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

Comparing jsr166/src/test/tck/CompletableFutureTest.java (file contents):
Revision 1.110 by dl, Fri Sep 4 10:56:14 2015 UTC vs.
Revision 1.138 by jsr166, Sun Nov 15 23:31:51 2015 UTC

#	Line 7 | Line 7
7
8		import static java.util.concurrent.TimeUnit.MILLISECONDS;
9		import static java.util.concurrent.TimeUnit.SECONDS;
10	+	import static java.util.concurrent.CompletableFuture.completedFuture;
11	+	import static java.util.concurrent.CompletableFuture.failedFuture;
12	+
13	+	import java.lang.reflect.Method;
14	+	import java.lang.reflect.Modifier;
15	+
16	+	import java.util.stream.Collectors;
17	+	import java.util.stream.Stream;
18
19		import java.util.ArrayList;
20	+	import java.util.Arrays;
21		import java.util.List;
22		import java.util.Objects;
23	+	import java.util.Set;
24		import java.util.concurrent.Callable;
25		import java.util.concurrent.CancellationException;
26		import java.util.concurrent.CompletableFuture;
#	Line 28 | Line 38 | import java.util.function.BiConsumer;
38		import java.util.function.BiFunction;
39		import java.util.function.Consumer;
40		import java.util.function.Function;
41	+	import java.util.function.Predicate;
42		import java.util.function.Supplier;
43
44	+	import junit.framework.AssertionFailedError;
45		import junit.framework.Test;
46		import junit.framework.TestSuite;
47
#	Line 77 | Line 89 | public class CompletableFutureTest exten
89		assertTrue(f.toString().contains("[Completed normally]"));
90		}
91
92	<	void checkCompletedWithWrappedCFException(CompletableFuture<?> f) {
93	<	long startTime = System.nanoTime();
94	<	long timeoutMillis = LONG_DELAY_MS;
95	<	try {
96	<	f.get(timeoutMillis, MILLISECONDS);
97	<	shouldThrow();
98	<	} catch (ExecutionException success) {
99	<	assertTrue(success.getCause() instanceof CFException);
100	<	} catch (Throwable fail) { threadUnexpectedException(fail); }
101	<	assertTrue(millisElapsedSince(startTime) < timeoutMillis/2);
102	<
103	<	try {
104	<	f.join();
105	<	shouldThrow();
106	<	} catch (CompletionException success) {
107	<	assertTrue(success.getCause() instanceof CFException);
108	<	}
97	<	try {
98	<	f.getNow(null);
99	<	shouldThrow();
100	<	} catch (CompletionException success) {
101	<	assertTrue(success.getCause() instanceof CFException);
92	>	/**
93	>	* Returns the "raw" internal exceptional completion of f,
94	>	* without any additional wrapping with CompletionException.
95	>	*/
96	>	<U> Throwable exceptionalCompletion(CompletableFuture<U> f) {
97	>	// handle (and whenComplete) can distinguish between "direct"
98	>	// and "wrapped" exceptional completion
99	>	return f.handle((U u, Throwable t) -> t).join();
100	>	}
101	>
102	>	void checkCompletedExceptionally(CompletableFuture<?> f,
103	>	boolean wrapped,
104	>	Consumer<Throwable> checker) {
105	>	Throwable cause = exceptionalCompletion(f);
106	>	if (wrapped) {
107	>	assertTrue(cause instanceof CompletionException);
108	>	cause = cause.getCause();
109		}
110	<	try {
104	<	f.get();
105	<	shouldThrow();
106	<	} catch (ExecutionException success) {
107	<	assertTrue(success.getCause() instanceof CFException);
108	<	} catch (Throwable fail) { threadUnexpectedException(fail); }
109	<	assertTrue(f.isDone());
110	<	assertFalse(f.isCancelled());
111	<	assertTrue(f.toString().contains("[Completed exceptionally]"));
112	<	}
110	>	checker.accept(cause);
111
114	–	<U> void checkCompletedExceptionallyWithRootCause(CompletableFuture<U> f,
115	–	Throwable ex) {
112		long startTime = System.nanoTime();
117	–	long timeoutMillis = LONG_DELAY_MS;
113		try {
114	<	f.get(timeoutMillis, MILLISECONDS);
114	>	f.get(LONG_DELAY_MS, MILLISECONDS);
115		shouldThrow();
116		} catch (ExecutionException success) {
117	<	assertSame(ex, success.getCause());
117	>	assertSame(cause, success.getCause());
118		} catch (Throwable fail) { threadUnexpectedException(fail); }
119	<	assertTrue(millisElapsedSince(startTime) < timeoutMillis/2);
119	>	assertTrue(millisElapsedSince(startTime) < LONG_DELAY_MS / 2);
120
121		try {
122		f.join();
123		shouldThrow();
124		} catch (CompletionException success) {
125	<	assertSame(ex, success.getCause());
126	<	}
125	>	assertSame(cause, success.getCause());
126	>	} catch (Throwable fail) { threadUnexpectedException(fail); }
127	>
128		try {
129		f.getNow(null);
130		shouldThrow();
131		} catch (CompletionException success) {
132	<	assertSame(ex, success.getCause());
133	<	}
132	>	assertSame(cause, success.getCause());
133	>	} catch (Throwable fail) { threadUnexpectedException(fail); }
134	>
135		try {
136		f.get();
137		shouldThrow();
138		} catch (ExecutionException success) {
139	<	assertSame(ex, success.getCause());
139	>	assertSame(cause, success.getCause());
140		} catch (Throwable fail) { threadUnexpectedException(fail); }
141
145	–	assertTrue(f.isDone());
142		assertFalse(f.isCancelled());
143	+	assertTrue(f.isDone());
144	+	assertTrue(f.isCompletedExceptionally());
145		assertTrue(f.toString().contains("[Completed exceptionally]"));
146		}
147
148	<	<U> void checkCompletedExceptionallyWithTimeout(CompletableFuture<U> f) {
149	<	long startTime = System.nanoTime();
150	<	long timeoutMillis = LONG_DELAY_MS;
151	<	try {
154	<	f.get(timeoutMillis, MILLISECONDS);
155	<	shouldThrow();
156	<	} catch (ExecutionException ex) {
157	<	assertTrue(ex.getCause() instanceof TimeoutException);
158	<	} catch (Throwable fail) { threadUnexpectedException(fail); }
159	<	assertTrue(millisElapsedSince(startTime) < timeoutMillis/2);
160	<
161	<	try {
162	<	f.join();
163	<	shouldThrow();
164	<	} catch (Throwable ex) {
165	<	assertTrue(ex.getCause() instanceof TimeoutException);
166	<	}
167	<
168	<	try {
169	<	f.getNow(null);
