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

Comparing jsr166/src/test/tck/JSR166TestCase.java (file contents):
Revision 1.6 by dl, Sun Oct 5 23:00:40 2003 UTC vs.
Revision 1.255 by jsr166, Sun Jul 28 18:09:25 2019 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 and Martin Buchholz with assistance from
3	>	* members of JCP JSR-166 Expert Group and released to the public
4	>	* domain, as explained at
5	>	* http://creativecommons.org/publicdomain/zero/1.0/
6	>	* Other contributors include Andrew Wright, Jeffrey Hayes,
7	>	* Pat Fisher, Mike Judd.
8		*/
9
10	<	import junit.framework.*;
11	<	import java.util.*;
12	<	import java.util.concurrent.*;
13	<	import java.io.*;
10	>	/*
11	>	* @test
12	>	* @summary JSR-166 tck tests, in a number of variations.
13	>	*          The first is the conformance testing variant,
14	>	*          while others also test implementation details.
15	>	* @build *
16	>	* @modules java.management
17	>	* @run junit/othervm/timeout=1000 JSR166TestCase
18	>	* @run junit/othervm/timeout=1000
19	>	*      --add-opens java.base/java.util.concurrent=ALL-UNNAMED
20	>	*      --add-opens java.base/java.lang=ALL-UNNAMED
21	>	*      -Djsr166.testImplementationDetails=true
22	>	*      JSR166TestCase
23	>	* @run junit/othervm/timeout=1000
24	>	*      --add-opens java.base/java.util.concurrent=ALL-UNNAMED
25	>	*      --add-opens java.base/java.lang=ALL-UNNAMED
26	>	*      -Djsr166.testImplementationDetails=true
27	>	*      -Djava.util.concurrent.ForkJoinPool.common.parallelism=0
28	>	*      JSR166TestCase
29	>	* @run junit/othervm/timeout=1000
30	>	*      --add-opens java.base/java.util.concurrent=ALL-UNNAMED
31	>	*      --add-opens java.base/java.lang=ALL-UNNAMED
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	>	*      --add-opens java.base/java.util.concurrent=ALL-UNNAMED
38	>	*      --add-opens java.base/java.lang=ALL-UNNAMED
39	>	*      -Djsr166.testImplementationDetails=true
40	>	*      JSR166TestCase
41	>	*/
42
43	+	import static java.util.concurrent.TimeUnit.MILLISECONDS;
44	+	import static java.util.concurrent.TimeUnit.MINUTES;
45	+	import static java.util.concurrent.TimeUnit.NANOSECONDS;
46	+
47	+	import java.io.ByteArrayInputStream;
48	+	import java.io.ByteArrayOutputStream;
49	+	import java.io.ObjectInputStream;
50	+	import java.io.ObjectOutputStream;
51	+	import java.lang.management.ManagementFactory;
52	+	import java.lang.management.ThreadInfo;
53	+	import java.lang.management.ThreadMXBean;
54	+	import java.lang.reflect.Constructor;
55	+	import java.lang.reflect.Method;
56	+	import java.lang.reflect.Modifier;
57	+	import java.security.CodeSource;
58	+	import java.security.Permission;
59	+	import java.security.PermissionCollection;
60	+	import java.security.Permissions;
61	+	import java.security.Policy;
62	+	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.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	+
105	+	import junit.framework.Test;
106	+	import junit.framework.TestCase;
107	+	import junit.framework.TestResult;
108	+	import junit.framework.TestSuite;
109
110		/**
111		* Base class for JSR166 Junit TCK tests.  Defines some constants,
112		* utility methods and classes, as well as a simple framework for
113		* helping to make sure that assertions failing in generated threads
114		* cause the associated test that generated them to itself fail (which
115	<	* JUnit doe not otherwise arrange).  The rules for creating such
115	>	* JUnit does not otherwise arrange).  The rules for creating such
116		* tests are:
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	<	* <tt>fail</tt>, <tt>assertTrue</tt>, 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.</li>
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 <tt>super.setUp</tt> and <tt>super.tearDown</tt> within
136	>	* <li>If you override {@link #setUp} or {@link #tearDown}, make sure
137	>	* to invoke {@code super.setUp} and {@code super.tearDown} within
138		* them. These methods are used to clear and check for thread
139	<	* assertion failures.</li>
139	>	* assertion failures.
140		*
141	<	* <li>All delays and timeouts must use one of the constants <tt>
142	<	* SHORT_DELAY_MS</tt>, <tt> SMALL_DELAY_MS</tt>, <tt> MEDIUM_DELAY_MS</tt>,
143	<	* <tt> LONG_DELAY_MS</tt>. The idea here is that a SHORT is always
141	>	* <li>All delays and timeouts must use one of the constants {@code
142	>	* SHORT_DELAY_MS}, {@code SMALL_DELAY_MS}, {@code MEDIUM_DELAY_MS},
143	>	* {@code LONG_DELAY_MS}. The idea here is that a SHORT is always
144		* discriminable from zero time, and always allows enough time for the
145		* small amounts of computation (creating a thread, calling a few
146		* methods, etc) needed to reach a timeout point. Similarly, a SMALL
147		* is always discriminable as larger than SHORT and smaller than
148		* MEDIUM.  And so on. These constants are set to conservative values,
149		* but even so, if there is ever any doubt, they can all be increased
150	<	* in one spot to rerun tests on slower platforms</li>
150	>	* in one spot to rerun tests on slower platforms.
151		*
152	<	* <li> All threads generated must be joined inside each test case
153	<	* method (or <tt>fail</tt> to do so) before returning from the
154	<	* method. The <tt> joinPool</tt> method can be used to do this when
155	<	* using Executors.</li>
152	>	* <li>All threads generated must be joined inside each test case
153	>	* method (or {@code fail} to do so) before returning from the
154	>	* method. The {@code joinPool} method can be used to do this when
155	>	* using Executors.
156		*
157		* </ol>
158		*
159	<	* <p> <b>Other notes</b>
159	>	* <p><b>Other notes</b>
160		* <ul>
161		*
162	<	* <li> Usually, there is one testcase method per JSR166 method
162	>	* <li>Usually, there is one testcase method per JSR166 method
163		* covering "normal" operation, and then as many exception-testing
164		* methods as there are exceptions the method can throw. Sometimes
165		* there are multiple tests per JSR166 method when the different
166		* "normal" behaviors differ significantly. And sometimes testcases
167	<	* cover multiple methods when they cannot be tested in
168	<	* isolation.</li>
169	<	*
66	<	* <li> The documentation style for testcases is to provide as javadoc
167	>	* cover multiple methods when they cannot be tested in isolation.
168	>	*
169	>	* <li>The documentation style for testcases is to provide as javadoc
170		* a simple sentence or two describing the property that the testcase
171		* method purports to test. The javadocs do not say anything about how
172	<	* the property is tested. To find out, read the code.</li>
172	>	* the property is tested. To find out, read the code.
173		*
174	<	* <li> These tests are "conformance tests", and do not attempt to
174	>	* <li>These tests are "conformance tests", and do not attempt to
175		* test throughput, latency, scalability or other performance factors
176		* (see the separate "jtreg" tests for a set intended to check these
177		* for the most central aspects of functionality.) So, most tests use
178		* the smallest sensible numbers of threads, collection sizes, etc
179	<	* needed to check basic conformance.</li>
179	>	* needed to check basic conformance.
180		*
181		* <li>The test classes currently do not declare inclusion in
182		* any particular package to simplify things for people integrating
183	<	* them in TCK test suites.</li>
183	>	* them in TCK test suites.
184		*
185	<	* <li> As a convenience, the <tt>main</tt> of this class (JSR166TestCase)
186	<	* runs all JSR166 unit tests.</li>
185	>	* <li>As a convenience, the {@code main} of this class (JSR166TestCase)
186	>	* runs all JSR166 unit tests.
187		*
188		* </ul>
189		*/
190		public class JSR166TestCase extends TestCase {
191	+	private static final boolean useSecurityManager =
192	+	Boolean.getBoolean("jsr166.useSecurityManager");
193	+
194	+	protected static final boolean expensiveTests =
195	+	Boolean.getBoolean("jsr166.expensiveTests");
196	+
197	+	/**
198	+	* If true, also run tests that are not part of the official tck
199	+	* because they test unspecified implementation details.
200	+	*/
201	+	protected static final boolean testImplementationDetails =
202	+	Boolean.getBoolean("jsr166.testImplementationDetails");
203	+
204	+	/**
205	+	* If true, report on stdout all "slow" tests, that is, ones that
206	+	* take more than profileThreshold milliseconds to execute.
207	+	*/
208	+	private static final boolean profileTests =
209	+	Boolean.getBoolean("jsr166.profileTests");
210	+
211	+	/**
212	+	* The number of milliseconds that tests are permitted for
213	+	* execution without being reported, when profileTests is set.
214	+	*/
215	+	private static final long profileThreshold =
216	+	Long.getLong("jsr166.profileThreshold", 100);
217	+
218	+	/**
219	+	* The number of repetitions per test (for tickling rare bugs).
220	+	*/
221	+	private static final int runsPerTest =
222	+	Integer.getInteger("jsr166.runsPerTest", 1);
223	+
224	+	/**
225	+	* The number of repetitions of the test suite (for finding leaks?).
226	+	*/
227	+	private static final int suiteRuns =
228	+	Integer.getInteger("jsr166.suiteRuns", 1);
229	+
230	+	/**
231	+	* Returns the value of the system property, or NaN if not defined.
232	+	*/
233	+	private static float systemPropertyValue(String name) {
234	+	String floatString = System.getProperty(name);
235	+	if (floatString == null)
236	+	return Float.NaN;
237	+	try {
238	+	return Float.parseFloat(floatString);
239	+	} catch (NumberFormatException ex) {
240	+	throw new IllegalArgumentException(
241	+	String.format("Bad float value in system property %s=%s",
242	+	name, floatString));
243	+	}
244	+	}
245	+
246	+	/**
247	+	* The scaling factor to apply to standard delays used in tests.
248	+	* May be initialized from any of:
249	+	* - the "jsr166.delay.factor" system property
250	+	* - the "test.timeout.factor" system property (as used by jtreg)
251	+	*   See: http://openjdk.java.net/jtreg/tag-spec.html
252	+	* - hard-coded fuzz factor when using a known slowpoke VM
253	+	*/
254	+	private static final float delayFactor = delayFactor();
255	+
256	+	private static float delayFactor() {
257	+	float x;
258	+	if (!Float.isNaN(x = systemPropertyValue("jsr166.delay.factor")))
259	+	return x;
260	+	if (!Float.isNaN(x = systemPropertyValue("test.timeout.factor")))
261	+	return x;
262	+	String prop = System.getProperty("java.vm.version");
263	+	if (prop != null && prop.matches(".*debug.*"))
264	+	return 4.0f; // How much slower is fastdebug than product?!
265	+	return 1.0f;
266	+	}
267	+
268	+	public JSR166TestCase() { super(); }
269	+	public JSR166TestCase(String name) { super(name); }
270	+
271	+	/**
272	+	* A filter for tests to run, matching strings of the form
273	+	* methodName(className), e.g. "testInvokeAll5(ForkJoinPoolTest)"
274	+	* Usefully combined with jsr166.runsPerTest.
275	+	*/
276	+	private static final Pattern methodFilter = methodFilter();
277	+
278	+	private static Pattern methodFilter() {
279	+	String regex = System.getProperty("jsr166.methodFilter");
280	+	return (regex == null) ? null : Pattern.compile(regex);
281	+	}
282	+
283	+	// Instrumentation to debug very rare, but very annoying hung test runs.
284	+	static volatile TestCase currentTestCase;
285	+	// static volatile int currentRun = 0;
286	+	static {
287	+	Runnable checkForWedgedTest = new Runnable() { public void run() {
288	+	// Avoid spurious reports with enormous runsPerTest.
289	+	// A single test case run should never take more than 1 second.
290	+	// But let's cap it at the high end too ...
