/**
* 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.Mockito.*;
import java.util.ArrayList;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.atomic.AtomicInteger;
import org.junit.*;
import org.mockito.*;
import io.reactivex.*;
import io.reactivex.disposables.Disposable;
import io.reactivex.exceptions.TestException;
import io.reactivex.functions.*;
import io.reactivex.observers.*;
import io.reactivex.schedulers.Schedulers;
public class PublishSubjectTest {
@Test
public void testCompleted() {
PublishSubject<String> subject = PublishSubject.create();
Observer<String> observer = TestHelper.mockObserver();
subject.subscribe(observer);
subject.onNext("one");
subject.onNext("two");
subject.onNext("three");
subject.onComplete();
Observer<String> anotherSubscriber = TestHelper.mockObserver();
subject.subscribe(anotherSubscriber);
subject.onNext("four");
subject.onComplete();
subject.onError(new Throwable());
assertCompletedSubscriber(observer);
// todo bug? assertNeverSubscriber(anotherSubscriber);
}
@Test
public void testCompletedStopsEmittingData() {
PublishSubject<Object> channel = PublishSubject.create();
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);
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();
}
private void assertCompletedSubscriber(Observer<String> observer) {
verify(observer, times(1)).onNext("one");
verify(observer, times(1)).onNext("two");
verify(observer, times(1)).onNext("three");
verify(observer, Mockito.never()).onError(any(Throwable.class));
verify(observer, times(1)).onComplete();
}
@Test
public void testError() {
PublishSubject<String> subject = PublishSubject.create();
Observer<String> observer = TestHelper.mockObserver();
subject.subscribe(observer);
subject.onNext("one");
subject.onNext("two");
subject.onNext("three");
subject.onError(testException);
Observer<String> anotherSubscriber = TestHelper.mockObserver();
subject.subscribe(anotherSubscriber);
subject.onNext("four");
subject.onError(new Throwable());
subject.onComplete();
assertErrorSubscriber(observer);
// todo bug? assertNeverSubscriber(anotherSubscriber);
}
private void assertErrorSubscriber(Observer<String> observer) {
verify(observer, times(1)).onNext("one");
verify(observer, times(1)).onNext("two");
verify(observer, times(1)).onNext("three");
verify(observer, times(1)).onError(testException);
verify(observer, Mockito.never()).onComplete();
}
@Test
public void testSubscribeMidSequence() {
PublishSubject<String> subject = PublishSubject.create();
Observer<String> observer = TestHelper.mockObserver();
subject.subscribe(observer);
subject.onNext("one");
subject.onNext("two");
assertObservedUntilTwo(observer);
Observer<String> anotherSubscriber = TestHelper.mockObserver();
subject.subscribe(anotherSubscriber);
subject.onNext("three");
subject.onComplete();
assertCompletedSubscriber(observer);
assertCompletedStartingWithThreeSubscriber(anotherSubscriber);
}
private void assertCompletedStartingWithThreeSubscriber(Observer<String> observer) {
verify(observer, Mockito.never()).onNext("one");
verify(observer, Mockito.never()).onNext("two");
verify(observer, times(1)).onNext("three");
verify(observer, Mockito.never()).onError(any(Throwable.class));
verify(observer, times(1)).onComplete();
}
@Test
public void testUnsubscribeFirstSubscriber() {
PublishSubject<String> subject = PublishSubject.create();
Observer<String> observer = TestHelper.mockObserver();
TestObserver<String> ts = new TestObserver<String>(observer);
subject.subscribe(ts);
subject.onNext("one");
subject.onNext("two");
ts.dispose();
assertObservedUntilTwo(observer);
Observer<String> anotherSubscriber = TestHelper.mockObserver();
subject.subscribe(anotherSubscriber);
subject.onNext("three");
subject.onComplete();
assertObservedUntilTwo(observer);
assertCompletedStartingWithThreeSubscriber(anotherSubscriber);
}
private void assertObservedUntilTwo(Observer<String> observer) {
verify(observer, times(1)).onNext("one");
verify(observer, times(1)).onNext("two");
verify(observer, Mockito.never()).onNext("three");
verify(observer, Mockito.never()).onError(any(Throwable.class));
verify(observer, Mockito.never()).onComplete();
}
@Test
public void testNestedSubscribe() {
final PublishSubject<Integer> s = PublishSubject.create();
final AtomicInteger countParent = new AtomicInteger();
final AtomicInteger countChildren = new AtomicInteger();
final AtomicInteger countTotal = new AtomicInteger();
final ArrayList<String> list = new ArrayList<String>();
s.flatMap(new Function<Integer, Observable<String>>() {
@Override
public Observable<String> apply(final Integer v) {
countParent.incrementAndGet();
// then subscribe to subject again (it will not receive the previous value)
return s.map(new Function<Integer, String>() {
@Override
public String apply(Integer v2) {
countChildren.incrementAndGet();
return "Parent: " + v + " Child: " + v2;
}
});
}
}).subscribe(new Consumer<String>() {
@Override
public void accept(String v) {
countTotal.incrementAndGet();
list.add(v);
}
});
for (int i = 0; i < 10; i++) {
s.onNext(i);
}
s.onComplete();
// System.out.println("countParent: " + countParent.get());
// System.out.println("countChildren: " + countChildren.get());
// System.out.println("countTotal: " + countTotal.get());
// 9+8+7+6+5+4+3+2+1+0 == 45
assertEquals(45, list.size());
}
/**
* Should be able to unsubscribe all Subscribers, have it stop emitting, then subscribe new ones and it start emitting again.