170	<	shouldThrow();
171	<	} catch (Throwable ex) {
172	<	assertTrue(ex.getCause() instanceof TimeoutException);
173	<	}
148	>	void checkCompletedWithWrappedCFException(CompletableFuture<?> f) {
149	>	checkCompletedExceptionally(f, true,
150	>	(t) -> assertTrue(t instanceof CFException));
151	>	}
152
153	<	try {
154	<	f.get();
155	<	shouldThrow();
156	<	} catch (ExecutionException ex) {
179	<	assertTrue(ex.getCause() instanceof TimeoutException);
180	<	} catch (Throwable fail) { threadUnexpectedException(fail); }
153	>	void checkCompletedWithWrappedCancellationException(CompletableFuture<?> f) {
154	>	checkCompletedExceptionally(f, true,
155	>	(t) -> assertTrue(t instanceof CancellationException));
156	>	}
157
158	<	assertTrue(f.isDone());
159	<	assertFalse(f.isCancelled());
160	<	assertTrue(f.toString().contains("[Completed exceptionally]"));
158	>	void checkCompletedWithTimeoutException(CompletableFuture<?> f) {
159	>	checkCompletedExceptionally(f, false,
160	>	(t) -> assertTrue(t instanceof TimeoutException));
161		}
162
163	<	<U> void checkCompletedWithWrappedException(CompletableFuture<U> f,
164	<	Throwable ex) {
165	<	checkCompletedExceptionallyWithRootCause(f, ex);
190	<	try {
191	<	CompletableFuture<Throwable> spy = f.handle
192	<	((U u, Throwable t) -> t);
193	<	assertTrue(spy.join() instanceof CompletionException);
194	<	assertSame(ex, spy.join().getCause());
195	<	} catch (Throwable fail) { threadUnexpectedException(fail); }
163	>	void checkCompletedWithWrappedException(CompletableFuture<?> f,
164	>	Throwable ex) {
165	>	checkCompletedExceptionally(f, true, (t) -> assertSame(t, ex));
166		}
167
168	<	<U> void checkCompletedExceptionally(CompletableFuture<U> f, Throwable ex) {
169	<	checkCompletedExceptionallyWithRootCause(f, ex);
200	<	try {
201	<	CompletableFuture<Throwable> spy = f.handle
202	<	((U u, Throwable t) -> t);
203	<	assertSame(ex, spy.join());
204	<	} catch (Throwable fail) { threadUnexpectedException(fail); }
168	>	void checkCompletedExceptionally(CompletableFuture<?> f, Throwable ex) {
169	>	checkCompletedExceptionally(f, false, (t) -> assertSame(t, ex));
170		}
171
172		void checkCancelled(CompletableFuture<?> f) {
173		long startTime = System.nanoTime();
209	–	long timeoutMillis = LONG_DELAY_MS;
174		try {
175	<	f.get(timeoutMillis, MILLISECONDS);
175	>	f.get(LONG_DELAY_MS, MILLISECONDS);
176		shouldThrow();
177		} catch (CancellationException success) {
178		} catch (Throwable fail) { threadUnexpectedException(fail); }
179	<	assertTrue(millisElapsedSince(startTime) < timeoutMillis/2);
179	>	assertTrue(millisElapsedSince(startTime) < LONG_DELAY_MS / 2);
180
181		try {
182		f.join();
#	Line 227 | Line 191 | public class CompletableFutureTest exten
191		shouldThrow();
192		} catch (CancellationException success) {
193		} catch (Throwable fail) { threadUnexpectedException(fail); }
230	–	assertTrue(f.isDone());
231	–	assertTrue(f.isCompletedExceptionally());
232	–	assertTrue(f.isCancelled());
233	–	assertTrue(f.toString().contains("[Completed exceptionally]"));
234	–	}
194
195	<	void checkCompletedWithWrappedCancellationException(CompletableFuture<?> f) {
237	<	long startTime = System.nanoTime();
238	<	long timeoutMillis = LONG_DELAY_MS;
239	<	try {
240	<	f.get(timeoutMillis, MILLISECONDS);
241	<	shouldThrow();
242	<	} catch (ExecutionException success) {
243	<	assertTrue(success.getCause() instanceof CancellationException);
244	<	} catch (Throwable fail) { threadUnexpectedException(fail); }
245	<	assertTrue(millisElapsedSince(startTime) < timeoutMillis/2);
195	>	assertTrue(exceptionalCompletion(f) instanceof CancellationException);
196
247	–	try {
248	–	f.join();
249	–	shouldThrow();
250	–	} catch (CompletionException success) {
251	–	assertTrue(success.getCause() instanceof CancellationException);
252	–	}
253	–	try {
254	–	f.getNow(null);
255	–	shouldThrow();
256	–	} catch (CompletionException success) {
257	–	assertTrue(success.getCause() instanceof CancellationException);
258	–	}
259	–	try {
260	–	f.get();
261	–	shouldThrow();
262	–	} catch (ExecutionException success) {
263	–	assertTrue(success.getCause() instanceof CancellationException);
264	–	} catch (Throwable fail) { threadUnexpectedException(fail); }
197		assertTrue(f.isDone());
266	–	assertFalse(f.isCancelled());
198		assertTrue(f.isCompletedExceptionally());
199	+	assertTrue(f.isCancelled());
200		assertTrue(f.toString().contains("[Completed exceptionally]"));
201		}
202
#	Line 908 | Line 840 | public class CompletableFutureTest exten
840		if (!createIncomplete) assertTrue(f.complete(v1));
841		final CompletableFuture<Integer> g = f.exceptionally
842		((Throwable t) -> {
911	–	// Should not be called
843		a.getAndIncrement();
844	<	throw new AssertionError();
844	>	threadFail("should not be called");
845	>	return null;            // unreached
846		});
847		if (createIncomplete) assertTrue(f.complete(v1));
848
#	Line 944 | Line 876 | public class CompletableFutureTest exten
876		assertEquals(1, a.get());
877		}}
878
879	+	/**
880	+	* If an "exceptionally action" throws an exception, it completes
881	+	* exceptionally with that exception
882	+	*/
883		public void testExceptionally_exceptionalCompletionActionFailed() {
884		for (boolean createIncomplete : new boolean[] { true, false })
885		{
#	Line 962 | Line 898 | public class CompletableFutureTest exten
898		if (createIncomplete) f.completeExceptionally(ex1);
899
900		checkCompletedWithWrappedException(g, ex2);
901	+	checkCompletedExceptionally(f, ex1);
902		assertEquals(1, a.get());
903		}}
904
#	Line 969 | Line 906 | public class CompletableFutureTest exten
906		* whenComplete action executes on normal completion, propagating
907		* source result.
