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

Comparing jsr166/src/test/tck/FutureTaskTest.java (file contents):
Revision 1.29 by jsr166, Mon Jun 20 04:31:59 2011 UTC vs.
Revision 1.57 by dl, Tue Jan 26 13:33:06 2021 UTC

#	Line 6 | Line 6
6		* Pat Fisher, Mike Judd.
7		*/
8
9	<	import junit.framework.*;
9	>	import static java.util.concurrent.TimeUnit.MILLISECONDS;
10	>	import static java.util.concurrent.TimeUnit.NANOSECONDS;
11	>
12	>	import java.util.ArrayList;
13	>	import java.util.List;
14	>	import java.util.NoSuchElementException;
15		import java.util.concurrent.Callable;
16		import java.util.concurrent.CancellationException;
17		import java.util.concurrent.CountDownLatch;
18		import java.util.concurrent.ExecutionException;
19	+	import java.util.concurrent.Executors;
20	+	import java.util.concurrent.ExecutorService;
21		import java.util.concurrent.Future;
22		import java.util.concurrent.FutureTask;
23		import java.util.concurrent.TimeoutException;
24		import java.util.concurrent.atomic.AtomicInteger;
25	<	import static java.util.concurrent.TimeUnit.MILLISECONDS;
26	<	import static java.util.concurrent.TimeUnit.SECONDS;
27	<	import java.util.*;
25	>
26	>	import junit.framework.Test;
27	>	import junit.framework.TestSuite;
28
29		public class FutureTaskTest extends JSR166TestCase {
30
31		public static void main(String[] args) {
32	<	junit.textui.TestRunner.run(suite());
32	>	main(suite(), args);
33		}
34		public static Test suite() {
35		return new TestSuite(FutureTaskTest.class);
#	Line 37 | Line 44 | public class FutureTaskTest extends JSR1
44		assertEquals(1, pf.doneCount());
45		assertFalse(pf.runAndReset());
46		assertEquals(1, pf.doneCount());
47	+	Object r = null; Object exInfo = null;
48	+	try {
49	+	r = f.get();
50	+	} catch (CancellationException t) {
51	+	exInfo = CancellationException.class;
52	+	} catch (ExecutionException t) {
53	+	exInfo = t.getCause();
54	+	} catch (Throwable t) {
55	+	threadUnexpectedException(t);
56	+	}
57
58		// Check that run and runAndReset have no effect.
59		int savedRunCount = pf.runCount();
43	–	int savedSetCount = pf.setCount();
44	–	int savedSetExceptionCount = pf.setExceptionCount();
60		pf.run();
61		pf.runAndReset();
62		assertEquals(savedRunCount, pf.runCount());
63	<	assertEquals(savedSetCount, pf.setCount());
64	<	assertEquals(savedSetExceptionCount, pf.setExceptionCount());
63	>	Object r2 = null;
64	>	try {
65	>	r2 = f.get();
66	>	} catch (CancellationException t) {
67	>	assertSame(exInfo, CancellationException.class);
68	>	} catch (ExecutionException t) {
69	>	assertSame(exInfo, t.getCause());
70	>	} catch (Throwable t) {
71	>	threadUnexpectedException(t);
72	>	}
73	>	if (exInfo == null)
74	>	assertSame(r, r2);
75		assertTrue(f.isDone());
76		}
77		}
#	Line 65 | Line 90 | public class FutureTaskTest extends JSR1
90		void checkIsRunning(Future<?> f) {
91		checkNotDone(f);
92		if (f instanceof FutureTask) {
93	<	FutureTask ft = (FutureTask<?>) f;
93	>	FutureTask<?> ft = (FutureTask<?>) f;
94		// Check that run methods do nothing
95		ft.run();
96	<	if (f instanceof PublicFutureTask)
97	<	assertFalse(((PublicFutureTask) f).runAndReset());
96	>	if (f instanceof PublicFutureTask) {
97	>	PublicFutureTask pf = (PublicFutureTask) f;
98	>	int savedRunCount = pf.runCount();
99	>	pf.run();
100	>	assertFalse(pf.runAndReset());
101	>	assertEquals(savedRunCount, pf.runCount());
102	>	}
103		checkNotDone(f);
104		}
105		}
106
107	<	<T> void checkCompletedNormally(Future<T> f, T expected) {
107	>	<T> void checkCompletedNormally(Future<T> f, T expectedValue) {
108		checkIsDone(f);
109		assertFalse(f.isCancelled());
110
111	+	T v1 = null, v2 = null;
112		try {
113	<	assertSame(expected, f.get());
114	<	} catch (Throwable fail) { threadUnexpectedException(fail); }
84	<	try {
85	<	assertSame(expected, f.get(5L, SECONDS));
