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

Comparing jsr166/src/test/tck/JSR166TestCase.java (file contents):
Revision 1.222 by jsr166, Fri May 12 18:12:51 2017 UTC vs.
Revision 1.248 by jsr166, Sat Nov 24 21:14:51 2018 UTC

#	Line 66 | Line 66 | import java.util.Arrays;
66		import java.util.Collection;
67		import java.util.Collections;
68		import java.util.Date;
69	+	import java.util.Deque;
70		import java.util.Enumeration;
71	+	import java.util.HashSet;
72		import java.util.Iterator;
73		import java.util.List;
74		import java.util.NoSuchElementException;
75		import java.util.PropertyPermission;
76	+	import java.util.Set;
77		import java.util.concurrent.BlockingQueue;
78		import java.util.concurrent.Callable;
79		import java.util.concurrent.CountDownLatch;
80		import java.util.concurrent.CyclicBarrier;
81		import java.util.concurrent.ExecutionException;
82	+	import java.util.concurrent.Executor;
83		import java.util.concurrent.Executors;
84		import java.util.concurrent.ExecutorService;
85		import java.util.concurrent.ForkJoinPool;
86		import java.util.concurrent.Future;
87	+	import java.util.concurrent.FutureTask;
88		import java.util.concurrent.RecursiveAction;
89		import java.util.concurrent.RecursiveTask;
90	+	import java.util.concurrent.RejectedExecutionException;
91		import java.util.concurrent.RejectedExecutionHandler;
92		import java.util.concurrent.Semaphore;
93	+	import java.util.concurrent.ScheduledExecutorService;
94	+	import java.util.concurrent.ScheduledFuture;
95		import java.util.concurrent.SynchronousQueue;
96		import java.util.concurrent.ThreadFactory;
97		import java.util.concurrent.ThreadLocalRandom;
98		import java.util.concurrent.ThreadPoolExecutor;
99	+	import java.util.concurrent.TimeUnit;
100		import java.util.concurrent.TimeoutException;
101		import java.util.concurrent.atomic.AtomicBoolean;
102		import java.util.concurrent.atomic.AtomicReference;
103		import java.util.regex.Pattern;
104
96	–	import junit.framework.AssertionFailedError;
105		import junit.framework.Test;
106		import junit.framework.TestCase;
107		import junit.framework.TestResult;
#	Line 109 | Line 117 | import junit.framework.TestSuite;
117		*
118		* <ol>
119		*
120	<	* <li>All assertions in code running in generated threads must use
121	<	* the forms {@link #threadFail}, {@link #threadAssertTrue}, {@link
122	<	* #threadAssertEquals}, or {@link #threadAssertNull}, (not
123	<	* {@code fail}, {@code assertTrue}, etc.) It is OK (but not
124	<	* particularly recommended) for other code to use these forms too.
125	<	* Only the most typically used JUnit assertion methods are defined
126	<	* this way, but enough to live with.
120	>	* <li>All code not running in the main test thread (manually spawned threads
121	>	* or the common fork join pool) must be checked for failure (and completion!).
122	>	* Mechanisms that can be used to ensure this are:
123	>	*   <ol>
124	>	*   <li>Signalling via a synchronizer like AtomicInteger or CountDownLatch
125	>	*    that the task completed normally, which is checked before returning from
126	>	*    the test method in the main thread.
127	>	*   <li>Using the forms {@link #threadFail}, {@link #threadAssertTrue},
128	>	*    or {@link #threadAssertNull}, (not {@code fail}, {@code assertTrue}, etc.)
129	>	*    Only the most typically used JUnit assertion methods are defined
130	>	*    this way, but enough to live with.
131	>	*   <li>Recording failure explicitly using {@link #threadUnexpectedException}
132	>	*    or {@link #threadRecordFailure}.
133	>	*   <li>Using a wrapper like CheckedRunnable that uses one the mechanisms above.
134	>	*   </ol>
135		*
136		* <li>If you override {@link #setUp} or {@link #tearDown}, make sure
137		* to invoke {@code super.setUp} and {@code super.tearDown} within
#	Line 413 | Line 429 | public class JSR166TestCase extends Test
429		for (String testClassName : testClassNames) {
430		try {
431		Class<?> testClass = Class.forName(testClassName);
432	<	Method m = testClass.getDeclaredMethod("suite",
417	<	new Class<?>[0]);
432	>	Method m = testClass.getDeclaredMethod("suite");
433		suite.addTest(newTestSuite((Test)m.invoke(null)));
434	<	} catch (Exception e) {
435	<	throw new Error("Missing test class", e);
434	>	} catch (ReflectiveOperationException e) {
435	>	throw new AssertionError("Missing test class", e);
436		}
437		}
438		}
#	Line 439 | Line 454 | public class JSR166TestCase extends Test
454		}
455		}
456
457	<	public static boolean atLeastJava6() { return JAVA_CLASS_VERSION >= 50.0; }
458	<	public static boolean atLeastJava7() { return JAVA_CLASS_VERSION >= 51.0; }
459	<	public static boolean atLeastJava8() { return JAVA_CLASS_VERSION >= 52.0; }
460	<	public static boolean atLeastJava9() {
461	<	return JAVA_CLASS_VERSION >= 53.0
462	<	// As of 2015-09, java9 still uses 52.0 class file version
448	<	|| JAVA_SPECIFICATION_VERSION.matches("^(1\\.)?(9|[0-9][0-9])$");
449	<	}
450	<	public static boolean atLeastJava10() {
451	<	return JAVA_CLASS_VERSION >= 54.0
452	<	|| JAVA_SPECIFICATION_VERSION.matches("^(1\\.)?[0-9][0-9]$");
453	<	}
457	>	public static boolean atLeastJava6()  { return JAVA_CLASS_VERSION >= 50.0; }
458	>	public static boolean atLeastJava7()  { return JAVA_CLASS_VERSION >= 51.0; }
459	>	public static boolean atLeastJava8()  { return JAVA_CLASS_VERSION >= 52.0; }
460	>	public static boolean atLeastJava9()  { return JAVA_CLASS_VERSION >= 53.0; }
461	>	public static boolean atLeastJava10() { return JAVA_CLASS_VERSION >= 54.0; }
462	>	public static boolean atLeastJava11() { return JAVA_CLASS_VERSION >= 55.0; }
463
464		/**
465		* Collects all JSR166 unit tests as one suite.
