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

Comparing jsr166/src/test/tck/JSR166TestCase.java (file contents):
Revision 1.164 by jsr166, Sun Oct 4 18:40:57 2015 UTC vs.
Revision 1.218 by jsr166, Sun Jan 29 20:19:00 2017 UTC

#	Line 6 | Line 6
6		* Pat Fisher, Mike Judd.
7		*/
8
9	+	/*
10	+	* @test
11	+	* @summary JSR-166 tck tests (conformance testing mode)
12	+	* @build *
13	+	* @modules java.management
14	+	* @run junit/othervm/timeout=1000 JSR166TestCase
15	+	*/
16	+
17	+	/*
18	+	* @test
19	+	* @summary JSR-166 tck tests (whitebox tests allowed)
20	+	* @build *
21	+	* @modules java.base/java.util.concurrent:open
22	+	*          java.base/java.lang:open
23	+	*          java.management
24	+	* @run junit/othervm/timeout=1000
25	+	*      -Djsr166.testImplementationDetails=true
26	+	*      JSR166TestCase
27	+	* @run junit/othervm/timeout=1000
28	+	*      -Djsr166.testImplementationDetails=true
29	+	*      -Djava.util.concurrent.ForkJoinPool.common.parallelism=0
30	+	*      JSR166TestCase
31	+	* @run junit/othervm/timeout=1000
32	+	*      -Djsr166.testImplementationDetails=true
33	+	*      -Djava.util.concurrent.ForkJoinPool.common.parallelism=1
34	+	*      -Djava.util.secureRandomSeed=true
35	+	*      JSR166TestCase
36	+	* @run junit/othervm/timeout=1000/policy=tck.policy
37	+	*      -Djsr166.testImplementationDetails=true
38	+	*      JSR166TestCase
39	+	*/
40	+
41		import static java.util.concurrent.TimeUnit.MILLISECONDS;
42		import static java.util.concurrent.TimeUnit.MINUTES;
43		import static java.util.concurrent.TimeUnit.NANOSECONDS;
#	Line 20 | Line 52 | import java.lang.management.ThreadMXBean
52		import java.lang.reflect.Constructor;
53		import java.lang.reflect.Method;
54		import java.lang.reflect.Modifier;
55	+	import java.nio.file.Files;
56	+	import java.nio.file.Paths;
57		import java.security.CodeSource;
58		import java.security.Permission;
59		import java.security.PermissionCollection;
#	Line 29 | Line 63 | import java.security.ProtectionDomain;
63		import java.security.SecurityPermission;
64		import java.util.ArrayList;
65		import java.util.Arrays;
66	+	import java.util.Collection;
67	+	import java.util.Collections;
68		import java.util.Date;
69		import java.util.Enumeration;
70		import java.util.Iterator;
#	Line 48 | Line 84 | import java.util.concurrent.RecursiveAct
84		import java.util.concurrent.RecursiveTask;
85		import java.util.concurrent.RejectedExecutionHandler;
86		import java.util.concurrent.Semaphore;
87	+	import java.util.concurrent.SynchronousQueue;
88		import java.util.concurrent.ThreadFactory;
89	+	import java.util.concurrent.ThreadLocalRandom;
90		import java.util.concurrent.ThreadPoolExecutor;
91		import java.util.concurrent.TimeoutException;
92	+	import java.util.concurrent.atomic.AtomicBoolean;
93		import java.util.concurrent.atomic.AtomicReference;
94	+	import java.util.regex.Matcher;
95		import java.util.regex.Pattern;
96
97		import junit.framework.AssertionFailedError;
#	Line 109 | Line 149 | import junit.framework.TestSuite;
149		* methods as there are exceptions the method can throw. Sometimes
150		* there are multiple tests per JSR166 method when the different
151		* "normal" behaviors differ significantly. And sometimes testcases
152	<	* cover multiple methods when they cannot be tested in
113	<	* isolation.
152	>	* cover multiple methods when they cannot be tested in isolation.
