2.x: Fix Single.takeUntil, Maybe.takeUntil dispose behavior (#6019)

src/main/java/io/reactivex/internal/operators/maybe/MaybeTakeUntilPublisher.java

@@ -137,6 +137,7 @@ public void onSubscribe(Subscription s) {
 
             @Override
             public void onNext(Object value) {
+                SubscriptionHelper.cancel(this);
                 parent.otherComplete();
             }
 

src/main/java/io/reactivex/internal/operators/single/SingleTakeUntil.java

@@ -69,6 +69,7 @@ static final class TakeUntilMainObserver<T>
         @Override
         public void dispose() {
             DisposableHelper.dispose(this);
+            other.dispose();
         }
 
         @Override

src/test/java/io/reactivex/internal/operators/completable/CompletableAmbTest.java

@@ -186,4 +186,78 @@ public void ambRace() {
             RxJavaPlugins.reset();
         }
     }
+
+
+    @Test
+    public void untilCompletableMainComplete() {
+        CompletableSubject main = CompletableSubject.create();
+        CompletableSubject other = CompletableSubject.create();
+
+        TestObserver<Void> to = main.ambWith(other).test();
+
+        assertTrue("Main no observers?", main.hasObservers());
+        assertTrue("Other no observers?", other.hasObservers());
+
+        main.onComplete();
+
+        assertFalse("Main has observers?", main.hasObservers());
+        assertFalse("Other has observers?", other.hasObservers());
+
+        to.assertResult();
+    }
+
+    @Test
+    public void untilCompletableMainError() {
+        CompletableSubject main = CompletableSubject.create();
+        CompletableSubject other = CompletableSubject.create();
+
+        TestObserver<Void> to = main.ambWith(other).test();
+
+        assertTrue("Main no observers?", main.hasObservers());
+        assertTrue("Other no observers?", other.hasObservers());
+
+        main.onError(new TestException());
+
+        assertFalse("Main has observers?", main.hasObservers());
+        assertFalse("Other has observers?", other.hasObservers());
+
+        to.assertFailure(TestException.class);
+    }
+
+    @Test
+    public void untilCompletableOtherOnComplete() {
+        CompletableSubject main = CompletableSubject.create();
+        CompletableSubject other = CompletableSubject.create();
+
+        TestObserver<Void> to = main.ambWith(other).test();
+
+        assertTrue("Main no observers?", main.hasObservers());
+        assertTrue("Other no observers?", other.hasObservers());
+
+        other.onComplete();
+
+        assertFalse("Main has observers?", main.hasObservers());
+        assertFalse("Other has observers?", other.hasObservers());
+
+        to.assertResult();
+    }
+
+    @Test
+    public void untilCompletableOtherError() {
+        CompletableSubject main = CompletableSubject.create();
+        CompletableSubject other = CompletableSubject.create();
+
+        TestObserver<Void> to = main.ambWith(other).test();
+
+        assertTrue("Main no observers?", main.hasObservers());
+        assertTrue("Other no observers?", other.hasObservers());
+
+        other.onError(new TestException());
+
+        assertFalse("Main has observers?", main.hasObservers());
+        assertFalse("Other has observers?", other.hasObservers());
+
+        to.assertFailure(TestException.class);
+    }
+
 }

src/test/java/io/reactivex/internal/operators/flowable/FlowableTakeUntilTest.java

@@ -20,6 +20,7 @@
 import org.reactivestreams.*;
 
