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Comparing jsr166/src/test/tck/CompletableFutureTest.java (file contents):
Revision 1.163 by jsr166, Sun Jul 3 18:33:17 2016 UTC vs.
Revision 1.185 by jsr166, Mon May 29 19:15:02 2017 UTC

#	Line 32 | Line 32 | import java.util.concurrent.ForkJoinPool
32		import java.util.concurrent.ForkJoinTask;
33		import java.util.concurrent.RejectedExecutionException;
34		import java.util.concurrent.TimeoutException;
35	–	import java.util.concurrent.TimeUnit;
35		import java.util.concurrent.atomic.AtomicInteger;
36		import java.util.concurrent.atomic.AtomicReference;
37		import java.util.function.BiConsumer;
#	Line 65 | Line 64 | public class CompletableFutureTest exten
64		assertNull(f.getNow(null));
65		} catch (Throwable fail) { threadUnexpectedException(fail); }
66		try {
67	<	f.get(0L, SECONDS);
67	>	f.get(randomExpiredTimeout(), randomTimeUnit());
68		shouldThrow();
69		}
70		catch (TimeoutException success) {}
#	Line 77 | Line 76 | public class CompletableFutureTest exten
76
77		try {
78		assertEquals(value, f.join());
80	–	} catch (Throwable fail) { threadUnexpectedException(fail); }
81	–	try {
79		assertEquals(value, f.getNow(null));
83	–	} catch (Throwable fail) { threadUnexpectedException(fail); }
84	–	try {
80		assertEquals(value, f.get());
81		} catch (Throwable fail) { threadUnexpectedException(fail); }
82		assertTrue(f.isDone());
#	Line 94 | Line 89 | public class CompletableFutureTest exten
89		* Returns the "raw" internal exceptional completion of f,
90		* without any additional wrapping with CompletionException.
91		*/
92	<	<U> Throwable exceptionalCompletion(CompletableFuture<U> f) {
93	<	// handle (and whenComplete) can distinguish between "direct"
94	<	// and "wrapped" exceptional completion
95	<	return f.handle((U u, Throwable t) -> t).join();
92	>	Throwable exceptionalCompletion(CompletableFuture<?> f) {
93	>	// handle (and whenComplete and exceptionally) can distinguish
94	>	// between "direct" and "wrapped" exceptional completion
95	>	return f.handle((u, t) -> t).join();
96		}
97
98		void checkCompletedExceptionally(CompletableFuture<?> f,
#	Line 148 | Line 143 | public class CompletableFutureTest exten
143
144		void checkCompletedWithWrappedCFException(CompletableFuture<?> f) {
145		checkCompletedExceptionally(f, true,
146	<	(t) -> assertTrue(t instanceof CFException));
146	>	t -> assertTrue(t instanceof CFException));
147		}
148
149		void checkCompletedWithWrappedCancellationException(CompletableFuture<?> f) {
150		checkCompletedExceptionally(f, true,
151	<	(t) -> assertTrue(t instanceof CancellationException));
151	>	t -> assertTrue(t instanceof CancellationException));
152		}
153
154		void checkCompletedWithTimeoutException(CompletableFuture<?> f) {
155		checkCompletedExceptionally(f, false,
156	<	(t) -> assertTrue(t instanceof TimeoutException));
156	>	t -> assertTrue(t instanceof TimeoutException));
157		}
158
159		void checkCompletedWithWrappedException(CompletableFuture<?> f,
160		Throwable ex) {
161	<	checkCompletedExceptionally(f, true, (t) -> assertSame(t, ex));
161	>	checkCompletedExceptionally(f, true, t -> assertSame(t, ex));
162		}
163
164		void checkCompletedExceptionally(CompletableFuture<?> f, Throwable ex) {
165	<	checkCompletedExceptionally(f, false, (t) -> assertSame(t, ex));
165	>	checkCompletedExceptionally(f, false, t -> assertSame(t, ex));
166		}
167
168		void checkCancelled(CompletableFuture<?> f) {
#	Line 362 | Line 357 | public class CompletableFutureTest exten
357		checkCompletedNormally(f, "test");
358		}
359
360	<	abstract class CheckedAction {
360	>	abstract static class CheckedAction {
361		int invocationCount = 0;
362		final ExecutionMode m;
363		CheckedAction(ExecutionMode m) { this.m = m; }
#	Line 374 | Line 369 | public class CompletableFutureTest exten
369		void assertInvoked() { assertEquals(1, invocationCount); }
370		}
371
372	<	abstract class CheckedIntegerAction extends CheckedAction {
372	>	abstract static class CheckedIntegerAction extends CheckedAction {
373		Integer value;
374		CheckedIntegerAction(ExecutionMode m) { super(m); }
375		void assertValue(Integer expected) {
#	Line 383 | Line 378 | public class CompletableFutureTest exten
378		}
379		}
380
381	<	class IntegerSupplier extends CheckedAction
381	>	static class IntegerSupplier extends CheckedAction
382		implements Supplier<Integer>
383		{
384		final Integer value;
#	Line 402 | Line 397 | public class CompletableFutureTest exten
397		return (x == null) ? null : x + 1;
398		}
399
400	<	class NoopConsumer extends CheckedIntegerAction
400	>	static class NoopConsumer extends CheckedIntegerAction
401		implements Consumer<Integer>
402		{
403		NoopConsumer(ExecutionMode m) { super(m); }
#	Line 412 | Line 407 | public class CompletableFutureTest exten
407		}
408		}
409
410	<	class IncFunction extends CheckedIntegerAction
410	>	static class IncFunction extends CheckedIntegerAction
411		implements Function<Integer,Integer>
412		{
413		IncFunction(ExecutionMode m) { super(m); }
#	Line 430 | Line 425 | public class CompletableFutureTest exten
425		- ((y == null) ? 99 : y.intValue());
426		}
427
428	<	class SubtractAction extends CheckedIntegerAction
428	>	static class SubtractAction extends CheckedIntegerAction
429		implements BiConsumer<Integer, Integer>
430		{
431		SubtractAction(ExecutionMode m) { super(m); }