#	Line 538 | Line 547 | public class JSR166TestCase extends Test
547		"DoubleAdderTest",
548		"ForkJoinPool8Test",
549		"ForkJoinTask8Test",
550	+	"HashMapTest",
551		"LinkedBlockingDeque8Test",
552		"LinkedBlockingQueue8Test",
553		"LongAccumulatorTest",
#	Line 600 | Line 610 | public class JSR166TestCase extends Test
610		for (String methodName : testMethodNames(testClass))
611		suite.addTest((Test) c.newInstance(data, methodName));
612		return suite;
613	<	} catch (Exception e) {
614	<	throw new Error(e);
613	>	} catch (ReflectiveOperationException e) {
614	>	throw new AssertionError(e);
615		}
616		}
617
#	Line 617 | Line 627 | public class JSR166TestCase extends Test
627		if (atLeastJava8()) {
628		String name = testClass.getName();
629		String name8 = name.replaceAll("Test$", "8Test");
630	<	if (name.equals(name8)) throw new Error(name);
630	>	if (name.equals(name8)) throw new AssertionError(name);
631		try {
632		return (Test)
633		Class.forName(name8)
634	<	.getMethod("testSuite", new Class[] { dataClass })
634	>	.getMethod("testSuite", dataClass)
635		.invoke(null, data);
636	<	} catch (Exception e) {
637	<	throw new Error(e);
636	>	} catch (ReflectiveOperationException e) {
637	>	throw new AssertionError(e);
638		}
639		} else {
640		return new TestSuite();
#	Line 638 | Line 648 | public class JSR166TestCase extends Test
648		public static long MEDIUM_DELAY_MS;
649		public static long LONG_DELAY_MS;
650
651	+	private static final long RANDOM_TIMEOUT;
652	+	private static final long RANDOM_EXPIRED_TIMEOUT;
653	+	private static final TimeUnit RANDOM_TIMEUNIT;
654	+	static {
655	+	ThreadLocalRandom rnd = ThreadLocalRandom.current();
656	+	long[] timeouts = { Long.MIN_VALUE, -1, 0, 1, Long.MAX_VALUE };
657	+	RANDOM_TIMEOUT = timeouts[rnd.nextInt(timeouts.length)];
658	+	RANDOM_EXPIRED_TIMEOUT = timeouts[rnd.nextInt(3)];
659	+	TimeUnit[] timeUnits = TimeUnit.values();
660	+	RANDOM_TIMEUNIT = timeUnits[rnd.nextInt(timeUnits.length)];
661	+	}
662	+
663	+	/**
664	+	* Returns a timeout for use when any value at all will do.
665	+	*/
666	+	static long randomTimeout() { return RANDOM_TIMEOUT; }
667	+
668	+	/**
669	+	* Returns a timeout that means "no waiting", i.e. not positive.
670	+	*/
671	+	static long randomExpiredTimeout() { return RANDOM_EXPIRED_TIMEOUT; }
672	+
673	+	/**
674	+	* Returns a random non-null TimeUnit.
675	+	*/
676	+	static TimeUnit randomTimeUnit() { return RANDOM_TIMEUNIT; }
677	+
678		/**
679		* Returns the shortest timed delay. This can be scaled up for
680		* slow machines using the jsr166.delay.factor system property,
#	Line 658 | Line 695 | public class JSR166TestCase extends Test
695		LONG_DELAY_MS   = SHORT_DELAY_MS * 200;
696		}
697
698	+	private static final long TIMEOUT_DELAY_MS
699	+	= (long) (12.0 * Math.cbrt(delayFactor));
700	+
701		/**
702	<	* Returns a timeout in milliseconds to be used in tests that
703	<	* verify that operations block or time out.
702	>	* Returns a timeout in milliseconds to be used in tests that verify
703	>	* that operations block or time out.  We want this to be longer
704	>	* than the OS scheduling quantum, but not too long, so don't scale
705	>	* linearly with delayFactor; we use "crazy" cube root instead.
706		*/
707	<	long timeoutMillis() {
708	<	return SHORT_DELAY_MS / 4;
707	>	static long timeoutMillis() {
708	>	return TIMEOUT_DELAY_MS;
709		}
710
711		/**
#	Line 701 | Line 743 | public class JSR166TestCase extends Test
743		String msg = toString() + ": " + String.format(format, args);
744		System.err.println(msg);
745		dumpTestThreads();
746	<	throw new AssertionFailedError(msg);
746	>	throw new AssertionError(msg);
747		}
748
749		/**
#	Line 722 | Line 764 | public class JSR166TestCase extends Test
764		throw (RuntimeException) t;
765		else if (t instanceof Exception)
766		throw (Exception) t;
767	<	else {
768	<	AssertionFailedError afe =
727	<	new AssertionFailedError(t.toString());
728	<	afe.initCause(t);
729	<	throw afe;
730	<	}
767	>	else
768	>	throw new AssertionError(t.toString(), t);
769		}
770
771		if (Thread.interrupted())
#	Line 761 | Line 799 | public class JSR166TestCase extends Test
799
800		/**
801		* Just like fail(reason), but additionally recording (using
802	<	* threadRecordFailure) any AssertionFailedError thrown, so that
803	<	* the current testcase will fail.
802	>	* threadRecordFailure) any AssertionError thrown, so that the
803	>	* current testcase will fail.
804		*/
805		public void threadFail(String reason) {
806		try {
807		fail(reason);
808	<	} catch (AssertionFailedError t) {
809	<	threadRecordFailure(t);
810	<	throw t;
808	>	} catch (AssertionError fail) {
809	>	threadRecordFailure(fail);
810	>	throw fail;
811		}
812		}
813
814		/**
815		* Just like assertTrue(b), but additionally recording (using
816	<	* threadRecordFailure) any AssertionFailedError thrown, so that
817	<	* the current testcase will fail.
816	>	* threadRecordFailure) any AssertionError thrown, so that the
817	>	* current testcase will fail.
818		*/
819		public void threadAssertTrue(boolean b) {
820		try {
821		assertTrue(b);
822	<	} catch (AssertionFailedError t) {
823	<	threadRecordFailure(t);
824	<	throw t;
822	>	} catch (AssertionError fail) {
823	>	threadRecordFailure(fail);
824	>	throw fail;
825		}
826		}
827
828		/**
829		* Just like assertFalse(b), but additionally recording (using
830	<	* threadRecordFailure) any AssertionFailedError thrown, so that
831	<	* the current testcase will fail.
830	>	* threadRecordFailure) any AssertionError thrown, so that the
831	>	* current testcase will fail.
