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Comparing jsr166/src/test/tck/DelayQueueTest.java (file contents):
Revision 1.50 by jsr166, Fri May 27 20:07:24 2011 UTC vs.
Revision 1.77 by jsr166, Thu Sep 15 17:07:16 2016 UTC

# Line 6 | Line 6
6   * Pat Fisher, Mike Judd.
7   */
8  
9 import junit.framework.*;
10 import java.util.*;
9   import static java.util.concurrent.TimeUnit.MILLISECONDS;
10 < import java.util.concurrent.*;
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.concurrent.BlockingQueue;
17 > import java.util.concurrent.CountDownLatch;
18 > import java.util.concurrent.Delayed;
19 > import java.util.concurrent.DelayQueue;
20 > import java.util.concurrent.Executors;
21 > import java.util.concurrent.ExecutorService;
22 > import java.util.concurrent.TimeUnit;
23 >
24 > import junit.framework.Test;
25  
26   public class DelayQueueTest extends JSR166TestCase {
27 +
28 +    public static class Generic extends BlockingQueueTest {
29 +        protected BlockingQueue emptyCollection() {
30 +            return new DelayQueue();
31 +        }
32 +        protected PDelay makeElement(int i) {
33 +            return new PDelay(i);
34 +        }
35 +    }
36 +
37      public static void main(String[] args) {
38 <        junit.textui.TestRunner.run(suite());
38 >        main(suite(), args);
39      }
40  
41      public static Test suite() {
42 <        return new TestSuite(DelayQueueTest.class);
42 >        return newTestSuite(DelayQueueTest.class,
43 >                            new Generic().testSuite());
44      }
45  
23    private static final int NOCAP = Integer.MAX_VALUE;
24
46      /**
47       * A delayed implementation for testing.
48       * Most tests use Pseudodelays, where delays are all elapsed
# Line 29 | Line 50 | public class DelayQueueTest extends JSR1
50       */
51      static class PDelay implements Delayed {
52          int pseudodelay;
53 <        PDelay(int i) { pseudodelay = Integer.MIN_VALUE + i; }
54 <        public int compareTo(PDelay y) {
55 <            int i = pseudodelay;
56 <            int j = y.pseudodelay;
57 <            if (i < j) return -1;
37 <            if (i > j) return 1;
38 <            return 0;
53 >        PDelay(int i) { pseudodelay = i; }
54 >        public int compareTo(PDelay other) {
55 >            int a = this.pseudodelay;
56 >            int b = other.pseudodelay;
57 >            return (a < b) ? -1 : (a > b) ? 1 : 0;
58          }
40
59          public int compareTo(Delayed y) {
60              return compareTo((PDelay)y);
61          }
44
62          public boolean equals(Object other) {
63 <            return equals((PDelay)other);
64 <        }
48 <        public boolean equals(PDelay other) {
49 <            return other.pseudodelay == pseudodelay;
63 >            return (other instanceof PDelay) &&
64 >                this.pseudodelay == ((PDelay)other).pseudodelay;
65          }
66 <
66 >        // suppress [overrides] javac warning
67 >        public int hashCode() { return pseudodelay; }
68          public long getDelay(TimeUnit ignore) {
69 <            return pseudodelay;
54 <        }
55 <        public int intValue() {
56 <            return pseudodelay;
69 >            return Integer.MIN_VALUE + pseudodelay;
70          }
58
71          public String toString() {
72              return String.valueOf(pseudodelay);
73          }
# Line 82 | Line 94 | public class DelayQueueTest extends JSR1
94          }
95  
96          public boolean equals(Object other) {
97 <            return equals((NanoDelay)other);
98 <        }
87 <        public boolean equals(NanoDelay other) {
88 <            return other.trigger == trigger;
97 >            return (other instanceof NanoDelay) &&
98 >                this.trigger == ((NanoDelay)other).trigger;
99          }
100  
101 +        // suppress [overrides] javac warning
102 +        public int hashCode() { return (int) trigger; }
103 +
104          public long getDelay(TimeUnit unit) {
105              long n = trigger - System.nanoTime();
106              return unit.convert(n, TimeUnit.NANOSECONDS);
# Line 103 | Line 116 | public class DelayQueueTest extends JSR1
116      }
117  
118      /**
119 <     * Create a queue of given size containing consecutive
119 >     * Returns a new queue of given size containing consecutive
120       * PDelays 0 ... n.
