integer)q.poll(SHORT_DELAY_MS, TimeUnit.MILLISECONDS)).intValue());
398	<	}
399	<	assertNull(q.poll(SHORT_DELAY_MS, TimeUnit.MILLISECONDS));
400	<	} catch (InterruptedException success){
401	<	}
402	<	}});
403	<	t.start();
404	<	try {
405	<	Thread.sleep(SHORT_DELAY_MS);
406	<	t.interrupt();
407	<	t.join();
408	<	}
409	<	catch (InterruptedException ie) {
410	<	fail("Unexpected exception");
382	>	/**
383	>	* timed poll with zero timeout succeeds when non-empty, else times out
384	>	*/
385	>	public void testTimedPoll0() throws InterruptedException {
386	>	PriorityBlockingQueue<Item> q = populatedQueue(SIZE);
387	>	for (int i = 0; i < SIZE; ++i) {
388	>	mustEqual(i, q.poll(0, MILLISECONDS));
389		}
390	+	assertNull(q.poll(0, MILLISECONDS));
391		}
392
393	<	public void testTimedPollWithOffer(){
394	<	final PriorityBlockingQueue q = new PriorityBlockingQueue(2);
395	<	Thread t = new Thread(new Runnable() {
396	<	public void run(){
397	<	try {
398	<	assertNull(q.poll(SHORT_DELAY_MS, TimeUnit.MILLISECONDS));
399	<	q.poll(LONG_DELAY_MS, TimeUnit.MILLISECONDS);
400	<	q.poll(LONG_DELAY_MS, TimeUnit.MILLISECONDS);
401	<	fail("Should block");
402	<	} catch (InterruptedException success) { }
403	<	}
404	<	});
405	<	try {
406	<	t.start();
407	<	Thread.sleep(SHORT_DELAY_MS * 2);
429	<	assertTrue(q.offer(new Integer(0), SHORT_DELAY_MS, TimeUnit.MILLISECONDS));
430	<	t.interrupt();
431	<	t.join();
432	<	} catch (Exception e){
433	<	fail("Unexpected exception");
434	<	}
435	<	}
393	>	/**
394	>	* timed poll with nonzero timeout succeeds when non-empty, else times out
395	>	*/
396	>	public void testTimedPoll() throws InterruptedException {
397	>	PriorityBlockingQueue<Item> q = populatedQueue(SIZE);
398	>	for (int i = 0; i < SIZE; ++i) {
399	>	long startTime = System.nanoTime();
400	>	mustEqual(i, q.poll(LONG_DELAY_MS, MILLISECONDS));
401	>	assertTrue(millisElapsedSince(startTime) < LONG_DELAY_MS);
402	>	}
403	>	long startTime = System.nanoTime();
404	>	assertNull(q.poll(timeoutMillis(), MILLISECONDS));
405	>	assertTrue(millisElapsedSince(startTime) >= timeoutMillis());
406	>	checkEmpty(q);
407	>	}
408
409	+	/**
410	+	* Interrupted timed poll throws InterruptedException instead of
411	+	* returning timeout status
412	+	*/
413	+	public void testInterruptedTimedPoll() throws InterruptedException {
414	+	final BlockingQueue<Item> q = populatedQueue(SIZE);
415	+	final CountDownLatch pleaseInterrupt = new CountDownLatch(1);
416	+	Thread t = newStartedThread(new CheckedRunnable() {
417	+	public void realRun() throws InterruptedException {
418	+	for (int i = 0; i < SIZE; i++)
419	+	mustEqual(i, q.poll(LONG_DELAY_MS, MILLISECONDS));
420
421	<	public void testPeek(){
422	<	PriorityBlockingQueue q = fullQueue(N);
423	<	for (int i = 0; i < N; ++i) {
424	<	assertEquals(i, ((Integer)q.peek()).intValue());
425	<	q.poll();
421	>	Thread.currentThread().interrupt();
422	>	try {
423	>	q.poll(randomTimeout(), randomTimeUnit());
424	>	shouldThrow();
