@Test
public void testDefer() throws Throwable {
Supplier<Observable<String>> factory = mock(Supplier.class);
Observable<String> firstObservable = Observable.just("one", "two");
Observable<String> secondObservable = Observable.just("three", "four");
when(factory.get()).thenReturn(firstObservable, secondObservable);
Observable<String> deferred = Observable.defer(factory);
verifyZeroInteractions(factory);
Subscriber<String> firstObserver = TestHelper.mockSubscriber();
deferred.subscribe(firstObserver);
verify(factory, times(1)).get();
verify(firstObserver, times(1)).onNext("one");
verify(firstObserver, times(1)).onNext("two");
verify(firstObserver, times(0)).onNext("three");
verify(firstObserver, times(0)).onNext("four");
verify(firstObserver, times(1)).onComplete();
Subscriber<String> secondObserver = TestHelper.mockSubscriber();
deferred.subscribe(secondObserver);
verify(factory, times(2)).get();
verify(secondObserver, times(0)).onNext("one");
verify(secondObserver, times(0)).onNext("two");
verify(secondObserver, times(1)).onNext("three");
verify(secondObserver, times(1)).onNext("four");
verify(secondObserver, times(1)).onComplete();
}
@Test
public void testTakeWithErrorInObserver() {
final AtomicInteger count = new AtomicInteger();
final AtomicReference<Throwable> error = new AtomicReference<>();
Observable.just("1", "2", "three", "4")
.take(3)
.safeSubscribe(
new Observer<String>() {
@Override
public void onComplete() {
System.out.println("completed");
}
@Override
public void onError(Throwable e) {
error.set(e);
System.out.println("error");
e.printStackTrace();
}
@Override
public void onNext(String v) {
int num = Integer.parseInt(v);
System.out.println(num);
// doSomething(num);
count.incrementAndGet();
}
});
assertEquals(2, count.get());
assertNotNull(error.get());
if (!(error.get() instanceof NumberFormatException)) {
fail("It should be a NumberFormatException");
}
}
/**
* The error from the user provided Observable is handled by the subscribe try/catch because this
* is synchronous
*
* <p>Result: Passes
*/
@Test
public void testCustomObservableWithErrorInObservableSynchronous() {
final AtomicInteger count = new AtomicInteger();
final AtomicReference<Throwable> error = new AtomicReference<>();
// FIXME custom built???
Observable.just("1", "2")
.concatWith(Observable.error(() -> new NumberFormatException()))
.subscribe(
new Observer<String>() {
@Override
public void onComplete() {
System.out.println("completed");
}
@Override
public void onError(Throwable e) {
error.set(e);
System.out.println("error");
e.printStackTrace();
}
@Override
public void onNext(String v) {
System.out.println(v);
count.incrementAndGet();
}
});
assertEquals(2, count.get());
assertNotNull(error.get());
if (!(error.get() instanceof NumberFormatException)) {
fail("It should be a NumberFormatException");
}
}
@Test
public void fromArityArgs1() {
Observable<String> items = Observable.just("one");
assertEquals((Long) 1L, items.count().toBlocking().single());
assertEquals("one", items.takeLast(1).toBlocking().single());
}
@Test
public void testAwaitTerminalEventWithDuration() {
TestSubscriber<Object> ts = new TestSubscriber<Object>();
Observable.just(1).subscribe(ts);
ts.awaitTerminalEvent(1, TimeUnit.SECONDS);
ts.assertTerminalEvent();
}
@Test
public void testCompose() {
TestSubscriber<String> ts = new TestSubscriber<>();
Observable.just(1, 2, 3).compose(t1 -> t1.map(String::valueOf)).subscribe(ts);
ts.assertTerminated();
ts.assertNoErrors();
ts.assertValues("1", "2", "3");
}
@Test
public void testReduceWithInitialValue() {
Observable<Integer> observable = Observable.just(1, 2, 3, 4);
observable.reduce(50, (t1, t2) -> t1 + t2).subscribe(w);
// we should be called only once
verify(w, times(1)).onNext(anyInt());
verify(w).onNext(60);
}
@Test
public void testFirstWithPredicateOfNoneMatchingThePredicate() {
Observable<Integer> observable = Observable.just(1, 3, 5, 7, 9, 7, 5, 3, 1);
observable.filter(IS_EVEN).first().subscribe(w);
verify(w, never()).onNext(anyInt());
verify(w, never()).onComplete();
verify(w, times(1)).onError(isA(NoSuchElementException.class));
}
@Test
public void testTakeFirstWithPredicateOfNoneMatchingThePredicate() {
Observable<Integer> observable = Observable.just(1, 3, 5, 7, 9, 7, 5, 3, 1);