113	>	v1 = f.get();
114	>	v2 = f.get(randomTimeout(), randomTimeUnit());
115		} catch (Throwable fail) { threadUnexpectedException(fail); }
116	+	assertSame(expectedValue, v1);
117	+	assertSame(expectedValue, v2);
118		}
119
120		void checkCancelled(Future<?> f) {
#	Line 97 | Line 128 | public class FutureTaskTest extends JSR1
128		} catch (Throwable fail) { threadUnexpectedException(fail); }
129
130		try {
131	<	f.get(5L, SECONDS);
131	>	f.get(randomTimeout(), randomTimeUnit());
132		shouldThrow();
133		} catch (CancellationException success) {
134		} catch (Throwable fail) { threadUnexpectedException(fail); }
#	Line 107 | Line 138 | public class FutureTaskTest extends JSR1
138		pf.set(new Object());
139		pf.setException(new Error());
140		for (boolean mayInterruptIfRunning : new boolean[] { true, false }) {
141	<	pf.cancel(true);
141	>	pf.cancel(mayInterruptIfRunning);
142		}
143		}
144
#	Line 123 | Line 154 | public class FutureTaskTest extends JSR1
154		} catch (Throwable fail) { threadUnexpectedException(fail); }
155
156		try {
157	<	f.get(5L, SECONDS);
157	>	f.get(randomTimeout(), randomTimeUnit());
158		shouldThrow();
159		} catch (ExecutionException success) {
160		assertSame(t, success.getCause());
#	Line 133 | Line 164 | public class FutureTaskTest extends JSR1
164		/**
165		* Subclass to expose protected methods
166		*/
167	<	static class PublicFutureTask extends FutureTask {
167	>	static class PublicFutureTask extends FutureTask<Object> {
168		private final AtomicInteger runCount;
169		private final AtomicInteger doneCount = new AtomicInteger(0);
170		private final AtomicInteger runAndResetCount = new AtomicInteger(0);
#	Line 154 | Line 185 | public class FutureTaskTest extends JSR1
185		private PublicFutureTask(final Runnable runnable, Object result,
186		final AtomicInteger runCount) {
187		super(new Runnable() {
188	<	public void run() {
189	<	runCount.getAndIncrement();
190	<	runnable.run();
191	<	}}, result);
188	>	public void run() {
189	>	runCount.getAndIncrement();
190	>	runnable.run();
191	>	}}, result);
192		this.runCount = runCount;
193		}
194	<	PublicFutureTask(Callable callable) {
194	>	PublicFutureTask(Callable<?> callable) {
195		this(callable, new AtomicInteger(0));
196		}
197	<	private PublicFutureTask(final Callable callable,
197	>	private PublicFutureTask(final Callable<?> callable,
198		final AtomicInteger runCount) {
199	<	super(new Callable() {
199	>	super(new Callable<Object>() {
200		public Object call() throws Exception {
201		runCount.getAndIncrement();
202		return callable.call();
203		}});
204		this.runCount = runCount;
205		}
206	<	public void done() {
206	>	@Override public void done() {
207		assertTrue(isDone());
208		doneCount.incrementAndGet();
209		super.done();
210		}
211	<	public boolean runAndReset() {
211	>	@Override public boolean runAndReset() {
212		runAndResetCount.incrementAndGet();
213		return super.runAndReset();
214		}
215	<	public void set(Object x) {
215	>	@Override public void set(Object x) {
216		setCount.incrementAndGet();
217		super.set(x);
218		}
219	<	public void setException(Throwable t) {
219	>	@Override public void setException(Throwable t) {
220		setExceptionCount.incrementAndGet();
221		super.setException(t);
222		}
#	Line 204 | Line 235 | public class FutureTaskTest extends JSR1
235		*/
236		public void testConstructor() {
237		try {
238	<	new FutureTask(null);
238	>	new FutureTask<Void>(null);
239		shouldThrow();
240		} catch (NullPointerException success) {}
241		}
#	Line 214 | Line 245 | public class FutureTaskTest extends JSR1
245		*/
246		public void testConstructor2() {
247		try {
248	<	new FutureTask(null, Boolean.TRUE);
248	>	new FutureTask<Boolean>(null, Boolean.TRUE);
249		shouldThrow();
250		} catch (NullPointerException success) {}
251		}
