/**
* Copyright (c) 2016-present, RxJava Contributors.
*
* 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.subjects;
import static org.junit.Assert.*;
import static org.mockito.ArgumentMatchers.any;
import static org.mockito.Mockito.*;
import java.util.List;
import java.util.concurrent.*;
import java.util.concurrent.atomic.AtomicReference;
import org.junit.*;
import org.mockito.*;
import io.reactivex.*;
import io.reactivex.disposables.*;
import io.reactivex.exceptions.TestException;
import io.reactivex.functions.Function;
import io.reactivex.observers.*;
import io.reactivex.plugins.RxJavaPlugins;
import io.reactivex.schedulers.Schedulers;
public class BehaviorSubjectTest {
private final Throwable testException = new Throwable();
@Test
public void testThatSubscriberReceivesDefaultValueAndSubsequentEvents() {
BehaviorSubject<String> subject = BehaviorSubject.createDefault("default");
Observer<String> observer = TestHelper.mockObserver();
subject.subscribe(observer);
subject.onNext("one");
subject.onNext("two");
subject.onNext("three");
verify(observer, times(1)).onNext("default");
verify(observer, times(1)).onNext("one");
verify(observer, times(1)).onNext("two");
verify(observer, times(1)).onNext("three");
verify(observer, Mockito.never()).onError(testException);
verify(observer, Mockito.never()).onComplete();
}
@Test
public void testThatSubscriberReceivesLatestAndThenSubsequentEvents() {
BehaviorSubject<String> subject = BehaviorSubject.createDefault("default");
subject.onNext("one");
Observer<String> observer = TestHelper.mockObserver();
subject.subscribe(observer);
subject.onNext("two");
subject.onNext("three");
verify(observer, Mockito.never()).onNext("default");
verify(observer, times(1)).onNext("one");
verify(observer, times(1)).onNext("two");
verify(observer, times(1)).onNext("three");
verify(observer, Mockito.never()).onError(testException);
verify(observer, Mockito.never()).onComplete();
}
@Test
public void testSubscribeThenOnComplete() {
BehaviorSubject<String> subject = BehaviorSubject.createDefault("default");
Observer<String> observer = TestHelper.mockObserver();
subject.subscribe(observer);
subject.onNext("one");
subject.onComplete();
verify(observer, times(1)).onNext("default");
verify(observer, times(1)).onNext("one");
verify(observer, Mockito.never()).onError(any(Throwable.class));
verify(observer, times(1)).onComplete();
}
@Test
public void testSubscribeToCompletedOnlyEmitsOnComplete() {
BehaviorSubject<String> subject = BehaviorSubject.createDefault("default");
subject.onNext("one");
subject.onComplete();
Observer<String> observer = TestHelper.mockObserver();
subject.subscribe(observer);
verify(observer, never()).onNext("default");
verify(observer, never()).onNext("one");
verify(observer, Mockito.never()).onError(any(Throwable.class));
verify(observer, times(1)).onComplete();
}
@Test
public void testSubscribeToErrorOnlyEmitsOnError() {
BehaviorSubject<String> subject = BehaviorSubject.createDefault("default");
subject.onNext("one");
RuntimeException re = new RuntimeException("test error");
subject.onError(re);
Observer<String> observer = TestHelper.mockObserver();
subject.subscribe(observer);
verify(observer, never()).onNext("default");
verify(observer, never()).onNext("one");
verify(observer, times(1)).onError(re);
verify(observer, never()).onComplete();
}
@Test
public void testCompletedStopsEmittingData() {
BehaviorSubject<Integer> channel = BehaviorSubject.createDefault(2013);
Observer<Object> observerA = TestHelper.mockObserver();
Observer<Object> observerB = TestHelper.mockObserver();
Observer<Object> observerC = TestHelper.mockObserver();
TestObserver<Object> ts = new TestObserver<Object>(observerA);