153		*
154		* <li>The documentation style for testcases is to provide as javadoc
155		* a simple sentence or two describing the property that the testcase
#	Line 173 | Line 212 | public class JSR166TestCase extends Test
212		private static final int suiteRuns =
213		Integer.getInteger("jsr166.suiteRuns", 1);
214
215	+	/**
216	+	* Returns the value of the system property, or NaN if not defined.
217	+	*/
218	+	private static float systemPropertyValue(String name) {
219	+	String floatString = System.getProperty(name);
220	+	if (floatString == null)
221	+	return Float.NaN;
222	+	try {
223	+	return Float.parseFloat(floatString);
224	+	} catch (NumberFormatException ex) {
225	+	throw new IllegalArgumentException(
226	+	String.format("Bad float value in system property %s=%s",
227	+	name, floatString));
228	+	}
229	+	}
230	+
231	+	/**
232	+	* The scaling factor to apply to standard delays used in tests.
233	+	* May be initialized from any of:
234	+	* - the "jsr166.delay.factor" system property
235	+	* - the "test.timeout.factor" system property (as used by jtreg)
236	+	*   See: http://openjdk.java.net/jtreg/tag-spec.html
237	+	* - hard-coded fuzz factor when using a known slowpoke VM
238	+	*/
239	+	private static final float delayFactor = delayFactor();
240	+
241	+	private static float delayFactor() {
242	+	float x;
243	+	if (!Float.isNaN(x = systemPropertyValue("jsr166.delay.factor")))
244	+	return x;
245	+	if (!Float.isNaN(x = systemPropertyValue("test.timeout.factor")))
246	+	return x;
247	+	String prop = System.getProperty("java.vm.version");
248	+	if (prop != null && prop.matches(".*debug.*"))
249	+	return 4.0f; // How much slower is fastdebug than product?!
250	+	return 1.0f;
251	+	}
252	+
253		public JSR166TestCase() { super(); }
254		public JSR166TestCase(String name) { super(name); }
255
#	Line 188 | Line 265 | public class JSR166TestCase extends Test
265		return (regex == null) ? null : Pattern.compile(regex);
266		}
267
268	+	// Instrumentation to debug very rare, but very annoying hung test runs.
269		static volatile TestCase currentTestCase;
270	+	// static volatile int currentRun = 0;
271		static {
272		Runnable checkForWedgedTest = new Runnable() { public void run() {
273	<	// avoid spurious reports with enormous runsPerTest
274	<	final int timeoutMinutes = Math.max(runsPerTest / 10, 1);
273	>	// Avoid spurious reports with enormous runsPerTest.
274	>	// A single test case run should never take more than 1 second.
275	>	// But let's cap it at the high end too ...
276	>	final int timeoutMinutes =
277	>	Math.min(15, Math.max(runsPerTest / 60, 1));
278		for (TestCase lastTestCase = currentTestCase;;) {
279		try { MINUTES.sleep(timeoutMinutes); }
280		catch (InterruptedException unexpected) { break; }
281		if (lastTestCase == currentTestCase) {
282	<	System.err.println
283	<	("Looks like we're stuck running test: "
284	<	+ lastTestCase);
282	>	System.err.printf(
283	>	"Looks like we're stuck running test: %s%n",
284	>	lastTestCase);
285	>	//                     System.err.printf(
286	>	//                         "Looks like we're stuck running test: %s (%d/%d)%n",
287	>	//                         lastTestCase, currentRun, runsPerTest);
288	>	//                     System.err.println("availableProcessors=" +