832		*/
833		public void threadAssertFalse(boolean b) {
834		try {
835		assertFalse(b);
836	<	} catch (AssertionFailedError t) {
837	<	threadRecordFailure(t);
838	<	throw t;
836	>	} catch (AssertionError fail) {
837	>	threadRecordFailure(fail);
838	>	throw fail;
839		}
840		}
841
842		/**
843		* Just like assertNull(x), but additionally recording (using
844	<	* threadRecordFailure) any AssertionFailedError thrown, so that
845	<	* the current testcase will fail.
844	>	* threadRecordFailure) any AssertionError thrown, so that the
845	>	* current testcase will fail.
846		*/
847		public void threadAssertNull(Object x) {
848		try {
849		assertNull(x);
850	<	} catch (AssertionFailedError t) {
851	<	threadRecordFailure(t);
852	<	throw t;
850	>	} catch (AssertionError fail) {
851	>	threadRecordFailure(fail);
852	>	throw fail;
853		}
854		}
855
856		/**
857		* Just like assertEquals(x, y), but additionally recording (using
858	<	* threadRecordFailure) any AssertionFailedError thrown, so that
859	<	* the current testcase will fail.
858	>	* threadRecordFailure) any AssertionError thrown, so that the
859	>	* current testcase will fail.
860		*/
861		public void threadAssertEquals(long x, long y) {
862		try {
863		assertEquals(x, y);
864	<	} catch (AssertionFailedError t) {
865	<	threadRecordFailure(t);
866	<	throw t;
864	>	} catch (AssertionError fail) {
865	>	threadRecordFailure(fail);
866	>	throw fail;
867		}
868		}
869
870		/**
871		* Just like assertEquals(x, y), but additionally recording (using
872	<	* threadRecordFailure) any AssertionFailedError thrown, so that
873	<	* the current testcase will fail.
872	>	* threadRecordFailure) any AssertionError thrown, so that the
873	>	* current testcase will fail.
874		*/
875		public void threadAssertEquals(Object x, Object y) {
876		try {
877		assertEquals(x, y);
878	<	} catch (AssertionFailedError fail) {
878	>	} catch (AssertionError fail) {
879		threadRecordFailure(fail);
880		throw fail;
881		} catch (Throwable fail) {
#	Line 847 | Line 885 | public class JSR166TestCase extends Test
885
886		/**
887		* Just like assertSame(x, y), but additionally recording (using
888	<	* threadRecordFailure) any AssertionFailedError thrown, so that
889	<	* the current testcase will fail.
888	>	* threadRecordFailure) any AssertionError thrown, so that the
889	>	* current testcase will fail.
890		*/
891		public void threadAssertSame(Object x, Object y) {
892		try {
893		assertSame(x, y);
894	<	} catch (AssertionFailedError fail) {
894	>	} catch (AssertionError fail) {
895		threadRecordFailure(fail);
896		throw fail;
897		}
#	Line 875 | Line 913 | public class JSR166TestCase extends Test
913
914		/**
915		* Records the given exception using {@link #threadRecordFailure},
916	<	* then rethrows the exception, wrapping it in an
917	<	* AssertionFailedError if necessary.
916	>	* then rethrows the exception, wrapping it in an AssertionError
917	>	* if necessary.
918		*/
919		public void threadUnexpectedException(Throwable t) {
920		threadRecordFailure(t);
#	Line 885 | Line 923 | public class JSR166TestCase extends Test
923		throw (RuntimeException) t;
924		else if (t instanceof Error)
925		throw (Error) t;
926	<	else {
927	<	AssertionFailedError afe =
890	<	new AssertionFailedError("unexpected exception: " + t);
891	<	afe.initCause(t);
892	<	throw afe;
893	<	}
926	>	else
927	>	throw new AssertionError("unexpected exception: " + t, t);
928		}
929
930		/**
#	Line 1058 | Line 1092 | public class JSR166TestCase extends Test
1092		}
1093
1094		/**
1095	<	* Checks that thread does not terminate within the default
1062	<	* millisecond delay of {@code timeoutMillis()}.
1063	<	*/
1064	<	void assertThreadStaysAlive(Thread thread) {
1065	<	assertThreadStaysAlive(thread, timeoutMillis());
1066	<	}
1067	<
1068	<	/**
1069	<	* Checks that thread does not terminate within the given millisecond delay.
1070	<	*/
1071	<	void assertThreadStaysAlive(Thread thread, long millis) {
1072	<	try {
1073	<	// No need to optimize the failing case via Thread.join.
1074	<	delay(millis);
1075	<	assertTrue(thread.isAlive());
1076	<	} catch (InterruptedException fail) {
1077	<	threadFail("Unexpected InterruptedException");
1078	<	}
1079	<	}
1080	<
1081	<	/**
1082	<	* Checks that the threads do not terminate within the default
1083	<	* millisecond delay of {@code timeoutMillis()}.
1084	<	*/
1085	<	void assertThreadsStayAlive(Thread... threads) {
1086	<	assertThreadsStayAlive(timeoutMillis(), threads);
1087	<	}
1088	<
1089	<	/**
1090	<	* Checks that the threads do not terminate within the given millisecond delay.
1095	>	* Checks that thread eventually enters the expected blocked thread state.
1096		*/
1097	<	void assertThreadsStayAlive(long millis, Thread... threads) {
1098	<	try {
1099	<	// No need to optimize the failing case via Thread.join.
1100	<	delay(millis);
1101	<	for (Thread thread : threads)
1102	<	assertTrue(thread.isAlive());
1103	<	} catch (InterruptedException fail) {
1104	<	threadFail("Unexpected InterruptedException");
1097	>	void assertThreadBlocks(Thread thread, Thread.State expected) {
1098	>	// always sleep at least 1 ms, with high probability avoiding
1099	>	// transitory states
1100	>	for (long retries = LONG_DELAY_MS * 3 / 4; retries-->0; ) {
1101	>	try { delay(1); }
1102	>	catch (InterruptedException fail) {
1103	>	throw new AssertionError("Unexpected InterruptedException", fail);
1104	>	}
1105	>	Thread.State s = thread.getState();
1106	>	if (s == expected)
1107	>	return;
1108	>	else if (s == Thread.State.TERMINATED)
1109	>	fail("Unexpected thread termination");
1110		}
1111	+	fail("timed out waiting for thread to enter thread state " + expected);
1112		}
1113
1114		/**
#	Line 1275 | Line 1286 | public class JSR166TestCase extends Test
1286
1287		/**
1288		* Sleeps until the given time has elapsed.