#	Line 239 | Line 270 | public class FutureTaskTest extends JSR1
270		for (int i = 0; i < 3; i++) {
271		assertTrue(task.runAndReset());
272		checkNotDone(task);
273	<	assertEquals(i+1, task.runCount());
274	<	assertEquals(i+1, task.runAndResetCount());
273	>	assertEquals(i + 1, task.runCount());
274	>	assertEquals(i + 1, task.runAndResetCount());
275		assertEquals(0, task.setCount());
276		assertEquals(0, task.setExceptionCount());
277		}
#	Line 256 | Line 287 | public class FutureTaskTest extends JSR1
287		for (int i = 0; i < 3; i++) {
288		assertFalse(task.runAndReset());
289		assertEquals(0, task.runCount());
290	<	assertEquals(i+1, task.runAndResetCount());
290	>	assertEquals(i + 1, task.runAndResetCount());
291		assertEquals(0, task.setCount());
292		assertEquals(0, task.setExceptionCount());
293		}
#	Line 319 | Line 350 | public class FutureTaskTest extends JSR1
350		PublicFutureTask task = new PublicFutureTask(new NoOpCallable());
351		assertTrue(task.cancel(false));
352		task.run();
353	+	assertEquals(0, task.runCount());
354		assertEquals(0, task.setCount());
355		assertEquals(0, task.setExceptionCount());
356	+	assertTrue(task.isCancelled());
357	+	assertTrue(task.isDone());
358		tryToConfuseDoneTask(task);
325	–	checkCancelled(task);
359		assertEquals(0, task.runCount());
360	+	checkCancelled(task);
361		}
362
363		/**
#	Line 333 | Line 367 | public class FutureTaskTest extends JSR1
367		PublicFutureTask task = new PublicFutureTask(new NoOpCallable());
368		assertTrue(task.cancel(true));
369		task.run();
370	+	assertEquals(0, task.runCount());
371		assertEquals(0, task.setCount());
372		assertEquals(0, task.setExceptionCount());
373	+	assertTrue(task.isCancelled());
374	+	assertTrue(task.isDone());
375		tryToConfuseDoneTask(task);
339	–	checkCancelled(task);
376		assertEquals(0, task.runCount());
377	+	checkCancelled(task);
378		}
379
380		/**
#	Line 347 | Line 384 | public class FutureTaskTest extends JSR1
384		PublicFutureTask task = new PublicFutureTask(new NoOpCallable());
385		task.run();
386		assertFalse(task.cancel(false));
387	+	assertEquals(1, task.runCount());
388		assertEquals(1, task.setCount());
389		assertEquals(0, task.setExceptionCount());
390		tryToConfuseDoneTask(task);
#	Line 361 | Line 399 | public class FutureTaskTest extends JSR1
399		PublicFutureTask task = new PublicFutureTask(new NoOpCallable());
400		task.run();
401		assertFalse(task.cancel(true));
402	+	assertEquals(1, task.runCount());
403		assertEquals(1, task.setCount());
404		assertEquals(0, task.setExceptionCount());
405		tryToConfuseDoneTask(task);
#	Line 381 | Line 420 | public class FutureTaskTest extends JSR1
420		delay(LONG_DELAY_MS);
421		shouldThrow();
422		} catch (InterruptedException success) {}
423	+	assertFalse(Thread.interrupted());
424		}});
425
426		Thread t = newStartedThread(task);
427		await(pleaseCancel);
428		assertTrue(task.cancel(true));
429		assertTrue(task.isCancelled());
430	+	assertTrue(task.isDone());
431		awaitTermination(t);
432		assertEquals(1, task.runCount());
433		assertEquals(1, task.setCount());
#	Line 396 | Line 437 | public class FutureTaskTest extends JSR1
437		}
438
439		/**
440	+	* cancel(true) tries to interrupt a running task, but
441	+	* Thread.interrupt throws (simulating a restrictive security
442	+	* manager)
443	+	*/
444	+	public void testCancelInterrupt_ThrowsSecurityException() {
445	+	final CountDownLatch pleaseCancel = new CountDownLatch(1);
446	+	final CountDownLatch cancelled = new CountDownLatch(1);
447	+	final PublicFutureTask task =
448	+	new PublicFutureTask(new CheckedRunnable() {
449	+	public void realRun() {
450	+	pleaseCancel.countDown();
451	+	await(cancelled);
452	+	assertFalse(Thread.interrupted());
453	+	}});
454	+
455	+	final Thread t = new Thread(task) {
456	+	// Simulate a restrictive security manager.