425	>	} catch (InterruptedException success) {}
426	>	assertFalse(Thread.interrupted());
427	>
428	>	pleaseInterrupt.countDown();
429	>	try {
430	>	q.poll(LONGER_DELAY_MS, MILLISECONDS);
431	>	shouldThrow();
432	>	} catch (InterruptedException success) {}
433	>	assertFalse(Thread.interrupted());
434	>	}});
435	>
436	>	await(pleaseInterrupt);
437	>	if (randomBoolean()) assertThreadBlocks(t, Thread.State.TIMED_WAITING);
438	>	t.interrupt();
439	>	awaitTermination(t);
440	>	}
441	>
442	>	/**
443	>	* peek returns next element, or null if empty
444	>	*/
445	>	public void testPeek() {
446	>	PriorityBlockingQueue<Item> q = populatedQueue(SIZE);
447	>	for (int i = 0; i < SIZE; ++i) {
448	>	mustEqual(i, q.peek());
449	>	mustEqual(i, q.poll());
450		assertTrue(q.peek() == null ||
451	<	i != ((Integer)q.peek()).intValue());
451	>	!q.peek().equals(i));
452		}
453	<	assertNull(q.peek());
453	>	assertNull(q.peek());
454		}
455
456	<	public void testElement(){
457	<	PriorityBlockingQueue q = fullQueue(N);
458	<	for (int i = 0; i < N; ++i) {
459	<	assertEquals(i, ((Integer)q.element()).intValue());
460	<	q.poll();
456	>	/**
457	>	* element returns next element, or throws NSEE if empty
458	>	*/
459	>	public void testElement() {
460	>	PriorityBlockingQueue<Item> q = populatedQueue(SIZE);
461	>	for (int i = 0; i < SIZE; ++i) {
462	>	mustEqual(i, q.element());
463	>	mustEqual(i, q.poll());
464		}
465		try {
466		q.element();
467	<	fail("no such element");
468	<	}
459	<	catch (NoSuchElementException success) {}
467	>	shouldThrow();
468	>	} catch (NoSuchElementException success) {}
469		}
470
471	<	public void testRemove(){
472	<	PriorityBlockingQueue q = fullQueue(N);
473	<	for (int i = 0; i < N; ++i) {
474	<	assertEquals(i, ((Integer)q.remove()).intValue());
471	>	/**
472	>	* remove removes next element, or throws NSEE if empty
473	>	*/
474	>	public void testRemove() {
475	>	PriorityBlockingQueue<Item> q = populatedQueue(SIZE);
476	>	for (int i = 0; i < SIZE; ++i) {
477	>	mustEqual(i, q.remove());
478		}
479		try {
480		q.remove();
481	<	fail("remove should throw");
482	<	} catch (NoSuchElementException success){
471	<	}
481	>	shouldThrow();
482	>	} catch (NoSuchElementException success) {}
483		}
484
485	<	public void testRemoveElement(){
486	<	PriorityBlockingQueue q = fullQueue(N);
487	<	for (int i = 1; i < N; i+=2) {
488	<	assertTrue(q.remove(new Integer(i)));
489	<	}
490	<	for (int i = 0; i < N; i+=2) {
491	<	assertTrue(q.remove(new Integer(i)));
481	<	assertFalse(q.remove(new Integer(i+1)));
482	<	}
483	<	assertTrue(q.isEmpty());
484	<	}
485	<
486	<	public void testContains(){
487	<	PriorityBlockingQueue q = fullQueue(N);
488	<	for (int i = 0; i < N; ++i) {
489	<	assertTrue(q.contains(new Integer(i)));
485	>	/**
486	>	* contains(x) reports true when elements added but not yet removed
487	>	*/
488	>	public void testContains() {
489	>	PriorityBlockingQueue<Item> q = populatedQueue(SIZE);
490	>	for (int i = 0; i < SIZE; ++i) {