1289	<	* Throws AssertionFailedError if interrupted.
1289	>	* Throws AssertionError if interrupted.
1290		*/
1291		static void sleep(long millis) {
1292		try {
1293		delay(millis);
1294		} catch (InterruptedException fail) {
1295	<	AssertionFailedError afe =
1285	<	new AssertionFailedError("Unexpected InterruptedException");
1286	<	afe.initCause(fail);
1287	<	throw afe;
1295	>	throw new AssertionError("Unexpected InterruptedException", fail);
1296		}
1297		}
1298
1299		/**
1300		* Spin-waits up to the specified number of milliseconds for the given
1301		* thread to enter a wait state: BLOCKED, WAITING, or TIMED_WAITING.
1302	+	* @param waitingForGodot if non-null, an additional condition to satisfy
1303		*/
1304	<	void waitForThreadToEnterWaitState(Thread thread, long timeoutMillis) {
1305	<	long startTime = 0L;
1306	<	for (;;) {
1307	<	Thread.State s = thread.getState();
1308	<	if (s == Thread.State.BLOCKED ||
1309	<	s == Thread.State.WAITING ||
1310	<	s == Thread.State.TIMED_WAITING)
1311	<	return;
1312	<	else if (s == Thread.State.TERMINATED)
1304	>	void waitForThreadToEnterWaitState(Thread thread, long timeoutMillis,
1305	>	Callable<Boolean> waitingForGodot) {
1306	>	for (long startTime = 0L;;) {
1307	>	switch (thread.getState()) {
1308	>	case BLOCKED: case WAITING: case TIMED_WAITING:
1309	>	try {
1310	>	if (waitingForGodot == null || waitingForGodot.call())
1311	>	return;
1312	>	} catch (Throwable fail) { threadUnexpectedException(fail); }
1313	>	break;
1314	>	case TERMINATED:
1315		fail("Unexpected thread termination");
1316	<	else if (startTime == 0L)
1316	>	}
1317	>
1318	>	if (startTime == 0L)
1319		startTime = System.nanoTime();
1320		else if (millisElapsedSince(startTime) > timeoutMillis) {
1321	<	threadAssertTrue(thread.isAlive());
1322	<	fail("timed out waiting for thread to enter wait state");
1321	>	assertTrue(thread.isAlive());
1322	>	if (waitingForGodot == null
1323	>	|| thread.getState() == Thread.State.RUNNABLE)
1324	>	fail("timed out waiting for thread to enter wait state");
1325	>	else
1326	>	fail("timed out waiting for condition, thread state="
1327	>	+ thread.getState());
1328		}
1329		Thread.yield();
1330		}
#	Line 1314 | Line 1332 | public class JSR166TestCase extends Test
1332
1333		/**
1334		* Spin-waits up to the specified number of milliseconds for the given
1335	<	* thread to enter a wait state: BLOCKED, WAITING, or TIMED_WAITING,
1318	<	* and additionally satisfy the given condition.
1335	>	* thread to enter a wait state: BLOCKED, WAITING, or TIMED_WAITING.
1336		*/
1337	<	void waitForThreadToEnterWaitState(
1338	<	Thread thread, long timeoutMillis, Callable<Boolean> waitingForGodot) {
1322	<	long startTime = 0L;
1323	<	for (;;) {
1324	<	Thread.State s = thread.getState();
1325	<	if (s == Thread.State.BLOCKED ||
1326	<	s == Thread.State.WAITING ||
1327	<	s == Thread.State.TIMED_WAITING) {
1328	<	try {
1329	<	if (waitingForGodot.call())
1330	<	return;
1331	<	} catch (Throwable fail) { threadUnexpectedException(fail); }
1332	<	}
1333	<	else if (s == Thread.State.TERMINATED)
1334	<	fail("Unexpected thread termination");
1335	<	else if (startTime == 0L)
1336	<	startTime = System.nanoTime();
1337	<	else if (millisElapsedSince(startTime) > timeoutMillis) {
1338	<	threadAssertTrue(thread.isAlive());
1339	<	fail("timed out waiting for thread to enter wait state");
1340	<	}
1341	<	Thread.yield();
1342	<	}
1337	>	void waitForThreadToEnterWaitState(Thread thread, long timeoutMillis) {
1338	>	waitForThreadToEnterWaitState(thread, timeoutMillis, null);
1339		}
1340
1341		/**
#	Line 1347 | Line 1343 | public class JSR166TestCase extends Test
1343		* enter a wait state: BLOCKED, WAITING, or TIMED_WAITING.
1344		*/
1345		void waitForThreadToEnterWaitState(Thread thread) {
1346	<	waitForThreadToEnterWaitState(thread, LONG_DELAY_MS);
1346	>	waitForThreadToEnterWaitState(thread, LONG_DELAY_MS, null);
1347		}
1348
1349		/**
#	Line 1355 | Line 1351 | public class JSR166TestCase extends Test
1351		* enter a wait state: BLOCKED, WAITING, or TIMED_WAITING,
1352		* and additionally satisfy the given condition.
