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Comparing jsr166/src/test/tck/LinkedBlockingQueueTest.java (file contents):
Revision 1.39 by jsr166, Sun Nov 28 08:43:53 2010 UTC vs.
Revision 1.48 by jsr166, Sat Nov 26 05:19:17 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.*;
11	<	import java.util.concurrent.*;
10	>	import java.util.Arrays;
11	>	import java.util.ArrayList;
12	>	import java.util.Collection;
13	>	import java.util.Iterator;
14	>	import java.util.NoSuchElementException;
15	>	import java.util.Queue;
16	>	import java.util.concurrent.BlockingQueue;
17	>	import java.util.concurrent.CountDownLatch;
18	>	import java.util.concurrent.LinkedBlockingQueue;
19	>	import java.util.concurrent.Executors;
20	>	import java.util.concurrent.ExecutorService;
21		import static java.util.concurrent.TimeUnit.MILLISECONDS;
13	–	import java.io.*;
22
23		public class LinkedBlockingQueueTest extends JSR166TestCase {
24
#	Line 22 | Line 30 | public class LinkedBlockingQueueTest ext
30
31		public static class Bounded extends BlockingQueueTest {
32		protected BlockingQueue emptyCollection() {
33	<	return new LinkedBlockingQueue(20);
33	>	return new LinkedBlockingQueue(SIZE);
34		}
35		}
36
#	Line 36 | Line 44 | public class LinkedBlockingQueueTest ext
44		new Bounded().testSuite());
45		}
46
39	–
47		/**
48		* Create a queue of given size containing consecutive
49		* Integers 0 ... n.
#	Line 63 | Line 70 | public class LinkedBlockingQueueTest ext
70		}
71
72		/**
73	<	* Constructor throws IAE if capacity argument nonpositive
73	>	* Constructor throws IllegalArgumentException if capacity argument nonpositive
74		*/
75		public void testConstructor2() {
76		try {
77	<	LinkedBlockingQueue q = new LinkedBlockingQueue(0);
77	>	new LinkedBlockingQueue(0);
78		shouldThrow();
79		} catch (IllegalArgumentException success) {}
80		}
81
82		/**
83	<	* Initializing from null Collection throws NPE
83	>	* Initializing from null Collection throws NullPointerException
84		*/
85		public void testConstructor3() {
86		try {
87	<	LinkedBlockingQueue q = new LinkedBlockingQueue(null);
87	>	new LinkedBlockingQueue(null);
88		shouldThrow();
89		} catch (NullPointerException success) {}
90		}
91
92		/**
93	<	* Initializing from Collection of null elements throws NPE
93	>	* Initializing from Collection of null elements throws NullPointerException
94		*/
95		public void testConstructor4() {
96	+	Collection<Integer> elements = Arrays.asList(new Integer[SIZE]);
97		try {
98	<	Integer[] ints = new Integer[SIZE];
91	<	LinkedBlockingQueue q = new LinkedBlockingQueue(Arrays.asList(ints));
98	>	new LinkedBlockingQueue(elements);
99		shouldThrow();
100		} catch (NullPointerException success) {}
101		}
102
103		/**
104	<	* Initializing from Collection with some null elements throws NPE
104	>	* Initializing from Collection with some null elements throws
105	>	* NullPointerException
106		*/
107		public void testConstructor5() {
108	+	Integer[] ints = new Integer[SIZE];
109	+	for (int i = 0; i < SIZE-1; ++i)
110	+	ints[i] = new Integer(i);
111	+	Collection<Integer> elements = Arrays.asList(ints);
112		try {
113	<	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));
113	>	new LinkedBlockingQueue(elements);
114		shouldThrow();
115		} catch (NullPointerException success) {}
116		}
#	Line 151 | Line 160 | public class LinkedBlockingQueueTest ext
160		}
161
162		/**
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	–	/**
163		* Offer succeeds if not full; fails if full
164		*/
165		public void testOffer() {
#	Line 182 | Line 169 | public class LinkedBlockingQueueTest ext
169		}
170
171		/**
172	<	* add succeeds if not full; throws ISE if full
172	>	* add succeeds if not full; throws IllegalStateException if full
173		*/
174		public void testAdd() {
175	+	LinkedBlockingQueue q = new LinkedBlockingQueue(SIZE);