observable.takeFirst(IS_EVEN).subscribe(w);
verify(w, never()).onNext(anyInt());
verify(w, times(1)).onComplete();
verify(w, never()).onError(any(Throwable.class));
}
public void testTakeFirstWithPredicateOfSome() {
Observable<Integer> observable = Observable.just(1, 3, 5, 4, 6, 3);
observable.takeFirst(IS_EVEN).subscribe(w);
verify(w, times(1)).onNext(anyInt());
verify(w).onNext(4);
verify(w, times(1)).onComplete();
verify(w, never()).onError(any(Throwable.class));
}
@Test
public void testTakeFirstOfSome() {
Observable<Integer> observable = Observable.just(1, 2, 3);
observable.take(1).subscribe(w);
verify(w, times(1)).onNext(anyInt());
verify(w).onNext(1);
verify(w, times(1)).onComplete();
verify(w, never()).onError(any(Throwable.class));
}
@Test
public void testIgnoreElements() {
Observable<Integer> observable = Observable.just(1, 2, 3).ignoreElements();
Subscriber<Object> observer = TestHelper.mockSubscriber();
observable.subscribe(observer);
verify(observer, never()).onNext(any(Integer.class));
verify(observer, never()).onError(any(Throwable.class));
verify(observer, times(1)).onComplete();
}
@Test
public void testCountAFewItems() {
Observable<String> observable = Observable.just("a", "b", "c", "d");
observable.count().subscribe(w);
// we should be called only once
verify(w, times(1)).onNext(anyLong());
verify(w).onNext(4L);
verify(w, never()).onError(any(Throwable.class));
verify(w, times(1)).onComplete();
}
@Test
public void testTakeWhileToList() {
final int expectedCount = 3;
final AtomicInteger count = new AtomicInteger();
for (int i = 0; i < expectedCount; i++) {
Observable.just(Boolean.TRUE, Boolean.FALSE)
.takeWhile(v -> v)
.toList()
.doOnNext(booleans -> count.incrementAndGet())
.subscribe();
}
assertEquals(expectedCount, count.get());
}
@Test
public void testMaterializeDematerializeChaining() {
Observable<Integer> obs = Observable.just(1);
Observable<Integer> chained = obs.materialize().dematerialize();
Subscriber<Integer> observer = TestHelper.mockSubscriber();
chained.subscribe(observer);
verify(observer, times(1)).onNext(1);
verify(observer, times(1)).onComplete();
verify(observer, times(0)).onError(any(Throwable.class));
}
@Test
@Ignore("null values are not allowed")
public void testContainsWithNull() {
Observable<Boolean> observable = Observable.just("a", "b", null).contains(null);
Subscriber<Object> observer = TestHelper.mockSubscriber();
observable.subscribe(observer);
verify(observer, times(1)).onNext(true);
verify(observer, never()).onNext(false);
verify(observer, never()).onError(org.mockito.Matchers.any(Throwable.class));
verify(observer, times(1)).onComplete();
}
@Test
public void testContains() {
Observable<Boolean> observable =
Observable.just("a", "b", "c").contains("b"); // FIXME nulls not allowed, changed to "c"
Subscriber<Boolean> observer = TestHelper.mockSubscriber();
observable.subscribe(observer);
verify(observer, times(1)).onNext(true);
verify(observer, never()).onNext(false);
verify(observer, never()).onError(org.mockito.Matchers.any(Throwable.class));
verify(observer, times(1)).onComplete();
}
@Test
public void testContainsWithInexistence() {
Observable<Boolean> observable =
Observable.just("a", "b").contains("c"); // FIXME null values are not allowed, removed
Subscriber<Object> observer = TestHelper.mockSubscriber();
observable.subscribe(observer);
verify(observer, times(1)).onNext(false);
verify(observer, never()).onNext(true);
verify(observer, never()).onError(org.mockito.Matchers.any(Throwable.class));
verify(observer, times(1)).onComplete();
}
@Test
public void testExtend() {
final TestSubscriber<Object> subscriber = new TestSubscriber<>();
final Object value = new Object();
Observable.just(value)
.to(
onSubscribe -> {
onSubscribe.subscribe(subscriber);
subscriber.assertNoErrors();
subscriber.assertComplete();
subscriber.assertValue(value);
return subscriber.values().get(0);
});
}
@Test
public void testOfType() {
Observable<String> observable = Observable.just(1, "abc", false, 2L).ofType(String.class);
Subscriber<Object> observer = TestHelper.mockSubscriber();
observable.subscribe(observer);
verify(observer, never()).onNext(1);
verify(observer, times(1)).onNext("abc");
verify(observer, never()).onNext(false);