1353		*/
1354	<	void waitForThreadToEnterWaitState(
1355	<	Thread thread, Callable<Boolean> waitingForGodot) {
1354	>	void waitForThreadToEnterWaitState(Thread thread,
1355	>	Callable<Boolean> waitingForGodot) {
1356		waitForThreadToEnterWaitState(thread, LONG_DELAY_MS, waitingForGodot);
1357		}
1358
#	Line 1375 | Line 1371 | public class JSR166TestCase extends Test
1371		//             r.run();
1372		//         } catch (Throwable fail) { threadUnexpectedException(fail); }
1373		//         if (millisElapsedSince(startTime) > timeoutMillis/2)
1374	<	//             throw new AssertionFailedError("did not return promptly");
1374	>	//             throw new AssertionError("did not return promptly");
1375		//     }
1376
1377		//     void assertTerminatesPromptly(Runnable r) {
#	Line 1388 | Line 1384 | public class JSR166TestCase extends Test
1384		*/
1385		<T> void checkTimedGet(Future<T> f, T expectedValue, long timeoutMillis) {
1386		long startTime = System.nanoTime();
1387	+	T actual = null;
1388		try {
1389	<	assertEquals(expectedValue, f.get(timeoutMillis, MILLISECONDS));
1389	>	actual = f.get(timeoutMillis, MILLISECONDS);
1390		} catch (Throwable fail) { threadUnexpectedException(fail); }
1391	+	assertEquals(expectedValue, actual);
1392		if (millisElapsedSince(startTime) > timeoutMillis/2)
1393	<	throw new AssertionFailedError("timed get did not return promptly");
1393	>	throw new AssertionError("timed get did not return promptly");
1394		}
1395
1396		<T> void checkTimedGet(Future<T> f, T expectedValue) {
#	Line 1450 | Line 1448 | public class JSR166TestCase extends Test
1448		}
1449		}
1450
1453	–	public abstract class RunnableShouldThrow implements Runnable {
1454	–	protected abstract void realRun() throws Throwable;
1455	–
1456	–	final Class<?> exceptionClass;
1457	–
1458	–	<T extends Throwable> RunnableShouldThrow(Class<T> exceptionClass) {
1459	–	this.exceptionClass = exceptionClass;
1460	–	}
1461	–
1462	–	public final void run() {
1463	–	try {
1464	–	realRun();
1465	–	threadShouldThrow(exceptionClass.getSimpleName());
1466	–	} catch (Throwable t) {
1467	–	if (! exceptionClass.isInstance(t))
1468	–	threadUnexpectedException(t);
1469	–	}
1470	–	}
1471	–	}
1472	–
1451		public abstract class ThreadShouldThrow extends Thread {
1452		protected abstract void realRun() throws Throwable;
1453
#	Line 1482 | Line 1460 | public class JSR166TestCase extends Test
1460		public final void run() {
1461		try {
1462		realRun();
1485	–	threadShouldThrow(exceptionClass.getSimpleName());
1463		} catch (Throwable t) {
1464		if (! exceptionClass.isInstance(t))
1465		threadUnexpectedException(t);
1466	+	return;
1467		}
1468	+	threadShouldThrow(exceptionClass.getSimpleName());
1469		}
1470		}
1471
#	Line 1496 | Line 1475 | public class JSR166TestCase extends Test
1475		public final void run() {
1476		try {
1477		realRun();
1499	–	threadShouldThrow("InterruptedException");
1478		} catch (InterruptedException success) {
1479		threadAssertFalse(Thread.interrupted());
1480	+	return;
1481		} catch (Throwable fail) {
1482		threadUnexpectedException(fail);
1483		}
1484	+	threadShouldThrow("InterruptedException");
1485		}
1486		}
1487
#	Line 1513 | Line 1493 | public class JSR166TestCase extends Test
1493		return realCall();
1494		} catch (Throwable fail) {
1495		threadUnexpectedException(fail);
1516	–	return null;
1496		}
1497	<	}
1519	<	}
1520	<
1521	<	public abstract class CheckedInterruptedCallable<T>
1522	<	implements Callable<T> {
1523	<	protected abstract T realCall() throws Throwable;
1524	<
1525	<	public final T call() {
1526	<	try {
1527	<	T result = realCall();
1528	<	threadShouldThrow("InterruptedException");
1529	<	return result;
1530	<	} catch (InterruptedException success) {
1531	<	threadAssertFalse(Thread.interrupted());
1532	<	} catch (Throwable fail) {
1533	<	threadUnexpectedException(fail);
1534	<	}
1535	<	return null;
1497	>	throw new AssertionError("unreached");
1498		}
1499		}
1500
#	Line 1589 | Line 1551 | public class JSR166TestCase extends Test
1551		}
1552
1553		public void await(CountDownLatch latch, long timeoutMillis) {
1554	+	boolean timedOut = false;
1555		try {
1556	<	if (!latch.await(timeoutMillis, MILLISECONDS))
1594	<	fail("timed out waiting for CountDownLatch for "
1595	<	+ (timeoutMillis/1000) + " sec");
1556	>	timedOut = !latch.await(timeoutMillis, MILLISECONDS);
1557		} catch (Throwable fail) {
1558		threadUnexpectedException(fail);
1559		}
1560	+	if (timedOut)
1561	+	fail("timed out waiting for CountDownLatch for "
1562	+	+ (timeoutMillis/1000) + " sec");
1563		}
1564
1565		public void await(CountDownLatch latch) {
#	Line 1603 | Line 1567 | public class JSR166TestCase extends Test
1567		}
1568
1569		public void await(Semaphore semaphore) {
1570	+	boolean timedOut = false;
1571		try {
1572	<	if (!semaphore.tryAcquire(LONG_DELAY_MS, MILLISECONDS))
1573	<	fail("timed out waiting for Semaphore for "
1574	<	+ (LONG_DELAY_MS/1000) + " sec");
1572	>	timedOut = !semaphore.tryAcquire(LONG_DELAY_MS, MILLISECONDS);
1573	>	} catch (Throwable fail) {
1574	>	threadUnexpectedException(fail);
1575	>	}
1576	>	if (timedOut)
1577	>	fail("timed out waiting for Semaphore for "
1578	>	+ (LONG_DELAY_MS/1000) + " sec");
1579	>	}
1580	>
1581	>	public void await(CyclicBarrier barrier) {
1582	>	try {
1583	>	barrier.await(LONG_DELAY_MS, MILLISECONDS);
1584		} catch (Throwable fail) {
1585		threadUnexpectedException(fail);
1586		}