908		*/
909	<	public void testWhenComplete_normalCompletion1() {
909	>	public void testWhenComplete_normalCompletion() {
910		for (ExecutionMode m : ExecutionMode.values())
911		for (boolean createIncomplete : new boolean[] { true, false })
912		for (Integer v1 : new Integer[] { 1, null })
#	Line 979 | Line 916 | public class CompletableFutureTest exten
916		if (!createIncomplete) assertTrue(f.complete(v1));
917		final CompletableFuture<Integer> g = m.whenComplete
918		(f,
919	<	(Integer x, Throwable t) -> {
919	>	(Integer result, Throwable t) -> {
920		m.checkExecutionMode();
921	<	threadAssertSame(x, v1);
921	>	threadAssertSame(result, v1);
922		threadAssertNull(t);
923		a.getAndIncrement();
924		});
#	Line 1006 | Line 943 | public class CompletableFutureTest exten
943		if (!createIncomplete) f.completeExceptionally(ex);
944		final CompletableFuture<Integer> g = m.whenComplete
945		(f,
946	<	(Integer x, Throwable t) -> {
946	>	(Integer result, Throwable t) -> {
947		m.checkExecutionMode();
948	<	threadAssertNull(x);
948	>	threadAssertNull(result);
949		threadAssertSame(t, ex);
950		a.getAndIncrement();
951		});
#	Line 1033 | Line 970 | public class CompletableFutureTest exten
970		if (!createIncomplete) assertTrue(f.cancel(mayInterruptIfRunning));
971		final CompletableFuture<Integer> g = m.whenComplete
972		(f,
973	<	(Integer x, Throwable t) -> {
973	>	(Integer result, Throwable t) -> {
974		m.checkExecutionMode();
975	<	threadAssertNull(x);
975	>	threadAssertNull(result);
976		threadAssertTrue(t instanceof CancellationException);
977		a.getAndIncrement();
978		});
#	Line 1050 | Line 987 | public class CompletableFutureTest exten
987		* If a whenComplete action throws an exception when triggered by
988		* a normal completion, it completes exceptionally
989		*/
990	<	public void testWhenComplete_actionFailed() {
990	>	public void testWhenComplete_sourceCompletedNormallyActionFailed() {
991		for (boolean createIncomplete : new boolean[] { true, false })
992		for (ExecutionMode m : ExecutionMode.values())
993		for (Integer v1 : new Integer[] { 1, null })
#	Line 1061 | Line 998 | public class CompletableFutureTest exten
998		if (!createIncomplete) assertTrue(f.complete(v1));
999		final CompletableFuture<Integer> g = m.whenComplete
1000		(f,
1001	<	(Integer x, Throwable t) -> {
1001	>	(Integer result, Throwable t) -> {
1002		m.checkExecutionMode();
1003	<	threadAssertSame(x, v1);
1003	>	threadAssertSame(result, v1);
1004		threadAssertNull(t);
1005		a.getAndIncrement();
1006		throw ex;
#	Line 1078 | Line 1015 | public class CompletableFutureTest exten
1015		/**
1016		* If a whenComplete action throws an exception when triggered by
1017		* a source completion that also throws an exception, the source
1018	<	* exception takes precedence.
1018	>	* exception takes precedence (unlike handle)
1019		*/
1020	<	public void testWhenComplete_actionFailedSourceFailed() {
1020	>	public void testWhenComplete_sourceFailedActionFailed() {
1021		for (boolean createIncomplete : new boolean[] { true, false })
1022		for (ExecutionMode m : ExecutionMode.values())
1023		{
#	Line 1092 | Line 1029 | public class CompletableFutureTest exten
1029		if (!createIncomplete) f.completeExceptionally(ex1);
1030		final CompletableFuture<Integer> g = m.whenComplete
1031		(f,
1032	<	(Integer x, Throwable t) -> {
1032	>	(Integer result, Throwable t) -> {
1033		m.checkExecutionMode();
1034		threadAssertSame(t, ex1);
1035	<	threadAssertNull(x);
1035	>	threadAssertNull(result);
1036		a.getAndIncrement();
1037		throw ex2;
1038		});
#	Line 1103 | Line 1040 | public class CompletableFutureTest exten
1040
1041		checkCompletedWithWrappedException(g, ex1);
1042		checkCompletedExceptionally(f, ex1);
1043	+	assertEquals(1, ex1.getSuppressed().length);
1044	+	assertSame(ex2, ex1.getSuppressed()[0]);
1045		assertEquals(1, a.get());
1046		}}
1047
#	Line 1120 | Line 1059 | public class CompletableFutureTest exten
1059		if (!createIncomplete) assertTrue(f.complete(v1));
1060		final CompletableFuture<Integer> g = m.handle
1061		(f,
1062	<	(Integer x, Throwable t) -> {
1062	>	(Integer result, Throwable t) -> {
1063		m.checkExecutionMode();
1064	<	threadAssertSame(x, v1);
1064	>	threadAssertSame(result, v1);
1065		threadAssertNull(t);
1066		a.getAndIncrement();
1067		return inc(v1);
#	Line 1149 | Line 1088 | public class CompletableFutureTest exten
1088		if (!createIncomplete) f.completeExceptionally(ex);
1089		final CompletableFuture<Integer> g = m.handle
1090		(f,
1091	<	(Integer x, Throwable t) -> {
1091	>	(Integer result, Throwable t) -> {
1092		m.checkExecutionMode();
1093	<	threadAssertNull(x);
1093	>	threadAssertNull(result);
1094		threadAssertSame(t, ex);
1095		a.getAndIncrement();
1096		return v1;
#	Line 1178 | Line 1117 | public class CompletableFutureTest exten
1117		if (!createIncomplete) assertTrue(f.cancel(mayInterruptIfRunning));
1118		final CompletableFuture<Integer> g = m.handle
1119		(f,
1120	<	(Integer x, Throwable t) -> {
1120	>	(Integer result, Throwable t) -> {
1121		m.checkExecutionMode();
1122	<	threadAssertNull(x);
