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root/jsr166/jsr166/src/test/tck/JSR166TestCase.java

Comparing jsr166/src/test/tck/JSR166TestCase.java (file contents):
Revision 1.5 by dl, Fri Sep 26 15:33:13 2003 UTC vs.
Revision 1.88 by jsr166, Tue May 31 15:01:24 2011 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.*;
10	>	import java.io.ByteArrayInputStream;
11	>	import java.io.ByteArrayOutputStream;
12	>	import java.io.ObjectInputStream;
13	>	import java.io.ObjectOutputStream;
14	>	import java.util.Arrays;
15	>	import java.util.Date;
16	>	import java.util.NoSuchElementException;
17	>	import java.util.PropertyPermission;
18		import java.util.concurrent.*;
19	<	import java.io.*;
20	<
19	>	import java.util.concurrent.atomic.AtomicBoolean;
20	>	import java.util.concurrent.atomic.AtomicReference;
21	>	import static java.util.concurrent.TimeUnit.MILLISECONDS;
22	>	import static java.util.concurrent.TimeUnit.NANOSECONDS;
23	>	import java.security.CodeSource;
24	>	import java.security.Permission;
25	>	import java.security.PermissionCollection;
26	>	import java.security.Permissions;
27	>	import java.security.Policy;
28	>	import java.security.ProtectionDomain;
29	>	import java.security.SecurityPermission;
30
31		/**
32		* Base class for JSR166 Junit TCK tests.  Defines some constants,
33		* utility methods and classes, as well as a simple framework for
34		* helping to make sure that assertions failing in generated threads
35		* cause the associated test that generated them to itself fail (which
36	<	* JUnit doe not otherwise arrange).  The rules for creating such
36	>	* JUnit does not otherwise arrange).  The rules for creating such
37		* tests are:
38		*
39		* <ol>
40		*
41		* <li> All assertions in code running in generated threads must use
42	<	* the forms {@link threadFail} , {@link threadAssertTrue} {@link
43	<	* threadAssertEquals}, or {@link threadAssertNull}, (not
44	<	* <tt>fail</tt>, <tt>assertTrue</tt>, etc.) It is OK (but not
42	>	* the forms {@link #threadFail}, {@link #threadAssertTrue}, {@link
43	>	* #threadAssertEquals}, or {@link #threadAssertNull}, (not
44	>	* {@code fail}, {@code assertTrue}, etc.) It is OK (but not
45		* particularly recommended) for other code to use these forms too.
46		* Only the most typically used JUnit assertion methods are defined
47		* this way, but enough to live with.</li>
48		*
49	<	* <li> If you override {@link setUp} or {@link tearDown}, make sure
50	<	* to invoke <tt>super.setUp</tt> and <tt>super.tearDown</tt> within
49	>	* <li> If you override {@link #setUp} or {@link #tearDown}, make sure
50	>	* to invoke {@code super.setUp} and {@code super.tearDown} within
51		* them. These methods are used to clear and check for thread
52		* assertion failures.</li>
53		*
54	<	* <li>All delays and timeouts must use one of the constants {@link
55	<	* SHORT_DELAY_MS}, {@link SMALL_DELAY_MS}, {@link MEDIUM_DELAY_MS},
56	<	* {@link LONG_DELAY_MS}. The idea here is that a SHORT is always
54	>	* <li>All delays and timeouts must use one of the constants {@code
55	>	* SHORT_DELAY_MS}, {@code SMALL_DELAY_MS}, {@code MEDIUM_DELAY_MS},
56	>	* {@code LONG_DELAY_MS}. The idea here is that a SHORT is always
57		* discriminable from zero time, and always allows enough time for the
58		* small amounts of computation (creating a thread, calling a few
59		* methods, etc) needed to reach a timeout point. Similarly, a SMALL
60		* is always discriminable as larger than SHORT and smaller than
61		* MEDIUM.  And so on. These constants are set to conservative values,
62		* but even so, if there is ever any doubt, they can all be increased
63	<	* in one spot to rerun tests on slower platforms</li>
63	>	* in one spot to rerun tests on slower platforms.</li>
64		*
65		* <li> All threads generated must be joined inside each test case
66	<	* method (or <tt>fail</tt> to do so) before returning from the
67	<	* method. The {@link joinPool} method can be used to do this when
66	>	* method (or {@code fail} to do so) before returning from the
67	>	* method. The {@code joinPool} method can be used to do this when
68		* using Executors.</li>
69		*
70		* </ol>
71	+	*
72	+	* <p> <b>Other notes</b>
73	+	* <ul>
74	+	*
75	+	* <li> Usually, there is one testcase method per JSR166 method
76	+	* covering "normal" operation, and then as many exception-testing
77	+	* methods as there are exceptions the method can throw. Sometimes
78	+	* there are multiple tests per JSR166 method when the different
79	+	* "normal" behaviors differ significantly. And sometimes testcases
80	+	* cover multiple methods when they cannot be tested in
81	+	* isolation.</li>
82	+	*
83	+	* <li> The documentation style for testcases is to provide as javadoc
84	+	* a simple sentence or two describing the property that the testcase
85	+	* method purports to test. The javadocs do not say anything about how
86	+	* the property is tested. To find out, read the code.</li>
87	+	*
88	+	* <li> These tests are "conformance tests", and do not attempt to
89	+	* test throughput, latency, scalability or other performance factors
90	+	* (see the separate "jtreg" tests for a set intended to check these
91	+	* for the most central aspects of functionality.) So, most tests use
92	+	* the smallest sensible numbers of threads, collection sizes, etc
93	+	* needed to check basic conformance.</li>
94	+	*
95	+	* <li>The test classes currently do not declare inclusion in
96	+	* any particular package to simplify things for people integrating
97	+	* them in TCK test suites.</li>
98	+	*
99	+	* <li> As a convenience, the {@code main} of this class (JSR166TestCase)
100	+	* runs all JSR166 unit tests.</li>
101	+	*
102	+	* </ul>
103		*/
104		public class JSR166TestCase extends TestCase {
105	+	private static final boolean useSecurityManager =
106	+	Boolean.getBoolean("jsr166.useSecurityManager");
107	+
108	+	protected static final boolean expensiveTests =
109	+	Boolean.getBoolean("jsr166.expensiveTests");
110	+
111	+	/**
112	+	* If true, report on stdout all "slow" tests, that is, ones that
113	+	* take more than profileThreshold milliseconds to execute.