channel.subscribe(ts);
channel.subscribe(observerB);
InOrder inOrderA = inOrder(observerA);
InOrder inOrderB = inOrder(observerB);
InOrder inOrderC = inOrder(observerC);
inOrderA.verify(observerA).onNext(2013);
inOrderB.verify(observerB).onNext(2013);
channel.onNext(42);
inOrderA.verify(observerA).onNext(42);
inOrderB.verify(observerB).onNext(42);
ts.dispose();
inOrderA.verifyNoMoreInteractions();
channel.onNext(4711);
inOrderB.verify(observerB).onNext(4711);
channel.onComplete();
inOrderB.verify(observerB).onComplete();
channel.subscribe(observerC);
inOrderC.verify(observerC).onComplete();
channel.onNext(13);
inOrderB.verifyNoMoreInteractions();
inOrderC.verifyNoMoreInteractions();
}
@Test
public void testCompletedAfterErrorIsNotSent() {
BehaviorSubject<String> subject = BehaviorSubject.createDefault("default");
Observer<String> observer = TestHelper.mockObserver();
subject.subscribe(observer);
subject.onNext("one");
subject.onError(testException);
subject.onNext("two");
subject.onComplete();
verify(observer, times(1)).onNext("default");
verify(observer, times(1)).onNext("one");
verify(observer, times(1)).onError(testException);
verify(observer, never()).onNext("two");
verify(observer, never()).onComplete();
}
@Test
public void testCompletedAfterErrorIsNotSent2() {
BehaviorSubject<String> subject = BehaviorSubject.createDefault("default");
Observer<String> observer = TestHelper.mockObserver();
subject.subscribe(observer);
subject.onNext("one");
subject.onError(testException);
subject.onNext("two");
subject.onComplete();
verify(observer, times(1)).onNext("default");
verify(observer, times(1)).onNext("one");
verify(observer, times(1)).onError(testException);
verify(observer, never()).onNext("two");
verify(observer, never()).onComplete();
Observer<Object> o2 = TestHelper.mockObserver();
subject.subscribe(o2);
verify(o2, times(1)).onError(testException);
verify(o2, never()).onNext(any());
verify(o2, never()).onComplete();
}
@Test
public void testCompletedAfterErrorIsNotSent3() {
BehaviorSubject<String> subject = BehaviorSubject.createDefault("default");
Observer<String> observer = TestHelper.mockObserver();
subject.subscribe(observer);
subject.onNext("one");
subject.onComplete();
subject.onNext("two");
subject.onComplete();
verify(observer, times(1)).onNext("default");
verify(observer, times(1)).onNext("one");
verify(observer, times(1)).onComplete();
verify(observer, never()).onError(any(Throwable.class));
verify(observer, never()).onNext("two");
Observer<Object> o2 = TestHelper.mockObserver();
subject.subscribe(o2);
verify(o2, times(1)).onComplete();
verify(o2, never()).onNext(any());
verify(observer, never()).onError(any(Throwable.class));
}
@Test(timeout = 1000)
public void testUnsubscriptionCase() {
BehaviorSubject<String> src = BehaviorSubject.createDefault("null"); // FIXME was plain null which is not allowed
for (int i = 0; i < 10; i++) {
final Observer<Object> o = TestHelper.mockObserver();
InOrder inOrder = inOrder(o);
String v = "" + i;
src.onNext(v);
System.out.printf("Turn: %d%n", i);
src.firstElement()
.toObservable()
.flatMap(new Function<String, Observable<String>>() {
@Override
public Observable<String> apply(String t1) {
return Observable.just(t1 + ", " + t1);
}
})
.subscribe(new DefaultObserver<String>() {
@Override
public void onNext(String t) {
o.onNext(t);
}
@Override
public void onError(Throwable e) {
o.onError(e);
}
@Override
public void onComplete() {
o.onComplete();
}
});
inOrder.verify(o).onNext(v + ", " + v);
inOrder.verify(o).onComplete();
verify(o, never()).onError(any(Throwable.class));
}
}
@Test
public void testStartEmpty() {