491	>	mustContain(q, i);
492		q.poll();
493	<	assertFalse(q.contains(new Integer(i)));
493	>	mustNotContain(q, i);
494		}
495		}
496
497	<	public void testClear(){
498	<	PriorityBlockingQueue q = fullQueue(N);
497	>	/**
498	>	* clear removes all elements
499	>	*/
500	>	public void testClear() {
501	>	PriorityBlockingQueue<Item> q = populatedQueue(SIZE);
502		q.clear();
503		assertTrue(q.isEmpty());
504	<	assertEquals(0, q.size());
505	<	assertEquals(NOCAP, q.remainingCapacity());
501	<	q.add(new Integer(1));
504	>	mustEqual(0, q.size());
505	>	q.add(one);
506		assertFalse(q.isEmpty());
507	+	mustContain(q, one);
508		q.clear();
509		assertTrue(q.isEmpty());
510		}
511
512	<	public void testContainsAll(){
513	<	PriorityBlockingQueue q = fullQueue(N);
514	<	PriorityBlockingQueue p = new PriorityBlockingQueue(N);
515	<	for (int i = 0; i < N; ++i) {
512	>	/**
513	>	* containsAll(c) is true when c contains a subset of elements
514	>	*/
515	>	public void testContainsAll() {
516	>	PriorityBlockingQueue<Item> q = populatedQueue(SIZE);
517	>	PriorityBlockingQueue<Item> p = new PriorityBlockingQueue<>(SIZE);
518	>	for (int i = 0; i < SIZE; ++i) {
519		assertTrue(q.containsAll(p));
520		assertFalse(p.containsAll(q));
521	<	p.add(new Integer(i));
521	>	mustAdd(p, i);
522		}
523		assertTrue(p.containsAll(q));
524		}
525
526	<	public void testRetainAll(){
527	<	PriorityBlockingQueue q = fullQueue(N);
528	<	PriorityBlockingQueue p = fullQueue(N);
529	<	for (int i = 0; i < N; ++i) {
526	>	/**
527	>	* retainAll(c) retains only those elements of c and reports true if changed
528	>	*/
529	>	public void testRetainAll() {
530	>	PriorityBlockingQueue<Item> q = populatedQueue(SIZE);
531	>	PriorityBlockingQueue<Item> p = populatedQueue(SIZE);
532	>	for (int i = 0; i < SIZE; ++i) {
533		boolean changed = q.retainAll(p);
534		if (i == 0)
535		assertFalse(changed);
#	Line 526 | Line 537 | public class PriorityBlockingQueueTest e
537		assertTrue(changed);
538
539		assertTrue(q.containsAll(p));
540	<	assertEquals(N-i, q.size());
540	>	mustEqual(SIZE - i, q.size());
541		p.remove();
542		}
543		}
544
545	<	public void testRemoveAll(){
546	<	for (int i = 1; i < N; ++i) {
547	<	PriorityBlockingQueue q = fullQueue(N);
548	<	PriorityBlockingQueue p = fullQueue(i);
545	>	/**
546	>	* removeAll(c) removes only those elements of c and reports true if changed
547	>	*/
548	>	public void testRemoveAll() {
549	>	for (int i = 1; i < SIZE; ++i) {
550	>	PriorityBlockingQueue<Item> q = populatedQueue(SIZE);
551	>	PriorityBlockingQueue<Item> p = populatedQueue(i);
552		assertTrue(q.removeAll(p));
553	<	assertEquals(N-i, q.size());
553	>	mustEqual(SIZE - i, q.size());
554		for (int j = 0; j < i; ++j) {
555	<	Integer I = (Integer)(p.remove());
556	<	assertFalse(q.contains(I));
555	>	Item x = p.remove();
556	>	mustNotContain(q, x);
557		}
558		}
559		}
560
561	<	public void testToArray(){
562	<	PriorityBlockingQueue q = fullQueue(N);
563	<	Object[] o = q.toArray();