114	+	*/
115	+	private static final boolean profileTests =
116	+	Boolean.getBoolean("jsr166.profileTests");
117	+
118	+	/**
119	+	* The number of milliseconds that tests are permitted for
120	+	* execution without being reported, when profileTests is set.
121	+	*/
122	+	private static final long profileThreshold =
123	+	Long.getLong("jsr166.profileThreshold", 100);
124	+
125	+	protected void runTest() throws Throwable {
126	+	if (profileTests)
127	+	runTestProfiled();
128	+	else
129	+	super.runTest();
130	+	}
131	+
132	+	protected void runTestProfiled() throws Throwable {
133	+	long t0 = System.nanoTime();
134	+	try {
135	+	super.runTest();
136	+	} finally {
137	+	long elapsedMillis =
138	+	(System.nanoTime() - t0) / (1000L * 1000L);
139	+	if (elapsedMillis >= profileThreshold)
140	+	System.out.printf("%n%s: %d%n", toString(), elapsedMillis);
141	+	}
142	+	}
143	+
144	+	/**
145	+	* Runs all JSR166 unit tests using junit.textui.TestRunner
146	+	*/
147	+	public static void main(String[] args) {
148	+	if (useSecurityManager) {
149	+	System.err.println("Setting a permissive security manager");
150	+	Policy.setPolicy(permissivePolicy());
151	+	System.setSecurityManager(new SecurityManager());
152	+	}
153	+	int iters = (args.length == 0) ? 1 : Integer.parseInt(args[0]);
154	+
155	+	Test s = suite();
156	+	for (int i = 0; i < iters; ++i) {
157	+	junit.textui.TestRunner.run(s);
158	+	System.gc();
159	+	System.runFinalization();
160	+	}
161	+	System.exit(0);
162	+	}
163	+
164	+	public static TestSuite newTestSuite(Object... suiteOrClasses) {
165	+	TestSuite suite = new TestSuite();
166	+	for (Object suiteOrClass : suiteOrClasses) {
167	+	if (suiteOrClass instanceof TestSuite)
168	+	suite.addTest((TestSuite) suiteOrClass);
169	+	else if (suiteOrClass instanceof Class)
170	+	suite.addTest(new TestSuite((Class<?>) suiteOrClass));
171	+	else
172	+	throw new ClassCastException("not a test suite or class");
173	+	}
174	+	return suite;
175	+	}
176	+
177	+	/**
178	+	* Collects all JSR166 unit tests as one suite.
179	+	*/
180	+	public static Test suite() {
181	+	return newTestSuite(
182	+	ForkJoinPoolTest.suite(),
183	+	ForkJoinTaskTest.suite(),
184	+	RecursiveActionTest.suite(),
185	+	RecursiveTaskTest.suite(),
186	+	LinkedTransferQueueTest.suite(),
187	+	PhaserTest.suite(),
188	+	ThreadLocalRandomTest.suite(),
189	+	AbstractExecutorServiceTest.suite(),
190	+	AbstractQueueTest.suite(),
191	+	AbstractQueuedSynchronizerTest.suite(),
192	+	AbstractQueuedLongSynchronizerTest.suite(),
193	+	ArrayBlockingQueueTest.suite(),
194	+	ArrayDequeTest.suite(),
195	+	AtomicBooleanTest.suite(),
196	+	AtomicIntegerArrayTest.suite(),
197	+	AtomicIntegerFieldUpdaterTest.suite(),
198	+	AtomicIntegerTest.suite(),
199	+	AtomicLongArrayTest.suite(),
200	+	AtomicLongFieldUpdaterTest.suite(),
201	+	AtomicLongTest.suite(),
202	+	AtomicMarkableReferenceTest.suite(),
203	+	AtomicReferenceArrayTest.suite(),
204	+	AtomicReferenceFieldUpdaterTest.suite(),
205	+	AtomicReferenceTest.suite(),
206	+	AtomicStampedReferenceTest.suite(),
207	+	ConcurrentHashMapTest.suite(),
208	+	ConcurrentLinkedDequeTest.suite(),
209	+	ConcurrentLinkedQueueTest.suite(),
210	+	ConcurrentSkipListMapTest.suite(),
211	+	ConcurrentSkipListSubMapTest.suite(),
212	+	ConcurrentSkipListSetTest.suite(),
213	+	ConcurrentSkipListSubSetTest.suite(),
214	+	CopyOnWriteArrayListTest.suite(),
215	+	CopyOnWriteArraySetTest.suite(),
216	+	CountDownLatchTest.suite(),
217	+	CyclicBarrierTest.suite(),
218	+	DelayQueueTest.suite(),
219	+	EntryTest.suite(),
220	+	ExchangerTest.suite(),
221	+	ExecutorsTest.suite(),
222	+	ExecutorCompletionServiceTest.suite(),
223	+	FutureTaskTest.suite(),
224	+	LinkedBlockingDequeTest.suite(),
225	+	LinkedBlockingQueueTest.suite(),
226	+	LinkedListTest.suite(),
227	+	LockSupportTest.suite(),
228	+	PriorityBlockingQueueTest.suite(),
229	+	PriorityQueueTest.suite(),
230	+	ReentrantLockTest.suite(),
231	+	ReentrantReadWriteLockTest.suite(),
232	+	ScheduledExecutorTest.suite(),
233	+	ScheduledExecutorSubclassTest.suite(),
234	+	SemaphoreTest.suite(),
235	+	SynchronousQueueTest.suite(),
236	+	SystemTest.suite(),
237	+	ThreadLocalTest.suite(),
238	+	ThreadPoolExecutorTest.suite(),
239	+	ThreadPoolExecutorSubclassTest.suite(),
240	+	ThreadTest.suite(),
241	+	TimeUnitTest.suite(),
242	+	TreeMapTest.suite(),
243	+	TreeSetTest.suite(),
244	+	TreeSubMapTest.suite(),
245	+	TreeSubSetTest.suite());
246	+	}
247	+
248
249		public static long SHORT_DELAY_MS;
250		public static long SMALL_DELAY_MS;
#	Line 61 | Line 253 | public class JSR166TestCase extends Test
253
254
255		/**
256	<	* Return the shortest timed delay. This could
257	<	* be reimplmented to use for example a Property.
258	<	*/
256	>	* Returns the shortest timed delay. This could
257	>	* be reimplemented to use for example a Property.
258	>	*/
259		protected long getShortDelay() {
260	<	return 100;
260	>	return 50;
261		}
262
71	–
263		/**
264	<	* Set delays as multiples of SHORT_DELAY.
