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Comparing jsr166/src/test/tck/CompletableFutureTest.java (file contents):
Revision 1.170 by jsr166, Mon Jul 18 19:30:49 2016 UTC vs.
Revision 1.197 by jsr166, Sun Jul 22 22:08:49 2018 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 42 | Line 41 | import java.util.function.Function;
41		import java.util.function.Predicate;
42		import java.util.function.Supplier;
43
45	–	import junit.framework.AssertionFailedError;
44		import junit.framework.Test;
45		import junit.framework.TestSuite;
46
#	Line 60 | Line 58 | public class CompletableFutureTest exten
58		void checkIncomplete(CompletableFuture<?> f) {
59		assertFalse(f.isDone());
60		assertFalse(f.isCancelled());
61	<	assertTrue(f.toString().contains("Not completed"));
61	>	assertTrue(f.toString().matches(".*\\[.*Not completed.*\\]"));
62	>
63	>	Object result = null;
64		try {
65	<	assertNull(f.getNow(null));
65	>	result = f.getNow(null);
66		} catch (Throwable fail) { threadUnexpectedException(fail); }
67	+	assertNull(result);
68	+
69		try {
70	<	f.get(0L, SECONDS);
70	>	f.get(randomExpiredTimeout(), randomTimeUnit());
71		shouldThrow();
72		}
73		catch (TimeoutException success) {}
74		catch (Throwable fail) { threadUnexpectedException(fail); }
75		}
76
77	<	<T> void checkCompletedNormally(CompletableFuture<T> f, T value) {
78	<	checkTimedGet(f, value);
77	>	<T> void checkCompletedNormally(CompletableFuture<T> f, T expectedValue) {
78	>	checkTimedGet(f, expectedValue);
79
80	+	assertEquals(expectedValue, f.join());
81	+	assertEquals(expectedValue, f.getNow(null));
82	+
83	+	T result = null;
84		try {
85	<	assertEquals(value, f.join());
80	<	} catch (Throwable fail) { threadUnexpectedException(fail); }
81	<	try {
82	<	assertEquals(value, f.getNow(null));
83	<	} catch (Throwable fail) { threadUnexpectedException(fail); }
84	<	try {
85	<	assertEquals(value, f.get());
85	>	result = f.get();
86		} catch (Throwable fail) { threadUnexpectedException(fail); }
87	+	assertEquals(expectedValue, result);
88	+
89		assertTrue(f.isDone());
90		assertFalse(f.isCancelled());
91		assertFalse(f.isCompletedExceptionally());
92	<	assertTrue(f.toString().contains("[Completed normally]"));
92	>	assertTrue(f.toString().matches(".*\\[.*Completed normally.*\\]"));
93		}
94
95		/**
96		* Returns the "raw" internal exceptional completion of f,
97		* without any additional wrapping with CompletionException.
98		*/
99	<	<U> Throwable exceptionalCompletion(CompletableFuture<U> f) {
100	<	// handle (and whenComplete) can distinguish between "direct"
101	<	// and "wrapped" exceptional completion
102	<	return f.handle((U u, Throwable t) -> t).join();
99	>	Throwable exceptionalCompletion(CompletableFuture<?> f) {
100	>	// handle (and whenComplete and exceptionally) can distinguish
101	>	// between "direct" and "wrapped" exceptional completion
102	>	return f.handle((u, t) -> t).join();
103		}
104
105		void checkCompletedExceptionally(CompletableFuture<?> f,
#	Line 143 | Line 145 | public class CompletableFutureTest exten
145		assertFalse(f.isCancelled());
146		assertTrue(f.isDone());
147		assertTrue(f.isCompletedExceptionally());
148	<	assertTrue(f.toString().contains("[Completed exceptionally]"));
148	>	assertTrue(f.toString().matches(".*\\[.*Completed exceptionally.*\\]"));
149		}
150
151		void checkCompletedWithWrappedCFException(CompletableFuture<?> f) {
152		checkCompletedExceptionally(f, true,
153	<	(t) -> assertTrue(t instanceof CFException));
153	>	t -> assertTrue(t instanceof CFException));
154		}
155
156		void checkCompletedWithWrappedCancellationException(CompletableFuture<?> f) {
157		checkCompletedExceptionally(f, true,
158	<	(t) -> assertTrue(t instanceof CancellationException));
158	>	t -> assertTrue(t instanceof CancellationException));
159		}
160
161		void checkCompletedWithTimeoutException(CompletableFuture<?> f) {
162		checkCompletedExceptionally(f, false,
163	<	(t) -> assertTrue(t instanceof TimeoutException));
163	>	t -> assertTrue(t instanceof TimeoutException));
164		}
165
166		void checkCompletedWithWrappedException(CompletableFuture<?> f,
167		Throwable ex) {
168	<	checkCompletedExceptionally(f, true, (t) -> assertSame(t, ex));
168	>	checkCompletedExceptionally(f, true, t -> assertSame(t, ex));
169		}
170
171		void checkCompletedExceptionally(CompletableFuture<?> f, Throwable ex) {
172	<	checkCompletedExceptionally(f, false, (t) -> assertSame(t, ex));
172	>	checkCompletedExceptionally(f, false, t -> assertSame(t, ex));
173		}
174
175		void checkCancelled(CompletableFuture<?> f) {
#	Line 198 | Line 200 | public class CompletableFutureTest exten
200		assertTrue(f.isDone());
201		assertTrue(f.isCompletedExceptionally());
202		assertTrue(f.isCancelled());
203	<	assertTrue(f.toString().contains("[Completed exceptionally]"));
203	>	assertTrue(f.toString().matches(".*\\[.*Completed exceptionally.*\\]"));
204		}
205
206		/**
#	Line 297 | Line 299 | public class CompletableFutureTest exten
299		}
300
301		f = new CompletableFuture<>();
302	<	f.completeExceptionally(ex = new CFException());
302	>	f.completeExceptionally(new CFException());
303		f.obtrudeValue(v1);
304		checkCompletedNormally(f, v1);
305		f.obtrudeException(ex = new CFException());
#	Line 334 | Line 336 | public class CompletableFutureTest exten
336		/**
337		* toString indicates current completion state
338		*/
339	<	public void testToString() {
340	<	CompletableFuture<String> f;
341	<