291	+	final int timeoutMinutesMin = Math.max(runsPerTest / 60, 1)
292	+	* Math.max((int) delayFactor, 1);
293	+	final int timeoutMinutes = Math.min(15, timeoutMinutesMin);
294	+	for (TestCase lastTestCase = currentTestCase;;) {
295	+	try { MINUTES.sleep(timeoutMinutes); }
296	+	catch (InterruptedException unexpected) { break; }
297	+	if (lastTestCase == currentTestCase) {
298	+	System.err.printf(
299	+	"Looks like we're stuck running test: %s%n",
300	+	lastTestCase);
301	+	//                     System.err.printf(
302	+	//                         "Looks like we're stuck running test: %s (%d/%d)%n",
303	+	//                         lastTestCase, currentRun, runsPerTest);
304	+	//                     System.err.println("availableProcessors=" +
305	+	//                         Runtime.getRuntime().availableProcessors());
306	+	//                     System.err.printf("cpu model = %s%n", cpuModel());
307	+	dumpTestThreads();
308	+	// one stack dump is probably enough; more would be spam
309	+	break;
310	+	}
311	+	lastTestCase = currentTestCase;
312	+	}}};
313	+	Thread thread = new Thread(checkForWedgedTest, "checkForWedgedTest");
314	+	thread.setDaemon(true);
315	+	thread.start();
316	+	}
317	+
318	+	//     public static String cpuModel() {
319	+	//         try {
320	+	//             java.util.regex.Matcher matcher
321	+	//               = Pattern.compile("model name\\s*: (.*)")
322	+	//                 .matcher(new String(
323	+	//                     java.nio.file.Files.readAllBytes(
324	+	//                         java.nio.file.Paths.get("/proc/cpuinfo")), "UTF-8"));
325	+	//             matcher.find();
326	+	//             return matcher.group(1);
327	+	//         } catch (Exception ex) { return null; }
328	+	//     }
329	+
330	+	public void runBare() throws Throwable {
331	+	currentTestCase = this;
332	+	if (methodFilter == null
333	+	|| methodFilter.matcher(toString()).find())
334	+	super.runBare();
335	+	}
336	+
337	+	protected void runTest() throws Throwable {
338	+	for (int i = 0; i < runsPerTest; i++) {
339	+	// currentRun = i;
340	+	if (profileTests)
341	+	runTestProfiled();
342	+	else
343	+	super.runTest();
344	+	}
345	+	}
346	+
347	+	protected void runTestProfiled() throws Throwable {
348	+	for (int i = 0; i < 2; i++) {
349	+	long startTime = System.nanoTime();
350	+	super.runTest();
351	+	long elapsedMillis = millisElapsedSince(startTime);
352	+	if (elapsedMillis < profileThreshold)
353	+	break;
354	+	// Never report first run of any test; treat it as a
355	+	// warmup run, notably to trigger all needed classloading,
356	+	if (i > 0)
357	+	System.out.printf("%n%s: %d%n", toString(), elapsedMillis);
358	+	}
359	+	}
360	+
361		/**
362	<	* Runs all JSR166 unit tests using junit.textui.TestRunner
363	<	*/
364	<	public static void main (String[] args) {
365	<	junit.textui.TestRunner.run (suite());
362	>	* Runs all JSR166 unit tests using junit.textui.TestRunner.
363	>	*/
364	>	public static void main(String[] args) {
365	>	main(suite(), args);
366	>	}
367	>
368	>	static class PithyResultPrinter extends junit.textui.ResultPrinter {
369	>	PithyResultPrinter(java.io.PrintStream writer) { super(writer); }
370	>	long runTime;
371	>	public void startTest(Test test) {}
372	>	protected void printHeader(long runTime) {
373	>	this.runTime = runTime; // defer printing for later
374	>	}
375	>	protected void printFooter(TestResult result) {
376	>	if (result.wasSuccessful()) {
377	>	getWriter().println("OK (" + result.runCount() + " tests)"
378	>	+ "  Time: " + elapsedTimeAsString(runTime));
379	>	} else {
380	>	getWriter().println("Time: " + elapsedTimeAsString(runTime));
381	>	super.printFooter(result);
382	>	}
383	>	}
384		}
385
386		/**
387	<	* Collects all JSR166 unit tests as one suite
388	<	*/
389	<	public static Test suite ( ) {
390	<	TestSuite suite = new TestSuite("JSR166 Unit Tests");
391	<
392	<	suite.addTest(new TestSuite(ArrayBlockingQueueTest.class));
393	<	suite.addTest(new TestSuite(AtomicBooleanTest.class));
394	<	suite.addTest(new TestSuite(AtomicIntegerArrayTest.class));
395	<	suite.addTest(new TestSuite(AtomicIntegerFieldUpdaterTest.class));
396	<	suite.addTest(new TestSuite(AtomicIntegerTest.class));
397	<	suite.addTest(new TestSuite(AtomicLongArrayTest.class));
398	<	suite.addTest(new TestSuite(AtomicLongFieldUpdaterTest.class));
399	<	suite.addTest(new TestSuite(AtomicLongTest.class));
400	<	suite.addTest(new TestSuite(AtomicMarkableReferenceTest.class));
401	<	suite.addTest(new TestSuite(AtomicReferenceArrayTest.class));
402	<	suite.addTest(new TestSuite(AtomicReferenceFieldUpdaterTest.class));
403	<	suite.addTest(new TestSuite(AtomicReferenceTest.class));
404	<	suite.addTest(new TestSuite(AtomicStampedReferenceTest.class));
405	<	suite.addTest(new TestSuite(CancellableTaskTest.class));
406	<	suite.addTest(new TestSuite(ConcurrentHashMapTest.class));
407	<	suite.addTest(new TestSuite(ConcurrentLinkedQueueTest.class));
408	<	suite.addTest(new TestSuite(CopyOnWriteArrayListTest.class));
409	<	suite.addTest(new TestSuite(CopyOnWriteArraySetTest.class));
410	<	suite.addTest(new TestSuite(CountDownLatchTest.class));
411	<	suite.addTest(new TestSuite(CyclicBarrierTest.class));
412	<	suite.addTest(new TestSuite(DelayQueueTest.class));
413	<	suite.addTest(new TestSuite(ExchangerTest.class));
414	<	suite.addTest(new TestSuite(ExecutorsTest.class));
415	<	suite.addTest(new TestSuite(FairSemaphoreTest.class));
416	<	suite.addTest(new TestSuite(FutureTaskTest.class));
417	<	suite.addTest(new TestSuite(LinkedBlockingQueueTest.class));
418	<	suite.addTest(new TestSuite(LinkedListTest.class));
419	<	suite.addTest(new TestSuite(LockSupportTest.class));
420	<	suite.addTest(new TestSuite(PriorityBlockingQueueTest.class));
421	<	suite.addTest(new TestSuite(PriorityQueueTest.class));
422	<	suite.addTest(new TestSuite(ReentrantLockTest.class));
423	<	suite.addTest(new TestSuite(ReentrantReadWriteLockTest.class));
424	<	suite.addTest(new TestSuite(ScheduledExecutorTest.class));
134	<	suite.addTest(new TestSuite(SemaphoreTest.class));
135	<	suite.addTest(new TestSuite(SynchronousQueueTest.class));
136	<	suite.addTest(new TestSuite(SystemTest.class));
137	<	suite.addTest(new TestSuite(ThreadLocalTest.class));
138	<	suite.addTest(new TestSuite(ThreadPoolExecutorTest.class));
139	<	suite.addTest(new TestSuite(ThreadTest.class));
140	<	suite.addTest(new TestSuite(TimeUnitTest.class));
141	<
387	>	* Returns a TestRunner that doesn't bother with unnecessary
388	>	* fluff, like printing a "." for each test case.
389	>	*/
390	>	static junit.textui.TestRunner newPithyTestRunner() {
391	>	junit.textui.TestRunner runner = new junit.textui.TestRunner();
392	>	runner.setPrinter(new PithyResultPrinter(System.out));
393	>	return runner;
394	>	}
395	>
396	>	/**
397	>	* Runs all unit tests in the given test suite.
398	>	* Actual behavior influenced by jsr166.* system properties.
399	>	*/
400	>	static void main(Test suite, String[] args) {
401	>	if (useSecurityManager) {
402	>	System.err.println("Setting a permissive security manager");
403	>	Policy.setPolicy(permissivePolicy());
404	>	System.setSecurityManager(new SecurityManager());
405	>	}
406	>	for (int i = 0; i < suiteRuns; i++) {
407	>	TestResult result = newPithyTestRunner().doRun(suite);
408	>	if (!result.wasSuccessful())
409	>	System.exit(1);
410	>	System.gc();
411	>	System.runFinalization();
412	>	}
413	>	}
414	>
415	>	public static TestSuite newTestSuite(Object... suiteOrClasses) {
416	>	TestSuite suite = new TestSuite();
417	>	for (Object suiteOrClass : suiteOrClasses) {
418	>	if (suiteOrClass instanceof TestSuite)
419	>	suite.addTest((TestSuite) suiteOrClass);
420	>	else if (suiteOrClass instanceof Class)
421	>	suite.addTest(new TestSuite((Class<?>) suiteOrClass));
422	>	else
423	>	throw new ClassCastException("not a test suite or class");
424	>	}
425		return suite;
426		}
427
428	+	public static void addNamedTestClasses(TestSuite suite,
429	+	String... testClassNames) {
430	+	for (String testClassName : testClassNames) {
431	+	try {
432	+	Class<?> testClass = Class.forName(testClassName);
433	+	Method m = testClass.getDeclaredMethod("suite");
434	+	suite.addTest(newTestSuite((Test)m.invoke(null)));
435	+	} catch (ReflectiveOperationException e) {
436	+	throw new AssertionError("Missing test class", e);
437	+	}
438	+	}
439	+	}
440	+
441	+	public static final double JAVA_CLASS_VERSION;
442	+	public static final String JAVA_SPECIFICATION_VERSION;
443	+	static {
444	+	try {
445	+	JAVA_CLASS_VERSION = java.security.AccessController.doPrivileged(
446	+	new java.security.PrivilegedAction<Double>() {
447	+	public Double run() {
448	+	return Double.valueOf(System.getProperty("java.class.version"));}});
449	+	JAVA_SPECIFICATION_VERSION = java.security.AccessController.doPrivileged(
450	+	new java.security.PrivilegedAction<String>() {
451	+	public String run() {
452	+	return System.getProperty("java.specification.version");}});
453	+	} catch (Throwable t) {
454	+	throw new Error(t);
455	+	}
456	+	}
457	+
458	+	public static boolean atLeastJava6()  { return JAVA_CLASS_VERSION >= 50.0; }
459	+	public static boolean atLeastJava7()  { return JAVA_CLASS_VERSION >= 51.0; }
460	+	public static boolean atLeastJava8()  { return JAVA_CLASS_VERSION >= 52.0; }
461	+	public static boolean atLeastJava9()  { return JAVA_CLASS_VERSION >= 53.0; }
462	+	public static boolean atLeastJava10() { return JAVA_CLASS_VERSION >= 54.0; }
463	+	public static boolean atLeastJava11() { return JAVA_CLASS_VERSION >= 55.0; }
464	+	public static boolean atLeastJava12() { return JAVA_CLASS_VERSION >= 56.0; }
465	+	public static boolean atLeastJava13() { return JAVA_CLASS_VERSION >= 57.0; }
466	+	public static boolean atLeastJava14() { return JAVA_CLASS_VERSION >= 58.0; }
467	+	public static boolean atLeastJava15() { return JAVA_CLASS_VERSION >= 59.0; }
468	+	public static boolean atLeastJava16() { return JAVA_CLASS_VERSION >= 60.0; }
469	+	public static boolean atLeastJava17() { return JAVA_CLASS_VERSION >= 61.0; }
470	+
471	+	/**
472	+	* Collects all JSR166 unit tests as one suite.