289	>	//                         Runtime.getRuntime().availableProcessors());
290	>	//                     System.err.printf("cpu model = %s%n", cpuModel());
291		dumpTestThreads();
292	+	// one stack dump is probably enough; more would be spam
293	+	break;
294		}
295		lastTestCase = currentTestCase;
296		}}};
#	Line 209 | Line 299 | public class JSR166TestCase extends Test
299		thread.start();
300		}
301
302	+	//     public static String cpuModel() {
303	+	//         try {
304	+	//             Matcher matcher = Pattern.compile("model name\\s*: (.*)")
305	+	//                 .matcher(new String(
306	+	//                      Files.readAllBytes(Paths.get("/proc/cpuinfo")), "UTF-8"));
307	+	//             matcher.find();
308	+	//             return matcher.group(1);
309	+	//         } catch (Exception ex) { return null; }
310	+	//     }
311	+
312		public void runBare() throws Throwable {
313		currentTestCase = this;
314		if (methodFilter == null
#	Line 218 | Line 318 | public class JSR166TestCase extends Test
318
319		protected void runTest() throws Throwable {
320		for (int i = 0; i < runsPerTest; i++) {
321	+	// currentRun = i;
322		if (profileTests)
323		runTestProfiled();
324		else
#	Line 246 | Line 347 | public class JSR166TestCase extends Test
347		main(suite(), args);
348		}
349
350	+	static class PithyResultPrinter extends junit.textui.ResultPrinter {
351	+	PithyResultPrinter(java.io.PrintStream writer) { super(writer); }
352	+	long runTime;
353	+	public void startTest(Test test) {}
354	+	protected void printHeader(long runTime) {
355	+	this.runTime = runTime; // defer printing for later
356	+	}
357	+	protected void printFooter(TestResult result) {
358	+	if (result.wasSuccessful()) {
359	+	getWriter().println("OK (" + result.runCount() + " tests)"
360	+	+ "  Time: " + elapsedTimeAsString(runTime));
361	+	} else {
362	+	getWriter().println("Time: " + elapsedTimeAsString(runTime));
363	+	super.printFooter(result);
364	+	}
365	+	}
366	+	}
367	+
368	+	/**
369	+	* Returns a TestRunner that doesn't bother with unnecessary
370	+	* fluff, like printing a "." for each test case.
371	+	*/
372	+	static junit.textui.TestRunner newPithyTestRunner() {
373	+	junit.textui.TestRunner runner = new junit.textui.TestRunner();
374	+	runner.setPrinter(new PithyResultPrinter(System.out));
375	+	return runner;
376	+	}
377	+
378		/**
379		* Runs all unit tests in the given test suite.
380		* Actual behavior influenced by jsr166.* system properties.
#	Line 257 | Line 386 | public class JSR166TestCase extends Test
386		System.setSecurityManager(new SecurityManager());
387		}
388		for (int i = 0; i < suiteRuns; i++) {
389	<	TestResult result = junit.textui.TestRunner.run(suite);
389	>	TestResult result = newPithyTestRunner().doRun(suite);
390		if (!result.wasSuccessful())
391		System.exit(1);
392		System.gc();
#	Line 341 | Line 470 | public class JSR166TestCase extends Test
470		AbstractQueuedLongSynchronizerTest.suite(),
471		ArrayBlockingQueueTest.suite(),
472		ArrayDequeTest.suite(),
473	+	ArrayListTest.suite(),
474		AtomicBooleanTest.suite(),
475		AtomicIntegerArrayTest.suite(),
476		AtomicIntegerFieldUpdaterTest.suite(),
#	Line 363 | Line 493 | public class JSR166TestCase extends Test
493		CopyOnWriteArrayListTest.suite(),
494		CopyOnWriteArraySetTest.suite(),
495		CountDownLatchTest.suite(),