342	<	f = new CompletableFuture<String>();
343	<	assertTrue(f.toString().contains("[Not completed]"));
339	>	public void testToString_incomplete() {
340	>	CompletableFuture<String> f = new CompletableFuture<>();
341	>	assertTrue(f.toString().matches(".*\\[.*Not completed.*\\]"));
342	>	if (testImplementationDetails)
343	>	assertEquals(identityString(f) + "[Not completed]",
344	>	f.toString());
345	>	}
346
347	+	public void testToString_normal() {
348	+	CompletableFuture<String> f = new CompletableFuture<>();
349		assertTrue(f.complete("foo"));
350	<	assertTrue(f.toString().contains("[Completed normally]"));
350	>	assertTrue(f.toString().matches(".*\\[.*Completed normally.*\\]"));
351	>	if (testImplementationDetails)
352	>	assertEquals(identityString(f) + "[Completed normally]",
353	>	f.toString());
354	>	}
355
356	<	f = new CompletableFuture<String>();
356	>	public void testToString_exception() {
357	>	CompletableFuture<String> f = new CompletableFuture<>();
358		assertTrue(f.completeExceptionally(new IndexOutOfBoundsException()));
359	<	assertTrue(f.toString().contains("[Completed exceptionally]"));
359	>	assertTrue(f.toString().matches(".*\\[.*Completed exceptionally.*\\]"));
360	>	if (testImplementationDetails)
361	>	assertTrue(f.toString().startsWith(
362	>	identityString(f) + "[Completed exceptionally: "));
363	>	}
364
365	+	public void testToString_cancelled() {
366		for (boolean mayInterruptIfRunning : new boolean[] { true, false }) {
367	<	f = new CompletableFuture<String>();
367	>	CompletableFuture<String> f = new CompletableFuture<>();
368		assertTrue(f.cancel(mayInterruptIfRunning));
369	<	assertTrue(f.toString().contains("[Completed exceptionally]"));
369	>	assertTrue(f.toString().matches(".*\\[.*Completed exceptionally.*\\]"));
370	>	if (testImplementationDetails)
371	>	assertTrue(f.toString().startsWith(
372	>	identityString(f) + "[Completed exceptionally: "));
373		}
374		}
375
#	Line 362 | Line 381 | public class CompletableFutureTest exten
381		checkCompletedNormally(f, "test");
382		}
383
384	<	abstract class CheckedAction {
384	>	abstract static class CheckedAction {
385		int invocationCount = 0;
386		final ExecutionMode m;
387		CheckedAction(ExecutionMode m) { this.m = m; }
#	Line 374 | Line 393 | public class CompletableFutureTest exten
393		void assertInvoked() { assertEquals(1, invocationCount); }
394		}
395
396	<	abstract class CheckedIntegerAction extends CheckedAction {
396	>	abstract static class CheckedIntegerAction extends CheckedAction {
397		Integer value;
398		CheckedIntegerAction(ExecutionMode m) { super(m); }
399		void assertValue(Integer expected) {
#	Line 383 | Line 402 | public class CompletableFutureTest exten
402		}
403		}
404
405	<	class IntegerSupplier extends CheckedAction
405	>	static class IntegerSupplier extends CheckedAction
406		implements Supplier<Integer>
407		{
408		final Integer value;
#	Line 402 | Line 421 | public class CompletableFutureTest exten
421		return (x == null) ? null : x + 1;
422		}
423
424	<	class NoopConsumer extends CheckedIntegerAction
424	>	static class NoopConsumer extends CheckedIntegerAction
425		implements Consumer<Integer>
426		{
427		NoopConsumer(ExecutionMode m) { super(m); }
#	Line 412 | Line 431 | public class CompletableFutureTest exten
431		}
432		}
433
434	<	class IncFunction extends CheckedIntegerAction
434	>	static class IncFunction extends CheckedIntegerAction
435		implements Function<Integer,Integer>
436		{
437		IncFunction(ExecutionMode m) { super(m); }
#	Line 430 | Line 449 | public class CompletableFutureTest exten
449		- ((y == null) ? 99 : y.intValue());
450		}
451
452	<	class SubtractAction extends CheckedIntegerAction
452	>	static class SubtractAction extends CheckedIntegerAction
453		implements BiConsumer<Integer, Integer>
454		{
455		SubtractAction(ExecutionMode m) { super(m); }
#	Line 440 | Line 459 | public class CompletableFutureTest exten
459		}
460		}
461
462	<	class SubtractFunction extends CheckedIntegerAction
462	>	static class SubtractFunction extends CheckedIntegerAction
463		implements BiFunction<Integer, Integer, Integer>
464		{
465		SubtractFunction(ExecutionMode m) { super(m); }
#	Line 450 | Line 469 | public class CompletableFutureTest exten
469		}
470		}
471
472	<	class Noop extends CheckedAction implements Runnable {
472	>	static class Noop extends CheckedAction implements Runnable {
473		Noop(ExecutionMode m) { super(m); }
474		public void run() {
475		invoked();
476		}
477		}
478
479	<	class FailingSupplier extends CheckedAction
479	>	static class FailingSupplier extends CheckedAction
480		implements Supplier<Integer>
481		{
482		final CFException ex;
#	Line 468 | Line 487 | public class CompletableFutureTest exten
487		}
488		}
489
490	<	class FailingConsumer extends CheckedIntegerAction
490	>	static class FailingConsumer extends CheckedIntegerAction
491		implements Consumer<Integer>
492		{
493		final CFException ex;
#	Line 480 | Line 499 | public class CompletableFutureTest exten
499		}
500		}
501
502	<	class FailingBiConsumer extends CheckedIntegerAction
502	>	static class FailingBiConsumer extends CheckedIntegerAction
503		implements BiConsumer<Integer, Integer>
504		{
505		final CFException ex;
#	Line 492 | Line 511 | public class CompletableFutureTest exten
511		}
512		}
513
514	<	class FailingFunction extends CheckedIntegerAction
514	>	static class FailingFunction extends CheckedIntegerAction
515		implements Function<Integer, Integer>
516		{
517		final CFException ex;