264	>	* Sets delays as multiples of SHORT_DELAY.
265		*/
266	<	protected  void setDelays() {
266	>	protected void setDelays() {
267		SHORT_DELAY_MS = getShortDelay();
268	<	SMALL_DELAY_MS = SHORT_DELAY_MS * 5;
268	>	SMALL_DELAY_MS  = SHORT_DELAY_MS * 5;
269		MEDIUM_DELAY_MS = SHORT_DELAY_MS * 10;
270	<	LONG_DELAY_MS = SHORT_DELAY_MS * 50;
270	>	LONG_DELAY_MS   = SHORT_DELAY_MS * 200;
271	>	}
272	>
273	>	/**
274	>	* Returns a timeout in milliseconds to be used in tests that
275	>	* verify that operations block or time out.
276	>	*/
277	>	long timeoutMillis() {
278	>	return SHORT_DELAY_MS / 4;
279		}
280
281		/**
282	<	* Flag set true if any threadAssert methods fail
282	>	* Returns a new Date instance representing a time delayMillis
283	>	* milliseconds in the future.
284		*/
285	<	volatile boolean threadFailed;
285	>	Date delayedDate(long delayMillis) {
286	>	return new Date(System.currentTimeMillis() + delayMillis);
287	>	}
288
289		/**
290	<	* Initialize test to indicate that no thread assertions have failed
290	>	* The first exception encountered if any threadAssertXXX method fails.
291		*/
292	<	public void setUp() {
292	>	private final AtomicReference<Throwable> threadFailure
293	>	= new AtomicReference<Throwable>(null);
294	>
295	>	/**
296	>	* Records an exception so that it can be rethrown later in the test
297	>	* harness thread, triggering a test case failure.  Only the first
298	>	* failure is recorded; subsequent calls to this method from within
299	>	* the same test have no effect.
300	>	*/
301	>	public void threadRecordFailure(Throwable t) {
302	>	threadFailure.compareAndSet(null, t);
303	>	}
304	>
305	>	public void setUp() {
306		setDelays();
92	–	threadFailed = false;
307		}
308
309		/**
310	<	* Trigger test case failure if any thread assertions have failed
310	>	* Extra checks that get done for all test cases.
311	>	*
312	>	* Triggers test case failure if any thread assertions have failed,
313	>	* by rethrowing, in the test harness thread, any exception recorded
314	>	* earlier by threadRecordFailure.
315	>	*
316	>	* Triggers test case failure if interrupt status is set in the main thread.
317		*/
318	<	public void tearDown() {
319	<	assertFalse(threadFailed);
318	>	public void tearDown() throws Exception {
319	>	Throwable t = threadFailure.getAndSet(null);
320	>	if (t != null) {
321	>	if (t instanceof Error)
322	>	throw (Error) t;
323	>	else if (t instanceof RuntimeException)
324	>	throw (RuntimeException) t;
325	>	else if (t instanceof Exception)
326	>	throw (Exception) t;
327	>	else {
328	>	AssertionFailedError afe =
329	>	new AssertionFailedError(t.toString());
330	>	afe.initCause(t);
331	>	throw afe;
332	>	}
333	>	}
334	>
335	>	if (Thread.interrupted())
336	>	throw new AssertionFailedError("interrupt status set in main thread");
337		}
338
339		/**
340	<	* Fail, also setting status to indicate current testcase should fail
341	<	*/
340	>	* Just like fail(reason), but additionally recording (using
341	>	* threadRecordFailure) any AssertionFailedError thrown, so that
342	>	* the current testcase will fail.
343	>	*/
344		public void threadFail(String reason) {
345	<	threadFailed = true;
346	<	fail(reason);
345	>	try {
346	>	fail(reason);
347	>	} catch (AssertionFailedError t) {
348	>	threadRecordFailure(t);
349	>	fail(reason);
350	>	}
351		}
352
353		/**
354	<	* If expression not true, set status to indicate current testcase
355	<	* should fail
356	<	*/
354	>	* Just like assertTrue(b), but additionally recording (using
355	>	* threadRecordFailure) any AssertionFailedError thrown, so that
356	>	* the current testcase will fail.
357	>	*/
358		public void threadAssertTrue(boolean b) {
359	<	if (!b) {
116	<	threadFailed = true;
359	>	try {
360		assertTrue(b);
361	+	} catch (AssertionFailedError t) {
362	+	threadRecordFailure(t);
363	+	throw t;
364		}
365		}
366
367		/**
368	<	* If expression not false, set status to indicate current testcase
369	<	* should fail
370	<	*/
368	>	* Just like assertFalse(b), but additionally recording (using
369	>	* threadRecordFailure) any AssertionFailedError thrown, so that
370	>	* the current testcase will fail.
371	>	*/
372		public void threadAssertFalse(boolean b) {
373	<	if (b) {
127	<	threadFailed = true;
373	>	try {
374		assertFalse(b);
375	+	} catch (AssertionFailedError t) {
376	+	threadRecordFailure(t);
377	+	throw t;
378		}
379		}
380
381		/**
382	<	* If argument not null, set status to indicate current testcase
383	<	* should fail
384	<	*/
382	>	* Just like assertNull(x), but additionally recording (using
383	>	* threadRecordFailure) any AssertionFailedError thrown, so that
384	>	* the current testcase will fail.
385	>	*/
386		public void threadAssertNull(Object x) {
387	<	if (x != null) {
138	<	threadFailed = true;
387	>	try {
388		assertNull(x);
389	+	} catch (AssertionFailedError t) {
390	+	threadRecordFailure(t);
391	+	throw t;
392		}
393		}
394
395		/**
396	<	* If arguments not equal, set status to indicate current testcase
397	<	* should fail
398	<	*/
396	>	* Just like assertEquals(x, y), but additionally recording (using
397	>	* threadRecordFailure) any AssertionFailedError thrown, so that
398	>	* the current testcase will fail.
399	>	*/
400		public void threadAssertEquals(long x, long y) {
401	<	if (x != y) {
149	<	threadFailed = true;
401	>	try {
402		assertEquals(x, y);
403	+	} catch (AssertionFailedError t) {
404	+	threadRecordFailure(t);
405	+	throw t;
406		}
407		}
408
409		/**
410	<	* If arguments not equal, set status to indicate current testcase
411	<	* should fail
412	<	*/
410	>	* Just like assertEquals(x, y), but additionally recording (using
411	>	* threadRecordFailure) any AssertionFailedError thrown, so that
412	>	* the current testcase will fail.