1122	>	threadAssertNull(result);
1123		threadAssertTrue(t instanceof CancellationException);
1124		a.getAndIncrement();
1125		return v1;
#	Line 1193 | Line 1132 | public class CompletableFutureTest exten
1132		}}
1133
1134		/**
1135	<	* handle result completes exceptionally if action does
1135	>	* If a "handle action" throws an exception when triggered by
1136	>	* a normal completion, it completes exceptionally
1137		*/
1138	<	public void testHandle_sourceFailedActionFailed() {
1138	>	public void testHandle_sourceCompletedNormallyActionFailed() {
1139		for (ExecutionMode m : ExecutionMode.values())
1140		for (boolean createIncomplete : new boolean[] { true, false })
1141	+	for (Integer v1 : new Integer[] { 1, null })
1142		{
1143		final CompletableFuture<Integer> f = new CompletableFuture<>();
1144		final AtomicInteger a = new AtomicInteger(0);
1145	<	final CFException ex1 = new CFException();
1146	<	final CFException ex2 = new CFException();
1206	<	if (!createIncomplete) f.completeExceptionally(ex1);
1145	>	final CFException ex = new CFException();
1146	>	if (!createIncomplete) assertTrue(f.complete(v1));
1147		final CompletableFuture<Integer> g = m.handle
1148		(f,
1149	<	(Integer x, Throwable t) -> {
1149	>	(Integer result, Throwable t) -> {
1150		m.checkExecutionMode();
1151	<	threadAssertNull(x);
1152	<	threadAssertSame(ex1, t);
1151	>	threadAssertSame(result, v1);
1152	>	threadAssertNull(t);
1153		a.getAndIncrement();
1154	<	throw ex2;
1154	>	throw ex;
1155		});
1156	<	if (createIncomplete) f.completeExceptionally(ex1);
1156	>	if (createIncomplete) assertTrue(f.complete(v1));
1157
1158	<	checkCompletedWithWrappedException(g, ex2);
1159	<	checkCompletedExceptionally(f, ex1);
1158	>	checkCompletedWithWrappedException(g, ex);
1159	>	checkCompletedNormally(f, v1);
1160		assertEquals(1, a.get());
1161		}}
1162
1163	<	public void testHandle_sourceCompletedNormallyActionFailed() {
1164	<	for (ExecutionMode m : ExecutionMode.values())
1163	>	/**
1164	>	* If a "handle action" throws an exception when triggered by
1165	>	* a source completion that also throws an exception, the action
1166	>	* exception takes precedence (unlike whenComplete)
1167	>	*/
1168	>	public void testHandle_sourceFailedActionFailed() {
1169		for (boolean createIncomplete : new boolean[] { true, false })
1170	<	for (Integer v1 : new Integer[] { 1, null })
1170	>	for (ExecutionMode m : ExecutionMode.values())
1171		{
1228	–	final CompletableFuture<Integer> f = new CompletableFuture<>();
1172		final AtomicInteger a = new AtomicInteger(0);
1173	<	final CFException ex = new CFException();
1174	<	if (!createIncomplete) assertTrue(f.complete(v1));
1173	>	final CFException ex1 = new CFException();
1174	>	final CFException ex2 = new CFException();
1175	>	final CompletableFuture<Integer> f = new CompletableFuture<>();
1176	>
1177	>	if (!createIncomplete) f.completeExceptionally(ex1);
1178		final CompletableFuture<Integer> g = m.handle
1179		(f,
1180	<	(Integer x, Throwable t) -> {
1180	>	(Integer result, Throwable t) -> {
1181		m.checkExecutionMode();
1182	<	threadAssertSame(x, v1);
1183	<	threadAssertNull(t);
1182	>	threadAssertNull(result);
1183	>	threadAssertSame(ex1, t);
1184		a.getAndIncrement();
1185	<	throw ex;
1185	>	throw ex2;
1186		});
1187	<	if (createIncomplete) assertTrue(f.complete(v1));
1187	>	if (createIncomplete) f.completeExceptionally(ex1);
1188
1189	<	checkCompletedWithWrappedException(g, ex);
1190	<	checkCompletedNormally(f, v1);
1189	>	checkCompletedWithWrappedException(g, ex2);
1190	>	checkCompletedExceptionally(f, ex1);
1191		assertEquals(1, a.get());
1192		}}
1193
#	Line 3142 | Line 3088 | public class CompletableFutureTest exten
3088		for (int i = 0; i < k; i++) {
3089		checkIncomplete(f);
3090		checkIncomplete(CompletableFuture.allOf(fs));
3091	<	if (i != k/2) {
3091	>	if (i != k / 2) {
3092		fs[i].complete(i);
3093		checkCompletedNormally(fs[i], i);
3094		} else {
#	Line 3345 | Line 3291 | public class CompletableFutureTest exten
3291		() -> CompletableFuture.anyOf(null, f),
3292
3293		() -> f.obtrudeException(null),
3294	+
3295	+	() -> CompletableFuture.delayedExecutor(1L, SECONDS, null),
3296	+	() -> CompletableFuture.delayedExecutor(1L, null, new ThreadExecutor()),
3297	+	() -> CompletableFuture.delayedExecutor(1L, null),
3298	+
3299	+	() -> f.orTimeout(1L, null),
3300	+	() -> f.completeOnTimeout(42, 1L, null),
3301	+
3302	+	() -> CompletableFuture.failedFuture(null),
3303	+	() -> CompletableFuture.failedStage(null),
3304		};
3305
3306		assertThrows(NullPointerException.class, throwingActions);
#	Line 3365 | Line 3321 | public class CompletableFutureTest exten
3321		* newIncompleteFuture returns an incomplete CompletableFuture
3322		*/
3323		public void testNewIncompleteFuture() {
3324	+	for (Integer v1 : new Integer[] { 1, null })
3325	+	{
3326		CompletableFuture<Integer> f = new CompletableFuture<>();
3327		CompletableFuture<Integer> g = f.newIncompleteFuture();
3328		checkIncomplete(f);
3329		checkIncomplete(g);
3330	<	}
3330	>	f.complete(v1);
3331	>	checkCompletedNormally(f, v1);
