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

Comparing jsr166/src/test/tck/DelayQueueTest.java (file contents):
Revision 1.26 by jsr166, Sun Nov 22 18:57:17 2009 UTC vs.
Revision 1.56 by jsr166, Fri Jul 15 18:49:31 2011 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.*;
10	>	import java.util.Arrays;
11	>	import java.util.ArrayList;
12	>	import java.util.Iterator;
13	>	import java.util.NoSuchElementException;
14	>	import java.util.concurrent.BlockingQueue;
15	>	import java.util.concurrent.CountDownLatch;
16	>	import java.util.concurrent.Delayed;
17	>	import java.util.concurrent.DelayQueue;
18	>	import java.util.concurrent.Executors;
19	>	import java.util.concurrent.ExecutorService;
20	>	import java.util.concurrent.TimeUnit;
21		import static java.util.concurrent.TimeUnit.MILLISECONDS;
12	–	import java.util.concurrent.*;
22
23		public class DelayQueueTest extends JSR166TestCase {
24	+
25	+	public static class Generic extends BlockingQueueTest {
26	+	protected BlockingQueue emptyCollection() {
27	+	return new DelayQueue();
28	+	}
29	+	protected PDelay makeElement(int i) {
30	+	return new PDelay(i);
31	+	}
32	+	}
33	+
34		public static void main(String[] args) {
35	<	junit.textui.TestRunner.run (suite());
35	>	junit.textui.TestRunner.run(suite());
36		}
37
38		public static Test suite() {
39	<	return new TestSuite(DelayQueueTest.class);
39	>	return newTestSuite(DelayQueueTest.class,
40	>	new Generic().testSuite());
41		}
42
43		private static final int NOCAP = Integer.MAX_VALUE;
44
45		/**
46		* A delayed implementation for testing.
47	<	* Most  tests use Pseudodelays, where delays are all elapsed
47	>	* Most tests use Pseudodelays, where delays are all elapsed
48		* (so, no blocking solely for delays) but are still ordered
49		*/
50		static class PDelay implements Delayed {
51		int pseudodelay;
52	<	PDelay(int i) { pseudodelay = Integer.MIN_VALUE + i; }
53	<	public int compareTo(PDelay y) {
54	<	int i = pseudodelay;
55	<	int j = ((PDelay)y).pseudodelay;
56	<	if (i < j) return -1;
37	<	if (i > j) return 1;
38	<	return 0;
52	>	PDelay(int i) { pseudodelay = i; }
53	>	public int compareTo(PDelay other) {
54	>	int a = this.pseudodelay;
55	>	int b = other.pseudodelay;
56	>	return (a < b) ? -1 : (a > b) ? 1 : 0;
57		}
40	–
58		public int compareTo(Delayed y) {
59	<	int i = pseudodelay;
43	<	int j = ((PDelay)y).pseudodelay;
44	<	if (i < j) return -1;
45	<	if (i > j) return 1;
46	<	return 0;
59	>	return compareTo((PDelay)y);
60		}
48	–
61		public boolean equals(Object other) {
62	<	return ((PDelay)other).pseudodelay == pseudodelay;
63	<	}
52	<	public boolean equals(PDelay other) {
53	<	return ((PDelay)other).pseudodelay == pseudodelay;
62	>	return (other instanceof PDelay) &&
63	>	this.pseudodelay == ((PDelay)other).pseudodelay;
64		}
55	–
56	–
65		public long getDelay(TimeUnit ignore) {
66	<	return pseudodelay;
59	<	}
60	<	public int intValue() {
61	<	return pseudodelay;
66	>	return Integer.MIN_VALUE + pseudodelay;
67		}
63	–
68		public String toString() {
69		return String.valueOf(pseudodelay);
70		}
71		}
72
69	–
73		/**
74		* Delayed implementation that actually delays
75		*/
#	Line 77 | Line 80 | public class DelayQueueTest extends JSR1
80		}
81		public int compareTo(NanoDelay y) {
82		long i = trigger;
83	<	long j = ((NanoDelay)y).trigger;
83	>	long j = y.trigger;
84		if (i < j) return -1;
85		if (i > j) return 1;
86		return 0;
87		}
88
89		public int compareTo(Delayed y) {
90	<	long i = trigger;
88	<	long j = ((NanoDelay)y).trigger;
89	<	if (i < j) return -1;
90	<	if (i > j) return 1;
91	<	return 0;
90	>	return compareTo((NanoDelay)y);
91		}
92
93		public boolean equals(Object other) {
94	<	return ((NanoDelay)other).trigger == trigger;
94	>	return equals((NanoDelay)other);
95		}
96		public boolean equals(NanoDelay other) {
97	<	return ((NanoDelay)other).trigger == trigger;
97	>	return other.trigger == trigger;
98		}
99
100		public long getDelay(TimeUnit unit) {
#	Line 112 | Line 111 | public class DelayQueueTest extends JSR1
111		}
112		}
113
115	–
114		/**
115		* Create a queue of given size containing consecutive
116		* PDelays 0 ... n.