121       */
122      private DelayQueue<PDelay> populatedQueue(int n) {
123          DelayQueue<PDelay> q = new DelayQueue<PDelay>();
124          assertTrue(q.isEmpty());
125 <        for (int i = n-1; i >= 0; i-=2)
125 >        for (int i = n - 1; i >= 0; i -= 2)
126              assertTrue(q.offer(new PDelay(i)));
127 <        for (int i = (n & 1); i < n; i+=2)
127 >        for (int i = (n & 1); i < n; i += 2)
128              assertTrue(q.offer(new PDelay(i)));
129          assertFalse(q.isEmpty());
130 <        assertEquals(NOCAP, q.remainingCapacity());
130 >        assertEquals(Integer.MAX_VALUE, q.remainingCapacity());
131          assertEquals(n, q.size());
132          return q;
133      }
# Line 123 | Line 136 | public class DelayQueueTest extends JSR1
136       * A new queue has unbounded capacity
137       */
138      public void testConstructor1() {
139 <        assertEquals(NOCAP, new DelayQueue().remainingCapacity());
139 >        assertEquals(Integer.MAX_VALUE, new DelayQueue().remainingCapacity());
140      }
141  
142      /**
# Line 131 | Line 144 | public class DelayQueueTest extends JSR1
144       */
145      public void testConstructor3() {
146          try {
147 <            DelayQueue q = new DelayQueue(null);
147 >            new DelayQueue(null);
148              shouldThrow();
149          } catch (NullPointerException success) {}
150      }
# Line 141 | Line 154 | public class DelayQueueTest extends JSR1
154       */
155      public void testConstructor4() {
156          try {
157 <            PDelay[] ints = new PDelay[SIZE];
145 <            DelayQueue q = new DelayQueue(Arrays.asList(ints));
157 >            new DelayQueue(Arrays.asList(new PDelay[SIZE]));
158              shouldThrow();
159          } catch (NullPointerException success) {}
160      }
# Line 151 | Line 163 | public class DelayQueueTest extends JSR1
163       * Initializing from Collection with some null elements throws NPE
164       */
165      public void testConstructor5() {
166 +        PDelay[] a = new PDelay[SIZE];
167 +        for (int i = 0; i < SIZE - 1; ++i)
168 +            a[i] = new PDelay(i);
169          try {
170 <            PDelay[] ints = new PDelay[SIZE];
156 <            for (int i = 0; i < SIZE-1; ++i)
157 <                ints[i] = new PDelay(i);
158 <            DelayQueue q = new DelayQueue(Arrays.asList(ints));
170 >            new DelayQueue(Arrays.asList(a));
171              shouldThrow();
172          } catch (NullPointerException success) {}
173      }
# Line 178 | Line 190 | public class DelayQueueTest extends JSR1
190      public void testEmpty() {
191          DelayQueue q = new DelayQueue();
192          assertTrue(q.isEmpty());
193 <        assertEquals(NOCAP, q.remainingCapacity());
193 >        assertEquals(Integer.MAX_VALUE, q.remainingCapacity());
194          q.add(new PDelay(1));
195          assertFalse(q.isEmpty());
196          q.add(new PDelay(2));
# Line 188 | Line 200 | public class DelayQueueTest extends JSR1
200      }
201  
202      /**
203 <     * remainingCapacity does not change when elements added or removed,
192 <     * but size does
203 >     * remainingCapacity() always returns Integer.MAX_VALUE
204       */
205      public void testRemainingCapacity() {
206 <        DelayQueue q = populatedQueue(SIZE);
206 >        BlockingQueue q = populatedQueue(SIZE);
207          for (int i = 0; i < SIZE; ++i) {
208 <            assertEquals(NOCAP, q.remainingCapacity());
209 <            assertEquals(SIZE-i, q.size());
210 <            q.remove();
208 >            assertEquals(Integer.MAX_VALUE, q.remainingCapacity());
209 >            assertEquals(SIZE - i, q.size());
210 >            assertTrue(q.remove() instanceof PDelay);
211          }
212          for (int i = 0; i < SIZE; ++i) {
213 <            assertEquals(NOCAP, q.remainingCapacity());
213 >            assertEquals(Integer.MAX_VALUE, q.remainingCapacity());
214              assertEquals(i, q.size());
215 <            q.add(new PDelay(i));
215 >            assertTrue(q.add(new PDelay(i)));
216          }
217      }
218  
219      /**
209     * offer(null) throws NPE
210     */