473	+	*/
474	+	public static Test suite() {
475	+	// Java7+ test classes
476	+	TestSuite suite = newTestSuite(
477	+	ForkJoinPoolTest.suite(),
478	+	ForkJoinTaskTest.suite(),
479	+	RecursiveActionTest.suite(),
480	+	RecursiveTaskTest.suite(),
481	+	LinkedTransferQueueTest.suite(),
482	+	PhaserTest.suite(),
483	+	ThreadLocalRandomTest.suite(),
484	+	AbstractExecutorServiceTest.suite(),
485	+	AbstractQueueTest.suite(),
486	+	AbstractQueuedSynchronizerTest.suite(),
487	+	AbstractQueuedLongSynchronizerTest.suite(),
488	+	ArrayBlockingQueueTest.suite(),
489	+	ArrayDequeTest.suite(),
490	+	ArrayListTest.suite(),
491	+	AtomicBooleanTest.suite(),
492	+	AtomicIntegerArrayTest.suite(),
493	+	AtomicIntegerFieldUpdaterTest.suite(),
494	+	AtomicIntegerTest.suite(),
495	+	AtomicLongArrayTest.suite(),
496	+	AtomicLongFieldUpdaterTest.suite(),
497	+	AtomicLongTest.suite(),
498	+	AtomicMarkableReferenceTest.suite(),
499	+	AtomicReferenceArrayTest.suite(),
500	+	AtomicReferenceFieldUpdaterTest.suite(),
501	+	AtomicReferenceTest.suite(),
502	+	AtomicStampedReferenceTest.suite(),
503	+	ConcurrentHashMapTest.suite(),
504	+	ConcurrentLinkedDequeTest.suite(),
505	+	ConcurrentLinkedQueueTest.suite(),
506	+	ConcurrentSkipListMapTest.suite(),
507	+	ConcurrentSkipListSubMapTest.suite(),
508	+	ConcurrentSkipListSetTest.suite(),
509	+	ConcurrentSkipListSubSetTest.suite(),
510	+	CopyOnWriteArrayListTest.suite(),
511	+	CopyOnWriteArraySetTest.suite(),
512	+	CountDownLatchTest.suite(),
513	+	CountedCompleterTest.suite(),
514	+	CyclicBarrierTest.suite(),
515	+	DelayQueueTest.suite(),
516	+	EntryTest.suite(),
517	+	ExchangerTest.suite(),
518	+	ExecutorsTest.suite(),
519	+	ExecutorCompletionServiceTest.suite(),
520	+	FutureTaskTest.suite(),
521	+	HashtableTest.suite(),
522	+	LinkedBlockingDequeTest.suite(),
523	+	LinkedBlockingQueueTest.suite(),
524	+	LinkedListTest.suite(),
525	+	LockSupportTest.suite(),
526	+	PriorityBlockingQueueTest.suite(),
527	+	PriorityQueueTest.suite(),
528	+	ReentrantLockTest.suite(),
529	+	ReentrantReadWriteLockTest.suite(),
530	+	ScheduledExecutorTest.suite(),
531	+	ScheduledExecutorSubclassTest.suite(),
532	+	SemaphoreTest.suite(),
533	+	SynchronousQueueTest.suite(),
534	+	SystemTest.suite(),
535	+	ThreadLocalTest.suite(),
536	+	ThreadPoolExecutorTest.suite(),
537	+	ThreadPoolExecutorSubclassTest.suite(),
538	+	ThreadTest.suite(),
539	+	TimeUnitTest.suite(),
540	+	TreeMapTest.suite(),
541	+	TreeSetTest.suite(),
542	+	TreeSubMapTest.suite(),
543	+	TreeSubSetTest.suite(),
544	+	VectorTest.suite());
545	+
546	+	// Java8+ test classes
547	+	if (atLeastJava8()) {
548	+	String[] java8TestClassNames = {
549	+	"ArrayDeque8Test",
550	+	"Atomic8Test",
551	+	"CompletableFutureTest",
552	+	"ConcurrentHashMap8Test",
553	+	"CountedCompleter8Test",
554	+	"DoubleAccumulatorTest",
555	+	"DoubleAdderTest",
556	+	"ForkJoinPool8Test",
557	+	"ForkJoinTask8Test",
558	+	"HashMapTest",
559	+	"LinkedBlockingDeque8Test",
560	+	"LinkedBlockingQueue8Test",
561	+	"LinkedHashMapTest",
562	+	"LongAccumulatorTest",
563	+	"LongAdderTest",
564	+	"SplittableRandomTest",
565	+	"StampedLockTest",
566	+	"SubmissionPublisherTest",
567	+	"ThreadLocalRandom8Test",
568	+	"TimeUnit8Test",
569	+	};
570	+	addNamedTestClasses(suite, java8TestClassNames);
571	+	}
572	+
573	+	// Java9+ test classes
574	+	if (atLeastJava9()) {
575	+	String[] java9TestClassNames = {
576	+	"AtomicBoolean9Test",
577	+	"AtomicInteger9Test",
578	+	"AtomicIntegerArray9Test",
579	+	"AtomicLong9Test",
580	+	"AtomicLongArray9Test",
581	+	"AtomicReference9Test",
582	+	"AtomicReferenceArray9Test",
583	+	"ExecutorCompletionService9Test",
584	+	"ForkJoinPool9Test",
585	+	};
586	+	addNamedTestClasses(suite, java9TestClassNames);
587	+	}
588	+
589	+	return suite;
590	+	}
591	+
592	+	/** Returns list of junit-style test method names in given class. */
593	+	public static ArrayList<String> testMethodNames(Class<?> testClass) {
594	+	Method[] methods = testClass.getDeclaredMethods();
595	+	ArrayList<String> names = new ArrayList<>(methods.length);
596	+	for (Method method : methods) {
597	+	if (method.getName().startsWith("test")
598	+	&& Modifier.isPublic(method.getModifiers())
599	+	// method.getParameterCount() requires jdk8+
600	+	&& method.getParameterTypes().length == 0) {
601	+	names.add(method.getName());
602	+	}
603	+	}
604	+	return names;
605	+	}
606	+
607	+	/**
608	+	* Returns junit-style testSuite for the given test class, but
609	+	* parameterized by passing extra data to each test.
610	+	*/
611	+	public static <ExtraData> Test parameterizedTestSuite
612	+	(Class<? extends JSR166TestCase> testClass,
613	+	Class<ExtraData> dataClass,
614	+	ExtraData data) {
615	+	try {
616	+	TestSuite suite = new TestSuite();
617	+	Constructor c =
618	+	testClass.getDeclaredConstructor(dataClass, String.class);
619	+	for (String methodName : testMethodNames(testClass))
620	+	suite.addTest((Test) c.newInstance(data, methodName));
621	+	return suite;
622	+	} catch (ReflectiveOperationException e) {
623	+	throw new AssertionError(e);
624	+	}
625	+	}
626	+
627	+	/**
628	+	* Returns junit-style testSuite for the jdk8 extension of the
629	+	* given test class, but parameterized by passing extra data to
630	+	* each test.  Uses reflection to allow compilation in jdk7.
631	+	*/
632	+	public static <ExtraData> Test jdk8ParameterizedTestSuite
633	+	(Class<? extends JSR166TestCase> testClass,
634	+	Class<ExtraData> dataClass,
635	+	ExtraData data) {
636	+	if (atLeastJava8()) {
637	+	String name = testClass.getName();
638	+	String name8 = name.replaceAll("Test$", "8Test");
639	+	if (name.equals(name8)) throw new AssertionError(name);
640	+	try {
641	+	return (Test)
642	+	Class.forName(name8)
643	+	.getMethod("testSuite", dataClass)
644	+	.invoke(null, data);
645	+	} catch (ReflectiveOperationException e) {
646	+	throw new AssertionError(e);
647	+	}
648	+	} else {
649	+	return new TestSuite();
650	+	}
651	+	}
652	+
653	+	// Delays for timing-dependent tests, in milliseconds.
654
655		public static long SHORT_DELAY_MS;
656		public static long SMALL_DELAY_MS;
657		public static long MEDIUM_DELAY_MS;
658		public static long LONG_DELAY_MS;
659
660	+	private static final long RANDOM_TIMEOUT;
661	+	private static final long RANDOM_EXPIRED_TIMEOUT;
662	+	private static final TimeUnit RANDOM_TIMEUNIT;
663	+	static {
664	+	ThreadLocalRandom rnd = ThreadLocalRandom.current();
665	+	long[] timeouts = { Long.MIN_VALUE, -1, 0, 1, Long.MAX_VALUE };
666	+	RANDOM_TIMEOUT = timeouts[rnd.nextInt(timeouts.length)];
667	+	RANDOM_EXPIRED_TIMEOUT = timeouts[rnd.nextInt(3)];
668	+	TimeUnit[] timeUnits = TimeUnit.values();
669	+	RANDOM_TIMEUNIT = timeUnits[rnd.nextInt(timeUnits.length)];
670	+	}
671	+
672	+	/**
673	+	* Returns a timeout for use when any value at all will do.
674	+	*/
675	+	static long randomTimeout() { return RANDOM_TIMEOUT; }
676	+
677	+	/**
678	+	* Returns a timeout that means "no waiting", i.e. not positive.
679	+	*/
680	+	static long randomExpiredTimeout() { return RANDOM_EXPIRED_TIMEOUT; }
681
682		/**
683	<	* Return the shortest timed delay. This could
684	<	* be reimplmented to use for example a Property.
685	<	*/
683	>	* Returns a random non-null TimeUnit.
684	>	*/
685	>	static TimeUnit randomTimeUnit() { return RANDOM_TIMEUNIT; }
686	>
687	>	/**
688	>	* Returns the shortest timed delay. This can be scaled up for
689	>	* slow machines using the jsr166.delay.factor system property,
690	>	* or via jtreg's -timeoutFactor: flag.
691	>	* http://openjdk.java.net/jtreg/command-help.html
692	>	*/
693		protected long getShortDelay() {
694	<	return 100;
694	>	return (long) (50 * delayFactor);
695		}
696
160	–
697		/**
698	<	* Set delays as multiples of SHORT_DELAY.
698	>	* Sets delays as multiples of SHORT_DELAY.
699		*/
700	<	protected  void setDelays() {
700	>	protected void setDelays() {
701		SHORT_DELAY_MS = getShortDelay();
702	<	SMALL_DELAY_MS = SHORT_DELAY_MS * 5;
702	>	SMALL_DELAY_MS  = SHORT_DELAY_MS * 5;
703		MEDIUM_DELAY_MS = SHORT_DELAY_MS * 10;
704	<	LONG_DELAY_MS = SHORT_DELAY_MS * 50;
704	>	LONG_DELAY_MS   = SHORT_DELAY_MS * 200;
705	>	}
706	>
707	>	private static final long TIMEOUT_DELAY_MS
708	>	= (long) (12.0 * Math.cbrt(delayFactor));
709	>
710	>	/**
711	>	* Returns a timeout in milliseconds to be used in tests that verify
712	>	* that operations block or time out.  We want this to be longer
713	>	* than the OS scheduling quantum, but not too long, so don't scale
714	>	* linearly with delayFactor; we use "crazy" cube root instead.
715	>	*/
716	>	static long timeoutMillis() {
717	>	return TIMEOUT_DELAY_MS;
718		}
719
720		/**
721	<	* Flag set true if any threadAssert methods fail
721	>	* Returns a new Date instance representing a time at least
722	>	* delayMillis milliseconds in the future.
723		*/
724	<	volatile boolean threadFailed;
724	>	Date delayedDate(long delayMillis) {
725	>	// Add 1 because currentTimeMillis is known to round into the past.
726	>	return new Date(System.currentTimeMillis() + delayMillis + 1);
727	>	}
728
729		/**
730	<	* Initialize test to indicate that no thread assertions have failed
730	>	* The first exception encountered if any threadAssertXXX method fails.
731		*/
732	<	public void setUp() {
732	>	private final AtomicReference<Throwable> threadFailure
733	>	= new AtomicReference<>(null);
734	>
735	>	/**
736	>	* Records an exception so that it can be rethrown later in the test
737	>	* harness thread, triggering a test case failure.  Only the first
738	>	* failure is recorded; subsequent calls to this method from within
739	>	* the same test have no effect.
740	>	*/
741	>	public void threadRecordFailure(Throwable t) {
742	>	System.err.println(t);
743	>	dumpTestThreads();
744	>	threadFailure.compareAndSet(null, t);
745	>	}
746	>
747	>	public void setUp() {
748		setDelays();
749	<	threadFailed = false;
749	>	}
750	>
751	>	void tearDownFail(String format, Object... args) {
752	>	String msg = toString() + ": " + String.format(format, args);
753	>	System.err.println(msg);
754	>	dumpTestThreads();
755	>	throw new AssertionError(msg);
756		}
757
758		/**
759	<	* Trigger test case failure if any thread assertions have failed
759	>	* Extra checks that get done for all test cases.