413	>	*/
414		public void threadAssertEquals(Object x, Object y) {
415	<	if (x != y && (x == null || !x.equals(y))) {
160	<	threadFailed = true;
415	>	try {
416		assertEquals(x, y);
417	+	} catch (AssertionFailedError t) {
418	+	threadRecordFailure(t);
419	+	throw t;
420	+	} catch (Throwable t) {
421	+	threadUnexpectedException(t);
422	+	}
423	+	}
424	+
425	+	/**
426	+	* Just like assertSame(x, y), but additionally recording (using
427	+	* threadRecordFailure) any AssertionFailedError thrown, so that
428	+	* the current testcase will fail.
429	+	*/
430	+	public void threadAssertSame(Object x, Object y) {
431	+	try {
432	+	assertSame(x, y);
433	+	} catch (AssertionFailedError t) {
434	+	threadRecordFailure(t);
435	+	throw t;
436		}
437		}
438
439		/**
440	<	* threadFail with message "should throw exception"
441	<	*/
440	>	* Calls threadFail with message "should throw exception".
441	>	*/
442		public void threadShouldThrow() {
443	<	threadFailed = true;
444	<	fail("should throw exception");
443	>	threadFail("should throw exception");
444	>	}
445	>
446	>	/**
447	>	* Calls threadFail with message "should throw" + exceptionName.
448	>	*/
449	>	public void threadShouldThrow(String exceptionName) {
450	>	threadFail("should throw " + exceptionName);
451		}
452
453		/**
454	<	* threadFail with message "Unexpected exception"
454	>	* Records the given exception using {@link #threadRecordFailure},
455	>	* then rethrows the exception, wrapping it in an
456	>	* AssertionFailedError if necessary.
457		*/
458	<	public void threadUnexpectedException() {
459	<	threadFailed = true;
460	<	fail("Unexpected exception");
458	>	public void threadUnexpectedException(Throwable t) {
459	>	threadRecordFailure(t);
460	>	t.printStackTrace();
461	>	if (t instanceof RuntimeException)
462	>	throw (RuntimeException) t;
463	>	else if (t instanceof Error)
464	>	throw (Error) t;
465	>	else {
466	>	AssertionFailedError afe =
467	>	new AssertionFailedError("unexpected exception: " + t);
468	>	afe.initCause(t);
469	>	throw afe;
470	>	}
471		}
472
473	+	/**
474	+	* Delays, via Thread.sleep, for the given millisecond delay, but
475	+	* if the sleep is shorter than specified, may re-sleep or yield
476	+	* until time elapses.
477	+	*/
478	+	static void delay(long millis) throws InterruptedException {
479	+	long startTime = System.nanoTime();
480	+	long ns = millis * 1000 * 1000;
481	+	for (;;) {
482	+	if (millis > 0L)
483	+	Thread.sleep(millis);
484	+	else // too short to sleep
485	+	Thread.yield();
486	+	long d = ns - (System.nanoTime() - startTime);
487	+	if (d > 0L)
488	+	millis = d / (1000 * 1000);
489	+	else
490	+	break;
491	+	}
492	+	}
493
494		/**
495	<	* Wait out termination of a thread pool or fail doing so
495	>	* Waits out termination of a thread pool or fails doing so.
496		*/
497	<	public void joinPool(ExecutorService exec) {
497	>	void joinPool(ExecutorService exec) {
498		try {
499		exec.shutdown();
500	<	assertTrue(exec.awaitTermination(LONG_DELAY_MS, TimeUnit.MILLISECONDS));
501	<	} catch(InterruptedException ie) {
502	<	fail("Unexpected exception");
500	>	assertTrue("ExecutorService did not terminate in a timely manner",
501	>	exec.awaitTermination(2 * LONG_DELAY_MS, MILLISECONDS));
502	>	} catch (SecurityException ok) {
503	>	// Allowed in case test doesn't have privs
504	>	} catch (InterruptedException ie) {
505	>	fail("Unexpected InterruptedException");
506		}
507		}
508
509	+	/**
510	+	* Checks that thread does not terminate within the default
511	+	* millisecond delay of {@code timeoutMillis()}.
512	+	*/
513	+	void assertThreadStaysAlive(Thread thread) {
514	+	assertThreadStaysAlive(thread, timeoutMillis());
515	+	}
516	+
517	+	/**
518	+	* Checks that thread does not terminate within the given millisecond delay.
519	+	*/
520	+	void assertThreadStaysAlive(Thread thread, long millis) {
521	+	try {
522	+	// No need to optimize the failing case via Thread.join.
523	+	delay(millis);
524	+	assertTrue(thread.isAlive());
525	+	} catch (InterruptedException ie) {
526	+	fail("Unexpected InterruptedException");
527	+	}
528	+	}
529	+
530	+	/**
531	+	* Checks that future.get times out, with the default timeout of
532	+	* {@code timeoutMillis()}.
533	+	*/
534	+	void assertFutureTimesOut(Future future) {
535	+	assertFutureTimesOut(future, timeoutMillis());
536	+	}
537
538		/**
539	<	* fail with message "should throw exception"
540	<	*/
539	>	* Checks that future.get times out, with the given millisecond timeout.
540	>	*/
541	>	void assertFutureTimesOut(Future future, long timeoutMillis) {
542	>	long startTime = System.nanoTime();
543	>	try {
544	>	future.get(timeoutMillis, MILLISECONDS);
545	>	shouldThrow();
546	>	} catch (TimeoutException success) {
547	>	} catch (Exception e) {
548	>	threadUnexpectedException(e);
549	>	} finally { future.cancel(true); }
550	>	assertTrue(millisElapsedSince(startTime) >= timeoutMillis);
551	>	}
552	>
553	>	/**
554	>	* Fails with message "should throw exception".
555	>	*/
556		public void shouldThrow() {
557		fail("Should throw exception");
558		}
559
560		/**
561	<	* fail with message "Unexpected exception"
561	>	* Fails with message "should throw " + exceptionName.
562		*/
563	<	public void unexpectedException() {
564	<	fail("Unexpected exception");
563	>	public void shouldThrow(String exceptionName) {
564	>	fail("Should throw " + exceptionName);
565		}
566
209	–
567		/**
568		* The number of elements to place in collections, arrays, etc.