211    public void testOfferNull() {
212        try {
213            DelayQueue q = new DelayQueue();
214            q.offer(null);
215            shouldThrow();
216        } catch (NullPointerException success) {}
217    }
218
219    /**
220     * add(null) throws NPE
221     */
222    public void testAddNull() {
223        try {
224            DelayQueue q = new DelayQueue();
225            q.add(null);
226            shouldThrow();
227        } catch (NullPointerException success) {}
228    }
229
230    /**
220       * offer non-null succeeds
221       */
222      public void testOffer() {
# Line 248 | Line 237 | public class DelayQueueTest extends JSR1
237      }
238  
239      /**
251     * addAll(null) throws NPE
252     */
253    public void testAddAll1() {
254        try {
255            DelayQueue q = new DelayQueue();
256            q.addAll(null);
257            shouldThrow();
258        } catch (NullPointerException success) {}
259    }
260
261    /**
240       * addAll(this) throws IAE
241       */
242      public void testAddAllSelf() {
243 +        DelayQueue q = populatedQueue(SIZE);
244          try {
266            DelayQueue q = populatedQueue(SIZE);
245              q.addAll(q);
246              shouldThrow();
247          } catch (IllegalArgumentException success) {}
248      }
249  
250      /**
273     * addAll of a collection with null elements throws NPE
274     */
275    public void testAddAll2() {
276        try {
277            DelayQueue q = new DelayQueue();
278            PDelay[] ints = new PDelay[SIZE];
279            q.addAll(Arrays.asList(ints));
280            shouldThrow();
281        } catch (NullPointerException success) {}
282    }
283
284    /**
251       * addAll of a collection with any null elements throws NPE after
252       * possibly adding some elements
253       */
254      public void testAddAll3() {
255 +        DelayQueue q = new DelayQueue();
256 +        PDelay[] a = new PDelay[SIZE];
257 +        for (int i = 0; i < SIZE - 1; ++i)
258 +            a[i] = new PDelay(i);
259          try {
260 <            DelayQueue q = new DelayQueue();
291 <            PDelay[] ints = new PDelay[SIZE];
292 <            for (int i = 0; i < SIZE-1; ++i)
293 <                ints[i] = new PDelay(i);
294 <            q.addAll(Arrays.asList(ints));
260 >            q.addAll(Arrays.asList(a));
261              shouldThrow();
262          } catch (NullPointerException success) {}
263      }
# Line 302 | Line 268 | public class DelayQueueTest extends JSR1
268      public void testAddAll5() {
269          PDelay[] empty = new PDelay[0];
270          PDelay[] ints = new PDelay[SIZE];
271 <        for (int i = SIZE-1; i >= 0; --i)
271 >        for (int i = SIZE - 1; i >= 0; --i)
272              ints[i] = new PDelay(i);
273          DelayQueue q = new DelayQueue();
274          assertFalse(q.addAll(Arrays.asList(empty)));
# Line 312 | Line 278 | public class DelayQueueTest extends JSR1
278      }
279  
280      /**
315     * put(null) throws NPE
316     */
317    public void testPutNull() {
318        try {
319            DelayQueue q = new DelayQueue();
320            q.put(null);
321            shouldThrow();
322        } catch (NullPointerException success) {}
323    }
324
325    /**
281       * all elements successfully put are contained
282       */
283      public void testPut() {
284          DelayQueue q = new DelayQueue();
285          for (int i = 0; i < SIZE; ++i) {
286 <            PDelay I = new PDelay(i);
287 <            q.put(I);
288 <            assertTrue(q.contains(I));
286 >            PDelay x = new PDelay(i);
287 >            q.put(x);
288 >            assertTrue(q.contains(x));
289          }
290          assertEquals(SIZE, q.size());
291      }
# Line 374 | Line 329 | public class DelayQueueTest extends JSR1
329      public void testTake() throws InterruptedException {
330          DelayQueue q = populatedQueue(SIZE);
331          for (int i = 0; i < SIZE; ++i) {
332 <            assertEquals(new PDelay(i), ((PDelay)q.take()));
332 >            assertEquals(new PDelay(i), q.take());
333          }
334      }
335  
336      /**
382     * take blocks interruptibly when empty