BehaviorSubject<Integer> source = BehaviorSubject.create();
final Observer<Object> o = TestHelper.mockObserver();
InOrder inOrder = inOrder(o);
source.subscribe(o);
inOrder.verify(o, never()).onNext(any());
inOrder.verify(o, never()).onComplete();
source.onNext(1);
source.onComplete();
source.onNext(2);
verify(o, never()).onError(any(Throwable.class));
inOrder.verify(o).onNext(1);
inOrder.verify(o).onComplete();
inOrder.verifyNoMoreInteractions();
}
@Test
public void testStartEmptyThenAddOne() {
BehaviorSubject<Integer> source = BehaviorSubject.create();
final Observer<Object> o = TestHelper.mockObserver();
InOrder inOrder = inOrder(o);
source.onNext(1);
source.subscribe(o);
inOrder.verify(o).onNext(1);
source.onComplete();
source.onNext(2);
inOrder.verify(o).onComplete();
inOrder.verifyNoMoreInteractions();
verify(o, never()).onError(any(Throwable.class));
}
@Test
public void testStartEmptyCompleteWithOne() {
BehaviorSubject<Integer> source = BehaviorSubject.create();
final Observer<Object> o = TestHelper.mockObserver();
source.onNext(1);
source.onComplete();
source.onNext(2);
source.subscribe(o);
verify(o).onComplete();
verify(o, never()).onError(any(Throwable.class));
verify(o, never()).onNext(any());
}
@Test
public void testTakeOneSubscriber() {
BehaviorSubject<Integer> source = BehaviorSubject.createDefault(1);
final Observer<Object> o = TestHelper.mockObserver();
source.take(1).subscribe(o);
verify(o).onNext(1);
verify(o).onComplete();
verify(o, never()).onError(any(Throwable.class));
assertEquals(0, source.subscriberCount());
assertFalse(source.hasObservers());
}
// FIXME RS subscribers are not allowed to throw
// @Test
// public void testOnErrorThrowsDoesntPreventDelivery() {
// BehaviorSubject<String> ps = BehaviorSubject.create();
//
// ps.subscribe();
// TestObserver<String> ts = new TestObserver<T>();
// ps.subscribe(ts);
//
// try {
// ps.onError(new RuntimeException("an exception"));
// fail("expect OnErrorNotImplementedException");
// } catch (OnErrorNotImplementedException e) {
// // ignore
// }
// // even though the onError above throws we should still receive it on the other subscriber
// assertEquals(1, ts.getOnErrorEvents().size());
// }
// FIXME RS subscribers are not allowed to throw
// /**
// * This one has multiple failures so should get a CompositeException
// */
// @Test
// public void testOnErrorThrowsDoesntPreventDelivery2() {
// BehaviorSubject<String> ps = BehaviorSubject.create();
//
// ps.subscribe();
// ps.subscribe();
// TestObserver<String> ts = new TestObserver<String>();
// ps.subscribe(ts);
// ps.subscribe();
// ps.subscribe();
// ps.subscribe();
//
// try {
// ps.onError(new RuntimeException("an exception"));
// fail("expect OnErrorNotImplementedException");
// } catch (CompositeException e) {
// // we should have 5 of them
// assertEquals(5, e.getExceptions().size());
// }
// // even though the onError above throws we should still receive it on the other subscriber
// assertEquals(1, ts.getOnErrorEvents().size());
// }
@Test
public void testEmissionSubscriptionRace() throws Exception {
Scheduler s = Schedulers.io();
Scheduler.Worker worker = Schedulers.io().createWorker();
try {
for (int i = 0; i < 50000; i++) {
if (i % 1000 == 0) {
System.out.println(i);
}
final BehaviorSubject<Object> rs = BehaviorSubject.create();
final CountDownLatch finish = new CountDownLatch(1);
final CountDownLatch start = new CountDownLatch(1);
worker.schedule(new Runnable() {
@Override
public void run() {
try {
start.await();
} catch (Exception e1) {
e1.printStackTrace();
}
rs.onNext(1);
}
});
final AtomicReference<Object> o = new AtomicReference<Object>();
rs.subscribeOn(s).observeOn(Schedulers.io())