3332	>	checkIncomplete(g);
3333	>	g.complete(v1);
3334	>	checkCompletedNormally(g, v1);
3335	>	assertSame(g.getClass(), CompletableFuture.class);
3336	>	}}
3337
3338		/**
3339		* completedStage returns a completed CompletionStage
3340		*/
3341		public void testCompletedStage() {
3342	<	AtomicInteger x = new AtomicInteger();
3342	>	AtomicInteger x = new AtomicInteger(0);
3343		AtomicReference<Throwable> r = new AtomicReference<Throwable>();
3344		CompletionStage<Integer> f = CompletableFuture.completedStage(1);
3345		f.whenComplete((v, e) -> {if (e != null) r.set(e); else x.set(v);});
#	Line 3393 | Line 3357 | public class CompletableFutureTest exten
3357		Executor c = ForkJoinPool.commonPool();
3358		if (ForkJoinPool.getCommonPoolParallelism() > 1)
3359		assertSame(e, c);
3360	+	else
3361	+	assertNotSame(e, c);
3362		}
3363
3364		/**
#	Line 3402 | Line 3368 | public class CompletableFutureTest exten
3368		public void testFailedFuture() {
3369		CFException ex = new CFException();
3370		CompletableFuture<Integer> f = CompletableFuture.failedFuture(ex);
3371	<	checkCompletedExceptionallyWithRootCause(f, ex);
3371	>	checkCompletedExceptionally(f, ex);
3372		}
3373
3374		/**
3375		* failedFuture(null) throws NPE
3376		*/
3377	<	public void testFailedFuture2() {
3377	>	public void testFailedFuture_null() {
3378		try {
3379		CompletableFuture<Integer> f = CompletableFuture.failedFuture(null);
3380		shouldThrow();
#	Line 3441 | Line 3407 | public class CompletableFutureTest exten
3407		CFException ex = new CFException();
3408		f.completeExceptionally(ex);
3409		checkCompletedExceptionally(f, ex);
3410	<	checkCompletedWithWrappedCFException(g);
3410	>	checkCompletedWithWrappedException(g, ex);
3411		}
3412
3413		/**
#	Line 3451 | Line 3417 | public class CompletableFutureTest exten
3417		public void testMinimalCompletionStage() {
3418		CompletableFuture<Integer> f = new CompletableFuture<>();
3419		CompletionStage<Integer> g = f.minimalCompletionStage();
3420	<	AtomicInteger x = new AtomicInteger();
3420	>	AtomicInteger x = new AtomicInteger(0);
3421		AtomicReference<Throwable> r = new AtomicReference<Throwable>();
3422		checkIncomplete(f);
3423		g.whenComplete((v, e) -> {if (e != null) r.set(e); else x.set(v);});
#	Line 3468 | Line 3434 | public class CompletableFutureTest exten
3434		public void testMinimalCompletionStage2() {
3435		CompletableFuture<Integer> f = new CompletableFuture<>();
3436		CompletionStage<Integer> g = f.minimalCompletionStage();
3437	<	AtomicInteger x = new AtomicInteger();
3437	>	AtomicInteger x = new AtomicInteger(0);
3438		AtomicReference<Throwable> r = new AtomicReference<Throwable>();
3439		g.whenComplete((v, e) -> {if (e != null) r.set(e); else x.set(v);});
3440		checkIncomplete(f);
#	Line 3486 | Line 3452 | public class CompletableFutureTest exten
3452		public void testFailedStage() {
3453		CFException ex = new CFException();
3454		CompletionStage<Integer> f = CompletableFuture.failedStage(ex);
3455	<	AtomicInteger x = new AtomicInteger();
3455	>	AtomicInteger x = new AtomicInteger(0);
3456		AtomicReference<Throwable> r = new AtomicReference<Throwable>();
3457		f.whenComplete((v, e) -> {if (e != null) r.set(e); else x.set(v);});
3458		assertEquals(x.get(), 0);
3459	<	assertEquals(r.get().getCause(), ex);
3459	>	assertEquals(r.get(), ex);
3460		}
3461
3462		/**
3463		* completeAsync completes with value of given supplier
3464		*/
3465		public void testCompleteAsync() {
3466	+	for (Integer v1 : new Integer[] { 1, null })
3467	+	{
3468		CompletableFuture<Integer> f = new CompletableFuture<>();
3469	<	f.completeAsync(() -> 1);
3469	>	f.completeAsync(() -> v1);
3470		f.join();
3471	<	checkCompletedNormally(f, 1);
3472	<	}
3471	>	checkCompletedNormally(f, v1);
3472	>	}}
3473
3474		/**
3475		* completeAsync completes exceptionally if given supplier throws
#	Line 3513 | Line 3481 | public class CompletableFutureTest exten
3481		try {
3482		f.join();
3483		shouldThrow();
3484	<	} catch (Exception success) {}
3485	<	checkCompletedWithWrappedCFException(f);
3484	>	} catch (CompletionException success) {}
3485	>	checkCompletedWithWrappedException(f, ex);
3486		}
3487
3488		/**
3489		* completeAsync with given executor completes with value of given supplier
3490		*/
3491		public void testCompleteAsync3() {
3492	+	for (Integer v1 : new Integer[] { 1, null })
3493	+	{
3494		CompletableFuture<Integer> f = new CompletableFuture<>();
3495	<	f.completeAsync(() -> 1, new ThreadExecutor());
3496	<	f.join();
3497	<	checkCompletedNormally(f, 1);
3498	<	}
3495	>	ThreadExecutor executor = new ThreadExecutor();
3496	>	f.completeAsync(() -> v1, executor);
3497	>	assertSame(v1, f.join());
3498	>	checkCompletedNormally(f, v1);
3499	>	assertEquals(1, executor.count.get());
3500	>	}}
3501
3502		/**
3503		* completeAsync with given executor completes exceptionally if
#	Line 3534 | Line 3506 | public class CompletableFutureTest exten
3506		public void testCompleteAsync4() {
3507		CompletableFuture<Integer> f = new CompletableFuture<>();
3508		CFException ex = new CFException();