760	>	*
761	>	* Triggers test case failure if any thread assertions have failed,
762	>	* by rethrowing, in the test harness thread, any exception recorded
763	>	* earlier by threadRecordFailure.
764	>	*
765	>	* Triggers test case failure if interrupt status is set in the main thread.
766		*/
767	<	public void tearDown() {
768	<	assertFalse(threadFailed);
767	>	public void tearDown() throws Exception {
768	>	Throwable t = threadFailure.getAndSet(null);
769	>	if (t != null) {
770	>	if (t instanceof Error)
771	>	throw (Error) t;
772	>	else if (t instanceof RuntimeException)
773	>	throw (RuntimeException) t;
774	>	else if (t instanceof Exception)
775	>	throw (Exception) t;
776	>	else
777	>	throw new AssertionError(t.toString(), t);
778	>	}
779	>
780	>	if (Thread.interrupted())
781	>	tearDownFail("interrupt status set in main thread");
782	>
783	>	checkForkJoinPoolThreadLeaks();
784		}
785
786		/**
787	<	* Fail, also setting status to indicate current testcase should fail
788	<	*/
787	>	* Finds missing PoolCleaners
788	>	*/
789	>	void checkForkJoinPoolThreadLeaks() throws InterruptedException {
790	>	Thread[] survivors = new Thread[7];
791	>	int count = Thread.enumerate(survivors);
792	>	for (int i = 0; i < count; i++) {
793	>	Thread thread = survivors[i];
794	>	String name = thread.getName();
795	>	if (name.startsWith("ForkJoinPool-")) {
796	>	// give thread some time to terminate
797	>	thread.join(LONG_DELAY_MS);
798	>	if (thread.isAlive())
799	>	tearDownFail("Found leaked ForkJoinPool thread thread=%s",
800	>	thread);
801	>	}
802	>	}
803	>
804	>	if (!ForkJoinPool.commonPool()
805	>	.awaitQuiescence(LONG_DELAY_MS, MILLISECONDS))
806	>	tearDownFail("ForkJoin common pool thread stuck");
807	>	}
808	>
809	>	/**
810	>	* Just like fail(reason), but additionally recording (using
811	>	* threadRecordFailure) any AssertionError thrown, so that the
812	>	* current testcase will fail.
813	>	*/
814		public void threadFail(String reason) {
815	<	threadFailed = true;
816	<	fail(reason);
815	>	try {
816	>	fail(reason);
817	>	} catch (AssertionError fail) {
818	>	threadRecordFailure(fail);
819	>	throw fail;
820	>	}
821		}
822
823		/**
824	<	* If expression not true, set status to indicate current testcase
825	<	* should fail
826	<	*/
824	>	* Just like assertTrue(b), but additionally recording (using
825	>	* threadRecordFailure) any AssertionError thrown, so that the
826	>	* current testcase will fail.
827	>	*/
828		public void threadAssertTrue(boolean b) {
829	<	if (!b) {
205	<	threadFailed = true;
829	>	try {
830		assertTrue(b);
831	+	} catch (AssertionError fail) {
832	+	threadRecordFailure(fail);
833	+	throw fail;
834		}
835		}
836
837		/**
838	<	* If expression not false, set status to indicate current testcase
839	<	* should fail
840	<	*/
838	>	* Just like assertFalse(b), but additionally recording (using
839	>	* threadRecordFailure) any AssertionError thrown, so that the
840	>	* current testcase will fail.
841	>	*/
842		public void threadAssertFalse(boolean b) {
843	<	if (b) {
216	<	threadFailed = true;
843	>	try {
844		assertFalse(b);
845	+	} catch (AssertionError fail) {
846	+	threadRecordFailure(fail);
847	+	throw fail;
848		}
849		}
850
851		/**
852	<	* If argument not null, set status to indicate current testcase
853	<	* should fail
854	<	*/
852	>	* Just like assertNull(x), but additionally recording (using
853	>	* threadRecordFailure) any AssertionError thrown, so that the
854	>	* current testcase will fail.
855	>	*/
856		public void threadAssertNull(Object x) {
857	<	if (x != null) {
227	<	threadFailed = true;
857	>	try {
858		assertNull(x);
859	+	} catch (AssertionError fail) {
860	+	threadRecordFailure(fail);
861	+	throw fail;
862		}
863		}
864
865		/**
866	<	* If arguments not equal, set status to indicate current testcase
867	<	* should fail
868	<	*/
866	>	* Just like assertEquals(x, y), but additionally recording (using
867	>	* threadRecordFailure) any AssertionError thrown, so that the
868	>	* current testcase will fail.
869	>	*/
870		public void threadAssertEquals(long x, long y) {
871	<	if (x != y) {
238	<	threadFailed = true;
871	>	try {
872		assertEquals(x, y);
873	+	} catch (AssertionError fail) {
874	+	threadRecordFailure(fail);
875	+	throw fail;
876		}
877		}
878
879		/**
880	<	* If arguments not equal, set status to indicate current testcase
881	<	* should fail
882	<	*/
880	>	* Just like assertEquals(x, y), but additionally recording (using
881	>	* threadRecordFailure) any AssertionError thrown, so that the
882	>	* current testcase will fail.
883	>	*/
884		public void threadAssertEquals(Object x, Object y) {
885	<	if (x != y && (x == null || !x.equals(y))) {
249	<	threadFailed = true;
885	>	try {
886		assertEquals(x, y);
887	+	} catch (AssertionError fail) {
888	+	threadRecordFailure(fail);
889	+	throw fail;
890	+	} catch (Throwable fail) {
891	+	threadUnexpectedException(fail);
892		}
893		}
894
895		/**
896	<	* threadFail with message "should throw exception"
897	<	*/
896	>	* Just like assertSame(x, y), but additionally recording (using
897	>	* threadRecordFailure) any AssertionError thrown, so that the
898	>	* current testcase will fail.
899	>	*/
900	>	public void threadAssertSame(Object x, Object y) {
901	>	try {
902	>	assertSame(x, y);
903	>	} catch (AssertionError fail) {
904	>	threadRecordFailure(fail);
905	>	throw fail;
906	>	}
907	>	}
908	>
909	>	/**
910	>	* Calls threadFail with message "should throw exception".
911	>	*/
912		public void threadShouldThrow() {
913	<	threadFailed = true;
914	<	fail("should throw exception");
913	>	threadFail("should throw exception");
914	>	}
915	>
916	>	/**
917	>	* Calls threadFail with message "should throw" + exceptionName.
918	>	*/
919	>	public void threadShouldThrow(String exceptionName) {
920	>	threadFail("should throw " + exceptionName);
921	>	}
922	>
923	>	/**
924	>	* Records the given exception using {@link #threadRecordFailure},
925	>	* then rethrows the exception, wrapping it in an AssertionError
926	>	* if necessary.
927	>	*/
928	>	public void threadUnexpectedException(Throwable t) {
929	>	threadRecordFailure(t);
930	>	t.printStackTrace();
931	>	if (t instanceof RuntimeException)
932	>	throw (RuntimeException) t;
933	>	else if (t instanceof Error)
934	>	throw (Error) t;
935	>	else
936	>	throw new AssertionError("unexpected exception: " + t, t);
937	>	}
938	>
939	>	/**
940	>	* Delays, via Thread.sleep, for the given millisecond delay, but
941	>	* if the sleep is shorter than specified, may re-sleep or yield
942	>	* until time elapses.  Ensures that the given time, as measured
943	>	* by System.nanoTime(), has elapsed.
944	>	*/
945	>	static void delay(long millis) throws InterruptedException {
946	>	long nanos = millis * (1000 * 1000);
947	>	final long wakeupTime = System.nanoTime() + nanos;
948	>	do {
949	>	if (millis > 0L)
950	>	Thread.sleep(millis);
951	>	else // too short to sleep
952	>	Thread.yield();
953	>	nanos = wakeupTime - System.nanoTime();
954	>	millis = nanos / (1000 * 1000);
955	>	} while (nanos >= 0L);
956	>	}
957	>
958	>	/**
959	>	* Allows use of try-with-resources with per-test thread pools.
960	>	*/
961	>	class PoolCleaner implements AutoCloseable {
962	>	private final ExecutorService pool;
963	>	public PoolCleaner(ExecutorService pool) { this.pool = pool; }
964	>	public void close() { joinPool(pool); }
965		}
966
967		/**
968	<	* threadFail with message "Unexpected exception"
968	>	* An extension of PoolCleaner that has an action to release the pool.
969		*/
970	<	public void threadUnexpectedException() {
971	<	threadFailed = true;
972	<	fail("Unexpected exception");
970	>	class PoolCleanerWithReleaser extends PoolCleaner {
971	>	private final Runnable releaser;
972	>	public PoolCleanerWithReleaser(ExecutorService pool, Runnable releaser) {
973	>	super(pool);
974	>	this.releaser = releaser;
975	>	}
976	>	public void close() {
977	>	try {
978	>	releaser.run();
979	>	} finally {
980	>	super.close();
981	>	}
982	>	}
983	>	}
984	>
985	>	PoolCleaner cleaner(ExecutorService pool) {
986	>	return new PoolCleaner(pool);
987	>	}
988	>
989	>	PoolCleaner cleaner(ExecutorService pool, Runnable releaser) {
990	>	return new PoolCleanerWithReleaser(pool, releaser);
991	>	}
992	>
993	>	PoolCleaner cleaner(ExecutorService pool, CountDownLatch latch) {
994	>	return new PoolCleanerWithReleaser(pool, releaser(latch));
995		}
996
997	+	Runnable releaser(final CountDownLatch latch) {
998	+	return new Runnable() { public void run() {
999	+	do { latch.countDown(); }
1000	+	while (latch.getCount() > 0);
1001	+	}};
1002	+	}
1003	+
1004	+	PoolCleaner cleaner(ExecutorService pool, AtomicBoolean flag) {
1005	+	return new PoolCleanerWithReleaser(pool, releaser(flag));
1006	+	}
1007	+
1008	+	Runnable releaser(final AtomicBoolean flag) {
1009	+	return new Runnable() { public void run() { flag.set(true); }};
1010	+	}
1011
1012		/**
1013	<	* Wait out termination of a thread pool or fail doing so
1013	>	* Waits out termination of a thread pool or fails doing so.
1014		*/
1015	<	public void joinPool(ExecutorService exec) {
1015	>	void joinPool(ExecutorService pool) {
1016		try {
1017	<	exec.shutdown();
1018	<	assertTrue(exec.awaitTermination(LONG_DELAY_MS, TimeUnit.MILLISECONDS));
1019	<	} catch(InterruptedException ie) {
1020	<	fail("Unexpected exception");
1017	>	pool.shutdown();
1018	>	if (!pool.awaitTermination(2 * LONG_DELAY_MS, MILLISECONDS)) {
1019	>	try {
1020	>	threadFail("ExecutorService " + pool +
1021	>	" did not terminate in a timely manner");
1022	>	} finally {
1023	>	// last resort, for the benefit of subsequent tests
1024	>	pool.shutdownNow();
1025	>	pool.awaitTermination(MEDIUM_DELAY_MS, MILLISECONDS);
1026	>	}
1027	>	}
1028	>	} catch (SecurityException ok) {
1029	>	// Allowed in case test doesn't have privs
1030	>	} catch (InterruptedException fail) {
1031	>	threadFail("Unexpected InterruptedException");
1032		}
1033		}
1034
1035	+	/**
1036	+	* Like Runnable, but with the freedom to throw anything.
1037	+	* junit folks had the same idea:
1038	+	* http://junit.org/junit5/docs/snapshot/api/org/junit/gen5/api/Executable.html
1039	+	*/
1040	+	interface Action { public void run() throws Throwable; }
1041
1042		/**
1043	<	* fail with message "should throw exception"
1044	<	*/
1043	>	* Runs all the given actions in parallel, failing if any fail.
