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/**
* Copyright 2016 Netflix, Inc.
*
* Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in
* compliance with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software distributed under the License is
* distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See
* the License for the specific language governing permissions and limitations under the License.
*/
package io.reactivex;
import static org.junit.Assert.*;
import static org.mockito.ArgumentMatchers.any;
import static org.mockito.Mockito.mock;
import java.lang.reflect.*;
import java.util.*;
import java.util.concurrent.*;
import java.util.concurrent.atomic.AtomicInteger;
import org.mockito.Mockito;
import org.mockito.invocation.InvocationOnMock;
import org.mockito.stubbing.Answer;
import org.reactivestreams.*;
import io.reactivex.disposables.*;
import io.reactivex.exceptions.*;
import io.reactivex.functions.*;
import io.reactivex.internal.functions.ObjectHelper;
import io.reactivex.internal.fuseable.*;
import io.reactivex.internal.operators.maybe.MaybeToFlowable;
import io.reactivex.internal.operators.single.SingleToFlowable;
import io.reactivex.internal.subscriptions.BooleanSubscription;
import io.reactivex.internal.util.ExceptionHelper;
import io.reactivex.observers.TestObserver;
import io.reactivex.plugins.RxJavaPlugins;
import io.reactivex.processors.PublishProcessor;
import io.reactivex.schedulers.Schedulers;
import io.reactivex.subjects.Subject;
import io.reactivex.subscribers.TestSubscriber;
/**
* Common methods for helping with tests from 1.x mostly.
*/
public enum TestHelper {
;
/**
* Mocks a subscriber and prepares it to request Long.MAX_VALUE.
* @param <T> the value type
* @return the mocked subscriber
*/
@SuppressWarnings("unchecked")
public static <T> Subscriber<T> mockSubscriber() {
Subscriber<T> w = mock(Subscriber.class);
Mockito.doAnswer(new Answer<Object>() {
@Override
public Object answer(InvocationOnMock a) throws Throwable {
Subscription s = a.getArgument(0);
s.request(Long.MAX_VALUE);
return null;
}
}).when(w).onSubscribe((Subscription)any());
return w;
}
/**
* Mocks an Observer with the proper receiver type.
* @param <T> the value type
* @return the mocked observer
*/
@SuppressWarnings("unchecked")
public static <T> Observer<T> mockObserver() {
return mock(Observer.class);
}
/**
* Mocks an MaybeObserver with the proper receiver type.
* @param <T> the value type
* @return the mocked observer
*/
@SuppressWarnings("unchecked")
public static <T> MaybeObserver<T> mockMaybeObserver() {
return mock(MaybeObserver.class);
}
/**
* Mocks an SingleObserver with the proper receiver type.
* @param <T> the value type
* @return the mocked observer
*/
@SuppressWarnings("unchecked")
public static <T> SingleObserver<T> mockSingleObserver() {
return mock(SingleObserver.class);
}
/**
* Mocks an CompletableObserver.
* @return the mocked observer
*/
public static CompletableObserver mockCompletableObserver() {
return mock(CompletableObserver.class);
}
/**
* Validates that the given class, when forcefully instantiated throws
* an IllegalArgumentException("No instances!") exception.