#	Line 504 | Line 523 | public class CompletableFutureTest exten
523		}
524		}
525
526	<	class FailingBiFunction extends CheckedIntegerAction
526	>	static class FailingBiFunction extends CheckedIntegerAction
527		implements BiFunction<Integer, Integer, Integer>
528		{
529		final CFException ex;
#	Line 516 | Line 535 | public class CompletableFutureTest exten
535		}
536		}
537
538	<	class FailingRunnable extends CheckedAction implements Runnable {
538	>	static class FailingRunnable extends CheckedAction implements Runnable {
539		final CFException ex;
540		FailingRunnable(ExecutionMode m) { super(m); ex = new CFException(); }
541		public void run() {
#	Line 525 | Line 544 | public class CompletableFutureTest exten
544		}
545		}
546
547	<	class CompletableFutureInc extends CheckedIntegerAction
547	>	static class CompletableFutureInc extends CheckedIntegerAction
548		implements Function<Integer, CompletableFuture<Integer>>
549		{
550		CompletableFutureInc(ExecutionMode m) { super(m); }
#	Line 538 | Line 557 | public class CompletableFutureTest exten
557		}
558		}
559
560	<	class FailingCompletableFutureFunction extends CheckedIntegerAction
560	>	static class FailingCompletableFutureFunction extends CheckedIntegerAction
561		implements Function<Integer, CompletableFuture<Integer>>
562		{
563		final CFException ex;
#	Line 1243 | Line 1262 | public class CompletableFutureTest exten
1262		r.assertInvoked();
1263		}}
1264
1265	+	@SuppressWarnings("FutureReturnValueIgnored")
1266		public void testRunAsync_rejectingExecutor() {
1267		CountingRejectingExecutor e = new CountingRejectingExecutor();
1268		try {
#	Line 1289 | Line 1309 | public class CompletableFutureTest exten
1309		r.assertInvoked();
1310		}}
1311
1312	+	@SuppressWarnings("FutureReturnValueIgnored")
1313		public void testSupplyAsync_rejectingExecutor() {
1314		CountingRejectingExecutor e = new CountingRejectingExecutor();
1315		try {
#	Line 2563 | Line 2584 | public class CompletableFutureTest exten
2584
2585		// unspecified behavior - both source completions available
2586		try {
2587	<	assertEquals(null, h0.join());
2587	>	assertNull(h0.join());
2588		rs[0].assertValue(v1);
2589		} catch (CompletionException ok) {
2590		checkCompletedWithWrappedException(h0, ex);
2591		rs[0].assertNotInvoked();
2592		}
2593		try {
2594	<	assertEquals(null, h1.join());
2594	>	assertNull(h1.join());
2595		rs[1].assertValue(v1);
2596		} catch (CompletionException ok) {
2597		checkCompletedWithWrappedException(h1, ex);
2598		rs[1].assertNotInvoked();
2599		}
2600		try {
2601	<	assertEquals(null, h2.join());
2601	>	assertNull(h2.join());
2602		rs[2].assertValue(v1);
2603		} catch (CompletionException ok) {
2604		checkCompletedWithWrappedException(h2, ex);
2605		rs[2].assertNotInvoked();
2606		}
2607		try {
2608	<	assertEquals(null, h3.join());
2608	>	assertNull(h3.join());
2609		rs[3].assertValue(v1);
2610		} catch (CompletionException ok) {
2611		checkCompletedWithWrappedException(h3, ex);
#	Line 2823 | Line 2844 | public class CompletableFutureTest exten
2844
2845		// unspecified behavior - both source completions available
2846		try {
2847	<	assertEquals(null, h0.join());
2847	>	assertNull(h0.join());
2848		rs[0].assertInvoked();
2849		} catch (CompletionException ok) {
2850		checkCompletedWithWrappedException(h0, ex);
2851		rs[0].assertNotInvoked();
2852		}
2853		try {
2854	<	assertEquals(null, h1.join());
2854	>	assertNull(h1.join());
2855		rs[1].assertInvoked();
2856		} catch (CompletionException ok) {
2857		checkCompletedWithWrappedException(h1, ex);
2858		rs[1].assertNotInvoked();
2859		}
2860		try {
2861	<	assertEquals(null, h2.join());
2861	>	assertNull(h2.join());
2862		rs[2].assertInvoked();
2863		} catch (CompletionException ok) {
2864		checkCompletedWithWrappedException(h2, ex);
2865		rs[2].assertNotInvoked();
2866		}
2867		try {
2868	<	assertEquals(null, h3.join());
2868	>	assertNull(h3.join());
2869		rs[3].assertInvoked();
2870		} catch (CompletionException ok) {
2871		checkCompletedWithWrappedException(h3, ex);
#	Line 3239 | Line 3260 | public class CompletableFutureTest exten
3260		/**
3261		* Completion methods throw NullPointerException with null arguments
3262		*/
3263	+	@SuppressWarnings("FutureReturnValueIgnored")
3264		public void testNPE() {
3265		CompletableFuture<Integer> f = new CompletableFuture<>();
3266		CompletableFuture<Integer> g = new CompletableFuture<>();
#	Line 3258 | Line 3280 | public class CompletableFutureTest exten
3280
3281		() -> f.thenApply(null),
3282		() -> f.thenApplyAsync(null),
3283	<	() -> f.thenApplyAsync((x) -> x, null),
3283	>	() -> f.thenApplyAsync(x -> x, null),
3284		() -> f.thenApplyAsync(null, exec),
3285
3286		() -> f.thenAccept(null),
3287		() -> f.thenAcceptAsync(null),
3288	<	() -> f.thenAcceptAsync((x) -> {} , null),
3288	>	() -> f.thenAcceptAsync(x -> {} , null),
3289		() -> f.thenAcceptAsync(null, exec),
3290
3291		() -> f.thenRun(null),
#	Line 3298 | Line 3320 | public class CompletableFutureTest exten
3320		() -> f.applyToEither(g, null),
3321		() -> f.applyToEitherAsync(g, null),
3322		() -> f.applyToEitherAsync(g, null, exec),
3323	<	() -> f.applyToEither(nullFuture, (x) -> x),
3324	<	() -> f.applyToEitherAsync(nullFuture, (x) -> x),
3325	<	() -> f.applyToEitherAsync(nullFuture, (x) -> x, exec),
3326	<	() -> f.applyToEitherAsync(g, (x) -> x, null),
3323	>	() -> f.applyToEither(nullFuture, x -> x),
3324	>	() -> f.applyToEitherAsync(nullFuture, x -> x),