117		*/
118	<	private DelayQueue populatedQueue(int n) {
119	<	DelayQueue q = new DelayQueue();
118	>	private DelayQueue<PDelay> populatedQueue(int n) {
119	>	DelayQueue<PDelay> q = new DelayQueue<PDelay>();
120		assertTrue(q.isEmpty());
121		for (int i = n-1; i >= 0; i-=2)
122		assertTrue(q.offer(new PDelay(i)));
#	Line 199 | Line 197 | public class DelayQueueTest extends JSR1
197		}
198
199		/**
200	<	* remainingCapacity does not change when elementa added or removed,
200	>	* remainingCapacity does not change when elements added or removed,
201		* but size does
202		*/
203		public void testRemainingCapacity() {
#	Line 217 | Line 215 | public class DelayQueueTest extends JSR1
215		}
216
217		/**
220	–	* offer(null) throws NPE
221	–	*/
222	–	public void testOfferNull() {
223	–	try {
224	–	DelayQueue q = new DelayQueue();
225	–	q.offer(null);
226	–	shouldThrow();
227	–	} catch (NullPointerException success) {}
228	–	}
229	–
230	–	/**
231	–	* add(null) throws NPE
232	–	*/
233	–	public void testAddNull() {
234	–	try {
235	–	DelayQueue q = new DelayQueue();
236	–	q.add(null);
237	–	shouldThrow();
238	–	} catch (NullPointerException success) {}
239	–	}
240	–
241	–	/**
218		* offer non-null succeeds
219		*/
220		public void testOffer() {
#	Line 259 | Line 235 | public class DelayQueueTest extends JSR1
235		}
236
237		/**
262	–	* addAll(null) throws NPE
263	–	*/
264	–	public void testAddAll1() {
265	–	try {
266	–	DelayQueue q = new DelayQueue();
267	–	q.addAll(null);
268	–	shouldThrow();
269	–	} catch (NullPointerException success) {}
270	–	}
271	–
272	–
273	–	/**
238		* addAll(this) throws IAE
239		*/
240		public void testAddAllSelf() {
#	Line 282 | Line 246 | public class DelayQueueTest extends JSR1
246		}
247
248		/**
285	–	* addAll of a collection with null elements throws NPE
286	–	*/
287	–	public void testAddAll2() {
288	–	try {
289	–	DelayQueue q = new DelayQueue();
290	–	PDelay[] ints = new PDelay[SIZE];
291	–	q.addAll(Arrays.asList(ints));
292	–	shouldThrow();
293	–	} catch (NullPointerException success) {}
294	–	}
295	–	/**
249		* addAll of a collection with any null elements throws NPE after
250		* possibly adding some elements
251		*/
#	Line 323 | Line 276 | public class DelayQueueTest extends JSR1
276		}
277
278		/**
326	–	* put(null) throws NPE
327	–	*/
328	–	public void testPutNull() {
329	–	try {
330	–	DelayQueue q = new DelayQueue();
331	–	q.put(null);
332	–	shouldThrow();
333	–	} catch (NullPointerException success) {}
334	–	}
335	–
336	–	/**
279		* all elements successfully put are contained
280		*/
281	<	public void testPut() {
282	<	DelayQueue q = new DelayQueue();
283	<	for (int i = 0; i < SIZE; ++i) {
284	<	PDelay I = new PDelay(i);
285	<	q.put(I);
286	<	assertTrue(q.contains(I));
287	<	}
288	<	assertEquals(SIZE, q.size());
281	>	public void testPut() {
282	>	DelayQueue q = new DelayQueue();
283	>	for (int i = 0; i < SIZE; ++i) {
284	>	PDelay I = new PDelay(i);
285	>	q.put(I);
286	>	assertTrue(q.contains(I));
287	>	}
288	>	assertEquals(SIZE, q.size());
289		}
290
291		/**
#	Line 351 | Line 293 | public class DelayQueueTest extends JSR1
293		*/
294		public void testPutWithTake() throws InterruptedException {
295		final DelayQueue q = new DelayQueue();
296	<	Thread t = new Thread(new CheckedRunnable() {
296	>	Thread t = newStartedThread(new CheckedRunnable() {