176	+	for (int i = 0; i < SIZE; ++i)
177	+	assertTrue(q.add(new Integer(i)));
178	+	assertEquals(0, q.remainingCapacity());
179		try {
189	–	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());
180		q.add(new Integer(SIZE));
181		shouldThrow();
182		} catch (IllegalStateException success) {}
183		}
184
185		/**
186	<	* 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
186	>	* addAll(this) throws IllegalArgumentException
187		*/
188		public void testAddAllSelf() {
189	+	LinkedBlockingQueue q = populatedQueue(SIZE);
190		try {
215	–	LinkedBlockingQueue q = populatedQueue(SIZE);
191		q.addAll(q);
192		shouldThrow();
193		} catch (IllegalArgumentException success) {}
194		}
195
196		/**
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	–	/**
197		* addAll of a collection with any null elements throws NPE after
198		* possibly adding some elements
199		*/
200		public void testAddAll3() {
201	+	LinkedBlockingQueue q = new LinkedBlockingQueue(SIZE);
202	+	Integer[] ints = new Integer[SIZE];
203	+	for (int i = 0; i < SIZE-1; ++i)
204	+	ints[i] = new Integer(i);
205	+	Collection<Integer> elements = Arrays.asList(ints);
206		try {
207	<	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));
207	>	q.addAll(elements);
208		shouldThrow();
209		} catch (NullPointerException success) {}
210		}
211
212		/**
213	<	* addAll throws ISE if not enough room
213	>	* addAll throws IllegalStateException if not enough room
214		*/
215		public void testAddAll4() {
216	+	LinkedBlockingQueue q = new LinkedBlockingQueue(SIZE - 1);
217	+	Integer[] ints = new Integer[SIZE];
218	+	for (int i = 0; i < SIZE; ++i)
219	+	ints[i] = new Integer(i);
220	+	Collection<Integer> elements = Arrays.asList(ints);
221		try {
222	<	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));
222	>	q.addAll(elements);
223		shouldThrow();
224		} catch (IllegalStateException success) {}
225		}
#	Line 275 | Line 240 | public class LinkedBlockingQueueTest ext
240		}
241
242		/**
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	–	/**
243		* all elements successfully put are contained
244		*/
245		public void testPut() throws InterruptedException {
#	Line 303 | Line 257 | public class LinkedBlockingQueueTest ext
257		*/
258		public void testBlockingPut() throws InterruptedException {
259		final LinkedBlockingQueue q = new LinkedBlockingQueue(SIZE);
260	<	Thread t = new Thread(new CheckedRunnable() {
260	>	final CountDownLatch pleaseInterrupt = new CountDownLatch(1);
261	>	Thread t = newStartedThread(new CheckedRunnable() {
262		public void realRun() throws InterruptedException {
263		for (int i = 0; i < SIZE; ++i)
264		q.put(i);
265		assertEquals(SIZE, q.size());
266		assertEquals(0, q.remainingCapacity());
267	+
268	+	Thread.currentThread().interrupt();
269		try {
270		q.put(99);
271		shouldThrow();
272		} catch (InterruptedException success) {}
273	+	assertFalse(Thread.interrupted());
274	+
275	+	pleaseInterrupt.countDown();
276	+	try {
277	+	q.put(99);
278	+	shouldThrow();
279	+	} catch (InterruptedException success) {}
280	+	assertFalse(Thread.interrupted());
281		}});
282
283	<	t.start();
284	<	Thread.sleep(SHORT_DELAY_MS);
283	>	await(pleaseInterrupt);
284	>	assertThreadStaysAlive(t);
285		t.interrupt();
286	<	t.join();
286	>	awaitTermination(t);
287		assertEquals(SIZE, q.size());
288		assertEquals(0, q.remainingCapacity());
289		}
290
291		/**
292	<	* put blocks waiting for take when full
292	>	* put blocks interruptibly waiting for take when full
293		*/
294		public void testPutWithTake() throws InterruptedException {
295		final int capacity = 2;
296		final LinkedBlockingQueue q = new LinkedBlockingQueue(2);
297	<	Thread t = new Thread(new CheckedRunnable() {
297	>	final CountDownLatch pleaseTake = new CountDownLatch(1);
298	>	final CountDownLatch pleaseInterrupt = new CountDownLatch(1);