3325	>	() -> f.applyToEitherAsync(nullFuture, x -> x, exec),
3326	>	() -> f.applyToEitherAsync(g, x -> x, null),
3327
3328		() -> f.acceptEither(g, null),
3329		() -> f.acceptEitherAsync(g, null),
3330		() -> f.acceptEitherAsync(g, null, exec),
3331	<	() -> f.acceptEither(nullFuture, (x) -> {}),
3332	<	() -> f.acceptEitherAsync(nullFuture, (x) -> {}),
3333	<	() -> f.acceptEitherAsync(nullFuture, (x) -> {}, exec),
3334	<	() -> f.acceptEitherAsync(g, (x) -> {}, null),
3331	>	() -> f.acceptEither(nullFuture, x -> {}),
3332	>	() -> f.acceptEitherAsync(nullFuture, x -> {}),
3333	>	() -> f.acceptEitherAsync(nullFuture, x -> {}, exec),
3334	>	() -> f.acceptEitherAsync(g, x -> {}, null),
3335
3336		() -> f.runAfterEither(g, null),
3337		() -> f.runAfterEitherAsync(g, null),
#	Line 3375 | Line 3397 | public class CompletableFutureTest exten
3397		for (CompletableFuture<Integer> src : srcs) {
3398		List<CompletableFuture<?>> fs = new ArrayList<>();
3399		fs.add(src.thenRunAsync(() -> {}, e));
3400	<	fs.add(src.thenAcceptAsync((z) -> {}, e));
3401	<	fs.add(src.thenApplyAsync((z) -> z, e));
3400	>	fs.add(src.thenAcceptAsync(z -> {}, e));
3401	>	fs.add(src.thenApplyAsync(z -> z, e));
3402
3403		fs.add(src.thenCombineAsync(src, (x, y) -> x, e));
3404		fs.add(src.thenAcceptBothAsync(src, (x, y) -> {}, e));
3405		fs.add(src.runAfterBothAsync(src, () -> {}, e));
3406
3407	<	fs.add(src.applyToEitherAsync(src, (z) -> z, e));
3408	<	fs.add(src.acceptEitherAsync(src, (z) -> {}, e));
3407	>	fs.add(src.applyToEitherAsync(src, z -> z, e));
3408	>	fs.add(src.acceptEitherAsync(src, z -> {}, e));
3409		fs.add(src.runAfterEitherAsync(src, () -> {}, e));
3410
3411	<	fs.add(src.thenComposeAsync((z) -> null, e));
3411	>	fs.add(src.thenComposeAsync(z -> null, e));
3412		fs.add(src.whenCompleteAsync((z, t) -> {}, e));
3413		fs.add(src.handleAsync((z, t) -> null, e));
3414
#	Line 3419 | Line 3441 | public class CompletableFutureTest exten
3441		{
3442		List<CompletableFuture<?>> fs = new ArrayList<>();
3443
3444	<	fs.add(complete.applyToEitherAsync(incomplete, (z) -> z, e));
3445	<	fs.add(incomplete.applyToEitherAsync(complete, (z) -> z, e));
3444	>	fs.add(complete.applyToEitherAsync(incomplete, z -> z, e));
3445	>	fs.add(incomplete.applyToEitherAsync(complete, z -> z, e));
3446
3447	<	fs.add(complete.acceptEitherAsync(incomplete, (z) -> {}, e));
3448	<	fs.add(incomplete.acceptEitherAsync(complete, (z) -> {}, e));
3447	>	fs.add(complete.acceptEitherAsync(incomplete, z -> {}, e));
3448	>	fs.add(incomplete.acceptEitherAsync(complete, z -> {}, e));
3449
3450		fs.add(complete.runAfterEitherAsync(incomplete, () -> {}, e));
3451		fs.add(incomplete.runAfterEitherAsync(complete, () -> {}, e));
#	Line 3462 | Line 3484 | public class CompletableFutureTest exten
3484
3485		List<CompletableFuture<?>> fs = new ArrayList<>();
3486		fs.add(incomplete.thenRunAsync(() -> {}, e));
3487	<	fs.add(incomplete.thenAcceptAsync((z) -> {}, e));
3488	<	fs.add(incomplete.thenApplyAsync((z) -> z, e));
3487	>	fs.add(incomplete.thenAcceptAsync(z -> {}, e));
3488	>	fs.add(incomplete.thenApplyAsync(z -> z, e));
3489
3490		fs.add(incomplete.thenCombineAsync(incomplete, (x, y) -> x, e));
3491		fs.add(incomplete.thenAcceptBothAsync(incomplete, (x, y) -> {}, e));
3492		fs.add(incomplete.runAfterBothAsync(incomplete, () -> {}, e));
3493
3494	<	fs.add(incomplete.applyToEitherAsync(incomplete, (z) -> z, e));
3495	<	fs.add(incomplete.acceptEitherAsync(incomplete, (z) -> {}, e));
3494	>	fs.add(incomplete.applyToEitherAsync(incomplete, z -> z, e));
3495	>	fs.add(incomplete.acceptEitherAsync(incomplete, z -> {}, e));
3496		fs.add(incomplete.runAfterEitherAsync(incomplete, () -> {}, e));
3497
3498	<	fs.add(incomplete.thenComposeAsync((z) -> null, e));
3498	>	fs.add(incomplete.thenComposeAsync(z -> null, e));
3499		fs.add(incomplete.whenCompleteAsync((z, t) -> {}, e));
3500		fs.add(incomplete.handleAsync((z, t) -> null, e));
3501
#	Line 3533 | Line 3555 | public class CompletableFutureTest exten
3555		*/
3556		public void testCompletedStage() {
3557		AtomicInteger x = new AtomicInteger(0);
3558	<	AtomicReference<Throwable> r = new AtomicReference<Throwable>();
3558	>	AtomicReference<Throwable> r = new AtomicReference<>();
3559		CompletionStage<Integer> f = CompletableFuture.completedStage(1);
3560		f.whenComplete((v, e) -> {if (e != null) r.set(e); else x.set(v);});
3561		assertEquals(x.get(), 1);
#	Line 3578 | Line 3600 | public class CompletableFutureTest exten
3600		* copy returns a CompletableFuture that is completed normally,
3601		* with the same value, when source is.
3602		*/
3603	<	public void testCopy() {
3603	>	public void testCopy_normalCompletion() {
3604	>	for (boolean createIncomplete : new boolean[] { true, false })
3605	>	for (Integer v1 : new Integer[] { 1, null })
3606	>	{
3607		CompletableFuture<Integer> f = new CompletableFuture<>();
3608	+	if (!createIncomplete) assertTrue(f.complete(v1));
3609		CompletableFuture<Integer> g = f.copy();
3610	<	checkIncomplete(f);
3611	<	checkIncomplete(g);
3612	<	f.complete(1);
3613	<	checkCompletedNormally(f, 1);
3614	<	checkCompletedNormally(g, 1);
3615	<	}
3610	>	if (createIncomplete) {
3611	>	checkIncomplete(f);
3612	>	checkIncomplete(g);
3613	>	assertTrue(f.complete(v1));
3614	>	}
3615	>	checkCompletedNormally(f, v1);
3616	>	checkCompletedNormally(g, v1);
3617	>	}}
3618
3619		/**
3620		* copy returns a CompletableFuture that is completed exceptionally
3621		* when source is.