#	Line 1626 | Line 1600 | public class JSR166TestCase extends Test
1600		//         long startTime = System.nanoTime();
1601		//         while (!flag.get()) {
1602		//             if (millisElapsedSince(startTime) > timeoutMillis)
1603	<	//                 throw new AssertionFailedError("timed out");
1603	>	//                 throw new AssertionError("timed out");
1604		//             Thread.yield();
1605		//         }
1606		//     }
#	Line 1635 | Line 1609 | public class JSR166TestCase extends Test
1609		public String call() { throw new NullPointerException(); }
1610		}
1611
1638	–	public static class CallableOne implements Callable<Integer> {
1639	–	public Integer call() { return one; }
1640	–	}
1641	–
1642	–	public class ShortRunnable extends CheckedRunnable {
1643	–	protected void realRun() throws Throwable {
1644	–	delay(SHORT_DELAY_MS);
1645	–	}
1646	–	}
1647	–
1648	–	public class ShortInterruptedRunnable extends CheckedInterruptedRunnable {
1649	–	protected void realRun() throws InterruptedException {
1650	–	delay(SHORT_DELAY_MS);
1651	–	}
1652	–	}
1653	–
1654	–	public class SmallRunnable extends CheckedRunnable {
1655	–	protected void realRun() throws Throwable {
1656	–	delay(SMALL_DELAY_MS);
1657	–	}
1658	–	}
1659	–
1612		public class SmallPossiblyInterruptedRunnable extends CheckedRunnable {
1613		protected void realRun() {
1614		try {
#	Line 1665 | Line 1617 | public class JSR166TestCase extends Test
1617		}
1618		}
1619
1668	–	public class SmallCallable extends CheckedCallable {
1669	–	protected Object realCall() throws InterruptedException {
1670	–	delay(SMALL_DELAY_MS);
1671	–	return Boolean.TRUE;
1672	–	}
1673	–	}
1674	–
1675	–	public class MediumRunnable extends CheckedRunnable {
1676	–	protected void realRun() throws Throwable {
1677	–	delay(MEDIUM_DELAY_MS);
1678	–	}
1679	–	}
1680	–
1681	–	public class MediumInterruptedRunnable extends CheckedInterruptedRunnable {
1682	–	protected void realRun() throws InterruptedException {
1683	–	delay(MEDIUM_DELAY_MS);
1684	–	}
1685	–	}
1686	–
1620		public Runnable possiblyInterruptedRunnable(final long timeoutMillis) {
1621		return new CheckedRunnable() {
1622		protected void realRun() {
#	Line 1693 | Line 1626 | public class JSR166TestCase extends Test
1626		}};
1627		}
1628
1696	–	public class MediumPossiblyInterruptedRunnable extends CheckedRunnable {
1697	–	protected void realRun() {
1698	–	try {
1699	–	delay(MEDIUM_DELAY_MS);
1700	–	} catch (InterruptedException ok) {}
1701	–	}
1702	–	}
1703	–
1704	–	public class LongPossiblyInterruptedRunnable extends CheckedRunnable {
1705	–	protected void realRun() {
1706	–	try {
1707	–	delay(LONG_DELAY_MS);
1708	–	} catch (InterruptedException ok) {}
1709	–	}
1710	–	}
1711	–
1629		/**
1630		* For use as ThreadFactory in constructors
1631		*/
#	Line 1722 | Line 1639 | public class JSR166TestCase extends Test
1639		boolean isDone();
1640		}
1641
1725	–	public static TrackedRunnable trackedRunnable(final long timeoutMillis) {
1726	–	return new TrackedRunnable() {
1727	–	private volatile boolean done = false;
1728	–	public boolean isDone() { return done; }
1729	–	public void run() {
1730	–	try {
1731	–	delay(timeoutMillis);
1732	–	done = true;
1733	–	} catch (InterruptedException ok) {}
1734	–	}
1735	–	};
1736	–	}
1737	–
1738	–	public static class TrackedShortRunnable implements Runnable {
1739	–	public volatile boolean done = false;
1740	–	public void run() {
1741	–	try {
1742	–	delay(SHORT_DELAY_MS);
1743	–	done = true;
1744	–	} catch (InterruptedException ok) {}
1745	–	}
1746	–	}
1747	–
1748	–	public static class TrackedSmallRunnable implements Runnable {
1749	–	public volatile boolean done = false;
1750	–	public void run() {
1751	–	try {
1752	–	delay(SMALL_DELAY_MS);
1753	–	done = true;
1754	–	} catch (InterruptedException ok) {}
1755	–	}
1756	–	}
1757	–
1758	–	public static class TrackedMediumRunnable implements Runnable {
1759	–	public volatile boolean done = false;
1760	–	public void run() {
1761	–	try {
1762	–	delay(MEDIUM_DELAY_MS);
1763	–	done = true;
1764	–	} catch (InterruptedException ok) {}
1765	–	}
1766	–	}
1767	–
1768	–	public static class TrackedLongRunnable implements Runnable {
1769	–	public volatile boolean done = false;
1770	–	public void run() {
1771	–	try {
1772	–	delay(LONG_DELAY_MS);
1773	–	done = true;
1774	–	} catch (InterruptedException ok) {}
1775	–	}
1776	–	}
1777	–
1642		public static class TrackedNoOpRunnable implements Runnable {
1643		public volatile boolean done = false;
1644		public void run() {
#	Line 1782 | Line 1646 | public class JSR166TestCase extends Test
1646		}
1647		}
1648
1785	–	public static class TrackedCallable implements Callable {
1786	–	public volatile boolean done = false;
1787	–	public Object call() {
1788	–	try {
1789	–	delay(SMALL_DELAY_MS);
1790	–	done = true;
1791	–	} catch (InterruptedException ok) {}
1792	–	return Boolean.TRUE;
1793	–	}
1794	–	}
1795	–
1649		/**
1650		* Analog of CheckedRunnable for RecursiveAction
1651		*/
#	Line 1819 | Line 1672 | public class JSR166TestCase extends Test
1672		return realCompute();
1673		} catch (Throwable fail) {
1674		threadUnexpectedException(fail);
1822	–	return null;
1675		}
1676	+	throw new AssertionError("unreached");
1677		}
1678		}
1679
#	Line 1834 | Line 1687 | public class JSR166TestCase extends Test
1687
1688		/**
1689		* A CyclicBarrier that uses timed await and fails with
1690	<	* AssertionFailedErrors instead of throwing checked exceptions.
1690	>	* AssertionErrors instead of throwing checked exceptions.