299	>	Thread t = newStartedThread(new CheckedRunnable() {
300		public void realRun() throws InterruptedException {
301	<	for (int i = 0; i < capacity + 1; i++)
301	>	for (int i = 0; i < capacity; i++)
302		q.put(i);
303	+	pleaseTake.countDown();
304	+	q.put(86);
305	+
306	+	pleaseInterrupt.countDown();
307		try {
308		q.put(99);
309		shouldThrow();
310		} catch (InterruptedException success) {}
311	+	assertFalse(Thread.interrupted());
312		}});
313
314	<	t.start();
315	<	Thread.sleep(SHORT_DELAY_MS);
344	<	assertEquals(q.remainingCapacity(), 0);
314	>	await(pleaseTake);
315	>	assertEquals(0, q.remainingCapacity());
316		assertEquals(0, q.take());
317	<	Thread.sleep(SHORT_DELAY_MS);
317	>
318	>	await(pleaseInterrupt);
319	>	assertThreadStaysAlive(t);
320		t.interrupt();
321	<	t.join();
322	<	assertEquals(q.remainingCapacity(), 0);
321	>	awaitTermination(t);
322	>	assertEquals(0, q.remainingCapacity());
323		}
324
325		/**
326		* timed offer times out if full and elements not taken
327		*/
328	<	public void testTimedOffer() throws InterruptedException {
328	>	public void testTimedOffer() {
329		final LinkedBlockingQueue q = new LinkedBlockingQueue(2);
330	<	Thread t = new Thread(new CheckedRunnable() {
330	>	final CountDownLatch pleaseInterrupt = new CountDownLatch(1);
331	>	Thread t = newStartedThread(new CheckedRunnable() {
332		public void realRun() throws InterruptedException {
333		q.put(new Object());
334		q.put(new Object());
335	<	assertFalse(q.offer(new Object(), SHORT_DELAY_MS, MILLISECONDS));
335	>	long startTime = System.nanoTime();
336	>	assertFalse(q.offer(new Object(), timeoutMillis(), MILLISECONDS));
337	>	assertTrue(millisElapsedSince(startTime) >= timeoutMillis());
338	>	pleaseInterrupt.countDown();
339		try {
340	<	q.offer(new Object(), LONG_DELAY_MS, MILLISECONDS);
340	>	q.offer(new Object(), 2 * LONG_DELAY_MS, MILLISECONDS);
341		shouldThrow();
342		} catch (InterruptedException success) {}
343		}});
344
345	<	t.start();
346	<	Thread.sleep(SMALL_DELAY_MS);
345	>	await(pleaseInterrupt);
346	>	assertThreadStaysAlive(t);
347		t.interrupt();
348	<	t.join();
348	>	awaitTermination(t);
349		}
350
351		/**
#	Line 385 | Line 362 | public class LinkedBlockingQueueTest ext
362		* Take removes existing elements until empty, then blocks interruptibly
363		*/
364		public void testBlockingTake() throws InterruptedException {
365	<	final LinkedBlockingQueue q = populatedQueue(SIZE);
366	<	Thread t = new Thread(new CheckedRunnable() {
365	>	final BlockingQueue q = populatedQueue(SIZE);
366	>	final CountDownLatch pleaseInterrupt = new CountDownLatch(1);
367	>	Thread t = newStartedThread(new CheckedRunnable() {
368		public void realRun() throws InterruptedException {
369		for (int i = 0; i < SIZE; ++i) {
370		assertEquals(i, q.take());
371		}
372	+
373	+	Thread.currentThread().interrupt();
374	+	try {
375	+	q.take();
376	+	shouldThrow();
377	+	} catch (InterruptedException success) {}
378	+	assertFalse(Thread.interrupted());
379	+
380	+	pleaseInterrupt.countDown();
381		try {
382		q.take();
383		shouldThrow();
384		} catch (InterruptedException success) {}
385	+	assertFalse(Thread.interrupted());
386		}});
387
388	<	t.start();
389	<	Thread.sleep(SHORT_DELAY_MS);
388	>	await(pleaseInterrupt);
389	>	assertThreadStaysAlive(t);
390		t.interrupt();
391	<	t.join();
391	>	awaitTermination(t);
392		}
393
394		/**
#	Line 429 | Line 417 | public class LinkedBlockingQueueTest ext
417		* timed poll with nonzero timeout succeeds when non-empty, else times out
418		*/
419		public void testTimedPoll() throws InterruptedException {
420	<	LinkedBlockingQueue q = populatedQueue(SIZE);
420	>	LinkedBlockingQueue<Integer> q = populatedQueue(SIZE);
421		for (int i = 0; i < SIZE; ++i) {
422	<	assertEquals(i, q.poll(SHORT_DELAY_MS, MILLISECONDS));
423	<	}
424	<	assertNull(q.poll(SHORT_DELAY_MS, MILLISECONDS));