* @param clazz the class to test, not null
*/
public static void checkUtilityClass(Class<?> clazz) {
try {
Constructor<?> c = clazz.getDeclaredConstructor();
c.setAccessible(true);
try {
c.newInstance();
fail("Should have thrown InvocationTargetException(IllegalStateException)");
} catch (InvocationTargetException ex) {
assertEquals("No instances!", ex.getCause().getMessage());
}
} catch (Exception ex) {
AssertionError ae = new AssertionError(ex.toString());
ae.initCause(ex);
throw ae;
}
}
public static List<Throwable> trackPluginErrors() {
final List<Throwable> list = Collections.synchronizedList(new ArrayList<Throwable>());
RxJavaPlugins.setErrorHandler(new Consumer<Throwable>() {
@Override
public void accept(Throwable t) {
list.add(t);
}
});
return list;
}
public static void assertError(List<Throwable> list, int index, Class<? extends Throwable> clazz) {
Throwable ex = list.get(index);
if (!clazz.isInstance(ex)) {
AssertionError err = new AssertionError(clazz + " expected but got " + list.get(index));
err.initCause(list.get(index));
throw err;
}
}
public static void assertError(List<Throwable> list, int index, Class<? extends Throwable> clazz, String message) {
Throwable ex = list.get(index);
if (!clazz.isInstance(ex)) {
AssertionError err = new AssertionError("Type " + clazz + " expected but got " + ex);
err.initCause(ex);
throw err;
}
if (!ObjectHelper.equals(message, ex.getMessage())) {
AssertionError err = new AssertionError("Message " + message + " expected but got " + ex.getMessage());
err.initCause(ex);
throw err;
}
}
public static void assertError(TestObserver<?> ts, int index, Class<? extends Throwable> clazz) {
Throwable ex = ts.errors().get(0);
try {
if (ex instanceof CompositeException) {
CompositeException ce = (CompositeException) ex;
List<Throwable> cel = ce.getExceptions();
assertTrue(cel.get(index).toString(), clazz.isInstance(cel.get(index)));
} else {
fail(ex.toString() + ": not a CompositeException");
}
} catch (AssertionError e) {
ex.printStackTrace();
throw e;
}
}
public static void assertError(TestSubscriber<?> ts, int index, Class<? extends Throwable> clazz) {
Throwable ex = ts.errors().get(0);
if (ex instanceof CompositeException) {
CompositeException ce = (CompositeException) ex;
List<Throwable> cel = ce.getExceptions();
assertTrue(cel.get(index).toString(), clazz.isInstance(cel.get(index)));
} else {
fail(ex.toString() + ": not a CompositeException");
}
}
public static void assertError(TestObserver<?> ts, int index, Class<? extends Throwable> clazz, String message) {
Throwable ex = ts.errors().get(0);
if (ex instanceof CompositeException) {
CompositeException ce = (CompositeException) ex;
List<Throwable> cel = ce.getExceptions();
assertTrue(cel.get(index).toString(), clazz.isInstance(cel.get(index)));
assertEquals(message, cel.get(index).getMessage());
} else {
fail(ex.toString() + ": not a CompositeException");
}
}
public static void assertError(TestSubscriber<?> ts, int index, Class<? extends Throwable> clazz, String message) {
Throwable ex = ts.errors().get(0);
if (ex instanceof CompositeException) {
CompositeException ce = (CompositeException) ex;
List<Throwable> cel = ce.getExceptions();
assertTrue(cel.get(index).toString(), clazz.isInstance(cel.get(index)));
assertEquals(message, cel.get(index).getMessage());
} else {
fail(ex.toString() + ": not a CompositeException");
}
}
/**
* Verify that a specific enum type has no enum constants.
* @param <E> the enum type
* @param e the enum class instance
*/
public static <E extends Enum<E>> void assertEmptyEnum(Class<E> e) {
assertEquals(0, e.getEnumConstants().length);
try {
try {
Method m0 = e.getDeclaredMethod("values");
Object[] a = (Object[])m0.invoke(null);
assertEquals(0, a.length);
Method m = e.getDeclaredMethod("valueOf", String.class);
m.invoke("INSTANCE");
fail("Should have thrown!");
} catch (InvocationTargetException ex) {
fail(ex.toString());
} catch (IllegalAccessException ex) {
fail(ex.toString());
} catch (IllegalArgumentException ex) {
// we expected this
}
} catch (NoSuchMethodException ex) {
fail(ex.toString());
}
}
/**
* Assert that by consuming the Publisher with a bad request amount, it is
* reported to the plugin error handler promptly.
* @param source the source to consume
*/
public static void assertBadRequestReported(Publisher<?> source) {
List<Throwable> list = trackPluginErrors();
try {
final CountDownLatch cdl = new CountDownLatch(1);
source.subscribe(new Subscriber<Object>() {
@Override
public void onSubscribe(Subscription s) {
try {
s.request(-99);
s.cancel();
s.cancel();
} finally {
cdl.countDown();
}
}
@Override
public void onNext(Object t) {
}
@Override
public void onError(Throwable t) {
}
@Override
public void onComplete() {
}
});
try {
assertTrue(cdl.await(5, TimeUnit.SECONDS));
} catch (InterruptedException ex) {
throw new AssertionError(ex.getMessage());
}
assertTrue(list.toString(), list.get(0) instanceof IllegalArgumentException);
assertEquals("n > 0 required but it was -99", list.get(0).getMessage());
} finally {
RxJavaPlugins.setErrorHandler(null);
}
}
/**
* Synchronizes the execution of two runnables (as much as possible)
* to test race conditions.