569		*/
570	<	static final int SIZE = 20;
570	>	public static final int SIZE = 20;
571
572		// Some convenient Integer constants
573
574	<	static final Integer zero = new Integer(0);
575	<	static final Integer one = new Integer(1);
576	<	static final Integer two = new Integer(2);
577	<	static final Integer three  = new Integer(3);
578	<	static final Integer four  = new Integer(4);
579	<	static final Integer five  = new Integer(5);
580	<	static final Integer six = new Integer(6);
581	<	static final Integer seven = new Integer(7);
582	<	static final Integer eight = new Integer(8);
583	<	static final Integer nine = new Integer(9);
584	<	static final Integer m1  = new Integer(-1);
585	<	static final Integer m2  = new Integer(-2);
586	<	static final Integer m3  = new Integer(-3);
587	<	static final Integer m4 = new Integer(-4);
588	<	static final Integer m5 = new Integer(-5);
589	<	static final Integer m10 = new Integer(-10);
574	>	public static final Integer zero  = new Integer(0);
575	>	public static final Integer one   = new Integer(1);
576	>	public static final Integer two   = new Integer(2);
577	>	public static final Integer three = new Integer(3);
578	>	public static final Integer four  = new Integer(4);
579	>	public static final Integer five  = new Integer(5);
580	>	public static final Integer six   = new Integer(6);
581	>	public static final Integer seven = new Integer(7);
582	>	public static final Integer eight = new Integer(8);
583	>	public static final Integer nine  = new Integer(9);
584	>	public static final Integer m1  = new Integer(-1);
585	>	public static final Integer m2  = new Integer(-2);
586	>	public static final Integer m3  = new Integer(-3);
587	>	public static final Integer m4  = new Integer(-4);
588	>	public static final Integer m5  = new Integer(-5);
589	>	public static final Integer m6  = new Integer(-6);
590	>	public static final Integer m10 = new Integer(-10);
591
592
593	<	// Some convenient Runnable classes
593	>	/**
594	>	* Runs Runnable r with a security policy that permits precisely
595	>	* the specified permissions.  If there is no current security
596	>	* manager, the runnable is run twice, both with and without a
597	>	* security manager.  We require that any security manager permit
598	>	* getPolicy/setPolicy.
599	>	*/
600	>	public void runWithPermissions(Runnable r, Permission... permissions) {
601	>	SecurityManager sm = System.getSecurityManager();
602	>	if (sm == null) {
603	>	r.run();
604	>	Policy savedPolicy = Policy.getPolicy();
605	>	try {
606	>	Policy.setPolicy(permissivePolicy());
607	>	System.setSecurityManager(new SecurityManager());
608	>	runWithPermissions(r, permissions);
609	>	} finally {
610	>	System.setSecurityManager(null);
611	>	Policy.setPolicy(savedPolicy);
612	>	}
613	>	} else {
614	>	Policy savedPolicy = Policy.getPolicy();
615	>	AdjustablePolicy policy = new AdjustablePolicy(permissions);
616	>	Policy.setPolicy(policy);
617
618	<	static class NoOpRunnable implements Runnable {
619	<	public void run() {}
618	>	try {
619	>	r.run();
620	>	} finally {
621	>	policy.addPermission(new SecurityPermission("setPolicy"));
622	>	Policy.setPolicy(savedPolicy);
623	>	}
624	>	}
625		}
626
627	<	static class NoOpCallable implements Callable {
628	<	public Object call() { return Boolean.TRUE; }
627	>	/**
628	>	* Runs a runnable without any permissions.
629	>	*/
630	>	public void runWithoutPermissions(Runnable r) {
631	>	runWithPermissions(r);
632		}
633
634	<	class ShortRunnable implements Runnable {
635	<	public void run() {
636	<	try {
637	<	Thread.sleep(SHORT_DELAY_MS);
634	>	/**
635	>	* A security policy where new permissions can be dynamically added
636	>	* or all cleared.
637	>	*/
638	>	public static class AdjustablePolicy extends java.security.Policy {
639	>	Permissions perms = new Permissions();
640	>	AdjustablePolicy(Permission... permissions) {
641	>	for (Permission permission : permissions)
642	>	perms.add(permission);
643	>	}
644	>	void addPermission(Permission perm) { perms.add(perm); }
645	>	void clearPermissions() { perms = new Permissions(); }
646	>	public PermissionCollection getPermissions(CodeSource cs) {
647	>	return perms;
648	>	}
649	>	public PermissionCollection getPermissions(ProtectionDomain pd) {
650	>	return perms;
651	>	}
652	>	public boolean implies(ProtectionDomain pd, Permission p) {
653	>	return perms.implies(p);
654	>	}
655	>	public void refresh() {}
656	>	}
657	>
658	>	/**
659	>	* Returns a policy containing all the permissions we ever need.
660	>	*/
661	>	public static Policy permissivePolicy() {
662	>	return new AdjustablePolicy
663	>	// Permissions j.u.c. needs directly
664	>	(new RuntimePermission("modifyThread"),
665	>	new RuntimePermission("getClassLoader"),
666	>	new RuntimePermission("setContextClassLoader"),
667	>	// Permissions needed to change permissions!
668	>	new SecurityPermission("getPolicy"),
669	>	new SecurityPermission("setPolicy"),
670	>	new RuntimePermission("setSecurityManager"),
671	>	// Permissions needed by the junit test harness
672	>	new RuntimePermission("accessDeclaredMembers"),
673	>	new PropertyPermission("*", "read"),
674	>	new java.io.FilePermission("<<ALL FILES>>", "read"));
675	>	}
676	>
677	>	/**
678	>	* Sleeps until the given time has elapsed.
679	>	* Throws AssertionFailedError if interrupted.
680	>	*/
681	>	void sleep(long millis) {
682	>	try {
683	>	delay(millis);
684	>	} catch (InterruptedException ie) {
685	>	AssertionFailedError afe =
686	>	new AssertionFailedError("Unexpected InterruptedException");
687	>	afe.initCause(ie);
688	>	throw afe;
689	>	}
690	>	}
691	>
692	>	/**
693	>	* Spin-waits up to the specified number of milliseconds for the given
694	>	* thread to enter a wait state: BLOCKED, WAITING, or TIMED_WAITING.