#	Line 440 | Line 435 | public class CompletableFutureTest exten
435		}
436		}
437
438	<	class SubtractFunction extends CheckedIntegerAction
438	>	static class SubtractFunction extends CheckedIntegerAction
439		implements BiFunction<Integer, Integer, Integer>
440		{
441		SubtractFunction(ExecutionMode m) { super(m); }
#	Line 450 | Line 445 | public class CompletableFutureTest exten
445		}
446		}
447
448	<	class Noop extends CheckedAction implements Runnable {
448	>	static class Noop extends CheckedAction implements Runnable {
449		Noop(ExecutionMode m) { super(m); }
450		public void run() {
451		invoked();
452		}
453		}
454
455	<	class FailingSupplier extends CheckedAction
455	>	static class FailingSupplier extends CheckedAction
456		implements Supplier<Integer>
457		{
458		final CFException ex;
#	Line 468 | Line 463 | public class CompletableFutureTest exten
463		}
464		}
465
466	<	class FailingConsumer extends CheckedIntegerAction
466	>	static class FailingConsumer extends CheckedIntegerAction
467		implements Consumer<Integer>
468		{
469		final CFException ex;
#	Line 480 | Line 475 | public class CompletableFutureTest exten
475		}
476		}
477
478	<	class FailingBiConsumer extends CheckedIntegerAction
478	>	static class FailingBiConsumer extends CheckedIntegerAction
479		implements BiConsumer<Integer, Integer>
480		{
481		final CFException ex;
#	Line 492 | Line 487 | public class CompletableFutureTest exten
487		}
488		}
489
490	<	class FailingFunction extends CheckedIntegerAction
490	>	static class FailingFunction extends CheckedIntegerAction
491		implements Function<Integer, Integer>
492		{
493		final CFException ex;
#	Line 504 | Line 499 | public class CompletableFutureTest exten
499		}
500		}
501
502	<	class FailingBiFunction extends CheckedIntegerAction
502	>	static class FailingBiFunction extends CheckedIntegerAction
503		implements BiFunction<Integer, Integer, Integer>
504		{
505		final CFException ex;
#	Line 516 | Line 511 | public class CompletableFutureTest exten
511		}
512		}
513
514	<	class FailingRunnable extends CheckedAction implements Runnable {
514	>	static class FailingRunnable extends CheckedAction implements Runnable {
515		final CFException ex;
516		FailingRunnable(ExecutionMode m) { super(m); ex = new CFException(); }
517		public void run() {
#	Line 525 | Line 520 | public class CompletableFutureTest exten
520		}
521		}
522
523	<	class CompletableFutureInc extends CheckedIntegerAction
523	>	static class CompletableFutureInc extends CheckedIntegerAction
524		implements Function<Integer, CompletableFuture<Integer>>
525		{
526		CompletableFutureInc(ExecutionMode m) { super(m); }
#	Line 538 | Line 533 | public class CompletableFutureTest exten
533		}
534		}
535
536	<	class FailingCompletableFutureFunction extends CheckedIntegerAction
536	>	static class FailingCompletableFutureFunction extends CheckedIntegerAction
537		implements Function<Integer, CompletableFuture<Integer>>
538		{
539		final CFException ex;
#	Line 2563 | Line 2558 | public class CompletableFutureTest exten
2558
2559		// unspecified behavior - both source completions available
2560		try {
2561	<	assertEquals(null, h0.join());
2561	>	assertNull(h0.join());
2562		rs[0].assertValue(v1);
2563		} catch (CompletionException ok) {
2564		checkCompletedWithWrappedException(h0, ex);
2565		rs[0].assertNotInvoked();
2566		}
2567		try {
2568	<	assertEquals(null, h1.join());
2568	>	assertNull(h1.join());
2569		rs[1].assertValue(v1);
2570		} catch (CompletionException ok) {
2571		checkCompletedWithWrappedException(h1, ex);
2572		rs[1].assertNotInvoked();
2573		}
2574		try {
2575	<	assertEquals(null, h2.join());
2575	>	assertNull(h2.join());
2576		rs[2].assertValue(v1);
2577		} catch (CompletionException ok) {
2578		checkCompletedWithWrappedException(h2, ex);
2579		rs[2].assertNotInvoked();
2580		}
2581		try {
2582	<	assertEquals(null, h3.join());
2582	>	assertNull(h3.join());
2583		rs[3].assertValue(v1);
2584		} catch (CompletionException ok) {
2585		checkCompletedWithWrappedException(h3, ex);
#	Line 2823 | Line 2818 | public class CompletableFutureTest exten
2818
2819		// unspecified behavior - both source completions available
2820		try {
2821	<	assertEquals(null, h0.join());
2821	>	assertNull(h0.join());
2822		rs[0].assertInvoked();
2823		} catch (CompletionException ok) {
2824		checkCompletedWithWrappedException(h0, ex);
2825		rs[0].assertNotInvoked();
2826		}
2827		try {
2828	<	assertEquals(null, h1.join());
2828	>	assertNull(h1.join());
2829		rs[1].assertInvoked();
2830		} catch (CompletionException ok) {
2831		checkCompletedWithWrappedException(h1, ex);
2832		rs[1].assertNotInvoked();
2833		}
2834		try {
2835	<	assertEquals(null, h2.join());
2835	>	assertNull(h2.join());
2836		rs[2].assertInvoked();
2837		} catch (CompletionException ok) {
2838		checkCompletedWithWrappedException(h2, ex);
2839		rs[2].assertNotInvoked();
2840		}
2841		try {
2842	<	assertEquals(null, h3.join());
2842	>	assertNull(h3.join());
2843		rs[3].assertInvoked();
2844		} catch (CompletionException ok) {
2845		checkCompletedWithWrappedException(h3, ex);
#	Line 3258 | Line 3253 | public class CompletableFutureTest exten
3253
3254		() -> f.thenApply(null),
3255		() -> f.thenApplyAsync(null),
3256	<	() -> f.thenApplyAsync((x) -> x, null),
3256	>	() -> f.thenApplyAsync(x -> x, null),
3257		() -> f.thenApplyAsync(null, exec),