1044	>	* Useful for running multiple variants of tests that are
1045	>	* necessarily individually slow because they must block.
1046	>	*/
1047	>	void testInParallel(Action ... actions) {
1048	>	ExecutorService pool = Executors.newCachedThreadPool();
1049	>	try (PoolCleaner cleaner = cleaner(pool)) {
1050	>	ArrayList<Future<?>> futures = new ArrayList<>(actions.length);
1051	>	for (final Action action : actions)
1052	>	futures.add(pool.submit(new CheckedRunnable() {
1053	>	public void realRun() throws Throwable { action.run();}}));
1054	>	for (Future<?> future : futures)
1055	>	try {
1056	>	assertNull(future.get(LONG_DELAY_MS, MILLISECONDS));
1057	>	} catch (ExecutionException ex) {
1058	>	threadUnexpectedException(ex.getCause());
1059	>	} catch (Exception ex) {
1060	>	threadUnexpectedException(ex);
1061	>	}
1062	>	}
1063	>	}
1064	>
1065	>	/**
1066	>	* A debugging tool to print stack traces of most threads, as jstack does.
1067	>	* Uninteresting threads are filtered out.
1068	>	*/
1069	>	static void dumpTestThreads() {
1070	>	SecurityManager sm = System.getSecurityManager();
1071	>	if (sm != null) {
1072	>	try {
1073	>	System.setSecurityManager(null);
1074	>	} catch (SecurityException giveUp) {
1075	>	return;
1076	>	}
1077	>	}
1078	>
1079	>	ThreadMXBean threadMXBean = ManagementFactory.getThreadMXBean();
1080	>	System.err.println("------ stacktrace dump start ------");
1081	>	for (ThreadInfo info : threadMXBean.dumpAllThreads(true, true)) {
1082	>	final String name = info.getThreadName();
1083	>	String lockName;
1084	>	if ("Signal Dispatcher".equals(name))
1085	>	continue;
1086	>	if ("Reference Handler".equals(name)
1087	>	&& (lockName = info.getLockName()) != null
1088	>	&& lockName.startsWith("java.lang.ref.Reference$Lock"))
1089	>	continue;
1090	>	if ("Finalizer".equals(name)
1091	>	&& (lockName = info.getLockName()) != null
1092	>	&& lockName.startsWith("java.lang.ref.ReferenceQueue$Lock"))
1093	>	continue;
1094	>	if ("checkForWedgedTest".equals(name))
1095	>	continue;
1096	>	System.err.print(info);
1097	>	}
1098	>	System.err.println("------ stacktrace dump end ------");
1099	>
1100	>	if (sm != null) System.setSecurityManager(sm);
1101	>	}
1102	>
1103	>	/**
1104	>	* Checks that thread eventually enters the expected blocked thread state.
1105	>	*/
1106	>	void assertThreadBlocks(Thread thread, Thread.State expected) {
1107	>	// always sleep at least 1 ms, with high probability avoiding
1108	>	// transitory states
1109	>	for (long retries = LONG_DELAY_MS * 3 / 4; retries-->0; ) {
1110	>	try { delay(1); }
1111	>	catch (InterruptedException fail) {
1112	>	throw new AssertionError("Unexpected InterruptedException", fail);
1113	>	}
1114	>	Thread.State s = thread.getState();
1115	>	if (s == expected)
1116	>	return;
1117	>	else if (s == Thread.State.TERMINATED)
1118	>	fail("Unexpected thread termination");
1119	>	}
1120	>	fail("timed out waiting for thread to enter thread state " + expected);
1121	>	}
1122	>
1123	>	/**
1124	>	* Checks that future.get times out, with the default timeout of
1125	>	* {@code timeoutMillis()}.
1126	>	*/
1127	>	void assertFutureTimesOut(Future future) {
1128	>	assertFutureTimesOut(future, timeoutMillis());
1129	>	}
1130	>
1131	>	/**
1132	>	* Checks that future.get times out, with the given millisecond timeout.
1133	>	*/
1134	>	void assertFutureTimesOut(Future future, long timeoutMillis) {
1135	>	long startTime = System.nanoTime();
1136	>	try {
1137	>	future.get(timeoutMillis, MILLISECONDS);
1138	>	shouldThrow();
1139	>	} catch (TimeoutException success) {
1140	>	} catch (Exception fail) {
1141	>	threadUnexpectedException(fail);
1142	>	} finally { future.cancel(true); }
1143	>	assertTrue(millisElapsedSince(startTime) >= timeoutMillis);
1144	>	}
1145	>
1146	>	/**
1147	>	* Fails with message "should throw exception".
1148	>	*/
1149		public void shouldThrow() {
1150		fail("Should throw exception");
1151		}
1152
1153		/**
1154	<	* fail with message "Unexpected exception"
1154	>	* Fails with message "should throw " + exceptionName.
1155		*/
1156	<	public void unexpectedException() {
1157	<	fail("Unexpected exception");
1156	>	public void shouldThrow(String exceptionName) {
1157	>	fail("Should throw " + exceptionName);
1158		}
1159
1160	+	/**
1161	+	* The maximum number of consecutive spurious wakeups we should
1162	+	* tolerate (from APIs like LockSupport.park) before failing a test.
1163	+	*/
1164	+	static final int MAX_SPURIOUS_WAKEUPS = 10;
1165
1166		/**
1167		* The number of elements to place in collections, arrays, etc.
1168		*/
1169	<	static final int SIZE = 20;
1169	>	public static final int SIZE = 20;
1170
1171		// Some convenient Integer constants
1172
1173	<	static final Integer zero = new Integer(0);
1174	<	static final Integer one = new Integer(1);
1175	<	static final Integer two = new Integer(2);
1176	<	static final Integer three  = new Integer(3);
1177	<	static final Integer four  = new Integer(4);
1178	<	static final Integer five  = new Integer(5);
1179	<	static final Integer six = new Integer(6);
1180	<	static final Integer seven = new Integer(7);
1181	<	static final Integer eight = new Integer(8);
1182	<	static final Integer nine = new Integer(9);
1183	<	static final Integer m1  = new Integer(-1);
1184	<	static final Integer m2  = new Integer(-2);
1185	<	static final Integer m3  = new Integer(-3);
1186	<	static final Integer m4 = new Integer(-4);
1187	<	static final Integer m5 = new Integer(-5);
1188	<	static final Integer m10 = new Integer(-10);
1173	>	public static final Integer zero  = new Integer(0);
1174	>	public static final Integer one   = new Integer(1);
1175	>	public static final Integer two   = new Integer(2);
1176	>	public static final Integer three = new Integer(3);
1177	>	public static final Integer four  = new Integer(4);
1178	>	public static final Integer five  = new Integer(5);
1179	>	public static final Integer six   = new Integer(6);
1180	>	public static final Integer seven = new Integer(7);
1181	>	public static final Integer eight = new Integer(8);
1182	>	public static final Integer nine  = new Integer(9);
1183	>	public static final Integer m1  = new Integer(-1);
1184	>	public static final Integer m2  = new Integer(-2);
1185	>	public static final Integer m3  = new Integer(-3);
1186	>	public static final Integer m4  = new Integer(-4);
1187	>	public static final Integer m5  = new Integer(-5);
1188	>	public static final Integer m6  = new Integer(-6);
1189	>	public static final Integer m10 = new Integer(-10);
1190	>
1191	>	/**
1192	>	* Runs Runnable r with a security policy that permits precisely
1193	>	* the specified permissions.  If there is no current security
1194	>	* manager, the runnable is run twice, both with and without a
1195	>	* security manager.  We require that any security manager permit
1196	>	* getPolicy/setPolicy.
1197	>	*/
1198	>	public void runWithPermissions(Runnable r, Permission... permissions) {
1199	>	SecurityManager sm = System.getSecurityManager();
1200	>	if (sm == null) {
1201	>	r.run();
1202	>	}
1203	>	runWithSecurityManagerWithPermissions(r, permissions);
1204	>	}
1205	>
1206	>	/**
1207	>	* Runs Runnable r with a security policy that permits precisely
1208	>	* the specified permissions.  If there is no current security
1209	>	* manager, a temporary one is set for the duration of the
1210	>	* Runnable.  We require that any security manager permit
1211	>	* getPolicy/setPolicy.
1212	>	*/
1213	>	public void runWithSecurityManagerWithPermissions(Runnable r,
1214	>	Permission... permissions) {
1215	>	SecurityManager sm = System.getSecurityManager();
1216	>	if (sm == null) {
1217	>	Policy savedPolicy = Policy.getPolicy();
1218	>	try {
1219	>	Policy.setPolicy(permissivePolicy());
1220	>	System.setSecurityManager(new SecurityManager());
1221	>	runWithSecurityManagerWithPermissions(r, permissions);
1222	>	} finally {
1223	>	System.setSecurityManager(null);
1224	>	Policy.setPolicy(savedPolicy);
1225	>	}
1226	>	} else {
1227	>	Policy savedPolicy = Policy.getPolicy();
1228	>	AdjustablePolicy policy = new AdjustablePolicy(permissions);
1229	>	Policy.setPolicy(policy);
1230
1231	+	try {
1232	+	r.run();
1233	+	} finally {
1234	+	policy.addPermission(new SecurityPermission("setPolicy"));
1235	+	Policy.setPolicy(savedPolicy);
1236	+	}
1237	+	}
1238	+	}
1239
1240	<	// Some convenient Runnable classes
1240	>	/**
1241	>	* Runs a runnable without any permissions.
1242	>	*/
1243	>	public void runWithoutPermissions(Runnable r) {
1244	>	runWithPermissions(r);
1245	>	}
1246
1247	<	static class NoOpRunnable implements Runnable {
1248	<	public void run() {}
1247	>	/**
1248	>	* A security policy where new permissions can be dynamically added
1249	>	* or all cleared.
1250	>	*/
1251	>	public static class AdjustablePolicy extends java.security.Policy {
1252	>	Permissions perms = new Permissions();
1253	>	AdjustablePolicy(Permission... permissions) {
1254	>	for (Permission permission : permissions)
1255	>	perms.add(permission);
1256	>	}
1257	>	void addPermission(Permission perm) { perms.add(perm); }
1258	>	void clearPermissions() { perms = new Permissions(); }
1259	>	public PermissionCollection getPermissions(CodeSource cs) {
1260	>	return perms;
1261	>	}
1262	>	public PermissionCollection getPermissions(ProtectionDomain pd) {
1263	>	return perms;
1264	>	}
1265	>	public boolean implies(ProtectionDomain pd, Permission p) {
1266	>	return perms.implies(p);
1267	>	}
1268	>	public void refresh() {}
1269	>	public String toString() {
1270	>	List<Permission> ps = new ArrayList<>();
1271	>	for (Enumeration<Permission> e = perms.elements(); e.hasMoreElements();)
1272	>	ps.add(e.nextElement());
1273	>	return "AdjustablePolicy with permissions " + ps;
1274	>	}
1275		}
1276
1277	<	static class NoOpCallable implements Callable {
1278	<	public Object call() { return Boolean.TRUE; }
1277	>	/**
1278	>	* Returns a policy containing all the permissions we ever need.
1279	>	*/
1280	>	public static Policy permissivePolicy() {
1281	>	return new AdjustablePolicy
1282	>	// Permissions j.u.c. needs directly
1283	>	(new RuntimePermission("modifyThread"),
1284	>	new RuntimePermission("getClassLoader"),
1285	>	new RuntimePermission("setContextClassLoader"),
1286	>	// Permissions needed to change permissions!
1287	>	new SecurityPermission("getPolicy"),
1288	>	new SecurityPermission("setPolicy"),
1289	>	new RuntimePermission("setSecurityManager"),
1290	>	// Permissions needed by the junit test harness
1291	>	new RuntimePermission("accessDeclaredMembers"),
1292	>	new PropertyPermission("*", "read"),
1293	>	new java.io.FilePermission("<<ALL FILES>>", "read"));
1294		}
1295
1296	<	class ShortRunnable implements Runnable {
1297	<	public void run() {
1298	<	try {
1299	<	Thread.sleep(SHORT_DELAY_MS);
1300	<	}
1301	<	catch(Exception e) {
1302	<	threadUnexpectedException();
1303	<	}
1296	>	/**
1297	>	* Sleeps until the given time has elapsed.