496	+	CountedCompleterTest.suite(),
497		CyclicBarrierTest.suite(),
498		DelayQueueTest.suite(),
499		EntryTest.suite(),
#	Line 391 | Line 522 | public class JSR166TestCase extends Test
522		TreeMapTest.suite(),
523		TreeSetTest.suite(),
524		TreeSubMapTest.suite(),
525	<	TreeSubSetTest.suite());
525	>	TreeSubSetTest.suite(),
526	>	VectorTest.suite());
527
528		// Java8+ test classes
529		if (atLeastJava8()) {
530		String[] java8TestClassNames = {
531	+	"ArrayDeque8Test",
532		"Atomic8Test",
533		"CompletableFutureTest",
534		"ConcurrentHashMap8Test",
535	<	"CountedCompleterTest",
535	>	"CountedCompleter8Test",
536		"DoubleAccumulatorTest",
537		"DoubleAdderTest",
538		"ForkJoinPool8Test",
539		"ForkJoinTask8Test",
540	+	"LinkedBlockingDeque8Test",
541	+	"LinkedBlockingQueue8Test",
542		"LongAccumulatorTest",
543		"LongAdderTest",
544		"SplittableRandomTest",
545		"StampedLockTest",
546		"SubmissionPublisherTest",
547		"ThreadLocalRandom8Test",
548	+	"TimeUnit8Test",
549		};
550		addNamedTestClasses(suite, java8TestClassNames);
551		}
#	Line 417 | Line 553 | public class JSR166TestCase extends Test
553		// Java9+ test classes
554		if (atLeastJava9()) {
555		String[] java9TestClassNames = {
556	<	// Currently empty, but expecting varhandle tests
556	>	"AtomicBoolean9Test",
557	>	"AtomicInteger9Test",
558	>	"AtomicIntegerArray9Test",
559	>	"AtomicLong9Test",
560	>	"AtomicLongArray9Test",
561	>	"AtomicReference9Test",
562	>	"AtomicReferenceArray9Test",
563	>	"ExecutorCompletionService9Test",
564	>	"ForkJoinPool9Test",
565		};
566		addNamedTestClasses(suite, java9TestClassNames);
567		}
#	Line 428 | Line 572 | public class JSR166TestCase extends Test
572		/** Returns list of junit-style test method names in given class. */
573		public static ArrayList<String> testMethodNames(Class<?> testClass) {
574		Method[] methods = testClass.getDeclaredMethods();
575	<	ArrayList<String> names = new ArrayList<String>(methods.length);
575	>	ArrayList<String> names = new ArrayList<>(methods.length);
576		for (Method method : methods) {
577		if (method.getName().startsWith("test")
578		&& Modifier.isPublic(method.getModifiers())
#	Line 494 | Line 638 | public class JSR166TestCase extends Test
638		public static long LONG_DELAY_MS;
639
640		/**
641	<	* Returns the shortest timed delay. This could
642	<	* be reimplemented to use for example a Property.
641	>	* Returns the shortest timed delay. This can be scaled up for
642	>	* slow machines using the jsr166.delay.factor system property,
643	>	* or via jtreg's -timeoutFactor: flag.
644	>	* http://openjdk.java.net/jtreg/command-help.html
645		*/
646		protected long getShortDelay() {
647	<	return 50;
647	>	return (long) (50 * delayFactor);
648		}
649
650		/**
#	Line 532 | Line 678 | public class JSR166TestCase extends Test
678		* The first exception encountered if any threadAssertXXX method fails.
679		*/
680		private final AtomicReference<Throwable> threadFailure
681	<	= new AtomicReference<Throwable>(null);
681	>	= new AtomicReference<>(null);
682
683		/**
684		* Records an exception so that it can be rethrown later in the test
#	Line 774 | Line 920 | public class JSR166TestCase extends Test
920		public void close() { joinPool(pool); }
921		}
922
923	+	/**
924	+	* An extension of PoolCleaner that has an action to release the pool.