297		public void realRun() {
298		q.put(new PDelay(0));
299		q.put(new PDelay(0));
#	Line 359 | Line 301 | public class DelayQueueTest extends JSR1
301		q.put(new PDelay(0));
302		}});
303
304	<	t.start();
305	<	Thread.sleep(SHORT_DELAY_MS);
364	<	q.take();
365	<	t.interrupt();
366	<	t.join();
304	>	awaitTermination(t);
305	>	assertEquals(4, q.size());
306		}
307
308		/**
#	Line 371 | Line 310 | public class DelayQueueTest extends JSR1
310		*/
311		public void testTimedOffer() throws InterruptedException {
312		final DelayQueue q = new DelayQueue();
313	<	Thread t = new Thread(new CheckedRunnable() {
313	>	Thread t = newStartedThread(new CheckedRunnable() {
314		public void realRun() throws InterruptedException {
315		q.put(new PDelay(0));
316		q.put(new PDelay(0));
#	Line 379 | Line 318 | public class DelayQueueTest extends JSR1
318		assertTrue(q.offer(new PDelay(0), LONG_DELAY_MS, MILLISECONDS));
319		}});
320
321	<	t.start();
383	<	Thread.sleep(SMALL_DELAY_MS);
384	<	t.interrupt();
385	<	t.join();
321	>	awaitTermination(t);
322		}
323
324		/**
#	Line 396 | Line 332 | public class DelayQueueTest extends JSR1
332		}
333
334		/**
399	–	* take blocks interruptibly when empty
400	–	*/
401	–	public void testTakeFromEmpty() throws InterruptedException {
402	–	final DelayQueue q = new DelayQueue();
403	–	Thread t = new ThreadShouldThrow(InterruptedException.class) {
404	–	public void realRun() throws InterruptedException {
405	–	q.take();
406	–	}};
407	–
408	–	t.start();
409	–	Thread.sleep(SHORT_DELAY_MS);
410	–	t.interrupt();
411	–	t.join();
412	–	}
413	–
414	–	/**
335		* Take removes existing elements until empty, then blocks interruptibly
336		*/
337		public void testBlockingTake() throws InterruptedException {
338		final DelayQueue q = populatedQueue(SIZE);
339	<	Thread t = new Thread(new CheckedRunnable() {
339	>	final CountDownLatch pleaseInterrupt = new CountDownLatch(1);
340	>	Thread t = newStartedThread(new CheckedRunnable() {
341		public void realRun() throws InterruptedException {
342		for (int i = 0; i < SIZE; ++i) {
343		assertEquals(new PDelay(i), ((PDelay)q.take()));
344		}
345	+
346	+	Thread.currentThread().interrupt();
347		try {
348		q.take();
349		shouldThrow();
350		} catch (InterruptedException success) {}
351	+	assertFalse(Thread.interrupted());
352	+
353	+	pleaseInterrupt.countDown();
354	+	try {
355	+	q.take();
356	+	shouldThrow();
357	+	} catch (InterruptedException success) {}
358	+	assertFalse(Thread.interrupted());
359		}});
360
361	<	t.start();
362	<	Thread.sleep(SHORT_DELAY_MS);
361	>	await(pleaseInterrupt);
362	>	assertThreadStaysAlive(t);
363		t.interrupt();
364	<	t.join();
364	>	awaitTermination(t);
365		}
366
436	–
367		/**
368		* poll succeeds unless empty
369		*/
#	Line 446 | Line 376 | public class DelayQueueTest extends JSR1
376		}
377
378		/**
379	<	* timed pool with zero timeout succeeds when non-empty, else times out
379	>	* timed poll with zero timeout succeeds when non-empty, else times out
380		*/
381		public void testTimedPoll0() throws InterruptedException {
382		DelayQueue q = populatedQueue(SIZE);
#	Line 457 | Line 387 | public class DelayQueueTest extends JSR1
387		}
388
389		/**
390	<	* timed pool with nonzero timeout succeeds when non-empty, else times out
390	>	* timed poll with nonzero timeout succeeds when non-empty, else times out