695	>	*/
696	>	void waitForThreadToEnterWaitState(Thread thread, long timeoutMillis) {
697	>	long startTime = System.nanoTime();
698	>	for (;;) {
699	>	Thread.State s = thread.getState();
700	>	if (s == Thread.State.BLOCKED ||
701	>	s == Thread.State.WAITING ||
702	>	s == Thread.State.TIMED_WAITING)
703	>	return;
704	>	else if (s == Thread.State.TERMINATED)
705	>	fail("Unexpected thread termination");
706	>	else if (millisElapsedSince(startTime) > timeoutMillis) {
707	>	threadAssertTrue(thread.isAlive());
708	>	return;
709		}
710	<	catch(Exception e) {
711	<	threadUnexpectedException();
710	>	Thread.yield();
711	>	}
712	>	}
713	>
714	>	/**
715	>	* Waits up to LONG_DELAY_MS for the given thread to enter a wait
716	>	* state: BLOCKED, WAITING, or TIMED_WAITING.
717	>	*/
718	>	void waitForThreadToEnterWaitState(Thread thread) {
719	>	waitForThreadToEnterWaitState(thread, LONG_DELAY_MS);
720	>	}
721	>
722	>	/**
723	>	* Returns the number of milliseconds since time given by
724	>	* startNanoTime, which must have been previously returned from a
725	>	* call to {@link System.nanoTime()}.
726	>	*/
727	>	long millisElapsedSince(long startNanoTime) {
728	>	return NANOSECONDS.toMillis(System.nanoTime() - startNanoTime);
729	>	}
730	>
731	>	/**
732	>	* Returns a new started daemon Thread running the given runnable.
733	>	*/
734	>	Thread newStartedThread(Runnable runnable) {
735	>	Thread t = new Thread(runnable);
736	>	t.setDaemon(true);
737	>	t.start();
738	>	return t;
739	>	}
740	>
741	>	/**
742	>	* Waits for the specified time (in milliseconds) for the thread
743	>	* to terminate (using {@link Thread#join(long)}), else interrupts
744	>	* the thread (in the hope that it may terminate later) and fails.
745	>	*/
746	>	void awaitTermination(Thread t, long timeoutMillis) {
747	>	try {
748	>	t.join(timeoutMillis);
749	>	} catch (InterruptedException ie) {
750	>	threadUnexpectedException(ie);
751	>	} finally {
752	>	if (t.getState() != Thread.State.TERMINATED) {
753	>	t.interrupt();
754	>	fail("Test timed out");
755		}
756		}
757		}
758
759	<	class ShortInterruptedRunnable implements Runnable {
760	<	public void run() {
759	>	/**
760	>	* Waits for LONG_DELAY_MS milliseconds for the thread to
761	>	* terminate (using {@link Thread#join(long)}), else interrupts
762	>	* the thread (in the hope that it may terminate later) and fails.
763	>	*/
764	>	void awaitTermination(Thread t) {
765	>	awaitTermination(t, LONG_DELAY_MS);
766	>	}
767	>
768	>	// Some convenient Runnable classes
769	>
770	>	public abstract class CheckedRunnable implements Runnable {
771	>	protected abstract void realRun() throws Throwable;
772	>
773	>	public final void run() {
774		try {
775	<	Thread.sleep(SHORT_DELAY_MS);
776	<	threadShouldThrow();
777	<	}
262	<	catch(InterruptedException success) {
775	>	realRun();
776	>	} catch (Throwable t) {
777	>	threadUnexpectedException(t);
778		}
779		}
780		}
781
782	<	class SmallRunnable implements Runnable {
783	<	public void run() {
782	>	public abstract class RunnableShouldThrow implements Runnable {
783	>	protected abstract void realRun() throws Throwable;
784	>
785	>	final Class<?> exceptionClass;
786	>
787	>	<T extends Throwable> RunnableShouldThrow(Class<T> exceptionClass) {
788	>	this.exceptionClass = exceptionClass;
789	>	}
790	>
791	>	public final void run() {
792		try {
793	<	Thread.sleep(SMALL_DELAY_MS);
794	<	}
795	<	catch(Exception e) {
796	<	threadUnexpectedException();
793	>	realRun();
794	>	threadShouldThrow(exceptionClass.getSimpleName());
795	>	} catch (Throwable t) {
796	>	if (! exceptionClass.isInstance(t))
797	>	threadUnexpectedException(t);
798		}
799		}
800		}
801
802	<	class SmallCallable implements Callable {
803	<	public Object call() {
802	>	public abstract class ThreadShouldThrow extends Thread {
803	>	protected abstract void realRun() throws Throwable;
804	>
805	>	final Class<?> exceptionClass;
806	>
807	>	<T extends Throwable> ThreadShouldThrow(Class<T> exceptionClass) {
808	>	this.exceptionClass = exceptionClass;
809	>	}
810	>
811	>	public final void run() {
812		try {
813	<	Thread.sleep(SMALL_DELAY_MS);
813	>	realRun();
814	>	threadShouldThrow(exceptionClass.getSimpleName());
815	>	} catch (Throwable t) {
816	>	if (! exceptionClass.isInstance(t))
817	>	threadUnexpectedException(t);
818		}
283	–	catch(Exception e) {
284	–	threadUnexpectedException();
285	–	}
286	–	return Boolean.TRUE;
819		}
820		}
821
822	<	class SmallInterruptedRunnable implements Runnable {
823	<	public void run() {
822	>	public abstract class CheckedInterruptedRunnable implements Runnable {
823	>	protected abstract void realRun() throws Throwable;
824	>
825	>	public final void run() {
826		try {
827	<	Thread.sleep(SMALL_DELAY_MS);
828	<	threadShouldThrow();
829	<	}
830	<	catch(InterruptedException success) {
827	>	realRun();
828	>	threadShouldThrow("InterruptedException");
829	>	} catch (InterruptedException success) {
830	>	threadAssertFalse(Thread.interrupted());
831	>	} catch (Throwable t) {
832	>	threadUnexpectedException(t);
833		}
834		}
835		}
836
837	+	public abstract class CheckedCallable<T> implements Callable<T> {
838	+	protected abstract T realCall() throws Throwable;
839
840	<	class MediumRunnable implements Runnable {
303	<	public void run() {
840	>	public final T call() {
841		try {
842	<	Thread.sleep(MEDIUM_DELAY_MS);
843	<	}
844	<	catch(Exception e) {
845	<	threadUnexpectedException();
842	>	return realCall();
843	>	} catch (Throwable t) {
844	>	threadUnexpectedException(t);
845	>	return null;
846		}
847		}
848		}
849
850	<	class MediumInterruptedRunnable implements Runnable {
851	<	public void run() {
850	>	public abstract class CheckedInterruptedCallable<T>
851	>	implements Callable<T> {
852	>	protected abstract T realCall() throws Throwable;
853	>
854	>	public final T call() {
855		try {
856	<	Thread.sleep(MEDIUM_DELAY_MS);
857	<	threadShouldThrow();
858	<	}
859	<	catch(InterruptedException success) {
856	>	T result = realCall();
857	>	threadShouldThrow("InterruptedException");
858	>	return result;
859	>	} catch (InterruptedException success) {
860	>	threadAssertFalse(Thread.interrupted());
861	>	} catch (Throwable t) {
862	>	threadUnexpectedException(t);
863		}
864	+	return null;
865		}
866		}
867
868	<	class MediumPossiblyInterruptedRunnable implements Runnable {
869	<	public void run() {
868	>	public static class NoOpRunnable implements Runnable {
869	>	public void run() {}
870	>	}
871	>
872	>	public static class NoOpCallable implements Callable {
873	>	public Object call() { return Boolean.TRUE; }
874	>	}
875	>
876	>	public static final String TEST_STRING = "a test string";
877	>
878	>	public static class StringTask implements Callable<String> {
879	>	public String call() { return TEST_STRING; }
880	>	}
881	>
882	>	public Callable<String> latchAwaitingStringTask(final CountDownLatch latch) {
883	>	return new CheckedCallable<String>() {
884	>	protected String realCall() {
885	>	try {
886	>	latch.await();
887	>	} catch (InterruptedException quittingTime) {}
888	>	return TEST_STRING;
889	>	}};
890	>	}
891	>
892	>	public Runnable awaiter(final CountDownLatch latch) {
893	>	return new CheckedRunnable() {
894	>	public void realRun() throws InterruptedException {
895	>	await(latch);
896	>	}};
897	>	}
898	>
899	>	public void await(CountDownLatch latch) {
900	>	try {
901	>	assertTrue(latch.await(LONG_DELAY_MS, MILLISECONDS));
902	>	} catch (Throwable t) {
903	>	threadUnexpectedException(t);
904	>	}
905	>	}
906	>
907	>	//     /**
908	>	//      * Spin-waits up to LONG_DELAY_MS until flag becomes true.