.subscribe(new DefaultObserver<Object>() {
@Override
public void onComplete() {
o.set(-1);
finish.countDown();
}
@Override
public void onError(Throwable e) {
o.set(e);
finish.countDown();
}
@Override
public void onNext(Object t) {
o.set(t);
finish.countDown();
}
});
start.countDown();
if (!finish.await(5, TimeUnit.SECONDS)) {
System.out.println(o.get());
System.out.println(rs.hasObservers());
rs.onComplete();
Assert.fail("Timeout @ " + i);
break;
} else {
Assert.assertEquals(1, o.get());
worker.schedule(new Runnable() {
@Override
public void run() {
rs.onComplete();
}
});
}
}
} finally {
worker.dispose();
}
}
@Test
public void testCurrentStateMethodsNormalEmptyStart() {
BehaviorSubject<Object> as = BehaviorSubject.create();
assertFalse(as.hasValue());
assertFalse(as.hasThrowable());
assertFalse(as.hasComplete());
assertNull(as.getValue());
assertNull(as.getThrowable());
as.onNext(1);
assertTrue(as.hasValue());
assertFalse(as.hasThrowable());
assertFalse(as.hasComplete());
assertEquals(1, as.getValue());
assertNull(as.getThrowable());
as.onComplete();
assertFalse(as.hasValue());
assertFalse(as.hasThrowable());
assertTrue(as.hasComplete());
assertNull(as.getValue());
assertNull(as.getThrowable());
}
@Test
public void testCurrentStateMethodsNormalSomeStart() {
BehaviorSubject<Object> as = BehaviorSubject.createDefault((Object)1);
assertTrue(as.hasValue());
assertFalse(as.hasThrowable());
assertFalse(as.hasComplete());
assertEquals(1, as.getValue());
assertNull(as.getThrowable());
as.onNext(2);
assertTrue(as.hasValue());
assertFalse(as.hasThrowable());
assertFalse(as.hasComplete());
assertEquals(2, as.getValue());
assertNull(as.getThrowable());
as.onComplete();
assertFalse(as.hasValue());
assertFalse(as.hasThrowable());
assertTrue(as.hasComplete());
assertNull(as.getValue());
assertNull(as.getThrowable());
}
@Test
public void testCurrentStateMethodsEmpty() {
BehaviorSubject<Object> as = BehaviorSubject.create();
assertFalse(as.hasValue());
assertFalse(as.hasThrowable());
assertFalse(as.hasComplete());
assertNull(as.getValue());
assertNull(as.getThrowable());
as.onComplete();
assertFalse(as.hasValue());
assertFalse(as.hasThrowable());
assertTrue(as.hasComplete());
assertNull(as.getValue());
assertNull(as.getThrowable());
}
@Test
public void testCurrentStateMethodsError() {
BehaviorSubject<Object> as = BehaviorSubject.create();
assertFalse(as.hasValue());
assertFalse(as.hasThrowable());
assertFalse(as.hasComplete());
assertNull(as.getValue());
assertNull(as.getThrowable());
as.onError(new TestException());
assertFalse(as.hasValue());
assertTrue(as.hasThrowable());
assertFalse(as.hasComplete());
assertNull(as.getValue());
assertTrue(as.getThrowable() instanceof TestException);
}
@Test
public void onNextNull() {
final BehaviorSubject<Object> s = BehaviorSubject.create();
s.onNext(null);
s.test()
.assertNoValues()
.assertError(NullPointerException.class)
.assertErrorMessage("onNext called with null. Null values are generally not allowed in 2.x operators and sources.");
}
@Test
public void onErrorNull() {
final BehaviorSubject<Object> s = BehaviorSubject.create();
s.onError(null);
s.test()
.assertNoValues()
.assertError(NullPointerException.class)
.assertErrorMessage("onError called with null. Null values are generally not allowed in 2.x operators and sources.");
}
@Test
public void onNextNullDelayed() {
final BehaviorSubject<Object> p = BehaviorSubject.create();
TestObserver<Object> ts = p.test();
assertTrue(p.hasObservers());
p.onNext(null);
assertFalse(p.hasObservers());
ts
.assertNoValues()
.assertError(NullPointerException.class)
.assertErrorMessage("onNext called with null. Null values are generally not allowed in 2.x operators and sources.");