* <p>The method blocks until both have run to completion.
* @param r1 the first runnable
* @param r2 the second runnable
*/
public static void race(final Runnable r1, final Runnable r2) {
race(r1, r2, Schedulers.single());
}
/**
* Synchronizes the execution of two runnables (as much as possible)
* to test race conditions.
* <p>The method blocks until both have run to completion.
* @param r1 the first runnable
* @param r2 the second runnable
* @param s the scheduler to use
*/
public static void race(final Runnable r1, final Runnable r2, Scheduler s) {
final AtomicInteger count = new AtomicInteger(2);
final CountDownLatch cdl = new CountDownLatch(2);
final Throwable[] errors = { null, null };
s.scheduleDirect(new Runnable() {
@Override
public void run() {
if (count.decrementAndGet() != 0) {
while (count.get() != 0) { }
}
try {
try {
r1.run();
} catch (Throwable ex) {
errors[0] = ex;
}
} finally {
cdl.countDown();
}
}
});
if (count.decrementAndGet() != 0) {
while (count.get() != 0) { }
}
try {
try {
r2.run();
} catch (Throwable ex) {
errors[1] = ex;
}
} finally {
cdl.countDown();
}
try {
if (!cdl.await(5, TimeUnit.SECONDS)) {
throw new AssertionError("The wait timed out!");
}
} catch (InterruptedException ex) {
throw new RuntimeException(ex);
}
if (errors[0] != null && errors[1] == null) {
throw ExceptionHelper.wrapOrThrow(errors[0]);
}
if (errors[0] == null && errors[1] != null) {
throw ExceptionHelper.wrapOrThrow(errors[1]);
}
if (errors[0] != null && errors[1] != null) {
throw new CompositeException(errors);
}
}
/**
* Cast the given Throwable to CompositeException and returns its inner
* Throwable list.
* @param ex the target Throwable
* @return the list of Throwables
*/
public static List<Throwable> compositeList(Throwable ex) {
return ((CompositeException)ex).getExceptions();
}
/**
* Assert that the offer methods throw UnsupportedOperationExcetpion.
* @param q the queue implementation
*/
public static void assertNoOffer(SimpleQueue<?> q) {
try {
q.offer(null);
fail("Should have thrown!");
} catch (UnsupportedOperationException ex) {
// expected
}
try {
q.offer(null, null);
fail("Should have thrown!");
} catch (UnsupportedOperationException ex) {
// expected
}
}
@SuppressWarnings("unchecked")
public static <E extends Enum<E>> void checkEnum(Class<E> enumClass) {
try {
Method m = enumClass.getMethod("values");
m.setAccessible(true);
Method e = enumClass.getMethod("valueOf", String.class);
m.setAccessible(true);
for (Enum<E> o : (Enum<E>[])m.invoke(null)) {
assertSame(o, e.invoke(null, o.name()));
}
} catch (Throwable ex) {
throw ExceptionHelper.wrapOrThrow(ex);
}
}
/**
* Returns an Consumer that asserts the TestSubscriber has exaclty one value + completed
* normally and that single value is not the value specified.
* @param <T> the value type
* @param value the value not expected
* @return the consumer
*/
public static <T> Consumer<TestSubscriber<T>> subscriberSingleNot(final T value) {
return new Consumer<TestSubscriber<T>>() {
@Override
public void accept(TestSubscriber<T> ts) throws Exception {
ts
.assertSubscribed()
.assertValueCount(1)
.assertNoErrors()
.assertComplete();
T v = ts.values().get(0);
assertNotEquals(value, v);
}
};
}
/**
* Returns an Consumer that asserts the TestObserver has exaclty one value + completed
* normally and that single value is not the value specified.
* @param <T> the value type
* @param value the value not expected
* @return the consumer
*/
public static <T> Consumer<TestObserver<T>> observerSingleNot(final T value) {
return new Consumer<TestObserver<T>>() {
@Override
public void accept(TestObserver<T> ts) throws Exception {
ts
.assertSubscribed()
.assertValueCount(1)
.assertNoErrors()
.assertComplete();
T v = ts.values().get(0);
assertNotEquals(value, v);
}
};
}
/**
* Calls onSubscribe twice and checks if it doesn't affect the first Subscription while
* reporting it to plugin error handler.