564	<	Arrays.sort(o);
565	<	try {
566	<	for(int i = 0; i < o.length; i++)
567	<	assertEquals(o[i], q.take());
568	<	} catch (InterruptedException e){
569	<	fail("Unexpected exception");
570	<	}
571	<	}
572	<
573	<	public void testToArray2(){
574	<	PriorityBlockingQueue q = fullQueue(N);
575	<	Integer[] ints = new Integer[N];
576	<	ints = (Integer[])q.toArray(ints);
577	<	Arrays.sort(ints);
578	<	try {
579	<	for(int i = 0; i < ints.length; i++)
580	<	assertEquals(ints[i], q.take());
581	<	} catch (InterruptedException e){
582	<	fail("Unexpected exception");
583	<	}
584	<	}
585	<
586	<	public void testIterator(){
573	<	PriorityBlockingQueue q = fullQueue(N);
574	<	int i = 0;
575	<	Iterator it = q.iterator();
576	<	while(it.hasNext()) {
577	<	assertTrue(q.contains(it.next()));
578	<	++i;
579	<	}
580	<	assertEquals(i, N);
581	<	}
582	<
583	<	public void testIteratorRemove () {
584	<
585	<	final PriorityBlockingQueue q = new PriorityBlockingQueue(3);
586	<
587	<	q.add(new Integer(2));
588	<	q.add(new Integer(1));
589	<	q.add(new Integer(3));
561	>	/**
562	>	* toArray contains all elements
563	>	*/
564	>	public void testToArray() throws InterruptedException {
565	>	PriorityBlockingQueue<Item> q = populatedQueue(SIZE);
566	>	Object[] a = q.toArray();
567	>	assertSame(Object[].class, a.getClass());
568	>	Arrays.sort(a);
569	>	for (Object o : a)
570	>	assertSame(o, q.take());
571	>	assertTrue(q.isEmpty());
572	>	}
573	>
574	>	/**
575	>	* toArray(a) contains all elements
576	>	*/
577	>	public void testToArray2() throws InterruptedException {
578	>	PriorityBlockingQueue<Item> q = populatedQueue(SIZE);
579	>	Item[] items = new Item[SIZE];
580	>	Item[] array = q.toArray(items);
581	>	assertSame(items, array);
582	>	Arrays.sort(items);
583	>	for (Item o : items)
584	>	assertSame(o, q.take());
585	>	assertTrue(q.isEmpty());
586	>	}
587
588	<	Iterator it = q.iterator();
588	>	/**
589	>	* toArray(incompatible array type) throws ArrayStoreException
590	>	*/
591	>	@SuppressWarnings("CollectionToArraySafeParameter")
592	>	public void testToArray_incompatibleArrayType() {
593	>	PriorityBlockingQueue<Item> q = populatedQueue(SIZE);
594	>	try {
595	>	q.toArray(new String[10]);
596	>	shouldThrow();
597	>	} catch (ArrayStoreException success) {}
598	>	}
599	>
600	>	/**
601	>	* iterator iterates through all elements
602	>	*/
603	>	public void testIterator() {
604	>	PriorityBlockingQueue<Item> q = populatedQueue(SIZE);
605	>	Iterator<? extends Item> it = q.iterator();
606	>	int i;
607	>	for (i = 0; it.hasNext(); i++)
608	>	mustContain(q, it.next());
609	>	mustEqual(i, SIZE);
610	>	assertIteratorExhausted(it);
611	>	}
612	>
613	>	/**
614	>	* iterator of empty collection has no elements
615	>	*/
616	>	public void testEmptyIterator() {
617	>	assertIteratorExhausted(new PriorityBlockingQueue<>().iterator());
618	>	}
619	>
620	>	/**
621	>	* iterator.remove removes current element
622	>	*/
623	>	public void testIteratorRemove() {