383     */
384    public void testTakeFromEmptyBlocksInterruptibly()
385            throws InterruptedException {
386        final BlockingQueue q = new DelayQueue();
387        final CountDownLatch threadStarted = new CountDownLatch(1);
388        Thread t = newStartedThread(new CheckedRunnable() {
389            public void realRun() {
390                threadStarted.countDown();
391                try {
392                    q.take();
393                    shouldThrow();
394                } catch (InterruptedException success) {}
395                assertFalse(Thread.interrupted());
396            }});
397
398        await(threadStarted);
399        assertThreadStaysAlive(t);
400        t.interrupt();
401        awaitTermination(t);
402    }
403
404    /**
337       * Take removes existing elements until empty, then blocks interruptibly
338       */
339      public void testBlockingTake() throws InterruptedException {
# Line 440 | Line 372 | public class DelayQueueTest extends JSR1
372      public void testPoll() {
373          DelayQueue q = populatedQueue(SIZE);
374          for (int i = 0; i < SIZE; ++i) {
375 <            assertEquals(new PDelay(i), ((PDelay)q.poll()));
375 >            assertEquals(new PDelay(i), q.poll());
376          }
377          assertNull(q.poll());
378      }
# Line 451 | Line 383 | public class DelayQueueTest extends JSR1
383      public void testTimedPoll0() throws InterruptedException {
384          DelayQueue q = populatedQueue(SIZE);
385          for (int i = 0; i < SIZE; ++i) {
386 <            assertEquals(new PDelay(i), ((PDelay)q.poll(0, MILLISECONDS)));
386 >            assertEquals(new PDelay(i), q.poll(0, MILLISECONDS));
387          }
388          assertNull(q.poll(0, MILLISECONDS));
389      }
# Line 462 | Line 394 | public class DelayQueueTest extends JSR1
394      public void testTimedPoll() throws InterruptedException {
395          DelayQueue q = populatedQueue(SIZE);
396          for (int i = 0; i < SIZE; ++i) {
397 <            assertEquals(new PDelay(i), ((PDelay)q.poll(SHORT_DELAY_MS, MILLISECONDS)));
397 >            long startTime = System.nanoTime();
398 >            assertEquals(new PDelay(i), q.poll(LONG_DELAY_MS, MILLISECONDS));
399 >            assertTrue(millisElapsedSince(startTime) < LONG_DELAY_MS);
400          }
401 <        assertNull(q.poll(SHORT_DELAY_MS, MILLISECONDS));
401 >        long startTime = System.nanoTime();
402 >        assertNull(q.poll(timeoutMillis(), MILLISECONDS));
403 >        assertTrue(millisElapsedSince(startTime) >= timeoutMillis());
404 >        checkEmpty(q);
405      }
406  
407      /**
# Line 473 | Line 410 | public class DelayQueueTest extends JSR1
410       */
411      public void testInterruptedTimedPoll() throws InterruptedException {
412          final CountDownLatch pleaseInterrupt = new CountDownLatch(1);
413 +        final DelayQueue q = populatedQueue(SIZE);
414          Thread t = newStartedThread(new CheckedRunnable() {
415              public void realRun() throws InterruptedException {
416 <                DelayQueue q = populatedQueue(SIZE);
416 >                long startTime = System.nanoTime();
417                  for (int i = 0; i < SIZE; ++i) {
418 <                    assertEquals(new PDelay(i), ((PDelay)q.poll(SHORT_DELAY_MS, MILLISECONDS)));
418 >                    assertEquals(new PDelay(i),
419 >                                 ((PDelay)q.poll(LONG_DELAY_MS, MILLISECONDS)));
420                  }
421  
422                  Thread.currentThread().interrupt();
# Line 493 | Line 432 | public class DelayQueueTest extends JSR1
432                      shouldThrow();
433                  } catch (InterruptedException success) {}
434                  assertFalse(Thread.interrupted());
435 +                assertTrue(millisElapsedSince(startTime) < LONG_DELAY_MS);
436              }});
437  
438          await(pleaseInterrupt);
439          assertThreadStaysAlive(t);
440          t.interrupt();
441          awaitTermination(t);
442 <    }
503 <
504 <    /**
505 <     * timed poll before a delayed offer fails; after offer succeeds;
506 <     * on interruption throws