1298	>	* Throws AssertionError if interrupted.
1299	>	*/
1300	>	static void sleep(long millis) {
1301	>	try {
1302	>	delay(millis);
1303	>	} catch (InterruptedException fail) {
1304	>	throw new AssertionError("Unexpected InterruptedException", fail);
1305		}
1306		}
1307
1308	<	class ShortInterruptedRunnable implements Runnable {
1309	<	public void run() {
1310	<	try {
1311	<	Thread.sleep(SHORT_DELAY_MS);
1312	<	threadShouldThrow();
1313	<	}
1314	<	catch(InterruptedException success) {
1308	>	/**
1309	>	* Spin-waits up to the specified number of milliseconds for the given
1310	>	* thread to enter a wait state: BLOCKED, WAITING, or TIMED_WAITING.
1311	>	* @param waitingForGodot if non-null, an additional condition to satisfy
1312	>	*/
1313	>	void waitForThreadToEnterWaitState(Thread thread, long timeoutMillis,
1314	>	Callable<Boolean> waitingForGodot) {
1315	>	for (long startTime = 0L;;) {
1316	>	switch (thread.getState()) {
1317	>	default: break;
1318	>	case BLOCKED: case WAITING: case TIMED_WAITING:
1319	>	try {
1320	>	if (waitingForGodot == null || waitingForGodot.call())
1321	>	return;
1322	>	} catch (Throwable fail) { threadUnexpectedException(fail); }
1323	>	break;
1324	>	case TERMINATED:
1325	>	fail("Unexpected thread termination");
1326	>	}
1327	>
1328	>	if (startTime == 0L)
1329	>	startTime = System.nanoTime();
1330	>	else if (millisElapsedSince(startTime) > timeoutMillis) {
1331	>	assertTrue(thread.isAlive());
1332	>	if (waitingForGodot == null
1333	>	|| thread.getState() == Thread.State.RUNNABLE)
1334	>	fail("timed out waiting for thread to enter wait state");
1335	>	else
1336	>	fail("timed out waiting for condition, thread state="
1337	>	+ thread.getState());
1338		}
1339	+	Thread.yield();
1340		}
1341		}
1342
1343	<	class SmallRunnable implements Runnable {
1344	<	public void run() {
1345	<	try {
1346	<	Thread.sleep(SMALL_DELAY_MS);
1347	<	}
1348	<	catch(Exception e) {
1349	<	threadUnexpectedException();
1343	>	/**
1344	>	* Spin-waits up to the specified number of milliseconds for the given
1345	>	* thread to enter a wait state: BLOCKED, WAITING, or TIMED_WAITING.
1346	>	*/
1347	>	void waitForThreadToEnterWaitState(Thread thread, long timeoutMillis) {
1348	>	waitForThreadToEnterWaitState(thread, timeoutMillis, null);
1349	>	}
1350	>
1351	>	/**
1352	>	* Spin-waits up to LONG_DELAY_MS milliseconds for the given thread to
1353	>	* enter a wait state: BLOCKED, WAITING, or TIMED_WAITING.
1354	>	*/
1355	>	void waitForThreadToEnterWaitState(Thread thread) {
1356	>	waitForThreadToEnterWaitState(thread, LONG_DELAY_MS, null);
1357	>	}
1358	>
1359	>	/**
1360	>	* Spin-waits up to LONG_DELAY_MS milliseconds for the given thread to
1361	>	* enter a wait state: BLOCKED, WAITING, or TIMED_WAITING,
1362	>	* and additionally satisfy the given condition.
1363	>	*/
1364	>	void waitForThreadToEnterWaitState(Thread thread,
1365	>	Callable<Boolean> waitingForGodot) {
1366	>	waitForThreadToEnterWaitState(thread, LONG_DELAY_MS, waitingForGodot);
1367	>	}
1368	>
1369	>	/**
1370	>	* Returns the number of milliseconds since time given by
1371	>	* startNanoTime, which must have been previously returned from a
1372	>	* call to {@link System#nanoTime()}.
1373	>	*/
1374	>	static long millisElapsedSince(long startNanoTime) {
1375	>	return NANOSECONDS.toMillis(System.nanoTime() - startNanoTime);
1376	>	}
1377	>
1378	>	//     void assertTerminatesPromptly(long timeoutMillis, Runnable r) {
1379	>	//         long startTime = System.nanoTime();
1380	>	//         try {
1381	>	//             r.run();
1382	>	//         } catch (Throwable fail) { threadUnexpectedException(fail); }
1383	>	//         if (millisElapsedSince(startTime) > timeoutMillis/2)
1384	>	//             throw new AssertionError("did not return promptly");
1385	>	//     }
1386	>
1387	>	//     void assertTerminatesPromptly(Runnable r) {
1388	>	//         assertTerminatesPromptly(LONG_DELAY_MS/2, r);
1389	>	//     }
1390	>
1391	>	/**
1392	>	* Checks that timed f.get() returns the expected value, and does not
1393	>	* wait for the timeout to elapse before returning.
1394	>	*/
1395	>	<T> void checkTimedGet(Future<T> f, T expectedValue, long timeoutMillis) {
1396	>	long startTime = System.nanoTime();
1397	>	T actual = null;
1398	>	try {
1399	>	actual = f.get(timeoutMillis, MILLISECONDS);
1400	>	} catch (Throwable fail) { threadUnexpectedException(fail); }
1401	>	assertEquals(expectedValue, actual);
1402	>	if (millisElapsedSince(startTime) > timeoutMillis/2)
1403	>	throw new AssertionError("timed get did not return promptly");
1404	>	}
1405	>
1406	>	<T> void checkTimedGet(Future<T> f, T expectedValue) {
1407	>	checkTimedGet(f, expectedValue, LONG_DELAY_MS);
1408	>	}
1409	>
1410	>	/**
1411	>	* Returns a new started daemon Thread running the given runnable.
1412	>	*/
1413	>	Thread newStartedThread(Runnable runnable) {
1414	>	Thread t = new Thread(runnable);
1415	>	t.setDaemon(true);
1416	>	t.start();
1417	>	return t;
1418	>	}
1419	>
1420	>	/**
1421	>	* Waits for the specified time (in milliseconds) for the thread
1422	>	* to terminate (using {@link Thread#join(long)}), else interrupts
1423	>	* the thread (in the hope that it may terminate later) and fails.
1424	>	*/
1425	>	void awaitTermination(Thread t, long timeoutMillis) {
1426	>	try {
1427	>	t.join(timeoutMillis);
1428	>	} catch (InterruptedException fail) {
1429	>	threadUnexpectedException(fail);
1430	>	} finally {
1431	>	if (t.getState() != Thread.State.TERMINATED) {
1432	>	t.interrupt();
1433	>	threadFail("timed out waiting for thread to terminate");
1434		}
1435		}
1436		}
1437
1438	<	class SmallPossiblyInterruptedRunnable implements Runnable {
1439	<	public void run() {
1438	>	/**
1439	>	* Waits for LONG_DELAY_MS milliseconds for the thread to
1440	>	* terminate (using {@link Thread#join(long)}), else interrupts
1441	>	* the thread (in the hope that it may terminate later) and fails.
1442	>	*/
1443	>	void awaitTermination(Thread t) {
1444	>	awaitTermination(t, LONG_DELAY_MS);
1445	>	}
1446	>
1447	>	// Some convenient Runnable classes
1448	>
1449	>	public abstract class CheckedRunnable implements Runnable {
1450	>	protected abstract void realRun() throws Throwable;
1451	>
1452	>	public final void run() {
1453		try {
1454	<	Thread.sleep(SMALL_DELAY_MS);
1455	<	}
1456	<	catch(Exception e) {
1454	>	realRun();
1455	>	} catch (Throwable fail) {
1456	>	threadUnexpectedException(fail);
1457		}
1458		}
1459		}
1460
1461	<	class SmallCallable implements Callable {
1462	<	public Object call() {
1461	>	public abstract class ThreadShouldThrow extends Thread {
1462	>	protected abstract void realRun() throws Throwable;
1463	>
1464	>	final Class<?> exceptionClass;
1465	>
1466	>	<T extends Throwable> ThreadShouldThrow(Class<T> exceptionClass) {
1467	>	this.exceptionClass = exceptionClass;
1468	>	}
1469	>
1470	>	public final void run() {
1471		try {
1472	<	Thread.sleep(SMALL_DELAY_MS);
1472	>	realRun();
1473	>	} catch (Throwable t) {
1474	>	if (! exceptionClass.isInstance(t))
1475	>	threadUnexpectedException(t);
1476	>	return;
1477		}
1478	<	catch(Exception e) {
383	<	threadUnexpectedException();
384	<	}
385	<	return Boolean.TRUE;
1478	>	threadShouldThrow(exceptionClass.getSimpleName());
1479		}
1480		}
1481
1482	<	class SmallInterruptedRunnable implements Runnable {
1483	<	public void run() {
1482	>	public abstract class CheckedInterruptedRunnable implements Runnable {
1483	>	protected abstract void realRun() throws Throwable;
1484	>
1485	>	public final void run() {
1486		try {
1487	<	Thread.sleep(SMALL_DELAY_MS);
1488	<	threadShouldThrow();
1489	<	}
1490	<	catch(InterruptedException success) {
1487	>	realRun();
1488	>	} catch (InterruptedException success) {
1489	>	threadAssertFalse(Thread.interrupted());
1490	>	return;
1491	>	} catch (Throwable fail) {
1492	>	threadUnexpectedException(fail);
1493		}
1494	+	threadShouldThrow("InterruptedException");
1495		}
1496		}
1497
1498	+	public abstract class CheckedCallable<T> implements Callable<T> {
1499	+	protected abstract T realCall() throws Throwable;
1500
1501	<	class MediumRunnable implements Runnable {
402	<	public void run() {
1501	>	public final T call() {
1502		try {
1503	<	Thread.sleep(MEDIUM_DELAY_MS);
1504	<	}
1505	<	catch(Exception e) {
407	<	threadUnexpectedException();
1503	>	return realCall();
1504	>	} catch (Throwable fail) {
1505	>	threadUnexpectedException(fail);
1506		}
1507	+	throw new AssertionError("unreached");
1508		}
1509		}
1510
1511	<	class MediumInterruptedRunnable implements Runnable {
1512	<	public void run() {
1513	<	try {
1514	<	Thread.sleep(MEDIUM_DELAY_MS);
1515	<	threadShouldThrow();
1516	<	}
1517	<	catch(InterruptedException success) {
1518	<	}
1511	>	public static class NoOpRunnable implements Runnable {
1512	>	public void run() {}
1513	>	}
1514	>
1515	>	public static class NoOpCallable implements Callable {
1516	>	public Object call() { return Boolean.TRUE; }
1517	>	}
1518	>
1519	>	public static final String TEST_STRING = "a test string";
1520	>
1521	>	public static class StringTask implements Callable<String> {
1522	>	final String value;
1523	>	public StringTask() { this(TEST_STRING); }
1524	>	public StringTask(String value) { this.value = value; }
1525	>	public String call() { return value; }
1526	>	}
1527	>
1528	>	public Callable<String> latchAwaitingStringTask(final CountDownLatch latch) {
1529	>	return new CheckedCallable<String>() {
1530	>	protected String realCall() {
1531	>	try {
1532	>	latch.await();
1533	>	} catch (InterruptedException quittingTime) {}
1534	>	return TEST_STRING;
1535	>	}};
1536	>	}
1537	>
1538	>	public Runnable countDowner(final CountDownLatch latch) {
1539	>	return new CheckedRunnable() {
1540	>	public void realRun() throws InterruptedException {
1541	>	latch.countDown();
1542	>	}};
1543	>	}
1544	>
1545	>	class LatchAwaiter extends CheckedRunnable {
1546	>	static final int NEW = 0;
1547	>	static final int RUNNING = 1;
1548	>	static final int DONE = 2;
1549	>	final CountDownLatch latch;
1550	>	int state = NEW;
1551	>	LatchAwaiter(CountDownLatch latch) { this.latch = latch; }
1552	>	public void realRun() throws InterruptedException {
1553	>	state = 1;
1554	>	await(latch);
1555	>	state = 2;
1556		}
1557		}
1558
1559	<	class MediumPossiblyInterruptedRunnable implements Runnable {
1560	<	public void run() {
1561	<	try {
1562	<	Thread.sleep(MEDIUM_DELAY_MS);
1563	<	}
1564	<	catch(InterruptedException success) {
1565	<	}
1559	>	public LatchAwaiter awaiter(CountDownLatch latch) {
1560	>	return new LatchAwaiter(latch);
1561	>	}
1562	>
1563	>	public void await(CountDownLatch latch, long timeoutMillis) {
1564	>	boolean timedOut = false;
1565	>	try {
1566	>	timedOut = !latch.await(timeoutMillis, MILLISECONDS);
1567	>	} catch (Throwable fail) {
1568	>	threadUnexpectedException(fail);
1569		}
1570	+	if (timedOut)
1571	+	fail("timed out waiting for CountDownLatch for "
1572	+	+ (timeoutMillis/1000) + " sec");
1573	+	}
1574	+
1575	+	public void await(CountDownLatch latch) {
1576	+	await(latch, LONG_DELAY_MS);
1577	+	}
1578	+
1579	+	public void await(Semaphore semaphore) {
1580	+	boolean timedOut = false;
1581	+	try {
1582	+	timedOut = !semaphore.tryAcquire(LONG_DELAY_MS, MILLISECONDS);
1583	+	} catch (Throwable fail) {
1584	+	threadUnexpectedException(fail);
1585	+	}
1586	+	if (timedOut)
1587	+	fail("timed out waiting for Semaphore for "
1588	+	+ (LONG_DELAY_MS/1000) + " sec");
1589	+	}
1590	+
1591	+	public void await(CyclicBarrier barrier) {
1592	+	try {
1593	+	barrier.await(LONG_DELAY_MS, MILLISECONDS);
1594	+	} catch (Throwable fail) {
1595	+	threadUnexpectedException(fail);
1596	+	}
1597	+	}
1598	+
1599	+	//     /**
1600	+	//      * Spin-waits up to LONG_DELAY_MS until flag becomes true.