* @param subscriber the target
*/
public static void doubleOnSubscribe(Subscriber<?> subscriber) {
List<Throwable> errors = trackPluginErrors();
try {
BooleanSubscription s1 = new BooleanSubscription();
subscriber.onSubscribe(s1);
BooleanSubscription s2 = new BooleanSubscription();
subscriber.onSubscribe(s2);
assertFalse(s1.isCancelled());
assertTrue(s2.isCancelled());
assertError(errors, 0, IllegalStateException.class, "Subscription already set!");
} finally {
RxJavaPlugins.reset();
}
}
/**
* Calls onSubscribe twice and checks if it doesn't affect the first Disposable while
* reporting it to plugin error handler.
* @param subscriber the target
*/
public static void doubleOnSubscribe(Observer<?> subscriber) {
List<Throwable> errors = trackPluginErrors();
try {
Disposable d1 = Disposables.empty();
subscriber.onSubscribe(d1);
Disposable d2 = Disposables.empty();
subscriber.onSubscribe(d2);
assertFalse(d1.isDisposed());
assertTrue(d2.isDisposed());
assertError(errors, 0, IllegalStateException.class, "Disposable already set!");
} finally {
RxJavaPlugins.reset();
}
}
/**
* Calls onSubscribe twice and checks if it doesn't affect the first Disposable while
* reporting it to plugin error handler.
* @param subscriber the target
*/
public static void doubleOnSubscribe(SingleObserver<?> subscriber) {
List<Throwable> errors = trackPluginErrors();
try {
Disposable d1 = Disposables.empty();
subscriber.onSubscribe(d1);
Disposable d2 = Disposables.empty();
subscriber.onSubscribe(d2);
assertFalse(d1.isDisposed());
assertTrue(d2.isDisposed());
assertError(errors, 0, IllegalStateException.class, "Disposable already set!");
} finally {
RxJavaPlugins.reset();
}
}
/**
* Calls onSubscribe twice and checks if it doesn't affect the first Disposable while
* reporting it to plugin error handler.
* @param subscriber the target
*/
public static void doubleOnSubscribe(CompletableObserver subscriber) {
List<Throwable> errors = trackPluginErrors();
try {
Disposable d1 = Disposables.empty();
subscriber.onSubscribe(d1);
Disposable d2 = Disposables.empty();
subscriber.onSubscribe(d2);
assertFalse(d1.isDisposed());
assertTrue(d2.isDisposed());
assertError(errors, 0, IllegalStateException.class, "Disposable already set!");
} finally {
RxJavaPlugins.reset();
}
}
/**
* Calls onSubscribe twice and checks if it doesn't affect the first Disposable while
* reporting it to plugin error handler.
* @param subscriber the target
*/
public static void doubleOnSubscribe(MaybeObserver<?> subscriber) {
List<Throwable> errors = trackPluginErrors();
try {
Disposable d1 = Disposables.empty();
subscriber.onSubscribe(d1);
Disposable d2 = Disposables.empty();
subscriber.onSubscribe(d2);
assertFalse(d1.isDisposed());
assertTrue(d2.isDisposed());
assertError(errors, 0, IllegalStateException.class, "Disposable already set!");
} finally {
RxJavaPlugins.reset();
}
}
/**
* Checks if the upstream's Subscription sent through the onSubscribe reports
* isCancelled properly before and after calling dispose.
* @param source the source to test
*/
public static void checkDisposed(Flowable<?> source) {
final TestSubscriber<Object> ts = new TestSubscriber<Object>(0L);
source.subscribe(new Subscriber<Object>() {
@Override
public void onSubscribe(Subscription s) {
ts.onSubscribe(new BooleanSubscription());
s.cancel();
s.cancel();
}
@Override
public void onNext(Object t) {
ts.onNext(t);
}
@Override
public void onError(Throwable t) {
ts.onError(t);
}
@Override
public void onComplete() {
ts.onComplete();
}
});
ts.assertEmpty();
}
/**
* Checks if the upstream's Disposable sent through the onSubscribe reports
* isDisposed properly before and after calling dispose.