1691		*/
1692		public static class CheckedBarrier extends CyclicBarrier {
1693		public CheckedBarrier(int parties) { super(parties); }
#	Line 1843 | Line 1696 | public class JSR166TestCase extends Test
1696		try {
1697		return super.await(2 * LONG_DELAY_MS, MILLISECONDS);
1698		} catch (TimeoutException timedOut) {
1699	<	throw new AssertionFailedError("timed out");
1699	>	throw new AssertionError("timed out");
1700		} catch (Exception fail) {
1701	<	AssertionFailedError afe =
1849	<	new AssertionFailedError("Unexpected exception: " + fail);
1850	<	afe.initCause(fail);
1851	<	throw afe;
1701	>	throw new AssertionError("Unexpected exception: " + fail, fail);
1702		}
1703		}
1704		}
#	Line 1859 | Line 1709 | public class JSR166TestCase extends Test
1709		assertEquals(0, q.size());
1710		assertNull(q.peek());
1711		assertNull(q.poll());
1712	<	assertNull(q.poll(0, MILLISECONDS));
1712	>	assertNull(q.poll(randomExpiredTimeout(), randomTimeUnit()));
1713		assertEquals(q.toString(), "[]");
1714		assertTrue(Arrays.equals(q.toArray(), new Object[0]));
1715		assertFalse(q.iterator().hasNext());
#	Line 1911 | Line 1761 | public class JSR166TestCase extends Test
1761
1762		@SuppressWarnings("unchecked")
1763		<T> T serialClone(T o) {
1764	+	T clone = null;
1765		try {
1766		ObjectInputStream ois = new ObjectInputStream
1767		(new ByteArrayInputStream(serialBytes(o)));
1768	<	T clone = (T) ois.readObject();
1918	<	if (o == clone) assertImmutable(o);
1919	<	assertSame(o.getClass(), clone.getClass());
1920	<	return clone;
1768	>	clone = (T) ois.readObject();
1769		} catch (Throwable fail) {
1770		threadUnexpectedException(fail);
1923	–	return null;
1771		}
1772	+	if (o == clone) assertImmutable(o);
1773	+	else assertSame(o.getClass(), clone.getClass());
1774	+	return clone;
1775		}
1776
1777		/**
#	Line 1940 | Line 1790 | public class JSR166TestCase extends Test
1790		(new ByteArrayInputStream(bos.toByteArray()));
1791		T clone = (T) ois.readObject();
1792		if (o == clone) assertImmutable(o);
1793	<	assertSame(o.getClass(), clone.getClass());
1793	>	else assertSame(o.getClass(), clone.getClass());
1794		return clone;
1795		}
1796
#	Line 1971 | Line 1821 | public class JSR166TestCase extends Test
1821		try { throwingAction.run(); }
1822		catch (Throwable t) {
1823		threw = true;
1824	<	if (!expectedExceptionClass.isInstance(t)) {
1825	<	AssertionFailedError afe =
1826	<	new AssertionFailedError
1827	<	("Expected " + expectedExceptionClass.getName() +
1828	<	", got " + t.getClass().getName());
1979	<	afe.initCause(t);
1980	<	threadUnexpectedException(afe);
1981	<	}
1824	>	if (!expectedExceptionClass.isInstance(t))
1825	>	throw new AssertionError(
1826	>	"Expected " + expectedExceptionClass.getName() +
1827	>	", got " + t.getClass().getName(),
1828	>	t);
1829		}
1830		if (!threw)
1831		shouldThrow(expectedExceptionClass.getName());
#	Line 2010 | Line 1857 | public class JSR166TestCase extends Test
1857		static <T> void shuffle(T[] array) {
1858		Collections.shuffle(Arrays.asList(array), ThreadLocalRandom.current());
1859		}
1860	+
1861	+	/**
1862	+	* Returns the same String as would be returned by {@link
1863	+	* Object#toString}, whether or not the given object's class
1864	+	* overrides toString().
1865	+	*
1866	+	* @see System#identityHashCode
1867	+	*/
1868	+	static String identityString(Object x) {
1869	+	return x.getClass().getName()
1870	+	+ "@" + Integer.toHexString(System.identityHashCode(x));
1871	+	}
1872	+
1873	+	// --- Shared assertions for Executor tests ---
1874	+
1875	+	/**
1876	+	* Returns maximum number of tasks that can be submitted to given
1877	+	* pool (with bounded queue) before saturation (when submission
1878	+	* throws RejectedExecutionException).
1879	+	*/
1880	+	static final int saturatedSize(ThreadPoolExecutor pool) {
1881	+	BlockingQueue<Runnable> q = pool.getQueue();
1882	+	return pool.getMaximumPoolSize() + q.size() + q.remainingCapacity();
1883	+	}
1884	+
1885	+	@SuppressWarnings("FutureReturnValueIgnored")
1886	+	void assertNullTaskSubmissionThrowsNullPointerException(Executor e) {
1887	+	try {
1888	+	e.execute((Runnable) null);
1889	+	shouldThrow();
1890	+	} catch (NullPointerException success) {}
1891	+
1892	+	if (! (e instanceof ExecutorService)) return;
1893	+	ExecutorService es = (ExecutorService) e;
1894	+	try {
1895	+	es.submit((Runnable) null);
1896	+	shouldThrow();
1897	+	} catch (NullPointerException success) {}
1898	+	try {
1899	+	es.submit((Runnable) null, Boolean.TRUE);
1900	+	shouldThrow();
1901	+	} catch (NullPointerException success) {}
1902	+	try {
1903	+	es.submit((Callable) null);
1904	+	shouldThrow();
1905	+	} catch (NullPointerException success) {}
1906	+
1907	+	if (! (e instanceof ScheduledExecutorService)) return;
1908	+	ScheduledExecutorService ses = (ScheduledExecutorService) e;
1909	+	try {
1910	+	ses.schedule((Runnable) null,
1911	+	randomTimeout(), randomTimeUnit());
1912	+	shouldThrow();
1913	+	} catch (NullPointerException success) {}
1914	+	try {
1915	+	ses.schedule((Callable) null,
1916	+	randomTimeout(), randomTimeUnit());
1917	+	shouldThrow();
1918	+	} catch (NullPointerException success) {}
1919	+	try {
1920	+	ses.scheduleAtFixedRate((Runnable) null,
1921	+	randomTimeout(), LONG_DELAY_MS, MILLISECONDS);
1922	+	shouldThrow();
1923	+	} catch (NullPointerException success) {}
1924	+	try {
1925	+	ses.scheduleWithFixedDelay((Runnable) null,
1926	+	randomTimeout(), LONG_DELAY_MS, MILLISECONDS);
1927	+	shouldThrow();
1928	+	} catch (NullPointerException success) {}
1929	+	}
1930	+
1931	+	void setRejectedExecutionHandler(
1932	+	ThreadPoolExecutor p, RejectedExecutionHandler handler) {
1933	+	p.setRejectedExecutionHandler(handler);
1934	+	assertSame(handler, p.getRejectedExecutionHandler());