457	+	@Override public void interrupt() {
458	+	throw new SecurityException();
459	+	}};
460	+	t.setDaemon(true);
461	+	t.start();
462	+
463	+	await(pleaseCancel);
464	+	try {
465	+	task.cancel(true);
466	+	shouldThrow();
467	+	} catch (SecurityException success) {}
468	+
469	+	// We failed to deliver the interrupt, but the world retains
470	+	// its sanity, as if we had done task.cancel(false)
471	+	assertTrue(task.isCancelled());
472	+	assertTrue(task.isDone());
473	+	assertEquals(1, task.runCount());
474	+	assertEquals(1, task.doneCount());
475	+	assertEquals(0, task.setCount());
476	+	assertEquals(0, task.setExceptionCount());
477	+	cancelled.countDown();
478	+	awaitTermination(t);
479	+	assertEquals(1, task.setCount());
480	+	assertEquals(0, task.setExceptionCount());
481	+	tryToConfuseDoneTask(task);
482	+	checkCancelled(task);
483	+	}
484	+
485	+	/**
486		* cancel(true) interrupts a running task that subsequently throws
487		*/
488		public void testCancelInterrupt_taskFails() {
#	Line 403 | Line 490 | public class FutureTaskTest extends JSR1
490		final PublicFutureTask task =
491		new PublicFutureTask(new Runnable() {
492		public void run() {
493	+	pleaseCancel.countDown();
494		try {
407	–	pleaseCancel.countDown();
495		delay(LONG_DELAY_MS);
496	<	} finally { throw new RuntimeException(); }
496	>	threadShouldThrow();
497	>	} catch (InterruptedException success) {
498	>	} catch (Throwable t) { threadUnexpectedException(t); }
499	>	throw new RuntimeException();
500		}});
501
502		Thread t = newStartedThread(task);
#	Line 531 | Line 621 | public class FutureTaskTest extends JSR1
621		* CancellationException
622		*/
623		public void testTimedGet_Cancellation() {
624	<	for (final boolean mayInterruptIfRunning :
625	<	new boolean[] { true, false }) {
626	<	final CountDownLatch pleaseCancel = new CountDownLatch(3);
627	<	final CountDownLatch cancelled = new CountDownLatch(1);
628	<	final PublicFutureTask task =
629	<	new PublicFutureTask(new CheckedCallable<Object>() {
630	<	public Object realCall() throws InterruptedException {
631	<	pleaseCancel.countDown();
632	<	if (mayInterruptIfRunning) {
633	<	try {
634	<	delay(2*LONG_DELAY_MS);
635	<	} catch (InterruptedException success) {}
636	<	} else {
637	<	await(cancelled);
638	<	}
639	<	return two;
640	<	}});
624	>	testTimedGet_Cancellation(false);
625	>	}
626	>	public void testTimedGet_Cancellation_interrupt() {
627	>	testTimedGet_Cancellation(true);
628	>	}
629	>	public void testTimedGet_Cancellation(final boolean mayInterruptIfRunning) {
630	>	final CountDownLatch pleaseCancel = new CountDownLatch(3);
631	>	final CountDownLatch cancelled = new CountDownLatch(1);
632	>	final Callable<Object> callable =
633	>	new CheckedCallable<Object>() {
634	>	public Object realCall() throws InterruptedException {
635	>	pleaseCancel.countDown();
636	>	if (mayInterruptIfRunning) {
637	>	try {
638	>	delay(2*LONG_DELAY_MS);
639	>	} catch (InterruptedException success) {}
640	>	} else {
641	>	await(cancelled);
642	>	}
643	>	return two;
644	>	}};
645	>	final PublicFutureTask task = new PublicFutureTask(callable);
646
647	<	Thread t1 = new ThreadShouldThrow(CancellationException.class) {
647	>	Thread t1 = new ThreadShouldThrow(CancellationException.class) {
648		public void realRun() throws Exception {
649		pleaseCancel.countDown();
650		task.get();
651		}};
652	<	Thread t2 = new ThreadShouldThrow(CancellationException.class) {
652	>	Thread t2 = new ThreadShouldThrow(CancellationException.class) {
653		public void realRun() throws Exception {
654		pleaseCancel.countDown();
655		task.get(2*LONG_DELAY_MS, MILLISECONDS);