* @param source the source to test
*/
public static void checkDisposed(Maybe<?> source) {
final Boolean[] b = { null, null };
final CountDownLatch cdl = new CountDownLatch(1);
source.subscribe(new MaybeObserver<Object>() {
@Override
public void onSubscribe(Disposable d) {
try {
b[0] = d.isDisposed();
d.dispose();
b[1] = d.isDisposed();
d.dispose();
} finally {
cdl.countDown();
}
}
@Override
public void onSuccess(Object value) {
// ignored
}
@Override
public void onError(Throwable e) {
// ignored
}
@Override
public void onComplete() {
// ignored
}
});
try {
assertTrue("Timed out", cdl.await(5, TimeUnit.SECONDS));
} catch (InterruptedException ex) {
throw ExceptionHelper.wrapOrThrow(ex);
}
assertEquals("Reports disposed upfront?", false, b[0]);
assertEquals("Didn't report disposed after?", true, b[1]);
}
/**
* Checks if the upstream's Disposable sent through the onSubscribe reports
* isDisposed properly before and after calling dispose.
* @param source the source to test
*/
public static void checkDisposed(Observable<?> source) {
final Boolean[] b = { null, null };
final CountDownLatch cdl = new CountDownLatch(1);
source.subscribe(new Observer<Object>() {
@Override
public void onSubscribe(Disposable d) {
try {
b[0] = d.isDisposed();
d.dispose();
b[1] = d.isDisposed();
d.dispose();
} finally {
cdl.countDown();
}
}
@Override
public void onNext(Object value) {
// ignored
}
@Override
public void onError(Throwable e) {
// ignored
}
@Override
public void onComplete() {
// ignored
}
});
try {
assertTrue("Timed out", cdl.await(5, TimeUnit.SECONDS));
} catch (InterruptedException ex) {
throw ExceptionHelper.wrapOrThrow(ex);
}
assertEquals("Reports disposed upfront?", false, b[0]);
assertEquals("Didn't report disposed after?", true, b[1]);
}
/**
* Checks if the upstream's Disposable sent through the onSubscribe reports
* isDisposed properly before and after calling dispose.
* @param source the source to test
*/
public static void checkDisposed(Single<?> source) {
final Boolean[] b = { null, null };
final CountDownLatch cdl = new CountDownLatch(1);
source.subscribe(new SingleObserver<Object>() {
@Override
public void onSubscribe(Disposable d) {
try {
b[0] = d.isDisposed();
d.dispose();
b[1] = d.isDisposed();
d.dispose();
} finally {
cdl.countDown();
}
}
@Override
public void onSuccess(Object value) {
// ignored
}
@Override
public void onError(Throwable e) {
// ignored
}
});
try {
assertTrue("Timed out", cdl.await(5, TimeUnit.SECONDS));
} catch (InterruptedException ex) {
throw ExceptionHelper.wrapOrThrow(ex);
}
assertEquals("Reports disposed upfront?", false, b[0]);
assertEquals("Didn't report disposed after?", true, b[1]);
}
/**
* Checks if the upstream's Disposable sent through the onSubscribe reports
* isDisposed properly before and after calling dispose.
* @param source the source to test
*/
public static void checkDisposed(Completable source) {
final Boolean[] b = { null, null };
final CountDownLatch cdl = new CountDownLatch(1);
source.subscribe(new CompletableObserver() {
@Override
public void onSubscribe(Disposable d) {
try {
b[0] = d.isDisposed();
d.dispose();
b[1] = d.isDisposed();
d.dispose();
} finally {
cdl.countDown();
}
}
@Override
public void onError(Throwable e) {
// ignored
}
@Override
public void onComplete() {
// ignored
}
});
try {
assertTrue("Timed out", cdl.await(5, TimeUnit.SECONDS));
} catch (InterruptedException ex) {
throw ExceptionHelper.wrapOrThrow(ex);
}
assertEquals("Reports disposed upfront?", false, b[0]);
assertEquals("Didn't report disposed after?", true, b[1]);
}
/**
* Consumer for all base reactive types.