}
@Test
public void onErrorNullDelayed() {
final BehaviorSubject<Object> p = BehaviorSubject.create();
TestObserver<Object> ts = p.test();
assertTrue(p.hasObservers());
p.onError(null);
assertFalse(p.hasObservers());
ts
.assertNoValues()
.assertError(NullPointerException.class)
.assertErrorMessage("onError called with null. Null values are generally not allowed in 2.x operators and sources.");
}
@Test
public void cancelOnArrival() {
BehaviorSubject<Object> p = BehaviorSubject.create();
assertFalse(p.hasObservers());
p.test(true).assertEmpty();
assertFalse(p.hasObservers());
}
@Test
public void onSubscribe() {
BehaviorSubject<Object> p = BehaviorSubject.create();
Disposable bs = Disposables.empty();
p.onSubscribe(bs);
assertFalse(bs.isDisposed());
p.onComplete();
bs = Disposables.empty();
p.onSubscribe(bs);
assertTrue(bs.isDisposed());
}
@Test
public void onErrorAfterComplete() {
BehaviorSubject<Object> p = BehaviorSubject.create();
p.onComplete();
List<Throwable> errors = TestHelper.trackPluginErrors();
try {
p.onError(new TestException());
TestHelper.assertUndeliverable(errors, 0, TestException.class);
} finally {
RxJavaPlugins.reset();
}
}
@Test
public void cancelOnArrival2() {
BehaviorSubject<Object> p = BehaviorSubject.create();
TestObserver<Object> ts = p.test();
p.test(true).assertEmpty();
p.onNext(1);
p.onComplete();
ts.assertResult(1);
}
@Test
public void addRemoveRace() {
for (int i = 0; i < 500; i++) {
final BehaviorSubject<Object> p = BehaviorSubject.create();
final TestObserver<Object> ts = p.test();
Runnable r1 = new Runnable() {
@Override
public void run() {
p.test();
}
};
Runnable r2 = new Runnable() {
@Override
public void run() {
ts.cancel();
}
};
TestHelper.race(r1, r2, Schedulers.single());
}
}
@SuppressWarnings({ "rawtypes", "unchecked" })
@Test
public void subscribeOnNextRace() {
for (int i = 0; i < 500; i++) {
final BehaviorSubject<Object> p = BehaviorSubject.createDefault((Object)1);
final TestObserver[] ts = { null };
Runnable r1 = new Runnable() {
@Override
public void run() {
ts[0] = p.test();
}
};
Runnable r2 = new Runnable() {
@Override
public void run() {
p.onNext(2);
}
};
TestHelper.race(r1, r2, Schedulers.single());
if (ts[0].valueCount() == 1) {
ts[0].assertValue(2).assertNoErrors().assertNotComplete();
} else {
ts[0].assertValues(1, 2).assertNoErrors().assertNotComplete();
}
}
}
@Test
public void innerDisposed() {
BehaviorSubject.create()
.subscribe(new Observer<Object>() {
@Override
public void onSubscribe(Disposable d) {
assertFalse(d.isDisposed());
d.dispose();
assertTrue(d.isDisposed());
}
@Override
public void onNext(Object value) {
}
@Override
public void onError(Throwable e) {
}
@Override
public void onComplete() {
}
});
}
@Test
public void completeSubscribeRace() throws Exception {
for (int i = 0; i < 1000; i++) {
final BehaviorSubject<Object> p = BehaviorSubject.create();
final TestObserver<Object> ts = new TestObserver<Object>();
Runnable r1 = new Runnable() {
@Override
public void run() {
p.subscribe(ts);
}
};
Runnable r2 = new Runnable() {
@Override
public void run() {
p.onComplete();
}
};
TestHelper.race(r1, r2);
ts.assertResult();
}
}
@Test
public void errorSubscribeRace() throws Exception {
for (int i = 0; i < 1000; i++) {
final BehaviorSubject<Object> p = BehaviorSubject.create();
final TestObserver<Object> ts = new TestObserver<Object>();
final TestException ex = new TestException();
Runnable r1 = new Runnable() {
@Override
public void run() {
p.subscribe(ts);
}
};
Runnable r2 = new Runnable() {
@Override
public void run() {
p.onError(ex);
}
};
TestHelper.race(r1, r2);
ts.assertFailure(TestException.class);
}
}
}