656		}};
657	<	t1.start();
658	<	t2.start();
659	<	Thread t3 = newStartedThread(task);
660	<	await(pleaseCancel);
661	<	checkIsRunning(task);
662	<	task.cancel(mayInterruptIfRunning);
663	<	checkCancelled(task);
664	<	awaitTermination(t1);
665	<	awaitTermination(t2);
666	<	cancelled.countDown();
667	<	awaitTermination(t3);
668	<	assertEquals(1, task.runCount());
669	<	assertEquals(1, task.setCount());
670	<	assertEquals(0, task.setExceptionCount());
671	<	tryToConfuseDoneTask(task);
672	<	checkCancelled(task);
578	<	}
657	>	t1.start();
658	>	t2.start();
659	>	Thread t3 = newStartedThread(task);
660	>	await(pleaseCancel);
661	>	checkIsRunning(task);
662	>	task.cancel(mayInterruptIfRunning);
663	>	checkCancelled(task);
664	>	awaitTermination(t1);
665	>	awaitTermination(t2);
666	>	cancelled.countDown();
667	>	awaitTermination(t3);
668	>	assertEquals(1, task.runCount());
669	>	assertEquals(1, task.setCount());
670	>	assertEquals(0, task.setExceptionCount());
671	>	tryToConfuseDoneTask(task);
672	>	checkCancelled(task);
673		}
674
675		/**
#	Line 583 | Line 677 | public class FutureTaskTest extends JSR1
677		*/
678		public void testGet_ExecutionException() throws InterruptedException {
679		final ArithmeticException e = new ArithmeticException();
680	<	final PublicFutureTask task = new PublicFutureTask(new Callable() {
680	>	final PublicFutureTask task = new PublicFutureTask(new Callable<Object>() {
681		public Object call() {
682		throw e;
683		}});
#	Line 607 | Line 701 | public class FutureTaskTest extends JSR1
701		*/
702		public void testTimedGet_ExecutionException2() throws Exception {
703		final ArithmeticException e = new ArithmeticException();
704	<	final PublicFutureTask task = new PublicFutureTask(new Callable() {
704	>	final PublicFutureTask task = new PublicFutureTask(new Callable<Object>() {
705		public Object call() {
706		throw e;
707		}});
#	Line 626 | Line 720 | public class FutureTaskTest extends JSR1
720		/**
721		* get is interruptible
722		*/
723	<	public void testGet_interruptible() {
723	>	public void testGet_Interruptible() {
724		final CountDownLatch pleaseInterrupt = new CountDownLatch(1);
725	<	final FutureTask task = new FutureTask(new NoOpCallable());
725	>	final FutureTask<Object> task = new FutureTask<Object>(new NoOpCallable());
726		Thread t = newStartedThread(new CheckedRunnable() {
727		public void realRun() throws Exception {
728		Thread.currentThread().interrupt();
#	Line 655 | Line 749 | public class FutureTaskTest extends JSR1
749		/**
750		* timed get is interruptible
751		*/
752	<	public void testTimedGet_interruptible() {
752	>	public void testTimedGet_Interruptible() {
753		final CountDownLatch pleaseInterrupt = new CountDownLatch(1);
754	<	final FutureTask task = new FutureTask(new NoOpCallable());
754	>	final FutureTask<Object> task = new FutureTask<Object>(new NoOpCallable());
755		Thread t = newStartedThread(new CheckedRunnable() {
756		public void realRun() throws Exception {
757		Thread.currentThread().interrupt();
758		try {
759	<	task.get(2*LONG_DELAY_MS, MILLISECONDS);
759	>	task.get(randomTimeout(), randomTimeUnit());
760		shouldThrow();
761		} catch (InterruptedException success) {}
762		assertFalse(Thread.interrupted());
763
764		pleaseInterrupt.countDown();
765		try {
766	<	task.get(2*LONG_DELAY_MS, MILLISECONDS);
766	>	task.get(LONGER_DELAY_MS, MILLISECONDS);
767		shouldThrow();
768		} catch (InterruptedException success) {}
769		assertFalse(Thread.interrupted());
770		}});
771
772		await(pleaseInterrupt);
773	+	if (randomBoolean()) assertThreadBlocks(t, Thread.State.TIMED_WAITING);
774		t.interrupt();