391		*/
392		public void testTimedPoll() throws InterruptedException {
393		DelayQueue q = populatedQueue(SIZE);
394		for (int i = 0; i < SIZE; ++i) {
395	<	assertEquals(new PDelay(i), ((PDelay)q.poll(SHORT_DELAY_MS, MILLISECONDS)));
396	<	}
397	<	assertNull(q.poll(SHORT_DELAY_MS, MILLISECONDS));
395	>	long startTime = System.nanoTime();
396	>	assertEquals(new PDelay(i), ((PDelay)q.poll(LONG_DELAY_MS, MILLISECONDS)));
397	>	assertTrue(millisElapsedSince(startTime) < LONG_DELAY_MS);
398	>	}
399	>	long startTime = System.nanoTime();
400	>	assertNull(q.poll(timeoutMillis(), MILLISECONDS));
401	>	assertTrue(millisElapsedSince(startTime) >= timeoutMillis());
402	>	checkEmpty(q);
403		}
404
405		/**
#	Line 472 | Line 407 | public class DelayQueueTest extends JSR1
407		* returning timeout status
408		*/
409		public void testInterruptedTimedPoll() throws InterruptedException {
410	<	Thread t = new Thread(new CheckedRunnable() {
410	>	final CountDownLatch pleaseInterrupt = new CountDownLatch(1);
411	>	Thread t = newStartedThread(new CheckedRunnable() {
412		public void realRun() throws InterruptedException {
413		DelayQueue q = populatedQueue(SIZE);
414		for (int i = 0; i < SIZE; ++i) {
415		assertEquals(new PDelay(i), ((PDelay)q.poll(SHORT_DELAY_MS, MILLISECONDS)));
416		}
417	+
418	+	Thread.currentThread().interrupt();
419		try {
420	<	q.poll(SMALL_DELAY_MS, MILLISECONDS);
420	>	q.poll(LONG_DELAY_MS, MILLISECONDS);
421		shouldThrow();
422		} catch (InterruptedException success) {}
423	<	}});
423	>	assertFalse(Thread.interrupted());
424
425	<	t.start();
488	<	Thread.sleep(SHORT_DELAY_MS);
489	<	t.interrupt();
490	<	t.join();
491	<	}
492	<
493	<	/**
494	<	*  timed poll before a delayed offer fails; after offer succeeds;
495	<	*  on interruption throws
496	<	*/
497	<	public void testTimedPollWithOffer() throws InterruptedException {
498	<	final DelayQueue q = new DelayQueue();
499	<	final PDelay pdelay = new PDelay(0);
500	<	Thread t = new Thread(new CheckedRunnable() {
501	<	public void realRun() throws InterruptedException {
502	<	assertNull(q.poll(SHORT_DELAY_MS, MILLISECONDS));
503	<	assertSame(pdelay, q.poll(LONG_DELAY_MS, MILLISECONDS));
425	>	pleaseInterrupt.countDown();
426		try {
427		q.poll(LONG_DELAY_MS, MILLISECONDS);
428		shouldThrow();
429		} catch (InterruptedException success) {}
430	+	assertFalse(Thread.interrupted());
431		}});
432
433	<	t.start();
434	<	Thread.sleep(SMALL_DELAY_MS);
512	<	assertTrue(q.offer(pdelay, SHORT_DELAY_MS, MILLISECONDS));
433	>	await(pleaseInterrupt);
434	>	assertThreadStaysAlive(t);
435		t.interrupt();
436	<	t.join();
436	>	awaitTermination(t);
437		}
438
517	–
439		/**
440		* peek returns next element, or null if empty
441		*/
#	Line 561 | Line 482 | public class DelayQueueTest extends JSR1
482		}
483
484		/**
564	–	* remove(x) removes x and returns true if present
565	–	*/
566	–	public void testRemoveElement() {
567	–	DelayQueue q = populatedQueue(SIZE);
568	–	for (int i = 1; i < SIZE; i+=2) {
569	–	assertTrue(q.remove(new PDelay(i)));
570	–	}
571	–	for (int i = 0; i < SIZE; i+=2) {
572	–	assertTrue(q.remove(new PDelay(i)));
573	–	assertFalse(q.remove(new PDelay(i+1)));
574	–	}
575	–	assertTrue(q.isEmpty());
576	–	}
577	–
578	–	/**
485		* contains(x) reports true when elements added but not yet removed