3622		*/
3623	<	public void testCopy2() {
3623	>	public void testCopy_exceptionalCompletion() {
3624	>	for (boolean createIncomplete : new boolean[] { true, false })
3625	>	{
3626	>	CFException ex = new CFException();
3627		CompletableFuture<Integer> f = new CompletableFuture<>();
3628	+	if (!createIncomplete) f.completeExceptionally(ex);
3629		CompletableFuture<Integer> g = f.copy();
3630	<	checkIncomplete(f);
3631	<	checkIncomplete(g);
3632	<	CFException ex = new CFException();
3633	<	f.completeExceptionally(ex);
3630	>	if (createIncomplete) {
3631	>	checkIncomplete(f);
3632	>	checkIncomplete(g);
3633	>	f.completeExceptionally(ex);
3634	>	}
3635		checkCompletedExceptionally(f, ex);
3636		checkCompletedWithWrappedException(g, ex);
3637	+	}}
3638	+
3639	+	/**
3640	+	* Completion of a copy does not complete its source.
3641	+	*/
3642	+	public void testCopy_oneWayPropagation() {
3643	+	CompletableFuture<Integer> f = new CompletableFuture<>();
3644	+	assertTrue(f.copy().complete(1));
3645	+	assertTrue(f.copy().complete(null));
3646	+	assertTrue(f.copy().cancel(true));
3647	+	assertTrue(f.copy().cancel(false));
3648	+	assertTrue(f.copy().completeExceptionally(new CFException()));
3649	+	checkIncomplete(f);
3650		}
3651
3652		/**
#	Line 3611 | Line 3657 | public class CompletableFutureTest exten
3657		CompletableFuture<Integer> f = new CompletableFuture<>();
3658		CompletionStage<Integer> g = f.minimalCompletionStage();
3659		AtomicInteger x = new AtomicInteger(0);
3660	<	AtomicReference<Throwable> r = new AtomicReference<Throwable>();
3660	>	AtomicReference<Throwable> r = new AtomicReference<>();
3661		checkIncomplete(f);
3662		g.whenComplete((v, e) -> {if (e != null) r.set(e); else x.set(v);});
3663		f.complete(1);
#	Line 3628 | Line 3674 | public class CompletableFutureTest exten
3674		CompletableFuture<Integer> f = new CompletableFuture<>();
3675		CompletionStage<Integer> g = f.minimalCompletionStage();
3676		AtomicInteger x = new AtomicInteger(0);
3677	<	AtomicReference<Throwable> r = new AtomicReference<Throwable>();
3677	>	AtomicReference<Throwable> r = new AtomicReference<>();
3678		g.whenComplete((v, e) -> {if (e != null) r.set(e); else x.set(v);});
3679		checkIncomplete(f);
3680		CFException ex = new CFException();
#	Line 3646 | Line 3692 | public class CompletableFutureTest exten
3692		CFException ex = new CFException();
3693		CompletionStage<Integer> f = CompletableFuture.failedStage(ex);
3694		AtomicInteger x = new AtomicInteger(0);
3695	<	AtomicReference<Throwable> r = new AtomicReference<Throwable>();
3695	>	AtomicReference<Throwable> r = new AtomicReference<>();
3696		f.whenComplete((v, e) -> {if (e != null) r.set(e); else x.set(v);});
3697		assertEquals(x.get(), 0);
3698		assertEquals(r.get(), ex);
#	Line 3670 | Line 3716 | public class CompletableFutureTest exten
3716		public void testCompleteAsync2() {
3717		CompletableFuture<Integer> f = new CompletableFuture<>();
3718		CFException ex = new CFException();
3719	<	f.completeAsync(() -> {if (true) throw ex; return 1;});
3719	>	f.completeAsync(() -> { throw ex; });
3720		try {
3721		f.join();
3722		shouldThrow();
#	Line 3700 | Line 3746 | public class CompletableFutureTest exten
3746		CompletableFuture<Integer> f = new CompletableFuture<>();
3747		CFException ex = new CFException();
3748		ThreadExecutor executor = new ThreadExecutor();
3749	<	f.completeAsync(() -> {if (true) throw ex; return 1;}, executor);
3749	>	f.completeAsync(() -> { throw ex; }, executor);
3750		try {
3751		f.join();
3752		shouldThrow();
#	Line 3859 | Line 3905 | public class CompletableFutureTest exten
3905		List<Function<CompletableFuture<Integer>, CompletableFuture<?>>> funs
3906		= new ArrayList<>();
3907
3908	<	funs.add((y) -> m.thenRun(y, noopRunnable));
3909	<	funs.add((y) -> m.thenAccept(y, noopConsumer));
3910	<	funs.add((y) -> m.thenApply(y, incFunction));
3911	<
3912	<	funs.add((y) -> m.runAfterEither(y, incomplete, noopRunnable));
3913	<	funs.add((y) -> m.acceptEither(y, incomplete, noopConsumer));
3914	<	funs.add((y) -> m.applyToEither(y, incomplete, incFunction));
3915	<
3916	<	funs.add((y) -> m.runAfterBoth(y, v42, noopRunnable));
3917	<	funs.add((y) -> m.runAfterBoth(v42, y, noopRunnable));
3918	<	funs.add((y) -> m.thenAcceptBoth(y, v42, new SubtractAction(m)));
3919	<	funs.add((y) -> m.thenAcceptBoth(v42, y, new SubtractAction(m)));
3920	<	funs.add((y) -> m.thenCombine(y, v42, new SubtractFunction(m)));
3921	<	funs.add((y) -> m.thenCombine(v42, y, new SubtractFunction(m)));
3922	<
3923	<	funs.add((y) -> m.whenComplete(y, (Integer r, Throwable t) -> {}));
3924	<
3925	<	funs.add((y) -> m.thenCompose(y, new CompletableFutureInc(m)));