1935	+	}
1936	+
1937	+	void assertTaskSubmissionsAreRejected(ThreadPoolExecutor p) {
1938	+	final RejectedExecutionHandler savedHandler = p.getRejectedExecutionHandler();
1939	+	final long savedTaskCount = p.getTaskCount();
1940	+	final long savedCompletedTaskCount = p.getCompletedTaskCount();
1941	+	final int savedQueueSize = p.getQueue().size();
1942	+	final boolean stock = (p.getClass().getClassLoader() == null);
1943	+
1944	+	Runnable r = () -> {};
1945	+	Callable<Boolean> c = () -> Boolean.TRUE;
1946	+
1947	+	class Recorder implements RejectedExecutionHandler {
1948	+	public volatile Runnable r = null;
1949	+	public volatile ThreadPoolExecutor p = null;
1950	+	public void reset() { r = null; p = null; }
1951	+	public void rejectedExecution(Runnable r, ThreadPoolExecutor p) {
1952	+	assertNull(this.r);
1953	+	assertNull(this.p);
1954	+	this.r = r;
1955	+	this.p = p;
1956	+	}
1957	+	}
1958	+
1959	+	// check custom handler is invoked exactly once per task
1960	+	Recorder recorder = new Recorder();
1961	+	setRejectedExecutionHandler(p, recorder);
1962	+	for (int i = 2; i--> 0; ) {
1963	+	recorder.reset();
1964	+	p.execute(r);
1965	+	if (stock && p.getClass() == ThreadPoolExecutor.class)
1966	+	assertSame(r, recorder.r);
1967	+	assertSame(p, recorder.p);
1968	+
1969	+	recorder.reset();
1970	+	assertFalse(p.submit(r).isDone());
1971	+	if (stock) assertTrue(!((FutureTask) recorder.r).isDone());
1972	+	assertSame(p, recorder.p);
1973	+
1974	+	recorder.reset();
1975	+	assertFalse(p.submit(r, Boolean.TRUE).isDone());
1976	+	if (stock) assertTrue(!((FutureTask) recorder.r).isDone());
1977	+	assertSame(p, recorder.p);
1978	+
1979	+	recorder.reset();
1980	+	assertFalse(p.submit(c).isDone());
1981	+	if (stock) assertTrue(!((FutureTask) recorder.r).isDone());
1982	+	assertSame(p, recorder.p);
1983	+
1984	+	if (p instanceof ScheduledExecutorService) {
1985	+	ScheduledExecutorService s = (ScheduledExecutorService) p;
1986	+	ScheduledFuture<?> future;
1987	+
1988	+	recorder.reset();
1989	+	future = s.schedule(r, randomTimeout(), randomTimeUnit());
1990	+	assertFalse(future.isDone());
1991	+	if (stock) assertTrue(!((FutureTask) recorder.r).isDone());
1992	+	assertSame(p, recorder.p);
1993	+
1994	+	recorder.reset();
1995	+	future = s.schedule(c, randomTimeout(), randomTimeUnit());
1996	+	assertFalse(future.isDone());
1997	+	if (stock) assertTrue(!((FutureTask) recorder.r).isDone());
1998	+	assertSame(p, recorder.p);
1999	+
2000	+	recorder.reset();
2001	+	future = s.scheduleAtFixedRate(r, randomTimeout(), LONG_DELAY_MS, MILLISECONDS);
2002	+	assertFalse(future.isDone());
2003	+	if (stock) assertTrue(!((FutureTask) recorder.r).isDone());
2004	+	assertSame(p, recorder.p);
2005	+
2006	+	recorder.reset();
2007	+	future = s.scheduleWithFixedDelay(r, randomTimeout(), LONG_DELAY_MS, MILLISECONDS);
2008	+	assertFalse(future.isDone());
2009	+	if (stock) assertTrue(!((FutureTask) recorder.r).isDone());
2010	+	assertSame(p, recorder.p);
2011	+	}
2012	+	}
2013	+
2014	+	// Checking our custom handler above should be sufficient, but
2015	+	// we add some integration tests of standard handlers.
2016	+	final AtomicReference<Thread> thread = new AtomicReference<>();
2017	+	final Runnable setThread = () -> thread.set(Thread.currentThread());
2018	+
2019	+	setRejectedExecutionHandler(p, new ThreadPoolExecutor.AbortPolicy());
2020	+	try {
2021	+	p.execute(setThread);
2022	+	shouldThrow();
2023	+	} catch (RejectedExecutionException success) {}
2024	+	assertNull(thread.get());
2025	+
2026	+	setRejectedExecutionHandler(p, new ThreadPoolExecutor.DiscardPolicy());
2027	+	p.execute(setThread);
2028	+	assertNull(thread.get());
2029	+
2030	+	setRejectedExecutionHandler(p, new ThreadPoolExecutor.CallerRunsPolicy());
2031	+	p.execute(setThread);
2032	+	if (p.isShutdown())
2033	+	assertNull(thread.get());
2034	+	else
2035	+	assertSame(Thread.currentThread(), thread.get());
2036	+
2037	+	setRejectedExecutionHandler(p, savedHandler);
2038	+
2039	+	// check that pool was not perturbed by handlers
2040	+	assertEquals(savedTaskCount, p.getTaskCount());
2041	+	assertEquals(savedCompletedTaskCount, p.getCompletedTaskCount());
2042	+	assertEquals(savedQueueSize, p.getQueue().size());
2043	+	}
2044	+
2045	+	void assertCollectionsEquals(Collection<?> x, Collection<?> y) {
2046	+	assertEquals(x, y);
2047	+	assertEquals(y, x);
2048	+	assertEquals(x.isEmpty(), y.isEmpty());
2049	+	assertEquals(x.size(), y.size());
2050	+	if (x instanceof List) {
2051	+	assertEquals(x.toString(), y.toString());
2052	+	}
2053	+	if (x instanceof List || x instanceof Set) {
2054	+	assertEquals(x.hashCode(), y.hashCode());
2055	+	}
2056	+	if (x instanceof List || x instanceof Deque) {
2057	+	assertTrue(Arrays.equals(x.toArray(), y.toArray()));
2058	+	assertTrue(Arrays.equals(x.toArray(new Object[0]),
2059	+	y.toArray(new Object[0])));
2060	+	}
2061	+	}
2062	+
2063	+	/**
2064	+	* A weaker form of assertCollectionsEquals which does not insist
2065	+	* that the two collections satisfy Object#equals(Object), since
2066	+	* they may use identity semantics as Deques do.
2067	+	*/
2068	+	void assertCollectionsEquivalent(Collection<?> x, Collection<?> y) {
2069	+	if (x instanceof List || x instanceof Set)
2070	+	assertCollectionsEquals(x, y);
2071	+	else {
2072	+	assertEquals(x.isEmpty(), y.isEmpty());
2073	+	assertEquals(x.size(), y.size());
2074	+	assertEquals(new HashSet(x), new HashSet(y));
2075	+	if (x instanceof Deque) {
2076	+	assertTrue(Arrays.equals(x.toArray(), y.toArray()));
2077	+	assertTrue(Arrays.equals(x.toArray(new Object[0]),
2078	+	y.toArray(new Object[0])));
2079	+	}
2080	+	}
2081	+	}
2082		}

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