3509	<	f.completeAsync(() -> {if (true) throw ex; return 1;}, new ThreadExecutor());
3509	>	ThreadExecutor executor = new ThreadExecutor();
3510	>	f.completeAsync(() -> {if (true) throw ex; return 1;}, executor);
3511		try {
3512		f.join();
3513		shouldThrow();
3514	<	} catch (Exception success) {}
3515	<	checkCompletedWithWrappedCFException(f);
3514	>	} catch (CompletionException success) {}
3515	>	checkCompletedWithWrappedException(f, ex);
3516	>	assertEquals(1, executor.count.get());
3517		}
3518
3519		/**
3520		* orTimeout completes with TimeoutException if not complete
3521		*/
3522	<	public void testOrTimeout() {
3522	>	public void testOrTimeout_timesOut() {
3523	>	long timeoutMillis = timeoutMillis();
3524		CompletableFuture<Integer> f = new CompletableFuture<>();
3525	<	f.orTimeout(SHORT_DELAY_MS, TimeUnit.MILLISECONDS);
3526	<	checkCompletedExceptionallyWithTimeout(f);
3525	>	long startTime = System.nanoTime();
3526	>	f.orTimeout(timeoutMillis, MILLISECONDS);
3527	>	checkCompletedWithTimeoutException(f);
3528	>	assertTrue(millisElapsedSince(startTime) >= timeoutMillis);
3529		}
3530
3531		/**
3532		* orTimeout completes normally if completed before timeout
3533		*/
3534	<	public void testOrTimeout2() {
3534	>	public void testOrTimeout_completed() {
3535	>	for (Integer v1 : new Integer[] { 1, null })
3536	>	{
3537		CompletableFuture<Integer> f = new CompletableFuture<>();
3538	<	f.complete(1);
3539	<	f.orTimeout(SHORT_DELAY_MS, TimeUnit.MILLISECONDS);
3540	<	checkCompletedNormally(f, 1);
3541	<	}
3538	>	CompletableFuture<Integer> g = new CompletableFuture<>();
3539	>	long startTime = System.nanoTime();
3540	>	f.complete(v1);
3541	>	f.orTimeout(LONG_DELAY_MS, MILLISECONDS);
3542	>	g.orTimeout(LONG_DELAY_MS, MILLISECONDS);
3543	>	g.complete(v1);
3544	>	checkCompletedNormally(f, v1);
3545	>	checkCompletedNormally(g, v1);
3546	>	assertTrue(millisElapsedSince(startTime) < LONG_DELAY_MS / 2);
3547	>	}}
3548
3549		/**
3550		* completeOnTimeout completes with given value if not complete
3551		*/
3552	<	public void testCompleteOnTimeout() {
3552	>	public void testCompleteOnTimeout_timesOut() {
3553	>	testInParallel(() -> testCompleteOnTimeout_timesOut(42),
3554	>	() -> testCompleteOnTimeout_timesOut(null));
3555	>	}
3556	>
3557	>	public void testCompleteOnTimeout_timesOut(Integer v) {
3558	>	long timeoutMillis = timeoutMillis();
3559		CompletableFuture<Integer> f = new CompletableFuture<>();
3560	<	f.completeOnTimeout(-1, SHORT_DELAY_MS, TimeUnit.MILLISECONDS);
3561	<	f.join();
3562	<	checkCompletedNormally(f, -1);
3560	>	long startTime = System.nanoTime();
3561	>	f.completeOnTimeout(v, timeoutMillis, MILLISECONDS);
3562	>	assertSame(v, f.join());
3563	>	assertTrue(millisElapsedSince(startTime) >= timeoutMillis);
3564	>	f.complete(99);         // should have no effect
3565	>	checkCompletedNormally(f, v);
3566		}
3567
3568		/**
3569		* completeOnTimeout has no effect if completed within timeout
3570		*/
3571	<	public void testCompleteOnTimeout2() {
3571	>	public void testCompleteOnTimeout_completed() {
3572	>	for (Integer v1 : new Integer[] { 1, null })
3573	>	{
3574		CompletableFuture<Integer> f = new CompletableFuture<>();
3575	<	f.complete(1);
3576	<	f.completeOnTimeout(-1, SHORT_DELAY_MS, TimeUnit.MILLISECONDS);
3577	<	checkCompletedNormally(f, 1);
3578	<	}
3575	>	CompletableFuture<Integer> g = new CompletableFuture<>();
3576	>	long startTime = System.nanoTime();
3577	>	f.complete(v1);
3578	>	f.completeOnTimeout(-1, LONG_DELAY_MS, MILLISECONDS);
3579	>	g.completeOnTimeout(-1, LONG_DELAY_MS, MILLISECONDS);
3580	>	g.complete(v1);
3581	>	checkCompletedNormally(f, v1);
3582	>	checkCompletedNormally(g, v1);
3583	>	assertTrue(millisElapsedSince(startTime) < LONG_DELAY_MS / 2);
3584	>	}}
3585
3586		/**
3587		* delayedExecutor returns an executor that delays submission
3588		*/
3589		public void testDelayedExecutor() {
3590	<	long timeoutMillis = SMALL_DELAY_MS;
3591	<	Executor d = CompletableFuture.delayedExecutor(timeoutMillis,
3592	<	MILLISECONDS);
3590	>	testInParallel(() -> testDelayedExecutor(null, null),
3591	>	() -> testDelayedExecutor(null, 1),
3592	>	() -> testDelayedExecutor(new ThreadExecutor(), 1),
3593	>	() -> testDelayedExecutor(new ThreadExecutor(), 1));
3594	>	}
3595	>
3596	>	public void testDelayedExecutor(Executor executor, Integer v) throws Exception {
3597	>	long timeoutMillis = timeoutMillis();
3598	>	// Use an "unreasonably long" long timeout to catch lingering threads
3599	>	long longTimeoutMillis = 1000 * 60 * 60 * 24;
3600	>	final Executor delayer, longDelayer;
3601	>	if (executor == null) {
3602	>	delayer = CompletableFuture.delayedExecutor(timeoutMillis, MILLISECONDS);
3603	>	longDelayer = CompletableFuture.delayedExecutor(longTimeoutMillis, MILLISECONDS);
3604	>	} else {
3605	>	delayer = CompletableFuture.delayedExecutor(timeoutMillis, MILLISECONDS, executor);
3606	>	longDelayer = CompletableFuture.delayedExecutor(longTimeoutMillis, MILLISECONDS, executor);
3607	>	}
3608		long startTime = System.nanoTime();
3609	<	CompletableFuture<Integer> f = CompletableFuture.supplyAsync(() -> 1, d);