486		*/
487		public void testContains() {
#	Line 661 | Line 567 | public class DelayQueueTest extends JSR1
567		Object[] o = q.toArray();
568		Arrays.sort(o);
569		for (int i = 0; i < o.length; i++)
570	<	assertEquals(o[i], q.take());
570	>	assertSame(o[i], q.take());
571		}
572
573		/**
574		* toArray(a) contains all elements
575		*/
576	<	public void testToArray2() throws InterruptedException {
577	<	DelayQueue q = populatedQueue(SIZE);
576	>	public void testToArray2() {
577	>	DelayQueue<PDelay> q = populatedQueue(SIZE);
578		PDelay[] ints = new PDelay[SIZE];
579	<	ints = (PDelay[])q.toArray(ints);
579	>	PDelay[] array = q.toArray(ints);
580	>	assertSame(ints, array);
581		Arrays.sort(ints);
582		for (int i = 0; i < ints.length; i++)
583	<	assertEquals(ints[i], q.take());
583	>	assertSame(ints[i], q.remove());
584		}
585
679	–
586		/**
587	<	* toArray(null) throws NPE
682	<	*/
683	<	public void testToArray_BadArg() {
684	<	DelayQueue q = populatedQueue(SIZE);
685	<	try {
686	<	Object o[] = q.toArray(null);
687	<	shouldThrow();
688	<	} catch (NullPointerException success) {}
689	<	}
690	<
691	<	/**
692	<	* toArray with incompatible array type throws CCE
587	>	* toArray(incompatible array type) throws ArrayStoreException
588		*/
589		public void testToArray1_BadArg() {
590		DelayQueue q = populatedQueue(SIZE);
591		try {
592	<	Object o[] = q.toArray(new String[10]);
592	>	q.toArray(new String[10]);
593		shouldThrow();
594		} catch (ArrayStoreException success) {}
595		}
#	Line 716 | Line 611 | public class DelayQueueTest extends JSR1
611		/**
612		* iterator.remove removes current element
613		*/
614	<	public void testIteratorRemove () {
614	>	public void testIteratorRemove() {
615		final DelayQueue q = new DelayQueue();
616		q.add(new PDelay(2));
617		q.add(new PDelay(1));
#	Line 730 | Line 625 | public class DelayQueueTest extends JSR1
625		assertFalse(it.hasNext());
626		}
627
733	–
628		/**
629		* toString contains toStrings of elements
630		*/
631		public void testToString() {
632		DelayQueue q = populatedQueue(SIZE);
633		String s = q.toString();
634	<	for (int i = 0; i < SIZE; ++i) {
635	<	assertTrue(s.indexOf(String.valueOf(Integer.MIN_VALUE+i)) >= 0);
742	<	}
634	>	for (Object e : q)
635	>	assertTrue(s.contains(e.toString()));
636		}
637
638		/**
639	<	* offer transfers elements across Executor tasks
639	>	* timed poll transfers elements across Executor tasks
640		*/
641		public void testPollInExecutor() {
642		final DelayQueue q = new DelayQueue();
643	+	final CheckedBarrier threadsStarted = new CheckedBarrier(2);
644		ExecutorService executor = Executors.newFixedThreadPool(2);
645		executor.execute(new CheckedRunnable() {
646		public void realRun() throws InterruptedException {
647	<	threadAssertNull(q.poll());
648	<	threadAssertTrue(null != q.poll(MEDIUM_DELAY_MS, MILLISECONDS));
649	<	threadAssertTrue(q.isEmpty());
647	>	assertNull(q.poll());
648	>	threadsStarted.await();
649	>	assertTrue(null != q.poll(LONG_DELAY_MS, MILLISECONDS));
650	>	checkEmpty(q);
651		}});
652
653		executor.execute(new CheckedRunnable() {
654		public void realRun() throws InterruptedException {
655	<	Thread.sleep(SHORT_DELAY_MS);
655	>	threadsStarted.await();
656		q.put(new PDelay(1));
657		}});
658
659		joinPool(executor);
765	–
660		}
661
768	–