3926	<
3927	<	funs.add((y) -> CompletableFuture.allOf(y));
3928	<	funs.add((y) -> CompletableFuture.allOf(y, v42));
3929	<	funs.add((y) -> CompletableFuture.allOf(v42, y));
3930	<	funs.add((y) -> CompletableFuture.anyOf(y));
3931	<	funs.add((y) -> CompletableFuture.anyOf(y, incomplete));
3932	<	funs.add((y) -> CompletableFuture.anyOf(incomplete, y));
3908	>	funs.add(y -> m.thenRun(y, noopRunnable));
3909	>	funs.add(y -> m.thenAccept(y, noopConsumer));
3910	>	funs.add(y -> m.thenApply(y, incFunction));
3911	>
3912	>	funs.add(y -> m.runAfterEither(y, incomplete, noopRunnable));
3913	>	funs.add(y -> m.acceptEither(y, incomplete, noopConsumer));
3914	>	funs.add(y -> m.applyToEither(y, incomplete, incFunction));
3915	>
3916	>	funs.add(y -> m.runAfterBoth(y, v42, noopRunnable));
3917	>	funs.add(y -> m.runAfterBoth(v42, y, noopRunnable));
3918	>	funs.add(y -> m.thenAcceptBoth(y, v42, new SubtractAction(m)));
3919	>	funs.add(y -> m.thenAcceptBoth(v42, y, new SubtractAction(m)));
3920	>	funs.add(y -> m.thenCombine(y, v42, new SubtractFunction(m)));
3921	>	funs.add(y -> m.thenCombine(v42, y, new SubtractFunction(m)));
3922	>
3923	>	funs.add(y -> m.whenComplete(y, (Integer r, Throwable t) -> {}));
3924	>
3925	>	funs.add(y -> m.thenCompose(y, new CompletableFutureInc(m)));
3926	>
3927	>	funs.add(y -> CompletableFuture.allOf(y));
3928	>	funs.add(y -> CompletableFuture.allOf(y, v42));
3929	>	funs.add(y -> CompletableFuture.allOf(v42, y));
3930	>	funs.add(y -> CompletableFuture.anyOf(y));
3931	>	funs.add(y -> CompletableFuture.anyOf(y, incomplete));
3932	>	funs.add(y -> CompletableFuture.anyOf(incomplete, y));
3933
3934		for (Function<CompletableFuture<Integer>, CompletableFuture<?>>
3935		fun : funs) {
#	Line 3940 | Line 3986 | public class CompletableFutureTest exten
3986		public void testMinimalCompletionStage_minimality() {
3987		if (!testImplementationDetails) return;
3988		Function<Method, String> toSignature =
3989	<	(method) -> method.getName() + Arrays.toString(method.getParameterTypes());
3989	>	method -> method.getName() + Arrays.toString(method.getParameterTypes());
3990		Predicate<Method> isNotStatic =
3991	<	(method) -> (method.getModifiers() & Modifier.STATIC) == 0;
3991	>	method -> (method.getModifiers() & Modifier.STATIC) == 0;
3992		List<Method> minimalMethods =
3993		Stream.of(Object.class, CompletionStage.class)
3994	<	.flatMap((klazz) -> Stream.of(klazz.getMethods()))
3994	>	.flatMap(klazz -> Stream.of(klazz.getMethods()))
3995		.filter(isNotStatic)
3996		.collect(Collectors.toList());
3997		// Methods from CompletableFuture permitted NOT to throw UOE
#	Line 3961 | Line 4007 | public class CompletableFutureTest exten
4007		.collect(Collectors.toSet());
4008		List<Method> allMethods = Stream.of(CompletableFuture.class.getMethods())
4009		.filter(isNotStatic)
4010	<	.filter((method) -> !permittedMethodSignatures.contains(toSignature.apply(method)))
4010	>	.filter(method -> !permittedMethodSignatures.contains(toSignature.apply(method)))
4011		.collect(Collectors.toList());
4012
4013		List<CompletionStage<Integer>> stages = new ArrayList<>();
4014	<	stages.add(new CompletableFuture<Integer>().minimalCompletionStage());
4014	>	CompletionStage<Integer> min =
4015	>	new CompletableFuture<Integer>().minimalCompletionStage();
4016	>	stages.add(min);
4017	>	stages.add(min.thenApply(x -> x));
4018		stages.add(CompletableFuture.completedStage(1));
4019		stages.add(CompletableFuture.failedStage(new CFException()));
4020
#	Line 4001 | Line 4050 | public class CompletableFutureTest exten
4050		throw new Error("Methods did not throw UOE: " + bugs);
4051		}
4052
4053	+	/**
4054	+	* minimalStage.toCompletableFuture() returns a CompletableFuture that
4055	+	* is completed normally, with the same value, when source is.
4056	+	*/
4057	+	public void testMinimalCompletionStage_toCompletableFuture_normalCompletion() {
4058	+	for (boolean createIncomplete : new boolean[] { true, false })
4059	+	for (Integer v1 : new Integer[] { 1, null })
4060	+	{
4061	+	CompletableFuture<Integer> f = new CompletableFuture<>();
4062	+	CompletionStage<Integer> minimal = f.minimalCompletionStage();
4063	+	if (!createIncomplete) assertTrue(f.complete(v1));
4064	+	CompletableFuture<Integer> g = minimal.toCompletableFuture();
4065	+	if (createIncomplete) {
4066	+	checkIncomplete(f);
4067	+	checkIncomplete(g);
4068	+	assertTrue(f.complete(v1));
4069	+	}
4070	+	checkCompletedNormally(f, v1);
4071	+	checkCompletedNormally(g, v1);
4072	+	}}
4073	+
4074	+	/**
4075	+	* minimalStage.toCompletableFuture() returns a CompletableFuture that
4076	+	* is completed exceptionally when source is.