3610	<	assertNull(f.getNow(null));
3611	<	try {
3612	<	f.get(LONG_DELAY_MS, MILLISECONDS);
3613	<	} catch (Throwable fail) { threadUnexpectedException(fail); }
3614	<	assertTrue(millisElapsedSince(startTime) > timeoutMillis/2);
3615	<	checkCompletedNormally(f, 1);
3616	<	}
3609	>	CompletableFuture<Integer> f =
3610	>	CompletableFuture.supplyAsync(() -> v, delayer);
3611	>	CompletableFuture<Integer> g =
3612	>	CompletableFuture.supplyAsync(() -> v, longDelayer);
3613	>
3614	>	assertNull(g.getNow(null));
3615	>
3616	>	assertSame(v, f.get(LONG_DELAY_MS, MILLISECONDS));
3617	>	long millisElapsed = millisElapsedSince(startTime);
3618	>	assertTrue(millisElapsed >= timeoutMillis);
3619	>	assertTrue(millisElapsed < LONG_DELAY_MS / 2);
3620
3621	<	/**
3622	<	* delayedExecutor for a given executor returns an executor that
3623	<	* delays submission
3624	<	*/
3605	<	public void testDelayedExecutor2() {
3606	<	long timeoutMillis = SMALL_DELAY_MS;
3607	<	Executor d = CompletableFuture.delayedExecutor(timeoutMillis,
3608	<	MILLISECONDS,
3609	<	new ThreadExecutor());
3610	<	long startTime = System.nanoTime();
3611	<	CompletableFuture<Integer> f = CompletableFuture.supplyAsync(() -> 1, d);
3612	<	assertNull(f.getNow(null));
3613	<	try {
3614	<	f.get(LONG_DELAY_MS, MILLISECONDS);
3615	<	} catch (Throwable fail) { threadUnexpectedException(fail); }
3616	<	assertTrue(millisElapsedSince(startTime) > timeoutMillis/2);
3617	<	checkCompletedNormally(f, 1);
3621	>	checkCompletedNormally(f, v);
3622	>
3623	>	checkIncomplete(g);
3624	>	assertTrue(g.cancel(true));
3625		}
3626
3627		//--- tests of implementation details; not part of official tck ---
#	Line 3651 | Line 3658 | public class CompletableFutureTest exten
3658		funs.add((y) -> m.thenAcceptBoth(y, v42, new SubtractAction(m)));
3659		funs.add((y) -> m.thenCombine(y, v42, new SubtractFunction(m)));
3660
3661	<	funs.add((y) -> m.whenComplete(y, (Integer x, Throwable t) -> {}));
3661	>	funs.add((y) -> m.whenComplete(y, (Integer r, Throwable t) -> {}));
3662
3663		funs.add((y) -> m.thenCompose(y, new CompletableFutureInc(m)));
3664
#	Line 3707 | Line 3714 | public class CompletableFutureTest exten
3714		}
3715		}}
3716
3717	+	/**
3718	+	* Minimal completion stages throw UOE for all non-CompletionStage methods
3719	+	*/
3720	+	public void testMinimalCompletionStage_minimality() {
3721	+	if (!testImplementationDetails) return;
3722	+	Function<Method, String> toSignature =
3723	+	(method) -> method.getName() + Arrays.toString(method.getParameterTypes());
3724	+	Predicate<Method> isNotStatic =
3725	+	(method) -> (method.getModifiers() & Modifier.STATIC) == 0;
3726	+	List<Method> minimalMethods =
3727	+	Stream.of(Object.class, CompletionStage.class)
3728	+	.flatMap((klazz) -> Stream.of(klazz.getMethods()))
3729	+	.filter(isNotStatic)
3730	+	.collect(Collectors.toList());
3731	+	// Methods from CompletableFuture permitted NOT to throw UOE
3732	+	String[] signatureWhitelist = {
3733	+	"newIncompleteFuture[]",
3734	+	"defaultExecutor[]",
3735	+	"minimalCompletionStage[]",
3736	+	"copy[]",
3737	+	};
3738	+	Set<String> permittedMethodSignatures =
3739	+	Stream.concat(minimalMethods.stream().map(toSignature),
3740	+	Stream.of(signatureWhitelist))
3741	+	.collect(Collectors.toSet());
3742	+	List<Method> allMethods = Stream.of(CompletableFuture.class.getMethods())
3743	+	.filter(isNotStatic)
3744	+	.filter((method) -> !permittedMethodSignatures.contains(toSignature.apply(method)))
3745	+	.collect(Collectors.toList());
3746	+
3747	+	CompletionStage<Integer> minimalStage =
3748	+	new CompletableFuture<Integer>().minimalCompletionStage();
3749	+
3750	+	List<Method> bugs = new ArrayList<>();
3751	+	for (Method method : allMethods) {
3752	+	Class<?>[] parameterTypes = method.getParameterTypes();
3753	+	Object[] args = new Object[parameterTypes.length];
3754	+	// Manufacture boxed primitives for primitive params
3755	+	for (int i = 0; i < args.length; i++) {
3756	+	Class<?> type = parameterTypes[i];
3757	+	if (parameterTypes[i] == boolean.class)
3758	+	args[i] = false;
3759	+	else if (parameterTypes[i] == int.class)
3760	+	args[i] = 0;
3761	+	else if (parameterTypes[i] == long.class)
3762	+	args[i] = 0L;
3763	+	}
3764	+	try {
3765	+	method.invoke(minimalStage, args);
3766	+	bugs.add(method);
3767	+	}
3768	+	catch (java.lang.reflect.InvocationTargetException expected) {
3769	+	if (! (expected.getCause() instanceof UnsupportedOperationException)) {
3770	+	bugs.add(method);
3771	+	// expected.getCause().printStackTrace();
3772	+	}
3773	+	}
3774	+	catch (ReflectiveOperationException bad) { throw new Error(bad); }
3775	+	}
3776	+	if (!bugs.isEmpty())
3777	+	throw new Error("Methods did not throw UOE: " + bugs.toString());
3778	+	}
3779	+
3780	+	static class Monad {
3781	+	static class ZeroException extends RuntimeException {
3782	+	public ZeroException() { super("monadic zero"); }
3783	+	}
3784	+	// "return", "unit"
3785	+	static <T> CompletableFuture<T> unit(T value) {
3786	+	return completedFuture(value);
3787	+	}
3788	+	// monadic zero ?