422	>	long startTime = System.nanoTime();
423	>	assertEquals(i, (int) q.poll(LONG_DELAY_MS, MILLISECONDS));
424	>	assertTrue(millisElapsedSince(startTime) < LONG_DELAY_MS);
425	>	}
426	>	long startTime = System.nanoTime();
427	>	assertNull(q.poll(timeoutMillis(), MILLISECONDS));
428	>	assertTrue(millisElapsedSince(startTime) >= timeoutMillis());
429	>	checkEmpty(q);
430		}
431
432		/**
#	Line 511 | Line 504 | public class LinkedBlockingQueueTest ext
504		}
505
506		/**
514	–	* remove(x) removes x and returns true if present
515	–	*/
516	–	public void testRemoveElement() {
517	–	LinkedBlockingQueue q = populatedQueue(SIZE);
518	–	for (int i = 1; i < SIZE; i+=2) {
519	–	assertTrue(q.contains(i));
520	–	assertTrue(q.remove(i));
521	–	assertFalse(q.contains(i));
522	–	assertTrue(q.contains(i-1));
523	–	}
524	–	for (int i = 0; i < SIZE; i+=2) {
525	–	assertTrue(q.contains(i));
526	–	assertTrue(q.remove(i));
527	–	assertFalse(q.contains(i));
528	–	assertFalse(q.remove(i+1));
529	–	assertFalse(q.contains(i+1));
530	–	}
531	–	assertTrue(q.isEmpty());
532	–	}
533	–
534	–	/**
507		* An add following remove(x) succeeds
508		*/
509		public void testRemoveElementAndAdd() throws InterruptedException {
#	Line 644 | Line 616 | public class LinkedBlockingQueueTest ext
616		}
617
618		/**
647	–	* toArray(null) throws NullPointerException
648	–	*/
649	–	public void testToArray_NullArg() {
650	–	LinkedBlockingQueue q = populatedQueue(SIZE);
651	–	try {
652	–	q.toArray(null);
653	–	shouldThrow();
654	–	} catch (NullPointerException success) {}
655	–	}
656	–
657	–	/**
619		* toArray(incompatible array type) throws ArrayStoreException
620		*/
621		public void testToArray1_BadArg() {
#	Line 665 | Line 626 | public class LinkedBlockingQueueTest ext
626		} catch (ArrayStoreException success) {}
627		}
628
668	–
629		/**
630		* iterator iterates through all elements
631		*/
#	Line 696 | Line 656 | public class LinkedBlockingQueueTest ext
656		assertFalse(it.hasNext());
657		}
658
699	–
659		/**
660		* iterator ordering is FIFO
661		*/
#	Line 728 | Line 687 | public class LinkedBlockingQueueTest ext
687		assertEquals(0, q.size());
688		}
689
731	–
690		/**
691		* toString contains toStrings of elements
692		*/
#	Line 736 | Line 694 | public class LinkedBlockingQueueTest ext
694		LinkedBlockingQueue q = populatedQueue(SIZE);
695		String s = q.toString();
696		for (int i = 0; i < SIZE; ++i) {
697	<	assertTrue(s.indexOf(String.valueOf(i)) >= 0);
697	>	assertTrue(s.contains(String.valueOf(i)));
698		}
699		}
700
743	–
701		/**
702		* offer transfers elements across Executor tasks
703		*/
#	Line 749 | Line 706 | public class LinkedBlockingQueueTest ext
706		q.add(one);
707		q.add(two);
708		ExecutorService executor = Executors.newFixedThreadPool(2);
709	+	final CheckedBarrier threadsStarted = new CheckedBarrier(2);
710		executor.execute(new CheckedRunnable() {
711		public void realRun() throws InterruptedException {
712		assertFalse(q.offer(three));
713	<	assertTrue(q.offer(three, MEDIUM_DELAY_MS, MILLISECONDS));
713	>	threadsStarted.await();
714	>	assertTrue(q.offer(three, LONG_DELAY_MS, MILLISECONDS));
715		assertEquals(0, q.remainingCapacity());
716		}});
717
718		executor.execute(new CheckedRunnable() {
719		public void realRun() throws InterruptedException {
720	<	Thread.sleep(SMALL_DELAY_MS);
720	>	threadsStarted.await();
721		assertSame(one, q.take());
722		}});
723
#	Line 766 | Line 725 | public class LinkedBlockingQueueTest ext
725		}
726
727		/**
728	<	* poll retrieves elements across Executor threads
728	>	* timed poll retrieves elements across Executor threads
729		*/
730		public void testPollInExecutor() {
731		final LinkedBlockingQueue q = new LinkedBlockingQueue(2);
732	+	final CheckedBarrier threadsStarted = new CheckedBarrier(2);
733		ExecutorService executor = Executors.newFixedThreadPool(2);