507 <     */
508 <    public void testTimedPollWithOffer() throws InterruptedException {
509 <        final DelayQueue q = new DelayQueue();
510 <        final PDelay pdelay = new PDelay(0);
511 <        final CheckedBarrier barrier = new CheckedBarrier(2);
512 <        Thread t = newStartedThread(new CheckedRunnable() {
513 <            public void realRun() throws InterruptedException {
514 <                assertNull(q.poll(SHORT_DELAY_MS, MILLISECONDS));
515 <
516 <                barrier.await();
517 <                assertSame(pdelay, q.poll(LONG_DELAY_MS, MILLISECONDS));
518 <
519 <                Thread.currentThread().interrupt();
520 <                try {
521 <                    q.poll(LONG_DELAY_MS, MILLISECONDS);
522 <                    shouldThrow();
523 <                } catch (InterruptedException success) {}
524 <                assertFalse(Thread.interrupted());
525 <
526 <                barrier.await();
527 <                try {
528 <                    q.poll(LONG_DELAY_MS, MILLISECONDS);
529 <                    shouldThrow();
530 <                } catch (InterruptedException success) {}
531 <                assertFalse(Thread.interrupted());
532 <            }});
533 <
534 <        barrier.await();
535 <        long startTime = System.nanoTime();
536 <        assertTrue(q.offer(pdelay, LONG_DELAY_MS, MILLISECONDS));
537 <        assertTrue(millisElapsedSince(startTime) < LONG_DELAY_MS);
538 <
539 <        barrier.await();
540 <        assertThreadStaysAlive(t);
541 <        t.interrupt();
542 <        awaitTermination(t);
442 >        checkEmpty(q);
443      }
444  
445      /**
# Line 548 | Line 448 | public class DelayQueueTest extends JSR1
448      public void testPeek() {
449          DelayQueue q = populatedQueue(SIZE);
450          for (int i = 0; i < SIZE; ++i) {
451 <            assertEquals(new PDelay(i), ((PDelay)q.peek()));
452 <            assertEquals(new PDelay(i), ((PDelay)q.poll()));
451 >            assertEquals(new PDelay(i), q.peek());
452 >            assertEquals(new PDelay(i), q.poll());
453              if (q.isEmpty())
454                  assertNull(q.peek());
455              else
# Line 564 | Line 464 | public class DelayQueueTest extends JSR1
464      public void testElement() {
465          DelayQueue q = populatedQueue(SIZE);
466          for (int i = 0; i < SIZE; ++i) {
467 <            assertEquals(new PDelay(i), ((PDelay)q.element()));
467 >            assertEquals(new PDelay(i), q.element());
468              q.poll();
469          }
470          try {
# Line 579 | Line 479 | public class DelayQueueTest extends JSR1
479      public void testRemove() {
480          DelayQueue q = populatedQueue(SIZE);
481          for (int i = 0; i < SIZE; ++i) {
482 <            assertEquals(new PDelay(i), ((PDelay)q.remove()));
482 >            assertEquals(new PDelay(i), q.remove());
483          }
484          try {
485              q.remove();
# Line 588 | Line 488 | public class DelayQueueTest extends JSR1
488      }
489  
490      /**
591     * remove(x) removes x and returns true if present
592     */
593    public void testRemoveElement() {
594        DelayQueue q = populatedQueue(SIZE);
595        for (int i = 1; i < SIZE; i+=2) {
596            assertTrue(q.remove(new PDelay(i)));
597        }
598        for (int i = 0; i < SIZE; i+=2) {
599            assertTrue(q.remove(new PDelay(i)));
600            assertFalse(q.remove(new PDelay(i+1)));
601        }
602        assertTrue(q.isEmpty());
603    }
604
605    /**
491       * contains(x) reports true when elements added but not yet removed
492       */
493      public void testContains() {
# Line 622 | Line 507 | public class DelayQueueTest extends JSR1
507          q.clear();
508          assertTrue(q.isEmpty());
509          assertEquals(0, q.size());
510 <        assertEquals(NOCAP, q.remainingCapacity());
510 >        assertEquals(Integer.MAX_VALUE, q.remainingCapacity());
511          PDelay x = new PDelay(1);
512          q.add(x);
513          assertFalse(q.isEmpty());
# Line 659 | Line 544 | public class DelayQueueTest extends JSR1
544                  assertTrue(changed);