3258
3259		() -> f.thenAccept(null),
3260		() -> f.thenAcceptAsync(null),
3261	<	() -> f.thenAcceptAsync((x) -> {} , null),
3261	>	() -> f.thenAcceptAsync(x -> {} , null),
3262		() -> f.thenAcceptAsync(null, exec),
3263
3264		() -> f.thenRun(null),
#	Line 3298 | Line 3293 | public class CompletableFutureTest exten
3293		() -> f.applyToEither(g, null),
3294		() -> f.applyToEitherAsync(g, null),
3295		() -> f.applyToEitherAsync(g, null, exec),
3296	<	() -> f.applyToEither(nullFuture, (x) -> x),
3297	<	() -> f.applyToEitherAsync(nullFuture, (x) -> x),
3298	<	() -> f.applyToEitherAsync(nullFuture, (x) -> x, exec),
3299	<	() -> f.applyToEitherAsync(g, (x) -> x, null),
3296	>	() -> f.applyToEither(nullFuture, x -> x),
3297	>	() -> f.applyToEitherAsync(nullFuture, x -> x),
3298	>	() -> f.applyToEitherAsync(nullFuture, x -> x, exec),
3299	>	() -> f.applyToEitherAsync(g, x -> x, null),
3300
3301		() -> f.acceptEither(g, null),
3302		() -> f.acceptEitherAsync(g, null),
3303		() -> f.acceptEitherAsync(g, null, exec),
3304	<	() -> f.acceptEither(nullFuture, (x) -> {}),
3305	<	() -> f.acceptEitherAsync(nullFuture, (x) -> {}),
3306	<	() -> f.acceptEitherAsync(nullFuture, (x) -> {}, exec),
3307	<	() -> f.acceptEitherAsync(g, (x) -> {}, null),
3304	>	() -> f.acceptEither(nullFuture, x -> {}),
3305	>	() -> f.acceptEitherAsync(nullFuture, x -> {}),
3306	>	() -> f.acceptEitherAsync(nullFuture, x -> {}, exec),
3307	>	() -> f.acceptEitherAsync(g, x -> {}, null),
3308
3309		() -> f.runAfterEither(g, null),
3310		() -> f.runAfterEitherAsync(g, null),
#	Line 3375 | Line 3370 | public class CompletableFutureTest exten
3370		for (CompletableFuture<Integer> src : srcs) {
3371		List<CompletableFuture<?>> fs = new ArrayList<>();
3372		fs.add(src.thenRunAsync(() -> {}, e));
3373	<	fs.add(src.thenAcceptAsync((z) -> {}, e));
3374	<	fs.add(src.thenApplyAsync((z) -> z, e));
3373	>	fs.add(src.thenAcceptAsync(z -> {}, e));
3374	>	fs.add(src.thenApplyAsync(z -> z, e));
3375
3376		fs.add(src.thenCombineAsync(src, (x, y) -> x, e));
3377		fs.add(src.thenAcceptBothAsync(src, (x, y) -> {}, e));
3378		fs.add(src.runAfterBothAsync(src, () -> {}, e));
3379
3380	<	fs.add(src.applyToEitherAsync(src, (z) -> z, e));
3381	<	fs.add(src.acceptEitherAsync(src, (z) -> {}, e));
3380	>	fs.add(src.applyToEitherAsync(src, z -> z, e));
3381	>	fs.add(src.acceptEitherAsync(src, z -> {}, e));
3382		fs.add(src.runAfterEitherAsync(src, () -> {}, e));
3383
3384	<	fs.add(src.thenComposeAsync((z) -> null, e));
3384	>	fs.add(src.thenComposeAsync(z -> null, e));
3385		fs.add(src.whenCompleteAsync((z, t) -> {}, e));
3386		fs.add(src.handleAsync((z, t) -> null, e));
3387
#	Line 3419 | Line 3414 | public class CompletableFutureTest exten
3414		{
3415		List<CompletableFuture<?>> fs = new ArrayList<>();
3416
3417	<	fs.add(complete.applyToEitherAsync(incomplete, (z) -> z, e));
3418	<	fs.add(incomplete.applyToEitherAsync(complete, (z) -> z, e));
3417	>	fs.add(complete.applyToEitherAsync(incomplete, z -> z, e));
3418	>	fs.add(incomplete.applyToEitherAsync(complete, z -> z, e));
3419
3420	<	fs.add(complete.acceptEitherAsync(incomplete, (z) -> {}, e));
3421	<	fs.add(incomplete.acceptEitherAsync(complete, (z) -> {}, e));
3420	>	fs.add(complete.acceptEitherAsync(incomplete, z -> {}, e));
3421	>	fs.add(incomplete.acceptEitherAsync(complete, z -> {}, e));
3422
3423		fs.add(complete.runAfterEitherAsync(incomplete, () -> {}, e));
3424		fs.add(incomplete.runAfterEitherAsync(complete, () -> {}, e));
#	Line 3462 | Line 3457 | public class CompletableFutureTest exten
3457
3458		List<CompletableFuture<?>> fs = new ArrayList<>();
3459		fs.add(incomplete.thenRunAsync(() -> {}, e));
3460	<	fs.add(incomplete.thenAcceptAsync((z) -> {}, e));
3461	<	fs.add(incomplete.thenApplyAsync((z) -> z, e));
3460	>	fs.add(incomplete.thenAcceptAsync(z -> {}, e));
3461	>	fs.add(incomplete.thenApplyAsync(z -> z, e));
3462
3463		fs.add(incomplete.thenCombineAsync(incomplete, (x, y) -> x, e));
3464		fs.add(incomplete.thenAcceptBothAsync(incomplete, (x, y) -> {}, e));
3465		fs.add(incomplete.runAfterBothAsync(incomplete, () -> {}, e));
3466
3467	<	fs.add(incomplete.applyToEitherAsync(incomplete, (z) -> z, e));
3468	<	fs.add(incomplete.acceptEitherAsync(incomplete, (z) -> {}, e));
3467	>	fs.add(incomplete.applyToEitherAsync(incomplete, z -> z, e));
3468	>	fs.add(incomplete.acceptEitherAsync(incomplete, z -> {}, e));
3469		fs.add(incomplete.runAfterEitherAsync(incomplete, () -> {}, e));
3470
3471	<	fs.add(incomplete.thenComposeAsync((z) -> null, e));
3471	>	fs.add(incomplete.thenComposeAsync(z -> null, e));
3472		fs.add(incomplete.whenCompleteAsync((z, t) -> {}, e));
3473		fs.add(incomplete.handleAsync((z, t) -> null, e));
3474
#	Line 3533 | Line 3528 | public class CompletableFutureTest exten
3528		*/
3529		public void testCompletedStage() {
3530		AtomicInteger x = new AtomicInteger(0);
3531	<	AtomicReference<Throwable> r = new AtomicReference<Throwable>();
3531	>	AtomicReference<Throwable> r = new AtomicReference<>();
3532		CompletionStage<Integer> f = CompletableFuture.completedStage(1);
3533		f.whenComplete((v, e) -> {if (e != null) r.set(e); else x.set(v);});
3534		assertEquals(x.get(), 1);
#	Line 3578 | Line 3573 | public class CompletableFutureTest exten
3573		* copy returns a CompletableFuture that is completed normally,
3574		* with the same value, when source is.