909	>	//      */
910	>	//     public void await(AtomicBoolean flag) {
911	>	//         await(flag, LONG_DELAY_MS);
912	>	//     }
913	>
914	>	//     /**
915	>	//      * Spin-waits up to the specified timeout until flag becomes true.
916	>	//      */
917	>	//     public void await(AtomicBoolean flag, long timeoutMillis) {
918	>	//         long startTime = System.nanoTime();
919	>	//         while (!flag.get()) {
920	>	//             if (millisElapsedSince(startTime) > timeoutMillis)
921	>	//                 throw new AssertionFailedError("timed out");
922	>	//             Thread.yield();
923	>	//         }
924	>	//     }
925	>
926	>	public static class NPETask implements Callable<String> {
927	>	public String call() { throw new NullPointerException(); }
928	>	}
929	>
930	>	public static class CallableOne implements Callable<Integer> {
931	>	public Integer call() { return one; }
932	>	}
933	>
934	>	public class ShortRunnable extends CheckedRunnable {
935	>	protected void realRun() throws Throwable {
936	>	delay(SHORT_DELAY_MS);
937	>	}
938	>	}
939	>
940	>	public class ShortInterruptedRunnable extends CheckedInterruptedRunnable {
941	>	protected void realRun() throws InterruptedException {
942	>	delay(SHORT_DELAY_MS);
943	>	}
944	>	}
945	>
946	>	public class SmallRunnable extends CheckedRunnable {
947	>	protected void realRun() throws Throwable {
948	>	delay(SMALL_DELAY_MS);
949	>	}
950	>	}
951	>
952	>	public class SmallPossiblyInterruptedRunnable extends CheckedRunnable {
953	>	protected void realRun() {
954		try {
955	<	Thread.sleep(MEDIUM_DELAY_MS);
956	<	}
957	<	catch(InterruptedException success) {
958	<	}
955	>	delay(SMALL_DELAY_MS);
956	>	} catch (InterruptedException ok) {}
957	>	}
958	>	}
959	>
960	>	public class SmallCallable extends CheckedCallable {
961	>	protected Object realCall() throws InterruptedException {
962	>	delay(SMALL_DELAY_MS);
963	>	return Boolean.TRUE;
964	>	}
965	>	}
966	>
967	>	public class MediumRunnable extends CheckedRunnable {
968	>	protected void realRun() throws Throwable {
969	>	delay(MEDIUM_DELAY_MS);
970	>	}
971	>	}
972	>
973	>	public class MediumInterruptedRunnable extends CheckedInterruptedRunnable {
974	>	protected void realRun() throws InterruptedException {
975	>	delay(MEDIUM_DELAY_MS);
976	>	}
977	>	}
978	>
979	>	public Runnable possiblyInterruptedRunnable(final long timeoutMillis) {
980	>	return new CheckedRunnable() {
981	>	protected void realRun() {
982	>	try {
983	>	delay(timeoutMillis);
984	>	} catch (InterruptedException ok) {}
985	>	}};
986	>	}
987	>
988	>	public class MediumPossiblyInterruptedRunnable extends CheckedRunnable {
989	>	protected void realRun() {
990	>	try {
991	>	delay(MEDIUM_DELAY_MS);
992	>	} catch (InterruptedException ok) {}
993	>	}
994	>	}
995	>
996	>	public class LongPossiblyInterruptedRunnable extends CheckedRunnable {
997	>	protected void realRun() {
998	>	try {
999	>	delay(LONG_DELAY_MS);
1000	>	} catch (InterruptedException ok) {}
1001		}
1002		}
1003
1004		/**
1005		* For use as ThreadFactory in constructors
1006		*/
1007	<	static class SimpleThreadFactory implements ThreadFactory{
1008	<	public Thread newThread(Runnable r){
1007	>	public static class SimpleThreadFactory implements ThreadFactory {
1008	>	public Thread newThread(Runnable r) {
1009		return new Thread(r);
1010	<	}
1010	>	}
1011		}
1012
1013	<	static class TrackedRunnable implements Runnable {
1014	<	volatile boolean done = false;
1013	>	public interface TrackedRunnable extends Runnable {
1014	>	boolean isDone();
1015	>	}
1016	>
1017	>	public static TrackedRunnable trackedRunnable(final long timeoutMillis) {
1018	>	return new TrackedRunnable() {
1019	>	private volatile boolean done = false;
1020	>	public boolean isDone() { return done; }
1021	>	public void run() {
1022	>	try {
1023	>	delay(timeoutMillis);
1024	>	done = true;
1025	>	} catch (InterruptedException ok) {}
1026	>	}
1027	>	};
1028	>	}
1029	>
1030	>	public static class TrackedShortRunnable implements Runnable {
1031	>	public volatile boolean done = false;
1032		public void run() {
1033		try {
1034	<	Thread.sleep(SMALL_DELAY_MS);
1034	>	delay(SHORT_DELAY_MS);
1035		done = true;
1036	<	} catch(Exception e){
1037	<	}
1036	>	} catch (InterruptedException ok) {}
1037	>	}
1038	>	}
1039	>
1040	>	public static class TrackedSmallRunnable implements Runnable {
1041	>	public volatile boolean done = false;
1042	>	public void run() {
1043	>	try {
1044	>	delay(SMALL_DELAY_MS);
1045	>	done = true;
1046	>	} catch (InterruptedException ok) {}
1047	>	}
1048	>	}
1049	>