4077	+	*/
4078	+	public void testMinimalCompletionStage_toCompletableFuture_exceptionalCompletion() {
4079	+	for (boolean createIncomplete : new boolean[] { true, false })
4080	+	{
4081	+	CFException ex = new CFException();
4082	+	CompletableFuture<Integer> f = new CompletableFuture<>();
4083	+	CompletionStage<Integer> minimal = f.minimalCompletionStage();
4084	+	if (!createIncomplete) f.completeExceptionally(ex);
4085	+	CompletableFuture<Integer> g = minimal.toCompletableFuture();
4086	+	if (createIncomplete) {
4087	+	checkIncomplete(f);
4088	+	checkIncomplete(g);
4089	+	f.completeExceptionally(ex);
4090	+	}
4091	+	checkCompletedExceptionally(f, ex);
4092	+	checkCompletedWithWrappedException(g, ex);
4093	+	}}
4094	+
4095	+	/**
4096	+	* minimalStage.toCompletableFuture() gives mutable CompletableFuture
4097	+	*/
4098	+	public void testMinimalCompletionStage_toCompletableFuture_mutable() {
4099	+	for (Integer v1 : new Integer[] { 1, null })
4100	+	{
4101	+	CompletableFuture<Integer> f = new CompletableFuture<>();
4102	+	CompletionStage minimal = f.minimalCompletionStage();
4103	+	CompletableFuture<Integer> g = minimal.toCompletableFuture();
4104	+	assertTrue(g.complete(v1));
4105	+	checkCompletedNormally(g, v1);
4106	+	checkIncomplete(f);
4107	+	checkIncomplete(minimal.toCompletableFuture());
4108	+	}}
4109	+
4110	+	/**
4111	+	* minimalStage.toCompletableFuture().join() awaits completion
4112	+	*/
4113	+	public void testMinimalCompletionStage_toCompletableFuture_join() throws Exception {
4114	+	for (boolean createIncomplete : new boolean[] { true, false })
4115	+	for (Integer v1 : new Integer[] { 1, null })
4116	+	{
4117	+	CompletableFuture<Integer> f = new CompletableFuture<>();
4118	+	if (!createIncomplete) assertTrue(f.complete(v1));
4119	+	CompletionStage<Integer> minimal = f.minimalCompletionStage();
4120	+	if (createIncomplete) assertTrue(f.complete(v1));
4121	+	assertEquals(v1, minimal.toCompletableFuture().join());
4122	+	assertEquals(v1, minimal.toCompletableFuture().get());
4123	+	checkCompletedNormally(minimal.toCompletableFuture(), v1);
4124	+	}}
4125	+
4126	+	/**
4127	+	* Completion of a toCompletableFuture copy of a minimal stage
4128	+	* does not complete its source.
4129	+	*/
4130	+	public void testMinimalCompletionStage_toCompletableFuture_oneWayPropagation() {
4131	+	CompletableFuture<Integer> f = new CompletableFuture<>();
4132	+	CompletionStage<Integer> g = f.minimalCompletionStage();
4133	+	assertTrue(g.toCompletableFuture().complete(1));
4134	+	assertTrue(g.toCompletableFuture().complete(null));
4135	+	assertTrue(g.toCompletableFuture().cancel(true));
4136	+	assertTrue(g.toCompletableFuture().cancel(false));
4137	+	assertTrue(g.toCompletableFuture().completeExceptionally(new CFException()));
4138	+	checkIncomplete(g.toCompletableFuture());
4139	+	f.complete(1);
4140	+	checkCompletedNormally(g.toCompletableFuture(), 1);
4141	+	}
4142	+
4143	+	/** Demo utility method for external reliable toCompletableFuture */
4144	+	static <T> CompletableFuture<T> toCompletableFuture(CompletionStage<T> stage) {
4145	+	CompletableFuture<T> f = new CompletableFuture<>();
4146	+	stage.handle((T t, Throwable ex) -> {
4147	+	if (ex != null) f.completeExceptionally(ex);
4148	+	else f.complete(t);
4149	+	return null;
4150	+	});
4151	+	return f;
4152	+	}
4153	+
4154	+	/** Demo utility method to join a CompletionStage */
4155	+	static <T> T join(CompletionStage<T> stage) {
4156	+	return toCompletableFuture(stage).join();
4157	+	}
4158	+
4159	+	/**
4160	+	* Joining a minimal stage "by hand" works
4161	+	*/
4162	+	public void testMinimalCompletionStage_join_by_hand() {
4163	+	for (boolean createIncomplete : new boolean[] { true, false })
4164	+	for (Integer v1 : new Integer[] { 1, null })
4165	+	{
4166	+	CompletableFuture<Integer> f = new CompletableFuture<>();
4167	+	CompletionStage<Integer> minimal = f.minimalCompletionStage();
4168	+	CompletableFuture<Integer> g = new CompletableFuture<>();
4169	+	if (!createIncomplete) assertTrue(f.complete(v1));
4170	+	minimal.thenAccept(x -> g.complete(x));
4171	+	if (createIncomplete) assertTrue(f.complete(v1));
4172	+	g.join();
4173	+	checkCompletedNormally(g, v1);
4174	+	checkCompletedNormally(f, v1);
4175	+	assertEquals(v1, join(minimal));
4176	+	}}
4177	+
4178		static class Monad {
4179		static class ZeroException extends RuntimeException {
4180		public ZeroException() { super("monadic zero"); }
#	Line 4017 | Line 4191 | public class CompletableFutureTest exten
4191		static <T,U,V> Function<T, CompletableFuture<V>> compose
4192		(Function<T, CompletableFuture<U>> f,
4193		Function<U, CompletableFuture<V>> g) {
4194	<	return (x) -> f.apply(x).thenCompose(g);
4194	>	return x -> f.apply(x).thenCompose(g);
4195		}
4196
4197		static void assertZero(CompletableFuture<?> f) {
4198		try {
4199		f.getNow(null);
4200	<	throw new AssertionFailedError("should throw");
4200	>	throw new AssertionError("should throw");
4201		} catch (CompletionException success) {
4202		assertTrue(success.getCause() instanceof ZeroException);
4203		}
#	Line 4097 | Line 4271 | public class CompletableFutureTest exten
4271
4272		// Some mutually non-commutative functions
4273		Function<Long, CompletableFuture<Long>> triple
4274	<	= (x) -> Monad.unit(3 * x);
4274	>	= x -> Monad.unit(3 * x);
4275		Function<Long, CompletableFuture<Long>> inc
4276	<	= (x) -> Monad.unit(x + 1);
4276	>	= x -> Monad.unit(x + 1);
4277
4278		// unit is a right identity: m >>= unit === m
4279		Monad.assertFutureEquals(inc.apply(5L).thenCompose(unit),
#	Line 4111 | Line 4285 | public class CompletableFutureTest exten
4285		// associativity: (m >>= f) >>= g === m >>= ( \x -> (f x >>= g) )
4286		Monad.assertFutureEquals(
4287		unit.apply(5L).thenCompose(inc).thenCompose(triple),
4288	<	unit.apply(5L).thenCompose((x) -> inc.apply(x).thenCompose(triple)));
4288	>	unit.apply(5L).thenCompose(x -> inc.apply(x).thenCompose(triple)));
4289
4290		// The case for CompletableFuture as an additive monad is weaker...