734		executor.execute(new CheckedRunnable() {
735		public void realRun() throws InterruptedException {
736		assertNull(q.poll());
737	<	assertSame(one, q.poll(MEDIUM_DELAY_MS, MILLISECONDS));
738	<	assertTrue(q.isEmpty());
737	>	threadsStarted.await();
738	>	assertSame(one, q.poll(LONG_DELAY_MS, MILLISECONDS));
739	>	checkEmpty(q);
740		}});
741
742		executor.execute(new CheckedRunnable() {
743		public void realRun() throws InterruptedException {
744	<	Thread.sleep(SMALL_DELAY_MS);
744	>	threadsStarted.await();
745		q.put(one);
746		}});
747
#	Line 791 | Line 752 | public class LinkedBlockingQueueTest ext
752		* A deserialized serialized queue has same elements in same order
753		*/
754		public void testSerialization() throws Exception {
755	<	LinkedBlockingQueue q = populatedQueue(SIZE);
756	<
796	<	ByteArrayOutputStream bout = new ByteArrayOutputStream(10000);
797	<	ObjectOutputStream out = new ObjectOutputStream(new BufferedOutputStream(bout));
798	<	out.writeObject(q);
799	<	out.close();
755	>	Queue x = populatedQueue(SIZE);
756	>	Queue y = serialClone(x);
757
758	<	ByteArrayInputStream bin = new ByteArrayInputStream(bout.toByteArray());
759	<	ObjectInputStream in = new ObjectInputStream(new BufferedInputStream(bin));
760	<	LinkedBlockingQueue r = (LinkedBlockingQueue)in.readObject();
761	<	assertEquals(q.size(), r.size());
762	<	while (!q.isEmpty())
763	<	assertEquals(q.remove(), r.remove());
764	<	}
765	<
766	<	/**
810	<	* drainTo(null) throws NPE
811	<	*/
812	<	public void testDrainToNull() {
813	<	LinkedBlockingQueue q = populatedQueue(SIZE);
814	<	try {
815	<	q.drainTo(null);
816	<	shouldThrow();
817	<	} catch (NullPointerException success) {}
818	<	}
819	<
820	<	/**
821	<	* drainTo(this) throws IAE
822	<	*/
823	<	public void testDrainToSelf() {
824	<	LinkedBlockingQueue q = populatedQueue(SIZE);
825	<	try {
826	<	q.drainTo(q);
827	<	shouldThrow();
828	<	} catch (IllegalArgumentException success) {}
758	>	assertTrue(x != y);
759	>	assertEquals(x.size(), y.size());
760	>	assertEquals(x.toString(), y.toString());
761	>	assertTrue(Arrays.equals(x.toArray(), y.toArray()));
762	>	while (!x.isEmpty()) {
763	>	assertFalse(y.isEmpty());
764	>	assertEquals(x.remove(), y.remove());
765	>	}
766	>	assertTrue(y.isEmpty());
767		}
768
769		/**
#	Line 835 | Line 773 | public class LinkedBlockingQueueTest ext
773		LinkedBlockingQueue q = populatedQueue(SIZE);
774		ArrayList l = new ArrayList();
775		q.drainTo(l);
776	<	assertEquals(q.size(), 0);
777	<	assertEquals(l.size(), SIZE);
776	>	assertEquals(0, q.size());
777	>	assertEquals(SIZE, l.size());
778		for (int i = 0; i < SIZE; ++i)
779		assertEquals(l.get(i), new Integer(i));
780		q.add(zero);
#	Line 846 | Line 784 | public class LinkedBlockingQueueTest ext
784		assertTrue(q.contains(one));
785		l.clear();
786		q.drainTo(l);
787	<	assertEquals(q.size(), 0);
788	<	assertEquals(l.size(), 2);
787	>	assertEquals(0, q.size());
788	>	assertEquals(2, l.size());
789		for (int i = 0; i < 2; ++i)
790		assertEquals(l.get(i), new Integer(i));
791		}
#	Line 873 | Line 811 | public class LinkedBlockingQueueTest ext
811		}
812
813		/**
876	–	* drainTo(null, n) throws NPE
877	–	*/
878	–	public void testDrainToNullN() {
879	–	LinkedBlockingQueue q = populatedQueue(SIZE);
880	–	try {
881	–	q.drainTo(null, 0);
882	–	shouldThrow();
883	–	} catch (NullPointerException success) {}
884	–	}
885	–
886	–	/**
887	–	* drainTo(this, n) throws IAE
888	–	*/
889	–	public void testDrainToSelfN() {
890	–	LinkedBlockingQueue q = populatedQueue(SIZE);
891	–	try {
892	–	q.drainTo(q, 0);
893	–	shouldThrow();
894	–	} catch (IllegalArgumentException success) {}
895	–	}
896	–
897	–	/**
814		* drainTo(c, n) empties first min(n, size) elements of queue into c
815		*/
816		public void testDrainToN() {

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