775		awaitTermination(t);
776		checkNotDone(task);
#	Line 685 | Line 780 | public class FutureTaskTest extends JSR1
780		* A timed out timed get throws TimeoutException
781		*/
782		public void testGet_TimeoutException() throws Exception {
783	<	FutureTask task = new FutureTask(new NoOpCallable());
783	>	FutureTask<Object> task = new FutureTask<Object>(new NoOpCallable());
784		long startTime = System.nanoTime();
785		try {
786		task.get(timeoutMillis(), MILLISECONDS);
#	Line 699 | Line 794 | public class FutureTaskTest extends JSR1
794		* timed get with null TimeUnit throws NullPointerException
795		*/
796		public void testGet_NullTimeUnit() throws Exception {
797	<	FutureTask task = new FutureTask(new NoOpCallable());
797	>	FutureTask<Object> task = new FutureTask<Object>(new NoOpCallable());
798		long[] timeouts = { Long.MIN_VALUE, 0L, Long.MAX_VALUE };
799
800		for (long timeout : timeouts) {
#	Line 719 | Line 814 | public class FutureTaskTest extends JSR1
814		}
815		}
816
817	+	/**
818	+	* timed get with most negative timeout works correctly (i.e. no
819	+	* underflow bug)
820	+	*/
821	+	public void testGet_NegativeInfinityTimeout() throws Exception {
822	+	final ExecutorService pool = Executors.newFixedThreadPool(10);
823	+	final Runnable nop = new Runnable() { public void run() {}};
824	+	final FutureTask<Void> task = new FutureTask<>(nop, null);
825	+	final List<Future<?>> futures = new ArrayList<>();
826	+	Runnable r = new Runnable() { public void run() {
827	+	for (long timeout : new long[] { 0L, -1L, Long.MIN_VALUE }) {
828	+	try {
829	+	task.get(timeout, NANOSECONDS);
830	+	shouldThrow();
831	+	} catch (TimeoutException success) {
832	+	} catch (Throwable fail) {threadUnexpectedException(fail);}}}};
833	+	for (int i = 0; i < 10; i++)
834	+	futures.add(pool.submit(r));
835	+	try {
836	+	joinPool(pool);
837	+	for (Future<?> future : futures)
838	+	checkCompletedNormally(future, null);
839	+	} finally {
840	+	task.run();         // last resort to help terminate
841	+	}
842	+	}
843	+
844	+	/**
845	+	* toString indicates current completion state
846	+	*/
847	+	public void testToString_incomplete() {
848	+	FutureTask<String> f = new FutureTask<>(() -> "");
849	+	assertTrue(f.toString().matches(".*\\[.*Not completed.*\\]"));
850	+	if (testImplementationDetails)
851	+	assertTrue(f.toString().startsWith(
852	+	identityString(f) + "[Not completed, task ="));
853	+	}
854	+
855	+	public void testToString_normal() {
856	+	FutureTask<String> f = new FutureTask<>(() -> "");
857	+	f.run();
858	+	assertTrue(f.toString().matches(".*\\[.*Completed normally.*\\]"));
859	+	if (testImplementationDetails)
860	+	assertEquals(identityString(f) + "[Completed normally]",
861	+	f.toString());
862	+	}
863	+
864	+	public void testToString_exception() {
865	+	FutureTask<String> f = new FutureTask<>(
866	+	() -> { throw new ArithmeticException(); });
867	+	f.run();
868	+	assertTrue(f.toString().matches(".*\\[.*Completed exceptionally.*\\]"));
869	+	if (testImplementationDetails)
870	+	assertTrue(f.toString().startsWith(
871	+	identityString(f) + "[Completed exceptionally: "));
872	+	}
873	+
874	+	public void testToString_cancelled() {
875	+	for (boolean mayInterruptIfRunning : new boolean[] { true, false }) {
876	+	FutureTask<String> f = new FutureTask<>(() -> "");
877	+	assertTrue(f.cancel(mayInterruptIfRunning));
878	+	assertTrue(f.toString().matches(".*\\[.*Cancelled.*\\]"));
879	+	if (testImplementationDetails)
880	+	assertEquals(identityString(f) + "[Cancelled]",
881	+	f.toString());
882	+	}
883	+	}
884	+
885		}

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