@Test public void testRefCount() { TestScheduler s = new TestScheduler(); Observable<Long> interval = Observable.interval(100, TimeUnit.MILLISECONDS, s).publish().refCount(); // subscribe list1 final List<Long> list1 = new ArrayList<Long>(); Subscription s1 = interval.subscribe( new Action1<Long>() { @Override public void call(Long t1) { list1.add(t1); } }); s.advanceTimeBy(200, TimeUnit.MILLISECONDS); assertEquals(2, list1.size()); assertEquals(0L, list1.get(0).longValue()); assertEquals(1L, list1.get(1).longValue()); // subscribe list2 final List<Long> list2 = new ArrayList<Long>(); Subscription s2 = interval.subscribe( new Action1<Long>() { @Override public void call(Long t1) { list2.add(t1); } }); s.advanceTimeBy(300, TimeUnit.MILLISECONDS); // list 1 should have 5 items assertEquals(5, list1.size()); assertEquals(2L, list1.get(2).longValue()); assertEquals(3L, list1.get(3).longValue()); assertEquals(4L, list1.get(4).longValue()); // list 2 should only have 3 items assertEquals(3, list2.size()); assertEquals(2L, list2.get(0).longValue()); assertEquals(3L, list2.get(1).longValue()); assertEquals(4L, list2.get(2).longValue()); // unsubscribe list1 s1.unsubscribe(); // advance further s.advanceTimeBy(300, TimeUnit.MILLISECONDS); // list 1 should still have 5 items assertEquals(5, list1.size()); // list 2 should have 6 items assertEquals(6, list2.size()); assertEquals(5L, list2.get(3).longValue()); assertEquals(6L, list2.get(4).longValue()); assertEquals(7L, list2.get(5).longValue()); // unsubscribe list2 s2.unsubscribe(); // advance further s.advanceTimeBy(1000, TimeUnit.MILLISECONDS); // subscribing a new one should start over because the source should have been unsubscribed // subscribe list3 final List<Long> list3 = new ArrayList<Long>(); Subscription s3 = interval.subscribe( new Action1<Long>() { @Override public void call(Long t1) { list3.add(t1); } }); s.advanceTimeBy(200, TimeUnit.MILLISECONDS); assertEquals(2, list3.size()); assertEquals(0L, list3.get(0).longValue()); assertEquals(1L, list3.get(1).longValue()); }