925	+	*/
926	+	class PoolCleanerWithReleaser extends PoolCleaner {
927	+	private final Runnable releaser;
928	+	public PoolCleanerWithReleaser(ExecutorService pool, Runnable releaser) {
929	+	super(pool);
930	+	this.releaser = releaser;
931	+	}
932	+	public void close() {
933	+	try {
934	+	releaser.run();
935	+	} finally {
936	+	super.close();
937	+	}
938	+	}
939	+	}
940	+
941		PoolCleaner cleaner(ExecutorService pool) {
942		return new PoolCleaner(pool);
943		}
944
945	+	PoolCleaner cleaner(ExecutorService pool, Runnable releaser) {
946	+	return new PoolCleanerWithReleaser(pool, releaser);
947	+	}
948	+
949	+	PoolCleaner cleaner(ExecutorService pool, CountDownLatch latch) {
950	+	return new PoolCleanerWithReleaser(pool, releaser(latch));
951	+	}
952	+
953	+	Runnable releaser(final CountDownLatch latch) {
954	+	return new Runnable() { public void run() {
955	+	do { latch.countDown(); }
956	+	while (latch.getCount() > 0);
957	+	}};
958	+	}
959	+
960	+	PoolCleaner cleaner(ExecutorService pool, AtomicBoolean flag) {
961	+	return new PoolCleanerWithReleaser(pool, releaser(flag));
962	+	}
963	+
964	+	Runnable releaser(final AtomicBoolean flag) {
965	+	return new Runnable() { public void run() { flag.set(true); }};
966	+	}
967	+
968		/**
969		* Waits out termination of a thread pool or fails doing so.
970		*/
#	Line 791 | Line 978 | public class JSR166TestCase extends Test
978		} finally {
979		// last resort, for the benefit of subsequent tests
980		pool.shutdownNow();
981	<	pool.awaitTermination(SMALL_DELAY_MS, MILLISECONDS);
981	>	pool.awaitTermination(MEDIUM_DELAY_MS, MILLISECONDS);
982		}
983		}
984		} catch (SecurityException ok) {
#	Line 801 | Line 988 | public class JSR166TestCase extends Test
988		}
989		}
990
991	<	/** Like Runnable, but with the freedom to throw anything */
991	>	/**
992	>	* Like Runnable, but with the freedom to throw anything.
993	>	* junit folks had the same idea:
994	>	* http://junit.org/junit5/docs/snapshot/api/org/junit/gen5/api/Executable.html
995	>	*/
996		interface Action { public void run() throws Throwable; }
997
998		/**
#	Line 832 | Line 1023 | public class JSR166TestCase extends Test
1023		* Uninteresting threads are filtered out.
1024		*/
1025		static void dumpTestThreads() {
1026	+	SecurityManager sm = System.getSecurityManager();
1027	+	if (sm != null) {
1028	+	try {
1029	+	System.setSecurityManager(null);
1030	+	} catch (SecurityException giveUp) {
1031	+	return;
1032	+	}
1033	+	}
1034	+
1035		ThreadMXBean threadMXBean = ManagementFactory.getThreadMXBean();
1036		System.err.println("------ stacktrace dump start ------");
1037		for (ThreadInfo info : threadMXBean.dumpAllThreads(true, true)) {
1038	<	String name = info.getThreadName();
1038	>	final String name = info.getThreadName();
1039	>	String lockName;
1040		if ("Signal Dispatcher".equals(name))
1041		continue;
1042		if ("Reference Handler".equals(name)
1043	<	&& info.getLockName().startsWith("java.lang.ref.Reference$Lock"))
1043	>	&& (lockName = info.getLockName()) != null
1044	>	&& lockName.startsWith("java.lang.ref.Reference$Lock"))
1045		continue;
1046		if ("Finalizer".equals(name)
1047	<	&& info.getLockName().startsWith("java.lang.ref.ReferenceQueue$Lock"))
1047	>	&& (lockName = info.getLockName()) != null
1048	>	&& lockName.startsWith("java.lang.ref.ReferenceQueue$Lock"))
1049		continue;
1050		if ("checkForWedgedTest".equals(name))
1051		continue;
1052		System.err.print(info);
1053		}
1054		System.err.println("------ stacktrace dump end ------");
1055	+
1056	+	if (sm != null) System.setSecurityManager(sm);
1057		}
1058
1059		/**
#	Line 1035 | Line 1240 | public class JSR166TestCase extends Test
1240		}
1241		public void refresh() {}
1242		public String toString() {
1243	<	List<Permission> ps = new ArrayList<Permission>();
1243	>	List<Permission> ps = new ArrayList<>();
1244		for (Enumeration<Permission> e = perms.elements(); e.hasMoreElements();)
1245		ps.add(e.nextElement());
1246		return "AdjustablePolicy with permissions " + ps;
#	Line 1065 | Line 1270 | public class JSR166TestCase extends Test
1270		* Sleeps until the given time has elapsed.