3575		*/
3576	<	public void testCopy() {
3576	>	public void testCopy_normalCompletion() {
3577	>	for (boolean createIncomplete : new boolean[] { true, false })
3578	>	for (Integer v1 : new Integer[] { 1, null })
3579	>	{
3580		CompletableFuture<Integer> f = new CompletableFuture<>();
3581	+	if (!createIncomplete) assertTrue(f.complete(v1));
3582		CompletableFuture<Integer> g = f.copy();
3583	<	checkIncomplete(f);
3584	<	checkIncomplete(g);
3585	<	f.complete(1);
3586	<	checkCompletedNormally(f, 1);
3587	<	checkCompletedNormally(g, 1);
3588	<	}
3583	>	if (createIncomplete) {
3584	>	checkIncomplete(f);
3585	>	checkIncomplete(g);
3586	>	assertTrue(f.complete(v1));
3587	>	}
3588	>	checkCompletedNormally(f, v1);
3589	>	checkCompletedNormally(g, v1);
3590	>	}}
3591
3592		/**
3593		* copy returns a CompletableFuture that is completed exceptionally
3594		* when source is.
3595		*/
3596	<	public void testCopy2() {
3596	>	public void testCopy_exceptionalCompletion() {
3597	>	for (boolean createIncomplete : new boolean[] { true, false })
3598	>	{
3599	>	CFException ex = new CFException();
3600		CompletableFuture<Integer> f = new CompletableFuture<>();
3601	+	if (!createIncomplete) f.completeExceptionally(ex);
3602		CompletableFuture<Integer> g = f.copy();
3603	<	checkIncomplete(f);
3604	<	checkIncomplete(g);
3605	<	CFException ex = new CFException();
3606	<	f.completeExceptionally(ex);
3603	>	if (createIncomplete) {
3604	>	checkIncomplete(f);
3605	>	checkIncomplete(g);
3606	>	f.completeExceptionally(ex);
3607	>	}
3608		checkCompletedExceptionally(f, ex);
3609		checkCompletedWithWrappedException(g, ex);
3610	+	}}
3611	+
3612	+	/**
3613	+	* Completion of a copy does not complete its source.
3614	+	*/
3615	+	public void testCopy_oneWayPropagation() {
3616	+	CompletableFuture<Integer> f = new CompletableFuture<>();
3617	+	assertTrue(f.copy().complete(1));
3618	+	assertTrue(f.copy().complete(null));
3619	+	assertTrue(f.copy().cancel(true));
3620	+	assertTrue(f.copy().cancel(false));
3621	+	assertTrue(f.copy().completeExceptionally(new CFException()));
3622	+	checkIncomplete(f);
3623		}
3624
3625		/**
#	Line 3611 | Line 3630 | public class CompletableFutureTest exten
3630		CompletableFuture<Integer> f = new CompletableFuture<>();
3631		CompletionStage<Integer> g = f.minimalCompletionStage();
3632		AtomicInteger x = new AtomicInteger(0);
3633	<	AtomicReference<Throwable> r = new AtomicReference<Throwable>();
3633	>	AtomicReference<Throwable> r = new AtomicReference<>();
3634		checkIncomplete(f);
3635		g.whenComplete((v, e) -> {if (e != null) r.set(e); else x.set(v);});
3636		f.complete(1);
#	Line 3628 | Line 3647 | public class CompletableFutureTest exten
3647		CompletableFuture<Integer> f = new CompletableFuture<>();
3648		CompletionStage<Integer> g = f.minimalCompletionStage();
3649		AtomicInteger x = new AtomicInteger(0);
3650	<	AtomicReference<Throwable> r = new AtomicReference<Throwable>();
3650	>	AtomicReference<Throwable> r = new AtomicReference<>();
3651		g.whenComplete((v, e) -> {if (e != null) r.set(e); else x.set(v);});
3652		checkIncomplete(f);
3653		CFException ex = new CFException();
#	Line 3646 | Line 3665 | public class CompletableFutureTest exten
3665		CFException ex = new CFException();
3666		CompletionStage<Integer> f = CompletableFuture.failedStage(ex);
3667		AtomicInteger x = new AtomicInteger(0);
3668	<	AtomicReference<Throwable> r = new AtomicReference<Throwable>();
3668	>	AtomicReference<Throwable> r = new AtomicReference<>();
3669		f.whenComplete((v, e) -> {if (e != null) r.set(e); else x.set(v);});
3670		assertEquals(x.get(), 0);
3671		assertEquals(r.get(), ex);
#	Line 3670 | Line 3689 | public class CompletableFutureTest exten
3689		public void testCompleteAsync2() {
3690		CompletableFuture<Integer> f = new CompletableFuture<>();
3691		CFException ex = new CFException();
3692	<	f.completeAsync(() -> {if (true) throw ex; return 1;});
3692	>	f.completeAsync(() -> { throw ex; });
3693		try {
3694		f.join();
3695		shouldThrow();
#	Line 3700 | Line 3719 | public class CompletableFutureTest exten
3719		CompletableFuture<Integer> f = new CompletableFuture<>();
3720		CFException ex = new CFException();
3721		ThreadExecutor executor = new ThreadExecutor();
3722	<	f.completeAsync(() -> {if (true) throw ex; return 1;}, executor);
3722	>	f.completeAsync(() -> { throw ex; }, executor);
3723		try {
3724		f.join();
3725		shouldThrow();
#	Line 3852 | Line 3871 | public class CompletableFutureTest exten
3871		final CompletableFuture<Integer> v42 = CompletableFuture.completedFuture(42);
3872		final CompletableFuture<Integer> incomplete = new CompletableFuture<>();
3873
3874	+	final Runnable noopRunnable = new Noop(m);
3875	+	final Consumer<Integer> noopConsumer = new NoopConsumer(m);
3876	+	final Function<Integer, Integer> incFunction = new IncFunction(m);
3877	+
3878		List<Function<CompletableFuture<Integer>, CompletableFuture<?>>> funs
3879		= new ArrayList<>();
3880
3881	<	funs.add((y) -> m.thenRun(y, new Noop(m)));
3882	<	funs.add((y) -> m.thenAccept(y, new NoopConsumer(m)));
3883	<	funs.add((y) -> m.thenApply(y, new IncFunction(m)));
3884	<
3885	<	funs.add((y) -> m.runAfterEither(y, incomplete, new Noop(m)));
3886	<	funs.add((y) -> m.acceptEither(y, incomplete, new NoopConsumer(m)));
3887	<	funs.add((y) -> m.applyToEither(y, incomplete, new IncFunction(m)));
3888	<