1601	+	//      */
1602	+	//     public void await(AtomicBoolean flag) {
1603	+	//         await(flag, LONG_DELAY_MS);
1604	+	//     }
1605	+
1606	+	//     /**
1607	+	//      * Spin-waits up to the specified timeout until flag becomes true.
1608	+	//      */
1609	+	//     public void await(AtomicBoolean flag, long timeoutMillis) {
1610	+	//         long startTime = System.nanoTime();
1611	+	//         while (!flag.get()) {
1612	+	//             if (millisElapsedSince(startTime) > timeoutMillis)
1613	+	//                 throw new AssertionError("timed out");
1614	+	//             Thread.yield();
1615	+	//         }
1616	+	//     }
1617	+
1618	+	public static class NPETask implements Callable<String> {
1619	+	public String call() { throw new NullPointerException(); }
1620	+	}
1621	+
1622	+	public Runnable possiblyInterruptedRunnable(final long timeoutMillis) {
1623	+	return new CheckedRunnable() {
1624	+	protected void realRun() {
1625	+	try {
1626	+	delay(timeoutMillis);
1627	+	} catch (InterruptedException ok) {}
1628	+	}};
1629		}
1630
1631		/**
1632		* For use as ThreadFactory in constructors
1633		*/
1634	<	static class SimpleThreadFactory implements ThreadFactory{
1635	<	public Thread newThread(Runnable r){
1634	>	public static class SimpleThreadFactory implements ThreadFactory {
1635	>	public Thread newThread(Runnable r) {
1636		return new Thread(r);
1637	<	}
1637	>	}
1638		}
1639
1640	<	static class TrackedShortRunnable implements Runnable {
1641	<	volatile boolean done = false;
1640	>	public interface TrackedRunnable extends Runnable {
1641	>	boolean isDone();
1642	>	}
1643	>
1644	>	public static class TrackedNoOpRunnable implements Runnable {
1645	>	public volatile boolean done = false;
1646		public void run() {
1647	+	done = true;
1648	+	}
1649	+	}
1650	+
1651	+	/**
1652	+	* Analog of CheckedRunnable for RecursiveAction
1653	+	*/
1654	+	public abstract class CheckedRecursiveAction extends RecursiveAction {
1655	+	protected abstract void realCompute() throws Throwable;
1656	+
1657	+	@Override protected final void compute() {
1658		try {
1659	<	Thread.sleep(SMALL_DELAY_MS);
1660	<	done = true;
1661	<	} catch(Exception e){
1659	>	realCompute();
1660	>	} catch (Throwable fail) {
1661	>	threadUnexpectedException(fail);
1662		}
1663		}
1664		}
1665
1666	<	static class TrackedMediumRunnable implements Runnable {
1667	<	volatile boolean done = false;
1668	<	public void run() {
1666	>	/**
1667	>	* Analog of CheckedCallable for RecursiveTask
1668	>	*/
1669	>	public abstract class CheckedRecursiveTask<T> extends RecursiveTask<T> {
1670	>	protected abstract T realCompute() throws Throwable;
1671	>
1672	>	@Override protected final T compute() {
1673		try {
1674	<	Thread.sleep(MEDIUM_DELAY_MS);
1675	<	done = true;
1676	<	} catch(Exception e){
1674	>	return realCompute();
1675	>	} catch (Throwable fail) {
1676	>	threadUnexpectedException(fail);
1677		}
1678	+	throw new AssertionError("unreached");
1679		}
1680		}
1681
1682	<	static class TrackedLongRunnable implements Runnable {
1683	<	volatile boolean done = false;
1684	<	public void run() {
1682	>	/**
1683	>	* For use as RejectedExecutionHandler in constructors
1684	>	*/
1685	>	public static class NoOpREHandler implements RejectedExecutionHandler {
1686	>	public void rejectedExecution(Runnable r,
1687	>	ThreadPoolExecutor executor) {}
1688	>	}
1689	>
1690	>	/**
1691	>	* A CyclicBarrier that uses timed await and fails with
1692	>	* AssertionErrors instead of throwing checked exceptions.
1693	>	*/
1694	>	public static class CheckedBarrier extends CyclicBarrier {
1695	>	public CheckedBarrier(int parties) { super(parties); }
1696	>
1697	>	public int await() {
1698		try {
1699	<	Thread.sleep(LONG_DELAY_MS);
1700	<	done = true;
1701	<	} catch(Exception e){
1699	>	return super.await(2 * LONG_DELAY_MS, MILLISECONDS);
1700	>	} catch (TimeoutException timedOut) {
1701	>	throw new AssertionError("timed out");
1702	>	} catch (Exception fail) {
1703	>	throw new AssertionError("Unexpected exception: " + fail, fail);
1704		}
1705		}
1706		}
1707
1708	<	static class TrackedNoOpRunnable implements Runnable {
1709	<	volatile boolean done = false;
1710	<	public void run() {
1711	<	done = true;
1708	>	void checkEmpty(BlockingQueue q) {
1709	>	try {
1710	>	assertTrue(q.isEmpty());
1711	>	assertEquals(0, q.size());
1712	>	assertNull(q.peek());
1713	>	assertNull(q.poll());
1714	>	assertNull(q.poll(randomExpiredTimeout(), randomTimeUnit()));
1715	>	assertEquals(q.toString(), "[]");
1716	>	assertTrue(Arrays.equals(q.toArray(), new Object[0]));
1717	>	assertFalse(q.iterator().hasNext());
1718	>	try {
1719	>	q.element();
1720	>	shouldThrow();
1721	>	} catch (NoSuchElementException success) {}
1722	>	try {
1723	>	q.iterator().next();
1724	>	shouldThrow();
1725	>	} catch (NoSuchElementException success) {}
1726	>	try {
1727	>	q.remove();
1728	>	shouldThrow();
1729	>	} catch (NoSuchElementException success) {}
1730	>	} catch (InterruptedException fail) { threadUnexpectedException(fail); }
1731	>	}
1732	>
1733	>	void assertSerialEquals(Object x, Object y) {
1734	>	assertTrue(Arrays.equals(serialBytes(x), serialBytes(y)));
1735	>	}
1736	>
1737	>	void assertNotSerialEquals(Object x, Object y) {
1738	>	assertFalse(Arrays.equals(serialBytes(x), serialBytes(y)));
1739	>	}
1740	>
1741	>	byte[] serialBytes(Object o) {
1742	>	try {
1743	>	ByteArrayOutputStream bos = new ByteArrayOutputStream();
1744	>	ObjectOutputStream oos = new ObjectOutputStream(bos);
1745	>	oos.writeObject(o);
1746	>	oos.flush();
1747	>	oos.close();
1748	>	return bos.toByteArray();
1749	>	} catch (Throwable fail) {
1750	>	threadUnexpectedException(fail);
1751	>	return new byte[0];
1752	>	}
1753	>	}
1754	>
1755	>	void assertImmutable(Object o) {
1756	>	if (o instanceof Collection) {
1757	>	assertThrows(
1758	>	UnsupportedOperationException.class,
1759	>	() -> ((Collection) o).add(null));
1760	>	}
1761	>	}
1762	>
1763	>	@SuppressWarnings("unchecked")
1764	>	<T> T serialClone(T o) {
1765	>	T clone = null;
1766	>	try {
1767	>	ObjectInputStream ois = new ObjectInputStream
1768	>	(new ByteArrayInputStream(serialBytes(o)));
1769	>	clone = (T) ois.readObject();
1770	>	} catch (Throwable fail) {
1771	>	threadUnexpectedException(fail);
1772		}
1773	+	if (o == clone) assertImmutable(o);
1774	+	else assertSame(o.getClass(), clone.getClass());
1775	+	return clone;
1776		}
1777
1778	<	static class TrackedCallable implements Callable {
1779	<	volatile boolean done = false;
1780	<	public Object call() {
1781	<	try {
1782	<	Thread.sleep(SMALL_DELAY_MS);
1783	<	done = true;
1784	<	} catch(Exception e){
1778	>	/**
1779	>	* A version of serialClone that leaves error handling (for
1780	>	* e.g. NotSerializableException) up to the caller.
1781	>	*/
1782	>	@SuppressWarnings("unchecked")
1783	>	<T> T serialClonePossiblyFailing(T o)
1784	>	throws ReflectiveOperationException, java.io.IOException {
1785	>	ByteArrayOutputStream bos = new ByteArrayOutputStream();
1786	>	ObjectOutputStream oos = new ObjectOutputStream(bos);
1787	>	oos.writeObject(o);
1788	>	oos.flush();
1789	>	oos.close();
1790	>	ObjectInputStream ois = new ObjectInputStream
1791	>	(new ByteArrayInputStream(bos.toByteArray()));
1792	>	T clone = (T) ois.readObject();
1793	>	if (o == clone) assertImmutable(o);
1794	>	else assertSame(o.getClass(), clone.getClass());
1795	>	return clone;
1796	>	}
1797	>
1798	>	/**
1799	>	* If o implements Cloneable and has a public clone method,
1800	>	* returns a clone of o, else null.