*/
@Test
public void testReSubscribe() {
final PublishSubject<Integer> ps = PublishSubject.create();
Observer<Integer> o1 = TestHelper.mockObserver();
TestObserver<Integer> ts = new TestObserver<Integer>(o1);
ps.subscribe(ts);
// emit
ps.onNext(1);
// validate we got it
InOrder inOrder1 = inOrder(o1);
inOrder1.verify(o1, times(1)).onNext(1);
inOrder1.verifyNoMoreInteractions();
// unsubscribe
ts.dispose();
// emit again but nothing will be there to receive it
ps.onNext(2);
Observer<Integer> o2 = TestHelper.mockObserver();
TestObserver<Integer> ts2 = new TestObserver<Integer>(o2);
ps.subscribe(ts2);
// emit
ps.onNext(3);
// validate we got it
InOrder inOrder2 = inOrder(o2);
inOrder2.verify(o2, times(1)).onNext(3);
inOrder2.verifyNoMoreInteractions();
ts2.dispose();
}
private final Throwable testException = new Throwable();
@Test(timeout = 1000)
public void testUnsubscriptionCase() {
PublishSubject<String> src = PublishSubject.create();
for (int i = 0; i < 10; i++) {
final Observer<Object> o = TestHelper.mockObserver();
InOrder inOrder = inOrder(o);
String v = "" + i;
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();
}
});
src.onNext(v);
inOrder.verify(o).onNext(v + ", " + v);
inOrder.verify(o).onComplete();
verify(o, never()).onError(any(Throwable.class));
}
}
// FIXME RS subscribers are not allowed to throw
// @Test
// public void testOnErrorThrowsDoesntPreventDelivery() {
// PublishSubject<String> ps = PublishSubject.create();
//
// ps.subscribe();
// TestObserver<String> ts = new TestObserver<String>();
// 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() {
// PublishSubject<String> ps = PublishSubject.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 testCurrentStateMethodsNormal() {
PublishSubject<Object> as = PublishSubject.create();
assertFalse(as.hasThrowable());
assertFalse(as.hasComplete());
assertNull(as.getThrowable());
as.onNext(1);
assertFalse(as.hasThrowable());
assertFalse(as.hasComplete());
assertNull(as.getThrowable());
as.onComplete();
assertFalse(as.hasThrowable());
assertTrue(as.hasComplete());
assertNull(as.getThrowable());
}
@Test
public void testCurrentStateMethodsEmpty() {
PublishSubject<Object> as = PublishSubject.create();
assertFalse(as.hasThrowable());
assertFalse(as.hasComplete());
assertNull(as.getThrowable());
as.onComplete();
assertFalse(as.hasThrowable());
assertTrue(as.hasComplete());
assertNull(as.getThrowable());
}
@Test
public void testCurrentStateMethodsError() {
PublishSubject<Object> as = PublishSubject.create();
assertFalse(as.hasThrowable());
assertFalse(as.hasComplete());
assertNull(as.getThrowable());
as.onError(new TestException());
assertTrue(as.hasThrowable());
assertFalse(as.hasComplete());
assertTrue(as.getThrowable() instanceof TestException);
}
@Ignore("Observable doesn't do backpressure")
@Test
public void requestValidation() {
// TestHelper.assertBadRequestReported(PublishSubject.create());
}
@Test
public void crossCancel() {
final TestObserver<Integer> ts1 = new TestObserver<Integer>();
TestObserver<Integer> ts2 = new TestObserver<Integer>() {
@Override
public void onNext(Integer t) {
super.onNext(t);
ts1.cancel();
}
};
PublishSubject<Integer> pp = PublishSubject.create();
pp.subscribe(ts2);
pp.subscribe(ts1);
pp.onNext(1);
ts2.assertValue(1);
ts1.assertNoValues();
}
@Test
public void crossCancelOnError() {
final TestObserver<Integer> ts1 = new TestObserver<Integer>();
TestObserver<Integer> ts2 = new TestObserver<Integer>() {
@Override
public void onError(Throwable t) {
super.onError(t);
ts1.cancel();
}
};
PublishSubject<Integer> pp = PublishSubject.create();
pp.subscribe(ts2);
pp.subscribe(ts1);
pp.onError(new TestException());
ts2.assertError(TestException.class);
ts1.assertNoErrors();
}
@Test
public void crossCancelOnComplete() {
final TestObserver<Integer> ts1 = new TestObserver<Integer>();