545  
546              assertTrue(q.containsAll(p));
547 <            assertEquals(SIZE-i, q.size());
547 >            assertEquals(SIZE - i, q.size());
548              p.remove();
549          }
550      }
# Line 672 | Line 557 | public class DelayQueueTest extends JSR1
557              DelayQueue q = populatedQueue(SIZE);
558              DelayQueue p = populatedQueue(i);
559              assertTrue(q.removeAll(p));
560 <            assertEquals(SIZE-i, q.size());
560 >            assertEquals(SIZE - i, q.size());
561              for (int j = 0; j < i; ++j) {
562 <                PDelay I = (PDelay)(p.remove());
563 <                assertFalse(q.contains(I));
562 >                PDelay x = (PDelay)(p.remove());
563 >                assertFalse(q.contains(x));
564              }
565          }
566      }
# Line 705 | Line 590 | public class DelayQueueTest extends JSR1
590      }
591  
592      /**
708     * toArray(null) throws NullPointerException
709     */
710    public void testToArray_NullArg() {
711        DelayQueue q = populatedQueue(SIZE);
712        try {
713            q.toArray(null);
714            shouldThrow();
715        } catch (NullPointerException success) {}
716    }
717
718    /**
593       * toArray(incompatible array type) throws ArrayStoreException
594       */
595      public void testToArray1_BadArg() {
# Line 738 | Line 612 | public class DelayQueueTest extends JSR1
612              ++i;
613          }
614          assertEquals(i, SIZE);
615 +        assertIteratorExhausted(it);
616 +    }
617 +
618 +    /**
619 +     * iterator of empty collection has no elements
620 +     */
621 +    public void testEmptyIterator() {
622 +        assertIteratorExhausted(new DelayQueue().iterator());
623      }
624  
625      /**
# Line 752 | Line 634 | public class DelayQueueTest extends JSR1
634          it.next();
635          it.remove();
636          it = q.iterator();
637 <        assertEquals(it.next(), new PDelay(2));
638 <        assertEquals(it.next(), new PDelay(3));
637 >        assertEquals(new PDelay(2), it.next());
638 >        assertEquals(new PDelay(3), it.next());
639          assertFalse(it.hasNext());
640      }
641  
# Line 763 | Line 645 | public class DelayQueueTest extends JSR1
645      public void testToString() {
646          DelayQueue q = populatedQueue(SIZE);
647          String s = q.toString();
648 <        for (int i = 0; i < SIZE; ++i) {
649 <            assertTrue(s.contains(String.valueOf(Integer.MIN_VALUE+i)));
768 <        }
648 >        for (Object e : q)
649 >            assertTrue(s.contains(e.toString()));
650      }
651  
652      /**
# Line 774 | Line 655 | public class DelayQueueTest extends JSR1
655      public void testPollInExecutor() {
656          final DelayQueue q = new DelayQueue();
657          final CheckedBarrier threadsStarted = new CheckedBarrier(2);
658 <        ExecutorService executor = Executors.newFixedThreadPool(2);
659 <        executor.execute(new CheckedRunnable() {
660 <            public void realRun() throws InterruptedException {
661 <                assertNull(q.poll());
662 <                threadsStarted.await();
663 <                assertTrue(null != q.poll(LONG_DELAY_MS, MILLISECONDS));
664 <                checkEmpty(q);
665 <            }});
666 <
667 <        executor.execute(new CheckedRunnable() {
668 <            public void realRun() throws InterruptedException {
669 <                threadsStarted.await();
670 <                q.put(new PDelay(1));
671 <            }});
672 <
673 <        joinPool(executor);
658 >        final ExecutorService executor = Executors.newFixedThreadPool(2);
659 >        try (PoolCleaner cleaner = cleaner(executor)) {
660 >            executor.execute(new CheckedRunnable() {
661 >                public void realRun() throws InterruptedException {
662 >                    assertNull(q.poll());
663 >                    threadsStarted.await();
664 >                    assertNotNull(q.poll(LONG_DELAY_MS, MILLISECONDS));
665 >                    checkEmpty(q);
666 >                }});
667 >
668 >            executor.execute(new CheckedRunnable() {