1801	>	*/
1802	>	@SuppressWarnings("unchecked")
1803	>	<T> T cloneableClone(T o) {
1804	>	if (!(o instanceof Cloneable)) return null;
1805	>	final T clone;
1806	>	try {
1807	>	clone = (T) o.getClass().getMethod("clone").invoke(o);
1808	>	} catch (NoSuchMethodException ok) {
1809	>	return null;
1810	>	} catch (ReflectiveOperationException unexpected) {
1811	>	throw new Error(unexpected);
1812	>	}
1813	>	assertNotSame(o, clone); // not 100% guaranteed by spec
1814	>	assertSame(o.getClass(), clone.getClass());
1815	>	return clone;
1816	>	}
1817	>
1818	>	public void assertThrows(Class<? extends Throwable> expectedExceptionClass,
1819	>	Action... throwingActions) {
1820	>	for (Action throwingAction : throwingActions) {
1821	>	boolean threw = false;
1822	>	try { throwingAction.run(); }
1823	>	catch (Throwable t) {
1824	>	threw = true;
1825	>	if (!expectedExceptionClass.isInstance(t))
1826	>	throw new AssertionError(
1827	>	"Expected " + expectedExceptionClass.getName() +
1828	>	", got " + t.getClass().getName(),
1829	>	t);
1830		}
1831	<	return Boolean.TRUE;
1831	>	if (!threw)
1832	>	shouldThrow(expectedExceptionClass.getName());
1833		}
1834		}
1835
1836	+	public void assertIteratorExhausted(Iterator<?> it) {
1837	+	try {
1838	+	it.next();
1839	+	shouldThrow();
1840	+	} catch (NoSuchElementException success) {}
1841	+	assertFalse(it.hasNext());
1842	+	}
1843	+
1844	+	public <T> Callable<T> callableThrowing(final Exception ex) {
1845	+	return new Callable<T>() { public T call() throws Exception { throw ex; }};
1846	+	}
1847	+
1848	+	public Runnable runnableThrowing(final RuntimeException ex) {
1849	+	return new Runnable() { public void run() { throw ex; }};
1850	+	}
1851	+
1852	+	/** A reusable thread pool to be shared by tests. */
1853	+	static final ExecutorService cachedThreadPool =
1854	+	new ThreadPoolExecutor(0, Integer.MAX_VALUE,
1855	+	1000L, MILLISECONDS,
1856	+	new SynchronousQueue<Runnable>());
1857	+
1858	+	static <T> void shuffle(T[] array) {
1859	+	Collections.shuffle(Arrays.asList(array), ThreadLocalRandom.current());
1860	+	}
1861	+
1862		/**
1863	<	* For use as RejectedExecutionHandler in constructors
1863	>	* Returns the same String as would be returned by {@link
1864	>	* Object#toString}, whether or not the given object's class
1865	>	* overrides toString().
1866	>	*
1867	>	* @see System#identityHashCode
1868		*/
1869	<	static class NoOpREHandler implements RejectedExecutionHandler{
1870	<	public void rejectedExecution(Runnable r, ThreadPoolExecutor executor){}
1869	>	static String identityString(Object x) {
1870	>	return x.getClass().getName()
1871	>	+ "@" + Integer.toHexString(System.identityHashCode(x));
1872	>	}
1873	>
1874	>	// --- Shared assertions for Executor tests ---
1875	>
1876	>	/**
1877	>	* Returns maximum number of tasks that can be submitted to given
1878	>	* pool (with bounded queue) before saturation (when submission
1879	>	* throws RejectedExecutionException).
1880	>	*/
1881	>	static final int saturatedSize(ThreadPoolExecutor pool) {
1882	>	BlockingQueue<Runnable> q = pool.getQueue();
1883	>	return pool.getMaximumPoolSize() + q.size() + q.remainingCapacity();
1884	>	}
1885	>
1886	>	@SuppressWarnings("FutureReturnValueIgnored")
1887	>	void assertNullTaskSubmissionThrowsNullPointerException(Executor e) {
1888	>	try {
1889	>	e.execute((Runnable) null);
1890	>	shouldThrow();
1891	>	} catch (NullPointerException success) {}
1892	>
1893	>	if (! (e instanceof ExecutorService)) return;
1894	>	ExecutorService es = (ExecutorService) e;
1895	>	try {
1896	>	es.submit((Runnable) null);
1897	>	shouldThrow();
1898	>	} catch (NullPointerException success) {}
1899	>	try {
1900	>	es.submit((Runnable) null, Boolean.TRUE);
1901	>	shouldThrow();
1902	>	} catch (NullPointerException success) {}
1903	>	try {
1904	>	es.submit((Callable) null);
1905	>	shouldThrow();
1906	>	} catch (NullPointerException success) {}
1907	>
1908	>	if (! (e instanceof ScheduledExecutorService)) return;
1909	>	ScheduledExecutorService ses = (ScheduledExecutorService) e;
1910	>	try {
1911	>	ses.schedule((Runnable) null,
1912	>	randomTimeout(), randomTimeUnit());
1913	>	shouldThrow();
1914	>	} catch (NullPointerException success) {}
1915	>	try {
1916	>	ses.schedule((Callable) null,
1917	>	randomTimeout(), randomTimeUnit());
1918	>	shouldThrow();
1919	>	} catch (NullPointerException success) {}
1920	>	try {
1921	>	ses.scheduleAtFixedRate((Runnable) null,
1922	>	randomTimeout(), LONG_DELAY_MS, MILLISECONDS);
1923	>	shouldThrow();
1924	>	} catch (NullPointerException success) {}
1925	>	try {
1926	>	ses.scheduleWithFixedDelay((Runnable) null,
1927	>	randomTimeout(), LONG_DELAY_MS, MILLISECONDS);
1928	>	shouldThrow();
1929	>	} catch (NullPointerException success) {}
1930	>	}
1931	>
1932	>	void setRejectedExecutionHandler(
1933	>	ThreadPoolExecutor p, RejectedExecutionHandler handler) {
1934	>	p.setRejectedExecutionHandler(handler);
1935	>	assertSame(handler, p.getRejectedExecutionHandler());
1936	>	}
1937	>
1938	>	void assertTaskSubmissionsAreRejected(ThreadPoolExecutor p) {
1939	>	final RejectedExecutionHandler savedHandler = p.getRejectedExecutionHandler();
1940	>	final long savedTaskCount = p.getTaskCount();
1941	>	final long savedCompletedTaskCount = p.getCompletedTaskCount();
1942	>	final int savedQueueSize = p.getQueue().size();
1943	>	final boolean stock = (p.getClass().getClassLoader() == null);
1944	>
1945	>	Runnable r = () -> {};
1946	>	Callable<Boolean> c = () -> Boolean.TRUE;
1947	>
1948	>	class Recorder implements RejectedExecutionHandler {
1949	>	public volatile Runnable r = null;
1950	>	public volatile ThreadPoolExecutor p = null;
1951	>	public void reset() { r = null; p = null; }
1952	>	public void rejectedExecution(Runnable r, ThreadPoolExecutor p) {
1953	>	assertNull(this.r);
1954	>	assertNull(this.p);
1955	>	this.r = r;
1956	>	this.p = p;
1957	>	}
1958	>	}
1959	>
1960	>	// check custom handler is invoked exactly once per task
1961	>	Recorder recorder = new Recorder();
1962	>	setRejectedExecutionHandler(p, recorder);
1963	>	for (int i = 2; i--> 0; ) {
1964	>	recorder.reset();
1965	>	p.execute(r);
1966	>	if (stock && p.getClass() == ThreadPoolExecutor.class)
1967	>	assertSame(r, recorder.r);
1968	>	assertSame(p, recorder.p);
1969	>
1970	>	recorder.reset();
1971	>	assertFalse(p.submit(r).isDone());
1972	>	if (stock) assertTrue(!((FutureTask) recorder.r).isDone());
1973	>	assertSame(p, recorder.p);
1974	>
1975	>	recorder.reset();
1976	>	assertFalse(p.submit(r, Boolean.TRUE).isDone());
1977	>	if (stock) assertTrue(!((FutureTask) recorder.r).isDone());
1978	>	assertSame(p, recorder.p);
1979	>
1980	>	recorder.reset();
1981	>	assertFalse(p.submit(c).isDone());
1982	>	if (stock) assertTrue(!((FutureTask) recorder.r).isDone());
1983	>	assertSame(p, recorder.p);
1984	>
1985	>	if (p instanceof ScheduledExecutorService) {
1986	>	ScheduledExecutorService s = (ScheduledExecutorService) p;
1987	>	ScheduledFuture<?> future;
1988	>
1989	>	recorder.reset();
1990	>	future = s.schedule(r, randomTimeout(), randomTimeUnit());
1991	>	assertFalse(future.isDone());
1992	>	if (stock) assertTrue(!((FutureTask) recorder.r).isDone());
1993	>	assertSame(p, recorder.p);
1994	>
1995	>	recorder.reset();
1996	>	future = s.schedule(c, randomTimeout(), randomTimeUnit());
1997	>	assertFalse(future.isDone());
1998	>	if (stock) assertTrue(!((FutureTask) recorder.r).isDone());
1999	>	assertSame(p, recorder.p);
2000	>
2001	>	recorder.reset();
2002	>	future = s.scheduleAtFixedRate(r, randomTimeout(), LONG_DELAY_MS, MILLISECONDS);
2003	>	assertFalse(future.isDone());
2004	>	if (stock) assertTrue(!((FutureTask) recorder.r).isDone());
2005	>	assertSame(p, recorder.p);
2006	>
2007	>	recorder.reset();
2008	>	future = s.scheduleWithFixedDelay(r, randomTimeout(), LONG_DELAY_MS, MILLISECONDS);
2009	>	assertFalse(future.isDone());
2010	>	if (stock) assertTrue(!((FutureTask) recorder.r).isDone());
2011	>	assertSame(p, recorder.p);
2012	>	}
2013	>	}
2014	>
2015	>	// Checking our custom handler above should be sufficient, but
2016	>	// we add some integration tests of standard handlers.
2017	>	final AtomicReference<Thread> thread = new AtomicReference<>();
2018	>	final Runnable setThread = () -> thread.set(Thread.currentThread());
2019	>
2020	>	setRejectedExecutionHandler(p, new ThreadPoolExecutor.AbortPolicy());
2021	>	try {
2022	>	p.execute(setThread);
2023	>	shouldThrow();
2024	>	} catch (RejectedExecutionException success) {}
2025	>	assertNull(thread.get());
2026	>
2027	>	setRejectedExecutionHandler(p, new ThreadPoolExecutor.DiscardPolicy());
2028	>	p.execute(setThread);
2029	>	assertNull(thread.get());
2030	>
2031	>	setRejectedExecutionHandler(p, new ThreadPoolExecutor.CallerRunsPolicy());
2032	>	p.execute(setThread);
2033	>	if (p.isShutdown())
2034	>	assertNull(thread.get());
2035	>	else
2036	>	assertSame(Thread.currentThread(), thread.get());
2037	>
2038	>	setRejectedExecutionHandler(p, savedHandler);
2039	>
2040	>	// check that pool was not perturbed by handlers
2041	>	assertEquals(savedTaskCount, p.getTaskCount());
2042	>	assertEquals(savedCompletedTaskCount, p.getCompletedTaskCount());
2043	>	assertEquals(savedQueueSize, p.getQueue().size());
2044	>	}
2045	>
2046	>	void assertCollectionsEquals(Collection<?> x, Collection<?> y) {
2047	>	assertEquals(x, y);
2048	>	assertEquals(y, x);
2049	>	assertEquals(x.isEmpty(), y.isEmpty());
2050	>	assertEquals(x.size(), y.size());
2051	>	if (x instanceof List) {
2052	>	assertEquals(x.toString(), y.toString());
2053	>	}
2054	>	if (x instanceof List || x instanceof Set) {
2055	>	assertEquals(x.hashCode(), y.hashCode());
2056	>	}
2057	>	if (x instanceof List || x instanceof Deque) {
2058	>	assertTrue(Arrays.equals(x.toArray(), y.toArray()));
2059	>	assertTrue(Arrays.equals(x.toArray(new Object[0]),
2060	>	y.toArray(new Object[0])));
2061	>	}
2062	>	}
2063	>
2064	>	/**
2065	>	* A weaker form of assertCollectionsEquals which does not insist
2066	>	* that the two collections satisfy Object#equals(Object), since
2067	>	* they may use identity semantics as Deques do.
2068	>	*/
2069	>	void assertCollectionsEquivalent(Collection<?> x, Collection<?> y) {
2070	>	if (x instanceof List || x instanceof Set)
2071	>	assertCollectionsEquals(x, y);
2072	>	else {
2073	>	assertEquals(x.isEmpty(), y.isEmpty());
2074	>	assertEquals(x.size(), y.size());
2075	>	assertEquals(new HashSet(x), new HashSet(y));
2076	>	if (x instanceof Deque) {
2077	>	assertTrue(Arrays.equals(x.toArray(), y.toArray()));
2078	>	assertTrue(Arrays.equals(x.toArray(new Object[0]),
2079	>	y.toArray(new Object[0])));
2080	>	}
2081	>	}
2082		}
500	–
501	–
2083		}

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