662		/**
663		* Delayed actions do not occur until their delay elapses
664		*/
665		public void testDelay() throws InterruptedException {
666	<	DelayQueue q = new DelayQueue();
667	<	NanoDelay[] elements = new NanoDelay[SIZE];
668	<	for (int i = 0; i < SIZE; ++i) {
776	<	elements[i] = new NanoDelay(1000000000L + 1000000L * (SIZE - i));
777	<	}
778	<	for (int i = 0; i < SIZE; ++i) {
779	<	q.add(elements[i]);
780	<	}
666	>	DelayQueue<NanoDelay> q = new DelayQueue<NanoDelay>();
667	>	for (int i = 0; i < SIZE; ++i)
668	>	q.add(new NanoDelay(1000000L * (SIZE - i)));
669
670		long last = 0;
671		for (int i = 0; i < SIZE; ++i) {
672	<	NanoDelay e = (NanoDelay)(q.take());
672	>	NanoDelay e = q.take();
673		long tt = e.getTriggerTime();
674	<	assertTrue(tt <= System.nanoTime());
674	>	assertTrue(System.nanoTime() - tt >= 0);
675		if (i != 0)
676		assertTrue(tt >= last);
677		last = tt;
678		}
679	+	assertTrue(q.isEmpty());
680		}
681
682		/**
#	Line 796 | Line 685 | public class DelayQueueTest extends JSR1
685		public void testPeekDelayed() {
686		DelayQueue q = new DelayQueue();
687		q.add(new NanoDelay(Long.MAX_VALUE));
688	<	assert(q.peek() != null);
688	>	assertNotNull(q.peek());
689		}
690
802	–
691		/**
692		* poll of a non-empty queue returns null if no expired elements.
693		*/
#	Line 815 | Line 703 | public class DelayQueueTest extends JSR1
703		public void testTimedPollDelayed() throws InterruptedException {
704		DelayQueue q = new DelayQueue();
705		q.add(new NanoDelay(LONG_DELAY_MS * 1000000L));
706	<	assertNull(q.poll(SHORT_DELAY_MS, MILLISECONDS));
819	<	}
820	<
821	<	/**
822	<	* drainTo(null) throws NPE
823	<	*/
824	<	public void testDrainToNull() {
825	<	DelayQueue q = populatedQueue(SIZE);
826	<	try {
827	<	q.drainTo(null);
828	<	shouldThrow();
829	<	} catch (NullPointerException success) {}
830	<	}
831	<
832	<	/**
833	<	* drainTo(this) throws IAE
834	<	*/
835	<	public void testDrainToSelf() {
836	<	DelayQueue q = populatedQueue(SIZE);
837	<	try {
838	<	q.drainTo(q);
839	<	shouldThrow();
840	<	} catch (IllegalArgumentException success) {}
706	>	assertNull(q.poll(timeoutMillis(), MILLISECONDS));
707		}
708
709		/**
#	Line 887 | Line 753 | public class DelayQueueTest extends JSR1
753		}
754
755		/**
756	<	* drainTo(null, n) throws NPE
891	<	*/
892	<	public void testDrainToNullN() {
893	<	DelayQueue q = populatedQueue(SIZE);
894	<	try {
895	<	q.drainTo(null, 0);
896	<	shouldThrow();
897	<	} catch (NullPointerException success) {}
898	<	}
899	<
900	<	/**
901	<	* drainTo(this, n) throws IAE
902	<	*/
903	<	public void testDrainToSelfN() {
904	<	DelayQueue q = populatedQueue(SIZE);
905	<	try {
906	<	q.drainTo(q, 0);
907	<	shouldThrow();
908	<	} catch (IllegalArgumentException success) {}
909	<	}
910	<
911	<	/**
912	<	* drainTo(c, n) empties first max {n, size} elements of queue into c
756	>	* drainTo(c, n) empties first min(n, size) elements of queue into c
757		*/
758		public void testDrainToN() {
759		for (int i = 0; i < SIZE + 2; ++i) {
760		DelayQueue q = populatedQueue(SIZE);
761		ArrayList l = new ArrayList();
762		q.drainTo(l, i);
763	<	int k = (i < SIZE)? i : SIZE;
763	>	int k = (i < SIZE) ? i : SIZE;
764		assertEquals(q.size(), SIZE-k);
765		assertEquals(l.size(), k);
766		}
767		}
768
925	–
769		}

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