669 >                public void realRun() throws InterruptedException {
670 >                    threadsStarted.await();
671 >                    q.put(new PDelay(1));
672 >                }});
673 >        }
674      }
675  
676      /**
# Line 836 | Line 717 | public class DelayQueueTest extends JSR1
717      public void testTimedPollDelayed() throws InterruptedException {
718          DelayQueue q = new DelayQueue();
719          q.add(new NanoDelay(LONG_DELAY_MS * 1000000L));
720 <        assertNull(q.poll(SHORT_DELAY_MS, MILLISECONDS));
840 <    }
841 <
842 <    /**
843 <     * drainTo(null) throws NPE
844 <     */
845 <    public void testDrainToNull() {
846 <        DelayQueue q = populatedQueue(SIZE);
847 <        try {
848 <            q.drainTo(null);
849 <            shouldThrow();
850 <        } catch (NullPointerException success) {}
851 <    }
852 <
853 <    /**
854 <     * drainTo(this) throws IAE
855 <     */
856 <    public void testDrainToSelf() {
857 <        DelayQueue q = populatedQueue(SIZE);
858 <        try {
859 <            q.drainTo(q);
860 <            shouldThrow();
861 <        } catch (IllegalArgumentException success) {}
720 >        assertNull(q.poll(timeoutMillis(), MILLISECONDS));
721      }
722  
723      /**
# Line 873 | Line 732 | public class DelayQueueTest extends JSR1
732          }
733          ArrayList l = new ArrayList();
734          q.drainTo(l);
735 <        assertEquals(q.size(), 0);
735 >        assertEquals(0, q.size());
736          for (int i = 0; i < SIZE; ++i)
737 <            assertEquals(l.get(i), elems[i]);
737 >            assertEquals(elems[i], l.get(i));
738          q.add(elems[0]);
739          q.add(elems[1]);
740          assertFalse(q.isEmpty());
# Line 883 | Line 742 | public class DelayQueueTest extends JSR1
742          assertTrue(q.contains(elems[1]));
743          l.clear();
744          q.drainTo(l);
745 <        assertEquals(q.size(), 0);
746 <        assertEquals(l.size(), 2);
745 >        assertEquals(0, q.size());
746 >        assertEquals(2, l.size());
747          for (int i = 0; i < 2; ++i)
748 <            assertEquals(l.get(i), elems[i]);
748 >            assertEquals(elems[i], l.get(i));
749      }
750  
751      /**
# Line 896 | Line 755 | public class DelayQueueTest extends JSR1
755          final DelayQueue q = populatedQueue(SIZE);
756          Thread t = new Thread(new CheckedRunnable() {
757              public void realRun() {
758 <                q.put(new PDelay(SIZE+1));
758 >                q.put(new PDelay(SIZE + 1));
759              }});
760  
761          t.start();
# Line 908 | Line 767 | public class DelayQueueTest extends JSR1
767      }
768  
769      /**
911     * drainTo(null, n) throws NPE
912     */
913    public void testDrainToNullN() {
914        DelayQueue q = populatedQueue(SIZE);
915        try {
916            q.drainTo(null, 0);
917            shouldThrow();
918        } catch (NullPointerException success) {}
919    }
920
921    /**
922     * drainTo(this, n) throws IAE
923     */
924    public void testDrainToSelfN() {
925        DelayQueue q = populatedQueue(SIZE);
926        try {
927            q.drainTo(q, 0);
928            shouldThrow();
929        } catch (IllegalArgumentException success) {}
930    }
931
932    /**
770       * drainTo(c, n) empties first min(n, size) elements of queue into c
771       */
772      public void testDrainToN() {
# Line 938 | Line 775 | public class DelayQueueTest extends JSR1
775              ArrayList l = new ArrayList();
776              q.drainTo(l, i);
777              int k = (i < SIZE) ? i : SIZE;
778 <            assertEquals(q.size(), SIZE-k);
779 <            assertEquals(l.size(), k);
778 >            assertEquals(SIZE - k, q.size());
779 >            assertEquals(k, l.size());
780          }
781      }
782  
783 +    /**
784 +     * remove(null), contains(null) always return false
785 +     */
786 +    public void testNeverContainsNull() {
787 +        Collection<?> q = populatedQueue(SIZE);
788 +        assertFalse(q.contains(null));
789 +        assertFalse(q.remove(null));
790 +    }
791   }

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