624	>	final PriorityBlockingQueue<Item> q = new PriorityBlockingQueue<>(3);
625	>	q.add(two);
626	>	q.add(one);
627	>	q.add(three);
628	>
629	>	Iterator<? extends Item> it = q.iterator();
630		it.next();
631		it.remove();
632
633		it = q.iterator();
634	<	assertEquals(it.next(), new Integer(2));
635	<	assertEquals(it.next(), new Integer(3));
634	>	mustEqual(it.next(), two);
635	>	mustEqual(it.next(), three);
636		assertFalse(it.hasNext());
637		}
638
639	<
640	<	public void testToString(){
641	<	PriorityBlockingQueue q = fullQueue(N);
639	>	/**
640	>	* toString contains toStrings of elements
641	>	*/
642	>	public void testToString() {
643	>	PriorityBlockingQueue<Item> q = populatedQueue(SIZE);
644		String s = q.toString();
645	<	for (int i = 0; i < N; ++i) {
646	<	assertTrue(s.indexOf(String.valueOf(i)) >= 0);
645	>	for (int i = 0; i < SIZE; ++i) {
646	>	assertTrue(s.contains(String.valueOf(i)));
647		}
648	<	}
648	>	}
649
650	+	/**
651	+	* timed poll transfers elements across Executor tasks
652	+	*/
653		public void testPollInExecutor() {
654	+	final PriorityBlockingQueue<Item> q = new PriorityBlockingQueue<>(2);
655	+	final CheckedBarrier threadsStarted = new CheckedBarrier(2);
656	+	final ExecutorService executor = Executors.newFixedThreadPool(2);
657	+	try (PoolCleaner cleaner = cleaner(executor)) {
658	+	executor.execute(new CheckedRunnable() {
659	+	public void realRun() throws InterruptedException {
660	+	assertNull(q.poll());
661	+	threadsStarted.await();
662	+	assertSame(one, q.poll(LONG_DELAY_MS, MILLISECONDS));
663	+	checkEmpty(q);
664	+	}});
665
666	<	final PriorityBlockingQueue q = new PriorityBlockingQueue(2);
666	>	executor.execute(new CheckedRunnable() {
667	>	public void realRun() throws InterruptedException {
668	>	threadsStarted.await();
669	>	q.put(one);
670	>	}});
671	>	}
672	>	}
673
674	<	ExecutorService executor = Executors.newFixedThreadPool(2);
674	>	/**
675	>	* A deserialized/reserialized queue has same elements
676	>	*/
677	>	public void testSerialization() throws Exception {
678	>	Queue<Item> x = populatedQueue(SIZE);
679	>	Queue<Item> y = serialClone(x);
680	>
681	>	assertNotSame(x, y);
682	>	mustEqual(x.size(), y.size());
683	>	while (!x.isEmpty()) {
684	>	assertFalse(y.isEmpty());
685	>	mustEqual(x.remove(), y.remove());
686	>	}
687	>	assertTrue(y.isEmpty());
688	>	}
689
690	<	executor.execute(new Runnable() {
691	<	public void run() {
692	<	assertNull("poll should fail", q.poll());
693	<	try {
694	<	assertTrue(null != q.poll(MEDIUM_DELAY_MS * 2, TimeUnit.MILLISECONDS));
695	<	assertTrue(q.isEmpty());
696	<	}
697	<	catch (InterruptedException e) {
698	<	fail("should not be interrupted");
699	<	}
700	<	}
701	<	});
690	>	/**
691	>	* drainTo(c) empties queue into another collection c
692	>	*/
693	>	public void testDrainTo() {
694	>	PriorityBlockingQueue<Item> q = populatedQueue(SIZE);
695	>	ArrayList<Item> l = new ArrayList<>();
696	>	q.drainTo(l);
697	>	mustEqual(0, q.size());