3889	<	funs.add((y) -> m.runAfterBoth(y, v42, new Noop(m)));
3890	<	funs.add((y) -> m.runAfterBoth(v42, y, new Noop(m)));
3891	<	funs.add((y) -> m.thenAcceptBoth(y, v42, new SubtractAction(m)));
3892	<	funs.add((y) -> m.thenAcceptBoth(v42, y, new SubtractAction(m)));
3893	<	funs.add((y) -> m.thenCombine(y, v42, new SubtractFunction(m)));
3894	<	funs.add((y) -> m.thenCombine(v42, y, new SubtractFunction(m)));
3895	<
3896	<	funs.add((y) -> m.whenComplete(y, (Integer r, Throwable t) -> {}));
3897	<
3898	<	funs.add((y) -> m.thenCompose(y, new CompletableFutureInc(m)));
3899	<
3900	<	funs.add((y) -> CompletableFuture.allOf(new CompletableFuture<?>[] {y}));
3901	<	funs.add((y) -> CompletableFuture.allOf(new CompletableFuture<?>[] {y, v42}));
3902	<	funs.add((y) -> CompletableFuture.allOf(new CompletableFuture<?>[] {v42, y}));
3903	<	funs.add((y) -> CompletableFuture.anyOf(new CompletableFuture<?>[] {y}));
3904	<	funs.add((y) -> CompletableFuture.anyOf(new CompletableFuture<?>[] {y, incomplete}));
3905	<	funs.add((y) -> CompletableFuture.anyOf(new CompletableFuture<?>[] {incomplete, y}));
3881	>	funs.add(y -> m.thenRun(y, noopRunnable));
3882	>	funs.add(y -> m.thenAccept(y, noopConsumer));
3883	>	funs.add(y -> m.thenApply(y, incFunction));
3884	>
3885	>	funs.add(y -> m.runAfterEither(y, incomplete, noopRunnable));
3886	>	funs.add(y -> m.acceptEither(y, incomplete, noopConsumer));
3887	>	funs.add(y -> m.applyToEither(y, incomplete, incFunction));
3888	>
3889	>	funs.add(y -> m.runAfterBoth(y, v42, noopRunnable));
3890	>	funs.add(y -> m.runAfterBoth(v42, y, noopRunnable));
3891	>	funs.add(y -> m.thenAcceptBoth(y, v42, new SubtractAction(m)));
3892	>	funs.add(y -> m.thenAcceptBoth(v42, y, new SubtractAction(m)));
3893	>	funs.add(y -> m.thenCombine(y, v42, new SubtractFunction(m)));
3894	>	funs.add(y -> m.thenCombine(v42, y, new SubtractFunction(m)));
3895	>
3896	>	funs.add(y -> m.whenComplete(y, (Integer r, Throwable t) -> {}));
3897	>
3898	>	funs.add(y -> m.thenCompose(y, new CompletableFutureInc(m)));
3899	>
3900	>	funs.add(y -> CompletableFuture.allOf(y));
3901	>	funs.add(y -> CompletableFuture.allOf(y, v42));
3902	>	funs.add(y -> CompletableFuture.allOf(v42, y));
3903	>	funs.add(y -> CompletableFuture.anyOf(y));
3904	>	funs.add(y -> CompletableFuture.anyOf(y, incomplete));
3905	>	funs.add(y -> CompletableFuture.anyOf(incomplete, y));
3906
3907		for (Function<CompletableFuture<Integer>, CompletableFuture<?>>
3908		fun : funs) {
3909		CompletableFuture<Integer> f = new CompletableFuture<>();
3910		f.completeExceptionally(ex);
3911	<	CompletableFuture<Integer> src = m.thenApply(f, new IncFunction(m));
3911	>	CompletableFuture<Integer> src = m.thenApply(f, incFunction);
3912		checkCompletedWithWrappedException(src, ex);
3913		CompletableFuture<?> dep = fun.apply(src);
3914		checkCompletedWithWrappedException(dep, ex);
#	Line 3895 | Line 3918 | public class CompletableFutureTest exten
3918		for (Function<CompletableFuture<Integer>, CompletableFuture<?>>
3919		fun : funs) {
3920		CompletableFuture<Integer> f = new CompletableFuture<>();
3921	<	CompletableFuture<Integer> src = m.thenApply(f, new IncFunction(m));
3921	>	CompletableFuture<Integer> src = m.thenApply(f, incFunction);
3922		CompletableFuture<?> dep = fun.apply(src);
3923		f.completeExceptionally(ex);
3924		checkCompletedWithWrappedException(src, ex);
#	Line 3909 | Line 3932 | public class CompletableFutureTest exten
3932		CompletableFuture<Integer> f = new CompletableFuture<>();
3933		f.cancel(mayInterruptIfRunning);
3934		checkCancelled(f);
3935	<	CompletableFuture<Integer> src = m.thenApply(f, new IncFunction(m));
3935	>	CompletableFuture<Integer> src = m.thenApply(f, incFunction);
3936		checkCompletedWithWrappedCancellationException(src);
3937		CompletableFuture<?> dep = fun.apply(src);
3938		checkCompletedWithWrappedCancellationException(dep);
#	Line 3920 | Line 3943 | public class CompletableFutureTest exten
3943		for (Function<CompletableFuture<Integer>, CompletableFuture<?>>
3944		fun : funs) {
3945		CompletableFuture<Integer> f = new CompletableFuture<>();
3946	<	CompletableFuture<Integer> src = m.thenApply(f, new IncFunction(m));
3946	>	CompletableFuture<Integer> src = m.thenApply(f, incFunction);
3947		CompletableFuture<?> dep = fun.apply(src);
3948		f.cancel(mayInterruptIfRunning);
3949		checkCancelled(f);
#	Line 3931 | Line 3954 | public class CompletableFutureTest exten
3954		}}
3955
3956		/**
3957	<	* Minimal completion stages throw UOE for all non-CompletionStage methods
3957	>	* Minimal completion stages throw UOE for most non-CompletionStage methods
3958		*/
3959		public void testMinimalCompletionStage_minimality() {
3960		if (!testImplementationDetails) return;
3961		Function<Method, String> toSignature =
3962	<	(method) -> method.getName() + Arrays.toString(method.getParameterTypes());
3962	>	method -> method.getName() + Arrays.toString(method.getParameterTypes());
3963		Predicate<Method> isNotStatic =
3964	<	(method) -> (method.getModifiers() & Modifier.STATIC) == 0;
3964	>	method -> (method.getModifiers() & Modifier.STATIC) == 0;
3965		List<Method> minimalMethods =
3966		Stream.of(Object.class, CompletionStage.class)
3967	<	.flatMap((klazz) -> Stream.of(klazz.getMethods()))
3967	>	.flatMap(klazz -> Stream.of(klazz.getMethods()))
3968		.filter(isNotStatic)
3969		.collect(Collectors.toList());