*/
enum NoOpConsumer implements Subscriber<Object>, Observer<Object>, MaybeObserver<Object>, SingleObserver<Object>, CompletableObserver {
INSTANCE;
@Override
public void onSubscribe(Disposable d) {
// deliberately no-op
}
@Override
public void onSuccess(Object value) {
// deliberately no-op
}
@Override
public void onError(Throwable e) {
// deliberately no-op
}
@Override
public void onComplete() {
// deliberately no-op
}
@Override
public void onSubscribe(Subscription s) {
// deliberately no-op
}
@Override
public void onNext(Object t) {
// deliberately no-op
}
}
/**
* Check if the given transformed reactive type reports multiple onSubscribe calls to
* RxJavaPlugins.
* @param <T> the input value type
* @param <R> the output value type
* @param transform the transform to drive an operator
*/
public static <T, R> void checkDoubleOnSubscribeMaybe(Function<Maybe<T>, ? extends MaybeSource<R>> transform) {
List<Throwable> errors = trackPluginErrors();
try {
final Boolean[] b = { null, null };
final CountDownLatch cdl = new CountDownLatch(1);
Maybe<T> source = new Maybe<T>() {
@Override
protected void subscribeActual(MaybeObserver<? super T> observer) {
try {
Disposable d1 = Disposables.empty();
observer.onSubscribe(d1);
Disposable d2 = Disposables.empty();
observer.onSubscribe(d2);
b[0] = d1.isDisposed();
b[1] = d2.isDisposed();
} finally {
cdl.countDown();
}
}
};
MaybeSource<R> out = transform.apply(source);
out.subscribe(NoOpConsumer.INSTANCE);
try {
assertTrue("Timed out", cdl.await(5, TimeUnit.SECONDS));
} catch (InterruptedException ex) {
throw ExceptionHelper.wrapOrThrow(ex);
}
assertEquals("First disposed?", false, b[0]);
assertEquals("Second not disposed?", true, b[1]);
assertError(errors, 0, IllegalStateException.class, "Disposable already set!");
} catch (Throwable ex) {
throw ExceptionHelper.wrapOrThrow(ex);
} finally {
RxJavaPlugins.reset();
}
}
/**
* Check if the given transformed reactive type reports multiple onSubscribe calls to
* RxJavaPlugins.
* @param <T> the input value type
* @param <R> the output value type
* @param transform the transform to drive an operator
*/
public static <T, R> void checkDoubleOnSubscribeMaybeToSingle(Function<Maybe<T>, ? extends SingleSource<R>> transform) {
List<Throwable> errors = trackPluginErrors();
try {
final Boolean[] b = { null, null };
final CountDownLatch cdl = new CountDownLatch(1);
Maybe<T> source = new Maybe<T>() {
@Override
protected void subscribeActual(MaybeObserver<? super T> observer) {
try {
Disposable d1 = Disposables.empty();
observer.onSubscribe(d1);
Disposable d2 = Disposables.empty();
observer.onSubscribe(d2);
b[0] = d1.isDisposed();
b[1] = d2.isDisposed();
} finally {
cdl.countDown();
}
}
};
SingleSource<R> out = transform.apply(source);
out.subscribe(NoOpConsumer.INSTANCE);
try {
assertTrue("Timed out", cdl.await(5, TimeUnit.SECONDS));
} catch (InterruptedException ex) {
throw ExceptionHelper.wrapOrThrow(ex);
}
assertEquals("First disposed?", false, b[0]);
assertEquals("Second not disposed?", true, b[1]);
assertError(errors, 0, IllegalStateException.class, "Disposable already set!");
} catch (Throwable ex) {
throw ExceptionHelper.wrapOrThrow(ex);
} finally {
RxJavaPlugins.reset();
}
}
/**
* Check if the given transformed reactive type reports multiple onSubscribe calls to
* RxJavaPlugins.
* @param <T> the input value type
* @param <R> the output value type
* @param transform the transform to drive an operator
*/
public static <T, R> void checkDoubleOnSubscribeMaybeToObservable(Function<Maybe<T>, ? extends ObservableSource<R>> transform) {
List<Throwable> errors = trackPluginErrors();
try {
final Boolean[] b = { null, null };
final CountDownLatch cdl = new CountDownLatch(1);
Maybe<T> source = new Maybe<T>() {
@Override
protected void subscribeActual(MaybeObserver<? super T> observer) {
try {
Disposable d1 = Disposables.empty();
observer.onSubscribe(d1);
Disposable d2 = Disposables.empty();
observer.onSubscribe(d2);