Avoiding OperatorObserveOn from calling subscriber.onNext(..) after unsu...

rxjava-core/src/main/java/rx/internal/operators/OperatorObserveOn.java

@@ -72,11 +72,13 @@ private static final class ObserveOnSubscriber<T> extends Subscriber<T> {
                 = AtomicLongFieldUpdater.newUpdater(ObserveOnSubscriber.class, "counter");
 
         public ObserveOnSubscriber(Scheduler scheduler, Subscriber<? super T> subscriber) {
-            super(subscriber);
             this.observer = subscriber;
             this.recursiveScheduler = scheduler.createWorker();
             this.scheduledUnsubscribe = new ScheduledUnsubscribe(recursiveScheduler);
-            subscriber.add(scheduledUnsubscribe);
+            add(scheduledUnsubscribe);
+
+            subscriber.add(recursiveScheduler);
+            subscriber.add(this);
         }
 
         @Override

rxjava-core/src/test/java/rx/internal/operators/OperatorObserveOnTest.java

@@ -40,6 +40,7 @@
 import rx.Observable;
 import rx.Observer;
 import rx.Scheduler;
+import rx.Subscription;
 import rx.exceptions.TestException;
 import rx.functions.Action0;
 import rx.functions.Action1;
@@ -389,4 +390,21 @@ public void testDelayedErrorDeliveryWhenSafeSubscriberUnsubscribes() {
         inOrder.verify(o, never()).onNext(anyInt());
         inOrder.verify(o, never()).onCompleted();
     }
+
+    @Test
+    public void testAfterUnsubscribeCalledThenObserverOnNextNeverCalled() {
+        final TestScheduler testScheduler = new TestScheduler();
+        final Observer<Integer> observer = mock(Observer.class);
+        final Subscription subscription = Observable.from(1, 2, 3)
+                .observeOn(testScheduler)
+                .subscribe(observer);
+        subscription.unsubscribe();
+        testScheduler.advanceTimeBy(1, TimeUnit.SECONDS);
+
+        final InOrder inOrder = inOrder(observer);
+
+        inOrder.verify(observer, never()).onNext(anyInt());
+        inOrder.verify(observer, never()).onError(any(Exception.class));
+        inOrder.verify(observer, never()).onCompleted();
+    }
 }