3970		// Methods from CompletableFuture permitted NOT to throw UOE
#	Line 3957 | Line 3980 | public class CompletableFutureTest exten
3980		.collect(Collectors.toSet());
3981		List<Method> allMethods = Stream.of(CompletableFuture.class.getMethods())
3982		.filter(isNotStatic)
3983	<	.filter((method) -> !permittedMethodSignatures.contains(toSignature.apply(method)))
3983	>	.filter(method -> !permittedMethodSignatures.contains(toSignature.apply(method)))
3984		.collect(Collectors.toList());
3985
3986	<	CompletionStage<Integer> minimalStage =
3986	>	List<CompletionStage<Integer>> stages = new ArrayList<>();
3987	>	CompletionStage<Integer> min =
3988		new CompletableFuture<Integer>().minimalCompletionStage();
3989	+	stages.add(min);
3990	+	stages.add(min.thenApply(x -> x));
3991	+	stages.add(CompletableFuture.completedStage(1));
3992	+	stages.add(CompletableFuture.failedStage(new CFException()));
3993
3994		List<Method> bugs = new ArrayList<>();
3995		for (Method method : allMethods) {
#	Line 3977 | Line 4005 | public class CompletableFutureTest exten
4005		else if (parameterTypes[i] == long.class)
4006		args[i] = 0L;
4007		}
4008	<	try {
4009	<	method.invoke(minimalStage, args);
4010	<	bugs.add(method);
3983	<	}
3984	<	catch (java.lang.reflect.InvocationTargetException expected) {
3985	<	if (! (expected.getCause() instanceof UnsupportedOperationException)) {
4008	>	for (CompletionStage<Integer> stage : stages) {
4009	>	try {
4010	>	method.invoke(stage, args);
4011		bugs.add(method);
3987	–	// expected.getCause().printStackTrace();
4012		}
4013	+	catch (java.lang.reflect.InvocationTargetException expected) {
4014	+	if (! (expected.getCause() instanceof UnsupportedOperationException)) {
4015	+	bugs.add(method);
4016	+	// expected.getCause().printStackTrace();
4017	+	}
4018	+	}
4019	+	catch (ReflectiveOperationException bad) { throw new Error(bad); }
4020		}
3990	–	catch (ReflectiveOperationException bad) { throw new Error(bad); }
4021		}
4022		if (!bugs.isEmpty())
4023	<	throw new Error("Methods did not throw UOE: " + bugs.toString());
4023	>	throw new Error("Methods did not throw UOE: " + bugs);
4024		}
4025
4026	+	/**
4027	+	* minimalStage.toCompletableFuture() returns a CompletableFuture that
4028	+	* is completed normally, with the same value, when source is.
4029	+	*/
4030	+	public void testMinimalCompletionStage_toCompletableFuture_normalCompletion() {
4031	+	for (boolean createIncomplete : new boolean[] { true, false })
4032	+	for (Integer v1 : new Integer[] { 1, null })
4033	+	{
4034	+	CompletableFuture<Integer> f = new CompletableFuture<>();
4035	+	CompletionStage<Integer> minimal = f.minimalCompletionStage();
4036	+	if (!createIncomplete) assertTrue(f.complete(v1));
4037	+	CompletableFuture<Integer> g = minimal.toCompletableFuture();
4038	+	if (createIncomplete) {
4039	+	checkIncomplete(f);
4040	+	checkIncomplete(g);
4041	+	assertTrue(f.complete(v1));
4042	+	}
4043	+	checkCompletedNormally(f, v1);
4044	+	checkCompletedNormally(g, v1);
4045	+	}}
4046	+
4047	+	/**
4048	+	* minimalStage.toCompletableFuture() returns a CompletableFuture that
4049	+	* is completed exceptionally when source is.
4050	+	*/
4051	+	public void testMinimalCompletionStage_toCompletableFuture_exceptionalCompletion() {
4052	+	for (boolean createIncomplete : new boolean[] { true, false })
4053	+	{
4054	+	CFException ex = new CFException();
4055	+	CompletableFuture<Integer> f = new CompletableFuture<>();
4056	+	CompletionStage<Integer> minimal = f.minimalCompletionStage();
4057	+	if (!createIncomplete) f.completeExceptionally(ex);
4058	+	CompletableFuture<Integer> g = minimal.toCompletableFuture();
4059	+	if (createIncomplete) {
4060	+	checkIncomplete(f);
4061	+	checkIncomplete(g);
4062	+	f.completeExceptionally(ex);
4063	+	}
4064	+	checkCompletedExceptionally(f, ex);
4065	+	checkCompletedWithWrappedException(g, ex);
4066	+	}}
4067	+
4068	+	/**
4069	+	* minimalStage.toCompletableFuture() gives mutable CompletableFuture
4070	+	*/
4071	+	public void testMinimalCompletionStage_toCompletableFuture_mutable() {
4072	+	for (Integer v1 : new Integer[] { 1, null })
4073	+	{
4074	+	CompletableFuture<Integer> f = new CompletableFuture<>();
4075	+	CompletionStage minimal = f.minimalCompletionStage();
4076	+	CompletableFuture<Integer> g = minimal.toCompletableFuture();
4077	+	assertTrue(g.complete(v1));
4078	+	checkCompletedNormally(g, v1);
4079	+	checkIncomplete(f);
4080	+	checkIncomplete(minimal.toCompletableFuture());
4081	+	}}
4082	+
4083	+	/**
4084	+	* minimalStage.toCompletableFuture().join() awaits completion
4085	+	*/
4086	+	public void testMinimalCompletionStage_toCompletableFuture_join() throws Exception {
4087	+	for (boolean createIncomplete : new boolean[] { true, false })
4088	+	for (Integer v1 : new Integer[] { 1, null })
4089	+	{
4090	+	CompletableFuture<Integer> f = new CompletableFuture<>();
4091	+	if (!createIncomplete) assertTrue(f.complete(v1));
4092	+	CompletionStage<Integer> minimal = f.minimalCompletionStage();
4093	+	if (createIncomplete) assertTrue(f.complete(v1));
4094	+	assertEquals(v1, minimal.toCompletableFuture().join());
4095	+	assertEquals(v1, minimal.toCompletableFuture().get());
4096	+	checkCompletedNormally(minimal.toCompletableFuture(), v1);
4097	+	}}
4098	+
4099	+	/**
4100	+	* Completion of a toCompletableFuture copy of a minimal stage
4101	+	* does not complete its source.