1271		* Throws AssertionFailedError if interrupted.
1272		*/
1273	<	void sleep(long millis) {
1273	>	static void sleep(long millis) {
1274		try {
1275		delay(millis);
1276		} catch (InterruptedException fail) {
#	Line 1081 | Line 1286 | public class JSR166TestCase extends Test
1286		* thread to enter a wait state: BLOCKED, WAITING, or TIMED_WAITING.
1287		*/
1288		void waitForThreadToEnterWaitState(Thread thread, long timeoutMillis) {
1289	<	long startTime = System.nanoTime();
1289	>	long startTime = 0L;
1290		for (;;) {
1291		Thread.State s = thread.getState();
1292		if (s == Thread.State.BLOCKED ||
#	Line 1090 | Line 1295 | public class JSR166TestCase extends Test
1295		return;
1296		else if (s == Thread.State.TERMINATED)
1297		fail("Unexpected thread termination");
1298	+	else if (startTime == 0L)
1299	+	startTime = System.nanoTime();
1300		else if (millisElapsedSince(startTime) > timeoutMillis) {
1301		threadAssertTrue(thread.isAlive());
1302		return;
#	Line 1168 | Line 1375 | public class JSR166TestCase extends Test
1375		} finally {
1376		if (t.getState() != Thread.State.TERMINATED) {
1377		t.interrupt();
1378	<	fail("Test timed out");
1378	>	threadFail("timed out waiting for thread to terminate");
1379		}
1380		}
1381		}
#	Line 1334 | Line 1541 | public class JSR166TestCase extends Test
1541		return new LatchAwaiter(latch);
1542		}
1543
1544	<	public void await(CountDownLatch latch) {
1544	>	public void await(CountDownLatch latch, long timeoutMillis) {
1545		try {
1546	<	assertTrue(latch.await(LONG_DELAY_MS, MILLISECONDS));
1546	>	if (!latch.await(timeoutMillis, MILLISECONDS))
1547	>	fail("timed out waiting for CountDownLatch for "
1548	>	+ (timeoutMillis/1000) + " sec");
1549		} catch (Throwable fail) {
1550		threadUnexpectedException(fail);
1551		}
1552		}
1553
1554	+	public void await(CountDownLatch latch) {
1555	+	await(latch, LONG_DELAY_MS);
1556	+	}
1557	+
1558		public void await(Semaphore semaphore) {
1559		try {
1560	<	assertTrue(semaphore.tryAcquire(LONG_DELAY_MS, MILLISECONDS));
1560	>	if (!semaphore.tryAcquire(LONG_DELAY_MS, MILLISECONDS))
1561	>	fail("timed out waiting for Semaphore for "
1562	>	+ (LONG_DELAY_MS/1000) + " sec");
1563		} catch (Throwable fail) {
1564		threadUnexpectedException(fail);
1565		}
#	Line 1574 | Line 1789 | public class JSR166TestCase extends Test
1789		* A CyclicBarrier that uses timed await and fails with
1790		* AssertionFailedErrors instead of throwing checked exceptions.