698	>	mustEqual(SIZE, l.size());
699	>	for (int i = 0; i < SIZE; ++i)
700	>	mustEqual(l.get(i), i);
701	>	q.add(zero);
702	>	q.add(one);
703	>	assertFalse(q.isEmpty());
704	>	mustContain(q, one);
705	>	l.clear();
706	>	q.drainTo(l);
707	>	mustEqual(0, q.size());
708	>	mustEqual(2, l.size());
709	>	for (int i = 0; i < 2; ++i)
710	>	mustEqual(l.get(i), i);
711	>	}
712
713	<	executor.execute(new Runnable() {
714	<	public void run() {
715	<	try {
716	<	Thread.sleep(MEDIUM_DELAY_MS);
717	<	q.put(new Integer(1));
718	<	}
719	<	catch (InterruptedException e) {
720	<	fail("should not be interrupted");
721	<	}
638	<	}
639	<	});
640	<
641	<	executor.shutdown();
713	>	/**
714	>	* drainTo empties queue
715	>	*/
716	>	public void testDrainToWithActivePut() throws InterruptedException {
717	>	final PriorityBlockingQueue<Item> q = populatedQueue(SIZE);
718	>	Thread t = new Thread(new CheckedRunnable() {
719	>	public void realRun() {
720	>	q.put(new Item(SIZE + 1));
721	>	}});
722
723	+	t.start();
724	+	ArrayList<Item> l = new ArrayList<>();
725	+	q.drainTo(l);
726	+	assertTrue(l.size() >= SIZE);
727	+	for (int i = 0; i < SIZE; ++i)
728	+	mustEqual(l.get(i), i);
729	+	t.join();
730	+	assertTrue(q.size() + l.size() >= SIZE);
731		}
732
733	<	public void testSerialization() {
734	<	PriorityBlockingQueue q = fullQueue(N);
735	<	try {
736	<	ByteArrayOutputStream bout = new ByteArrayOutputStream(10000);
737	<	ObjectOutputStream out = new ObjectOutputStream(new BufferedOutputStream(bout));
738	<	out.writeObject(q);
739	<	out.close();
740	<
741	<	ByteArrayInputStream bin = new ByteArrayInputStream(bout.toByteArray());
742	<	ObjectInputStream in = new ObjectInputStream(new BufferedInputStream(bin));
743	<	PriorityBlockingQueue r = (PriorityBlockingQueue)in.readObject();
744	<	assertEquals(q.size(), r.size());
745	<	while (!q.isEmpty())
746	<	assertEquals(q.remove(), r.remove());
747	<	} catch(Exception e){
748	<	fail("unexpected exception");
733	>	/**
734	>	* drainTo(c, n) empties first min(n, size) elements of queue into c
735	>	*/
736	>	public void testDrainToN() {
737	>	PriorityBlockingQueue<Item> q = new PriorityBlockingQueue<>(SIZE * 2);
738	>	for (int i = 0; i < SIZE + 2; ++i) {
739	>	for (int j = 0; j < SIZE; j++)
740	>	mustOffer(q, j);
741	>	ArrayList<Item> l = new ArrayList<>();
742	>	q.drainTo(l, i);
743	>	int k = (i < SIZE) ? i : SIZE;
744	>	mustEqual(k, l.size());
745	>	mustEqual(SIZE - k, q.size());
746	>	for (int j = 0; j < k; ++j)
747	>	mustEqual(l.get(j), j);
748	>	do {} while (q.poll() != null);
749	>	}
750	>	}
751	>
752	>	/**
753	>	* remove(null), contains(null) always return false
754	>	*/
755	>	public void testNeverContainsNull() {
756	>	Collection<?>[] qs = {
757	>	new PriorityBlockingQueue<>(),
758	>	populatedQueue(2),
759	>	};
760	>
761	>	for (Collection<?> q : qs) {
762	>	assertFalse(q.contains(null));
763	>	assertFalse(q.remove(null));
764		}
765		}
766

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