4102	+	*/
4103	+	public void testMinimalCompletionStage_toCompletableFuture_oneWayPropagation() {
4104	+	CompletableFuture<Integer> f = new CompletableFuture<>();
4105	+	CompletionStage<Integer> g = f.minimalCompletionStage();
4106	+	assertTrue(g.toCompletableFuture().complete(1));
4107	+	assertTrue(g.toCompletableFuture().complete(null));
4108	+	assertTrue(g.toCompletableFuture().cancel(true));
4109	+	assertTrue(g.toCompletableFuture().cancel(false));
4110	+	assertTrue(g.toCompletableFuture().completeExceptionally(new CFException()));
4111	+	checkIncomplete(g.toCompletableFuture());
4112	+	f.complete(1);
4113	+	checkCompletedNormally(g.toCompletableFuture(), 1);
4114	+	}
4115	+
4116	+	/** Demo utility method for external reliable toCompletableFuture */
4117	+	static <T> CompletableFuture<T> toCompletableFuture(CompletionStage<T> stage) {
4118	+	CompletableFuture<T> f = new CompletableFuture<>();
4119	+	stage.handle((T t, Throwable ex) -> {
4120	+	if (ex != null) f.completeExceptionally(ex);
4121	+	else f.complete(t);
4122	+	return null;
4123	+	});
4124	+	return f;
4125	+	}
4126	+
4127	+	/** Demo utility method to join a CompletionStage */
4128	+	static <T> T join(CompletionStage<T> stage) {
4129	+	return toCompletableFuture(stage).join();
4130	+	}
4131	+
4132	+	/**
4133	+	* Joining a minimal stage "by hand" works
4134	+	*/
4135	+	public void testMinimalCompletionStage_join_by_hand() {
4136	+	for (boolean createIncomplete : new boolean[] { true, false })
4137	+	for (Integer v1 : new Integer[] { 1, null })
4138	+	{
4139	+	CompletableFuture<Integer> f = new CompletableFuture<>();
4140	+	CompletionStage<Integer> minimal = f.minimalCompletionStage();
4141	+	CompletableFuture<Integer> g = new CompletableFuture<>();
4142	+	if (!createIncomplete) assertTrue(f.complete(v1));
4143	+	minimal.thenAccept(x -> g.complete(x));
4144	+	if (createIncomplete) assertTrue(f.complete(v1));
4145	+	g.join();
4146	+	checkCompletedNormally(g, v1);
4147	+	checkCompletedNormally(f, v1);
4148	+	assertEquals(v1, join(minimal));
4149	+	}}
4150	+
4151		static class Monad {
4152		static class ZeroException extends RuntimeException {
4153		public ZeroException() { super("monadic zero"); }
#	Line 4009 | Line 4164 | public class CompletableFutureTest exten
4164		static <T,U,V> Function<T, CompletableFuture<V>> compose
4165		(Function<T, CompletableFuture<U>> f,
4166		Function<U, CompletableFuture<V>> g) {
4167	<	return (x) -> f.apply(x).thenCompose(g);
4167	>	return x -> f.apply(x).thenCompose(g);
4168		}
4169
4170		static void assertZero(CompletableFuture<?> f) {
#	Line 4089 | Line 4244 | public class CompletableFutureTest exten
4244
4245		// Some mutually non-commutative functions
4246		Function<Long, CompletableFuture<Long>> triple
4247	<	= (x) -> Monad.unit(3 * x);
4247	>	= x -> Monad.unit(3 * x);
4248		Function<Long, CompletableFuture<Long>> inc
4249	<	= (x) -> Monad.unit(x + 1);
4249	>	= x -> Monad.unit(x + 1);
4250
4251		// unit is a right identity: m >>= unit === m
4252		Monad.assertFutureEquals(inc.apply(5L).thenCompose(unit),
#	Line 4103 | Line 4258 | public class CompletableFutureTest exten
4258		// associativity: (m >>= f) >>= g === m >>= ( \x -> (f x >>= g) )
4259		Monad.assertFutureEquals(
4260		unit.apply(5L).thenCompose(inc).thenCompose(triple),
4261	<	unit.apply(5L).thenCompose((x) -> inc.apply(x).thenCompose(triple)));
4261	>	unit.apply(5L).thenCompose(x -> inc.apply(x).thenCompose(triple)));
4262
4263		// The case for CompletableFuture as an additive monad is weaker...