1791		*/
1792	<	public class CheckedBarrier extends CyclicBarrier {
1792	>	public static class CheckedBarrier extends CyclicBarrier {
1793		public CheckedBarrier(int parties) { super(parties); }
1794
1795		public int await() {
#	Line 1638 | Line 1853 | public class JSR166TestCase extends Test
1853		}
1854		}
1855
1856	+	void assertImmutable(final Object o) {
1857	+	if (o instanceof Collection) {
1858	+	assertThrows(
1859	+	UnsupportedOperationException.class,
1860	+	new Runnable() { public void run() {
1861	+	((Collection) o).add(null);}});
1862	+	}
1863	+	}
1864	+
1865		@SuppressWarnings("unchecked")
1866		<T> T serialClone(T o) {
1867		try {
1868		ObjectInputStream ois = new ObjectInputStream
1869		(new ByteArrayInputStream(serialBytes(o)));
1870		T clone = (T) ois.readObject();
1871	+	if (o == clone) assertImmutable(o);
1872		assertSame(o.getClass(), clone.getClass());
1873		return clone;
1874		} catch (Throwable fail) {
#	Line 1652 | Line 1877 | public class JSR166TestCase extends Test
1877		}
1878		}
1879
1880	+	/**
1881	+	* A version of serialClone that leaves error handling (for
1882	+	* e.g. NotSerializableException) up to the caller.
1883	+	*/
1884	+	@SuppressWarnings("unchecked")
1885	+	<T> T serialClonePossiblyFailing(T o)
1886	+	throws ReflectiveOperationException, java.io.IOException {
1887	+	ByteArrayOutputStream bos = new ByteArrayOutputStream();
1888	+	ObjectOutputStream oos = new ObjectOutputStream(bos);
1889	+	oos.writeObject(o);
1890	+	oos.flush();
1891	+	oos.close();
1892	+	ObjectInputStream ois = new ObjectInputStream
1893	+	(new ByteArrayInputStream(bos.toByteArray()));
1894	+	T clone = (T) ois.readObject();
1895	+	if (o == clone) assertImmutable(o);
1896	+	assertSame(o.getClass(), clone.getClass());
1897	+	return clone;
1898	+	}
1899	+
1900	+	/**
1901	+	* If o implements Cloneable and has a public clone method,
1902	+	* returns a clone of o, else null.
1903	+	*/
1904	+	@SuppressWarnings("unchecked")
1905	+	<T> T cloneableClone(T o) {
1906	+	if (!(o instanceof Cloneable)) return null;
1907	+	final T clone;
1908	+	try {
1909	+	clone = (T) o.getClass().getMethod("clone").invoke(o);
1910	+	} catch (NoSuchMethodException ok) {
1911	+	return null;
1912	+	} catch (ReflectiveOperationException unexpected) {
1913	+	throw new Error(unexpected);
1914	+	}
1915	+	assertNotSame(o, clone); // not 100% guaranteed by spec
1916	+	assertSame(o.getClass(), clone.getClass());
1917	+	return clone;
1918	+	}
1919	+
1920		public void assertThrows(Class<? extends Throwable> expectedExceptionClass,
1921		Runnable... throwingActions) {
1922		for (Runnable throwingAction : throwingActions) {
#	Line 1680 | Line 1945 | public class JSR166TestCase extends Test
1945		} catch (NoSuchElementException success) {}
1946		assertFalse(it.hasNext());
1947		}
1948	+
1949	+	public <T> Callable<T> callableThrowing(final Exception ex) {
1950	+	return new Callable<T>() { public T call() throws Exception { throw ex; }};
1951	+	}
1952	+
1953	+	public Runnable runnableThrowing(final RuntimeException ex) {
1954	+	return new Runnable() { public void run() { throw ex; }};
1955	+	}
1956	+
1957	+	/** A reusable thread pool to be shared by tests. */
1958	+	static final ExecutorService cachedThreadPool =
1959	+	new ThreadPoolExecutor(0, Integer.MAX_VALUE,
1960	+	1000L, MILLISECONDS,
1961	+	new SynchronousQueue<Runnable>());
1962	+
1963	+	static <T> void shuffle(T[] array) {
1964	+	Collections.shuffle(Arrays.asList(array), ThreadLocalRandom.current());
1965	+	}
1966		}

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