 import io.reactivex.*;
+import io.reactivex.exceptions.TestException;
 import io.reactivex.functions.Function;
 import io.reactivex.processors.PublishProcessor;
 import io.reactivex.subscribers.TestSubscriber;
@@ -293,4 +294,133 @@ public Flowable<Integer> apply(Flowable<Integer> c) throws Exception {
             }
         });
     }
+
+    @Test
+    public void untilPublisherMainSuccess() {
+        PublishProcessor<Integer> main = PublishProcessor.create();
+        PublishProcessor<Integer> other = PublishProcessor.create();
+
+        TestSubscriber<Integer> ts = main.takeUntil(other).test();
+
+        assertTrue("Main no subscribers?", main.hasSubscribers());
+        assertTrue("Other no subscribers?", other.hasSubscribers());
+
+        main.onNext(1);
+        main.onNext(2);
+        main.onComplete();
+
+        assertFalse("Main has subscribers?", main.hasSubscribers());
+        assertFalse("Other has subscribers?", other.hasSubscribers());
+
+        ts.assertResult(1, 2);
+    }
+
+    @Test
+    public void untilPublisherMainComplete() {
+        PublishProcessor<Integer> main = PublishProcessor.create();
+        PublishProcessor<Integer> other = PublishProcessor.create();
+
+        TestSubscriber<Integer> ts = main.takeUntil(other).test();
+
+        assertTrue("Main no subscribers?", main.hasSubscribers());
+        assertTrue("Other no subscribers?", other.hasSubscribers());
+
+        main.onComplete();
+
+        assertFalse("Main has subscribers?", main.hasSubscribers());
+        assertFalse("Other has subscribers?", other.hasSubscribers());
+
+        ts.assertResult();
+    }
+
+    @Test
+    public void untilPublisherMainError() {
+        PublishProcessor<Integer> main = PublishProcessor.create();
+        PublishProcessor<Integer> other = PublishProcessor.create();
+
+        TestSubscriber<Integer> ts = main.takeUntil(other).test();
+
+        assertTrue("Main no subscribers?", main.hasSubscribers());
+        assertTrue("Other no subscribers?", other.hasSubscribers());
+
+        main.onError(new TestException());
+
+        assertFalse("Main has subscribers?", main.hasSubscribers());
+        assertFalse("Other has subscribers?", other.hasSubscribers());
+
+        ts.assertFailure(TestException.class);
+    }
+
+    @Test
+    public void untilPublisherOtherOnNext() {
+        PublishProcessor<Integer> main = PublishProcessor.create();
+        PublishProcessor<Integer> other = PublishProcessor.create();
+
+        TestSubscriber<Integer> ts = main.takeUntil(other).test();
+
+        assertTrue("Main no subscribers?", main.hasSubscribers());
+        assertTrue("Other no subscribers?", other.hasSubscribers());
+
+        other.onNext(1);
+
+        assertFalse("Main has subscribers?", main.hasSubscribers());
+        assertFalse("Other has subscribers?", other.hasSubscribers());
+
+        ts.assertResult();
+    }
+
+    @Test
+    public void untilPublisherOtherOnComplete() {
+        PublishProcessor<Integer> main = PublishProcessor.create();
+        PublishProcessor<Integer> other = PublishProcessor.create();
+
+        TestSubscriber<Integer> ts = main.takeUntil(other).test();
+
+        assertTrue("Main no subscribers?", main.hasSubscribers());
+        assertTrue("Other no subscribers?", other.hasSubscribers());
+
+        other.onComplete();
+
+        assertFalse("Main has subscribers?", main.hasSubscribers());
+        assertFalse("Other has subscribers?", other.hasSubscribers());
+
+        ts.assertResult();
+    }
+
+    @Test
+    public void untilPublisherOtherError() {
+        PublishProcessor<Integer> main = PublishProcessor.create();
+        PublishProcessor<Integer> other = PublishProcessor.create();
+
+        TestSubscriber<Integer> ts = main.takeUntil(other).test();
+
+        assertTrue("Main no subscribers?", main.hasSubscribers());
+        assertTrue("Other no subscribers?", other.hasSubscribers());
+
+        other.onError(new TestException());
+
+        assertFalse("Main has subscribers?", main.hasSubscribers());
+        assertFalse("Other has subscribers?", other.hasSubscribers());
+
+        ts.assertFailure(TestException.class);
+    }
+
+    @Test
+    public void untilPublisherDispose() {
+        PublishProcessor<Integer> main = PublishProcessor.create();
+        PublishProcessor<Integer> other = PublishProcessor.create();
+
+        TestSubscriber<Integer> ts = main.takeUntil(other).test();
+
+        assertTrue("Main no subscribers?", main.hasSubscribers());
+        assertTrue("Other no subscribers?", other.hasSubscribers());
+
+        ts.dispose();
+
+        assertFalse("Main has subscribers?", main.hasSubscribers());
+        assertFalse("Other has subscribers?", other.hasSubscribers());
+
+        ts.assertEmpty();
+    }
+
 }