4264
#	Line 4113 | Line 4268 | public class CompletableFutureTest exten
4268		// left zero: zero >>= f === zero
4269		Monad.assertZero(zero.thenCompose(inc));
4270		// right zero: f >>= (\x -> zero) === zero
4271	<	Monad.assertZero(inc.apply(5L).thenCompose((x) -> zero));
4271	>	Monad.assertZero(inc.apply(5L).thenCompose(x -> zero));
4272
4273		// f plus zero === f
4274		Monad.assertFutureEquals(Monad.unit(5L),
#	Line 4171 | Line 4326 | public class CompletableFutureTest exten
4326		final AtomicInteger count = new AtomicInteger(0);
4327		for (int i = 0; i < n; i++) {
4328		head.thenRun(() -> count.getAndIncrement());
4329	<	head.thenAccept((x) -> count.getAndIncrement());
4330	<	head.thenApply((x) -> count.getAndIncrement());
4329	>	head.thenAccept(x -> count.getAndIncrement());
4330	>	head.thenApply(x -> count.getAndIncrement());
4331
4332		head.runAfterBoth(complete, () -> count.getAndIncrement());
4333		head.thenAcceptBoth(complete, (x, y) -> count.getAndIncrement());
#	Line 4182 | Line 4337 | public class CompletableFutureTest exten
4337		complete.thenCombine(head, (x, y) -> count.getAndIncrement());
4338
4339		head.runAfterEither(new CompletableFuture<Void>(), () -> count.getAndIncrement());
4340	<	head.acceptEither(new CompletableFuture<Void>(), (x) -> count.getAndIncrement());
4341	<	head.applyToEither(new CompletableFuture<Void>(), (x) -> count.getAndIncrement());
4340	>	head.acceptEither(new CompletableFuture<Void>(), x -> count.getAndIncrement());
4341	>	head.applyToEither(new CompletableFuture<Void>(), x -> count.getAndIncrement());
4342		new CompletableFuture<Void>().runAfterEither(head, () -> count.getAndIncrement());
4343	<	new CompletableFuture<Void>().acceptEither(head, (x) -> count.getAndIncrement());
4344	<	new CompletableFuture<Void>().applyToEither(head, (x) -> count.getAndIncrement());
4343	>	new CompletableFuture<Void>().acceptEither(head, x -> count.getAndIncrement());
4344	>	new CompletableFuture<Void>().applyToEither(head, x -> count.getAndIncrement());
4345		}
4346		head.complete(null);
4347		assertEquals(5 * 3 * n, count.get());
#	Line 4203 | Line 4358 | public class CompletableFutureTest exten
4358		f.complete(null);
4359
4360		f = new CompletableFuture<>();
4361	<	f.acceptEither(incomplete, (x) -> {});
4361	>	f.acceptEither(incomplete, x -> {});
4362		f.complete(null);
4363
4364		f = new CompletableFuture<>();
4365	<	f.applyToEither(incomplete, (x) -> x);
4365	>	f.applyToEither(incomplete, x -> x);
4366		f.complete(null);
4367
4368		f = new CompletableFuture<>();
#	Line 4221 | Line 4376 | public class CompletableFutureTest exten
4376		f.complete(null);
4377
4378		f = new CompletableFuture<>();
4379	<	incomplete.acceptEither(f, (x) -> {});
4379	>	incomplete.acceptEither(f, x -> {});
4380		f.complete(null);
4381
4382		f = new CompletableFuture<>();
4383	<	incomplete.applyToEither(f, (x) -> x);
4383	>	incomplete.applyToEither(f, x -> x);
4384		f.complete(null);
4385
4386		f = new CompletableFuture<>();
#	Line 4234 | Line 4389 | public class CompletableFutureTest exten
4389		}
4390		}
4391
4392	<	/*
4393	<	* Tests below currently fail in stress mode due to memory retention.
4394	<	* ant -Dvmoptions=-Xmx8m -Djsr166.expensiveTests=true -Djsr166.tckTestClass=CompletableFutureTest tck
4392	>	/**
4393	>	* Reproduction recipe for:
4394	>	* 8160402: Garbage retention with CompletableFuture.anyOf
4395	>	* cvs update -D '2016-05-01' ./src/main/java/util/concurrent/CompletableFuture.java && ant -Dvmoptions=-Xmx8m -Djsr166.expensiveTests=true -Djsr166.tckTestClass=CompletableFutureTest -Djsr166.methodFilter=testAnyOfGarbageRetention tck; cvs update -A
4396		*/
4241	–
4242	–	/** Checks for garbage retention with anyOf. */
4397		public void testAnyOfGarbageRetention() throws Throwable {
4398		for (Integer v : new Integer[] { 1, null })
4399		{
#	Line 4253 | Line 4407 | public class CompletableFutureTest exten
4407		checkCompletedNormally(CompletableFuture.anyOf(fs), v);
4408		}}
4409
4410	<	/** Checks for garbage retention with allOf. */
4410	>	/**
4411	>	* Checks for garbage retention with allOf.
4412	>	*
4413	>	* As of 2016-07, fails with OOME:
4414	>	* ant -Dvmoptions=-Xmx8m -Djsr166.expensiveTests=true -Djsr166.tckTestClass=CompletableFutureTest -Djsr166.methodFilter=testCancelledAllOfGarbageRetention tck
4415	>	*/
4416		public void testCancelledAllOfGarbageRetention() throws Throwable {
4417		final int n = expensiveTests ? 100_000 : 10;
4418		CompletableFuture<Integer>[] fs
#	Line 4264 | Line 4423 | public class CompletableFutureTest exten
4423		assertTrue(CompletableFuture.allOf(fs).cancel(false));
4424		}
4425
4426	+	/**
4427	+	* Checks for garbage retention when a dependent future is
4428	+	* cancelled and garbage-collected.
4429	+	* 8161600: Garbage retention when source CompletableFutures are never completed
4430	+	*
4431	+	* As of 2016-07, fails with OOME:
4432	+	* ant -Dvmoptions=-Xmx8m -Djsr166.expensiveTests=true -Djsr166.tckTestClass=CompletableFutureTest -Djsr166.methodFilter=testCancelledGarbageRetention tck
4433	+	*/
4434	+	public void testCancelledGarbageRetention() throws Throwable {
4435	+	final int n = expensiveTests ? 100_000 : 10;
4436	+	CompletableFuture<Integer> neverCompleted = new CompletableFuture<>();
4437	+	for (int i = 0; i < n; i++)
4438	+	assertTrue(neverCompleted.thenRun(() -> {}).cancel(true));
4439	+	}
4440	+
4441	+	/**
4442	+	* Checks for garbage retention when MinimalStage.toCompletableFuture()
4443	+	* is invoked many times.
4444	+	* 8161600: Garbage retention when source CompletableFutures are never completed
4445	+	*
4446	+	* As of 2016-07, fails with OOME:
4447	+	* ant -Dvmoptions=-Xmx8m -Djsr166.expensiveTests=true -Djsr166.tckTestClass=CompletableFutureTest -Djsr166.methodFilter=testToCompletableFutureGarbageRetention tck
4448	+	*/
4449	+	public void testToCompletableFutureGarbageRetention() throws Throwable {
4450	+	final int n = expensiveTests ? 900_000 : 10;
4451	+	CompletableFuture<Integer> neverCompleted = new CompletableFuture<>();
4452	+	CompletionStage minimal = neverCompleted.minimalCompletionStage();
4453	+	for (int i = 0; i < n; i++)
4454	+	assertTrue(minimal.toCompletableFuture().cancel(true));
4455	+	}
4456	+
4457		//     static <U> U join(CompletionStage<U> stage) {
4458		//         CompletableFuture<U> f = new CompletableFuture<>();
4459		//         stage.whenComplete((v, ex) -> {

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