4291
#	Line 4121 | Line 4295 | public class CompletableFutureTest exten
4295		// left zero: zero >>= f === zero
4296		Monad.assertZero(zero.thenCompose(inc));
4297		// right zero: f >>= (\x -> zero) === zero
4298	<	Monad.assertZero(inc.apply(5L).thenCompose((x) -> zero));
4298	>	Monad.assertZero(inc.apply(5L).thenCompose(x -> zero));
4299
4300		// f plus zero === f
4301		Monad.assertFutureEquals(Monad.unit(5L),
#	Line 4148 | Line 4322 | public class CompletableFutureTest exten
4322		}
4323
4324		/** Test long recursive chains of CompletableFutures with cascading completions */
4325	+	@SuppressWarnings("FutureReturnValueIgnored")
4326		public void testRecursiveChains() throws Throwable {
4327		for (ExecutionMode m : ExecutionMode.values())
4328		for (boolean addDeadEnds : new boolean[] { true, false })
#	Line 4172 | Line 4347 | public class CompletableFutureTest exten
4347		* A single CompletableFuture with many dependents.
4348		* A demo of scalability - runtime is O(n).
4349		*/
4350	+	@SuppressWarnings("FutureReturnValueIgnored")
4351		public void testManyDependents() throws Throwable {
4352		final int n = expensiveTests ? 1_000_000 : 10;
4353		final CompletableFuture<Void> head = new CompletableFuture<>();
#	Line 4179 | Line 4355 | public class CompletableFutureTest exten
4355		final AtomicInteger count = new AtomicInteger(0);
4356		for (int i = 0; i < n; i++) {
4357		head.thenRun(() -> count.getAndIncrement());
4358	<	head.thenAccept((x) -> count.getAndIncrement());
4359	<	head.thenApply((x) -> count.getAndIncrement());
4358	>	head.thenAccept(x -> count.getAndIncrement());
4359	>	head.thenApply(x -> count.getAndIncrement());
4360
4361		head.runAfterBoth(complete, () -> count.getAndIncrement());
4362		head.thenAcceptBoth(complete, (x, y) -> count.getAndIncrement());
#	Line 4190 | Line 4366 | public class CompletableFutureTest exten
4366		complete.thenCombine(head, (x, y) -> count.getAndIncrement());
4367
4368		head.runAfterEither(new CompletableFuture<Void>(), () -> count.getAndIncrement());
4369	<	head.acceptEither(new CompletableFuture<Void>(), (x) -> count.getAndIncrement());
4370	<	head.applyToEither(new CompletableFuture<Void>(), (x) -> count.getAndIncrement());
4369	>	head.acceptEither(new CompletableFuture<Void>(), x -> count.getAndIncrement());
4370	>	head.applyToEither(new CompletableFuture<Void>(), x -> count.getAndIncrement());
4371		new CompletableFuture<Void>().runAfterEither(head, () -> count.getAndIncrement());
4372	<	new CompletableFuture<Void>().acceptEither(head, (x) -> count.getAndIncrement());
4373	<	new CompletableFuture<Void>().applyToEither(head, (x) -> count.getAndIncrement());
4372	>	new CompletableFuture<Void>().acceptEither(head, x -> count.getAndIncrement());
4373	>	new CompletableFuture<Void>().applyToEither(head, x -> count.getAndIncrement());
4374		}
4375		head.complete(null);
4376		assertEquals(5 * 3 * n, count.get());
4377		}
4378
4379		/** ant -Dvmoptions=-Xmx8m -Djsr166.expensiveTests=true -Djsr166.tckTestClass=CompletableFutureTest tck */
4380	+	@SuppressWarnings("FutureReturnValueIgnored")
4381		public void testCoCompletionGarbageRetention() throws Throwable {
4382		final int n = expensiveTests ? 1_000_000 : 10;
4383		final CompletableFuture<Integer> incomplete = new CompletableFuture<>();
#	Line 4211 | Line 4388 | public class CompletableFutureTest exten
4388		f.complete(null);
4389
4390		f = new CompletableFuture<>();
4391	<	f.acceptEither(incomplete, (x) -> {});
4391	>	f.acceptEither(incomplete, x -> {});
4392		f.complete(null);
4393
4394		f = new CompletableFuture<>();
4395	<	f.applyToEither(incomplete, (x) -> x);
4395	>	f.applyToEither(incomplete, x -> x);
4396		f.complete(null);
4397
4398		f = new CompletableFuture<>();
4399	<	CompletableFuture.anyOf(new CompletableFuture<?>[] { f, incomplete });
4399	>	CompletableFuture.anyOf(f, incomplete);
4400		f.complete(null);
4401		}
4402
#	Line 4229 | Line 4406 | public class CompletableFutureTest exten
4406		f.complete(null);
4407
4408		f = new CompletableFuture<>();
4409	<	incomplete.acceptEither(f, (x) -> {});
4409	>	incomplete.acceptEither(f, x -> {});
4410		f.complete(null);
4411
4412		f = new CompletableFuture<>();
4413	<	incomplete.applyToEither(f, (x) -> x);
4413	>	incomplete.applyToEither(f, x -> x);
4414		f.complete(null);
4415
4416		f = new CompletableFuture<>();
4417	<	CompletableFuture.anyOf(new CompletableFuture<?>[] { incomplete, f });
4417	>	CompletableFuture.anyOf(incomplete, f);
4418		f.complete(null);
4419		}
4420		}
#	Line 4291 | Line 4468 | public class CompletableFutureTest exten
4468		assertTrue(neverCompleted.thenRun(() -> {}).cancel(true));
4469		}
4470
4471	+	/**
4472	+	* Checks for garbage retention when MinimalStage.toCompletableFuture()
4473	+	* is invoked many times.
4474	+	* 8161600: Garbage retention when source CompletableFutures are never completed
4475	+	*
4476	+	* As of 2016-07, fails with OOME:
4477	+	* ant -Dvmoptions=-Xmx8m -Djsr166.expensiveTests=true -Djsr166.tckTestClass=CompletableFutureTest -Djsr166.methodFilter=testToCompletableFutureGarbageRetention tck
4478	+	*/
4479	+	public void testToCompletableFutureGarbageRetention() throws Throwable {
4480	+	final int n = expensiveTests ? 900_000 : 10;
4481	+	CompletableFuture<Integer> neverCompleted = new CompletableFuture<>();
4482	+	CompletionStage minimal = neverCompleted.minimalCompletionStage();
4483	+	for (int i = 0; i < n; i++)
4484	+	assertTrue(minimal.toCompletableFuture().cancel(true));
4485	+	}
4486	+
4487		//     static <U> U join(CompletionStage<U> stage) {
4488		//         CompletableFuture<U> f = new CompletableFuture<>();
4489		//         stage.whenComplete((v, ex) -> {

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