3789	+	static <T> CompletableFuture<T> zero() {
3790	+	return failedFuture(new ZeroException());
3791	+	}
3792	+	// >=>
3793	+	static <T,U,V> Function<T, CompletableFuture<V>> compose
3794	+	(Function<T, CompletableFuture<U>> f,
3795	+	Function<U, CompletableFuture<V>> g) {
3796	+	return (x) -> f.apply(x).thenCompose(g);
3797	+	}
3798	+
3799	+	static void assertZero(CompletableFuture<?> f) {
3800	+	try {
3801	+	f.getNow(null);
3802	+	throw new AssertionFailedError("should throw");
3803	+	} catch (CompletionException success) {
3804	+	assertTrue(success.getCause() instanceof ZeroException);
3805	+	}
3806	+	}
3807	+
3808	+	static <T> void assertFutureEquals(CompletableFuture<T> f,
3809	+	CompletableFuture<T> g) {
3810	+	T fval = null, gval = null;
3811	+	Throwable fex = null, gex = null;
3812	+
3813	+	try { fval = f.get(); }
3814	+	catch (ExecutionException ex) { fex = ex.getCause(); }
3815	+	catch (Throwable ex) { fex = ex; }
3816	+
3817	+	try { gval = g.get(); }
3818	+	catch (ExecutionException ex) { gex = ex.getCause(); }
3819	+	catch (Throwable ex) { gex = ex; }
3820	+
3821	+	if (fex != null || gex != null)
3822	+	assertSame(fex.getClass(), gex.getClass());
3823	+	else
3824	+	assertEquals(fval, gval);
3825	+	}
3826	+
3827	+	static class PlusFuture<T> extends CompletableFuture<T> {
3828	+	AtomicReference<Throwable> firstFailure = new AtomicReference<>(null);
3829	+	}
3830	+
3831	+	/** Implements "monadic plus". */
3832	+	static <T> CompletableFuture<T> plus(CompletableFuture<? extends T> f,
3833	+	CompletableFuture<? extends T> g) {
3834	+	PlusFuture<T> plus = new PlusFuture<T>();
3835	+	BiConsumer<T, Throwable> action = (T result, Throwable ex) -> {
3836	+	try {
3837	+	if (ex == null) {
3838	+	if (plus.complete(result))
3839	+	if (plus.firstFailure.get() != null)
3840	+	plus.firstFailure.set(null);
3841	+	}
3842	+	else if (plus.firstFailure.compareAndSet(null, ex)) {
3843	+	if (plus.isDone())
3844	+	plus.firstFailure.set(null);
3845	+	}
3846	+	else {
3847	+	// first failure has precedence
3848	+	Throwable first = plus.firstFailure.getAndSet(null);
3849	+
3850	+	// may fail with "Self-suppression not permitted"
3851	+	try { first.addSuppressed(ex); }
3852	+	catch (Exception ignored) {}
3853	+
3854	+	plus.completeExceptionally(first);
3855	+	}
3856	+	} catch (Throwable unexpected) {
3857	+	plus.completeExceptionally(unexpected);
3858	+	}
3859	+	};
3860	+	f.whenComplete(action);
3861	+	g.whenComplete(action);
3862	+	return plus;
3863	+	}
3864	+	}
3865	+
3866	+	/**
3867	+	* CompletableFuture is an additive monad - sort of.
3868	+	* https://en.wikipedia.org/wiki/Monad_(functional_programming)#Additive_monads
3869	+	*/
3870	+	public void testAdditiveMonad() throws Throwable {
3871	+	Function<Long, CompletableFuture<Long>> unit = Monad::unit;
3872	+	CompletableFuture<Long> zero = Monad.zero();
3873	+
3874	+	// Some mutually non-commutative functions
3875	+	Function<Long, CompletableFuture<Long>> triple
3876	+	= (x) -> Monad.unit(3 * x);
3877	+	Function<Long, CompletableFuture<Long>> inc
3878	+	= (x) -> Monad.unit(x + 1);
3879	+
3880	+	// unit is a right identity: m >>= unit === m
3881	+	Monad.assertFutureEquals(inc.apply(5L).thenCompose(unit),
3882	+	inc.apply(5L));
3883	+	// unit is a left identity: (unit x) >>= f === f x
3884	+	Monad.assertFutureEquals(unit.apply(5L).thenCompose(inc),
3885	+	inc.apply(5L));
3886	+
3887	+	// associativity: (m >>= f) >>= g === m >>= ( \x -> (f x >>= g) )
3888	+	Monad.assertFutureEquals(
3889	+	unit.apply(5L).thenCompose(inc).thenCompose(triple),
3890	+	unit.apply(5L).thenCompose((x) -> inc.apply(x).thenCompose(triple)));
3891	+
3892	+	// The case for CompletableFuture as an additive monad is weaker...
3893	+
3894	+	// zero is a monadic zero
3895	+	Monad.assertZero(zero);
3896	+
3897	+	// left zero: zero >>= f === zero
3898	+	Monad.assertZero(zero.thenCompose(inc));
3899	+	// right zero: f >>= (\x -> zero) === zero
3900	+	Monad.assertZero(inc.apply(5L).thenCompose((x) -> zero));
3901	+
3902	+	// f plus zero === f
3903	+	Monad.assertFutureEquals(Monad.unit(5L),
3904	+	Monad.plus(Monad.unit(5L), zero));
3905	+	// zero plus f === f
3906	+	Monad.assertFutureEquals(Monad.unit(5L),
3907	+	Monad.plus(zero, Monad.unit(5L)));
3908	+	// zero plus zero === zero
3909	+	Monad.assertZero(Monad.plus(zero, zero));
3910	+	{
3911	+	CompletableFuture<Long> f = Monad.plus(Monad.unit(5L),
3912	+	Monad.unit(8L));
3913	+	// non-determinism
3914	+	assertTrue(f.get() == 5L || f.get() == 8L);
3915	+	}
3916	+
3917	+	CompletableFuture<Long> godot = new CompletableFuture<>();
3918	+	// f plus godot === f (doesn't wait for godot)
3919	+	Monad.assertFutureEquals(Monad.unit(5L),
3920	+	Monad.plus(Monad.unit(5L), godot));
3921	+	// godot plus f === f (doesn't wait for godot)
3922	+	Monad.assertFutureEquals(Monad.unit(5L),
3923	+	Monad.plus(godot, Monad.unit(5L)));
3924	+	}
3925	+
3926	+	//     static <U> U join(CompletionStage<U> stage) {
3927	+	//         CompletableFuture<U> f = new CompletableFuture<>();
3928	+	//         stage.whenComplete((v, ex) -> {
3929	+	//             if (ex != null) f.completeExceptionally(ex); else f.complete(v);
3930	+	//         });
3931	+	//         return f.join();
3932	+	//     }
3933	+
3934	+	//     static <U> boolean isDone(CompletionStage<U> stage) {
3935	+	//         CompletableFuture<U> f = new CompletableFuture<>();
3936	+	//         stage.whenComplete((v, ex) -> {
3937	+	//             if (ex != null) f.completeExceptionally(ex); else f.complete(v);
3938	+	//         });
3939	+	//         return f.isDone();
3940	+	//     }
3941	+
3942	+	//     static <U> U join2(CompletionStage<U> stage) {
3943	+	//         return stage.toCompletableFuture().copy().join();
3944	+	//     }
3945	+
3946	+	//     static <U> boolean isDone2(CompletionStage<U> stage) {
3947	+	//         return stage.toCompletableFuture().copy().isDone();
3948	+	//     }
3949	+
3950		}

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