TestObserver<Integer> ts2 = new TestObserver<Integer>() {
@Override
public void onComplete() {
super.onComplete();
ts1.cancel();
}
};
PublishSubject<Integer> pp = PublishSubject.create();
pp.subscribe(ts2);
pp.subscribe(ts1);
pp.onComplete();
ts2.assertComplete();
ts1.assertNotComplete();
}
@Test
@Ignore("Observable doesn't do backpressure")
public void backpressureOverflow() {
// PublishSubject<Integer> pp = PublishSubject.create();
//
// TestObserver<Integer> ts = pp.test(0L);
//
// pp.onNext(1);
//
// ts.assertNoValues()
// .assertNotComplete()
// .assertError(MissingBackpressureException.class)
// ;
}
@Test
public void onSubscribeCancelsImmediately() {
PublishSubject<Integer> pp = PublishSubject.create();
TestObserver<Integer> ts = pp.test();
pp.subscribe(new Observer<Integer>() {
@Override
public void onSubscribe(Disposable s) {
s.dispose();
s.dispose();
}
@Override
public void onNext(Integer t) {
}
@Override
public void onError(Throwable t) {
}
@Override
public void onComplete() {
}
});
ts.cancel();
assertFalse(pp.hasObservers());
}
@Test
public void terminateRace() throws Exception {
for (int i = 0; i < 100; i++) {
final PublishSubject<Integer> pp = PublishSubject.create();
TestObserver<Integer> ts = pp.test();
Runnable task = new Runnable() {
@Override
public void run() {
pp.onComplete();
}
};
TestHelper.race(task, task, Schedulers.io());
ts
.awaitDone(5, TimeUnit.SECONDS)
.assertResult();
}
}
@Test
public void addRemoveRance() throws Exception {
for (int i = 0; i < 100; i++) {
final PublishSubject<Integer> pp = PublishSubject.create();
final TestObserver<Integer> ts = pp.test();
Runnable r1 = new Runnable() {
@Override
public void run() {
pp.subscribe();
}
};
Runnable r2 = new Runnable() {
@Override
public void run() {
ts.cancel();
}
};
TestHelper.race(r1, r2, Schedulers.io());
}
}
@Test
public void addTerminateRance() throws Exception {
for (int i = 0; i < 100; i++) {
final PublishSubject<Integer> pp = PublishSubject.create();
Runnable r1 = new Runnable() {
@Override
public void run() {
pp.subscribe();
}
};
Runnable r2 = new Runnable() {
@Override
public void run() {
pp.onComplete();
}
};
TestHelper.race(r1, r2, Schedulers.io());
}
}
@Test
public void addCompleteRance() throws Exception {
for (int i = 0; i < 100; i++) {
final PublishSubject<Integer> pp = PublishSubject.create();
final TestObserver<Integer> ts = new TestObserver<Integer>();
Runnable r1 = new Runnable() {
@Override
public void run() {
pp.subscribe(ts);
}
};
Runnable r2 = new Runnable() {
@Override
public void run() {
pp.onComplete();
}
};
TestHelper.race(r1, r2, Schedulers.io());
ts.awaitDone(5, TimeUnit.SECONDS)
.assertResult();
}
}
@Test
public void subscribeToAfterComplete() {
PublishSubject<Integer> pp = PublishSubject.create();
pp.onComplete();
PublishSubject<Integer> pp2 = PublishSubject.create();
pp2.subscribe(pp);
assertFalse(pp2.hasObservers());
}
@Test
public void nullOnNext() {
PublishSubject<Integer> pp = PublishSubject.create();
TestObserver<Integer> ts = pp.test();
assertTrue(pp.hasObservers());
pp.onNext(null);
ts.assertFailure(NullPointerException.class);
}
@Test
public void nullOnError() {
PublishSubject<Integer> pp = PublishSubject.create();
TestObserver<Integer> ts = pp.test();
pp.onError(null);
ts.assertFailure(NullPointerException.class);
}
@Test
public void subscribedTo() {
PublishSubject<Integer> pp = PublishSubject.create();
PublishSubject<Integer> pp2 = PublishSubject.create();
pp.subscribe(pp2);
TestObserver<Integer> ts = pp2.test();
pp.onNext(1);
pp.onNext(2);
pp.onComplete();
ts.assertResult(1, 2);
}
@Test
public void onNextNull() {
final PublishSubject<Object> s = PublishSubject.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 PublishSubject<Object> s = PublishSubject.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.");
}
}