1050	>	public static class TrackedMediumRunnable implements Runnable {
1051	>	public volatile boolean done = false;
1052	>	public void run() {
1053	>	try {
1054	>	delay(MEDIUM_DELAY_MS);
1055	>	done = true;
1056	>	} catch (InterruptedException ok) {}
1057	>	}
1058	>	}
1059	>
1060	>	public static class TrackedLongRunnable implements Runnable {
1061	>	public volatile boolean done = false;
1062	>	public void run() {
1063	>	try {
1064	>	delay(LONG_DELAY_MS);
1065	>	done = true;
1066	>	} catch (InterruptedException ok) {}
1067	>	}
1068	>	}
1069	>
1070	>	public static class TrackedNoOpRunnable implements Runnable {
1071	>	public volatile boolean done = false;
1072	>	public void run() {
1073	>	done = true;
1074		}
1075		}
1076
1077	<	static class TrackedCallable implements Callable {
1078	<	volatile boolean done = false;
1077	>	public static class TrackedCallable implements Callable {
1078	>	public volatile boolean done = false;
1079		public Object call() {
1080		try {
1081	<	Thread.sleep(SMALL_DELAY_MS);
1081	>	delay(SMALL_DELAY_MS);
1082		done = true;
1083	<	} catch(Exception e){
361	<	}
1083	>	} catch (InterruptedException ok) {}
1084		return Boolean.TRUE;
1085		}
1086		}
1087
1088		/**
1089	+	* Analog of CheckedRunnable for RecursiveAction
1090	+	*/
1091	+	public abstract class CheckedRecursiveAction extends RecursiveAction {
1092	+	protected abstract void realCompute() throws Throwable;
1093	+
1094	+	public final void compute() {
1095	+	try {
1096	+	realCompute();
1097	+	} catch (Throwable t) {
1098	+	threadUnexpectedException(t);
1099	+	}
1100	+	}
1101	+	}
1102	+
1103	+	/**
1104	+	* Analog of CheckedCallable for RecursiveTask
1105	+	*/
1106	+	public abstract class CheckedRecursiveTask<T> extends RecursiveTask<T> {
1107	+	protected abstract T realCompute() throws Throwable;
1108	+
1109	+	public final T compute() {
1110	+	try {
1111	+	return realCompute();
1112	+	} catch (Throwable t) {
1113	+	threadUnexpectedException(t);
1114	+	return null;
1115	+	}
1116	+	}
1117	+	}
1118	+
1119	+	/**
1120		* For use as RejectedExecutionHandler in constructors
1121		*/
1122	<	static class NoOpREHandler implements RejectedExecutionHandler{
1123	<	public void rejectedExecution(Runnable r, ThreadPoolExecutor executor){}
1122	>	public static class NoOpREHandler implements RejectedExecutionHandler {
1123	>	public void rejectedExecution(Runnable r,
1124	>	ThreadPoolExecutor executor) {}
1125	>	}
1126	>
1127	>	/**
1128	>	* A CyclicBarrier that uses timed await and fails with
1129	>	* AssertionFailedErrors instead of throwing checked exceptions.
1130	>	*/
1131	>	public class CheckedBarrier extends CyclicBarrier {
1132	>	public CheckedBarrier(int parties) { super(parties); }
1133	>
1134	>	public int await() {
1135	>	try {
1136	>	return super.await(2 * LONG_DELAY_MS, MILLISECONDS);
1137	>	} catch (TimeoutException e) {
1138	>	throw new AssertionFailedError("timed out");
1139	>	} catch (Exception e) {
1140	>	AssertionFailedError afe =
1141	>	new AssertionFailedError("Unexpected exception: " + e);
1142	>	afe.initCause(e);
1143	>	throw afe;
1144	>	}
1145	>	}
1146	>	}
1147	>
1148	>	void checkEmpty(BlockingQueue q) {
1149	>	try {
1150	>	assertTrue(q.isEmpty());
1151	>	assertEquals(0, q.size());
1152	>	assertNull(q.peek());
1153	>	assertNull(q.poll());
1154	>	assertNull(q.poll(0, MILLISECONDS));
1155	>	assertEquals(q.toString(), "[]");
1156	>	assertTrue(Arrays.equals(q.toArray(), new Object[0]));
1157	>	assertFalse(q.iterator().hasNext());
1158	>	try {
1159	>	q.element();
1160	>	shouldThrow();
1161	>	} catch (NoSuchElementException success) {}
1162	>	try {
1163	>	q.iterator().next();
1164	>	shouldThrow();
1165	>	} catch (NoSuchElementException success) {}
1166	>	try {
1167	>	q.remove();
1168	>	shouldThrow();
1169	>	} catch (NoSuchElementException success) {}
1170	>	} catch (InterruptedException ie) {
1171	>	threadUnexpectedException(ie);
1172	>	}
1173	>	}
1174	>
1175	>	@SuppressWarnings("unchecked")
1176	>	<T> T serialClone(T o) {
1177	>	try {
1178	>	ByteArrayOutputStream bos = new ByteArrayOutputStream();
1179	>	ObjectOutputStream oos = new ObjectOutputStream(bos);
1180	>	oos.writeObject(o);
1181	>	oos.flush();
1182	>	oos.close();
1183	>	ObjectInputStream ois = new ObjectInputStream
1184	>	(new ByteArrayInputStream(bos.toByteArray()));
1185	>	T clone = (T) ois.readObject();
1186	>	assertSame(o.getClass(), clone.getClass());
1187	>	return clone;
1188	>	} catch (Throwable t) {
1189	>	threadUnexpectedException(t);
1190	>	return null;
1191	>	}
1192		}
372	–
373	–
1193		}

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