verify(observer, never()).onNext(2L);
verify(observer, never()).onError(org.mockito.Matchers.any(Throwable.class));
verify(observer, times(1)).onComplete();
}
@Test
public void testCreate() {
Observable<String> observable = Observable.just("one", "two", "three");
Subscriber<String> observer = TestHelper.mockSubscriber();
observable.subscribe(observer);
verify(observer, times(1)).onNext("one");
verify(observer, times(1)).onNext("two");
verify(observer, times(1)).onNext("three");
verify(observer, never()).onError(any(Throwable.class));
verify(observer, times(1)).onComplete();
}
@Test
public void testAlreadyUnsubscribedClient() {
Subscriber<Integer> done = Subscribers.empty();
done.unsubscribe();
@SuppressWarnings("unchecked")
Observer<Integer> o = mock(Observer.class);
Observable<Integer> result = Observable.just(1).publish().refCount();
result.subscribe(done);
result.subscribe(o);
verify(o).onNext(1);
verify(o).onCompleted();
verify(o, never()).onError(any(Throwable.class));
}
@Test
public void testCollectToString() {
String value =
Observable.just(1, 2, 3)
.collect(
StringBuilder::new,
(sb, v) -> {
if (sb.length() > 0) {
sb.append("-");
}
sb.append(v);
})
.toBlocking()
.last()
.toString();
assertEquals("1-2-3", value);
}
@Test
public void testAwaitTerminalEventWithDurationAndUnsubscribeOnTimeout() {
TestSubscriber<Object> ts = new TestSubscriber<Object>();
final AtomicBoolean unsub = new AtomicBoolean(false);
Observable.just(1)
//
.doOnUnsubscribe(
new Action0() {
@Override
public void call() {
unsub.set(true);
}
})
//
.delay(1000, TimeUnit.MILLISECONDS)
.subscribe(ts);
ts.awaitTerminalEventAndUnsubscribeOnTimeout(100, TimeUnit.MILLISECONDS);
assertTrue(unsub.get());
}
/**
* The error from the user provided Observer is not handled by the subscribe method try/catch.
*
* <p>It is handled by the AtomicObserver that wraps the provided Observer.
*
* <p>Result: Passes (if AtomicObserver functionality exists)
*/
@Test
public void testCustomObservableWithErrorInObserverAsynchronous() throws InterruptedException {
final CountDownLatch latch = new CountDownLatch(1);
final AtomicInteger count = new AtomicInteger();
final AtomicReference<Throwable> error = new AtomicReference<>();
// FIXME custom built???
Observable.just("1", "2", "three", "4")
.subscribeOn(Schedulers.newThread())
.safeSubscribe(
new Observer<String>() {
@Override
public void onComplete() {
System.out.println("completed");
latch.countDown();
}
@Override
public void onError(Throwable e) {
error.set(e);
System.out.println("error");
e.printStackTrace();
latch.countDown();
}
@Override
public void onNext(String v) {
int num = Integer.parseInt(v);
System.out.println(num);
// doSomething(num);
count.incrementAndGet();
}
});
// wait for async sequence to complete
latch.await();
assertEquals(2, count.get());
assertNotNull(error.get());
if (!(error.get() instanceof NumberFormatException)) {
fail("It should be a NumberFormatException");
}
}
@Test
public void testCollectToList() {
Observable<List<Integer>> o =
Observable.just(1, 2, 3).collect(ArrayList::new, (list, v) -> list.add(v));
List<Integer> list = o.toBlocking().last();
assertEquals(3, list.size());
assertEquals(1, list.get(0).intValue());
assertEquals(2, list.get(1).intValue());
assertEquals(3, list.get(2).intValue());
// test multiple subscribe
List<Integer> list2 = o.toBlocking().last();
assertEquals(3, list2.size());
assertEquals(1, list2.get(0).intValue());
assertEquals(2, list2.get(1).intValue());
assertEquals(3, list2.get(2).intValue());
}
@Test
public void testStartWithWithScheduler() {
TestScheduler scheduler = new TestScheduler();
Observable<Integer> observable =
Observable.just(3, 4).startWith(Arrays.asList(1, 2)).subscribeOn(scheduler);
Subscriber<Integer> observer = TestHelper.mockSubscriber();
observable.subscribe(observer);
scheduler.advanceTimeBy(1, TimeUnit.MILLISECONDS);
InOrder inOrder = inOrder(observer);
inOrder.verify(observer, times(1)).onNext(1);
inOrder.verify(observer, times(1)).onNext(2);
inOrder.verify(observer, times(1)).onNext(3);
inOrder.verify(observer, times(1)).onNext(4);
inOrder.verify(observer, times(1)).onComplete();
inOrder.verifyNoMoreInteractions();
}
@Test
public void testOfTypeWithPolymorphism() {
ArrayList<Integer> l1 = new ArrayList<>();
l1.add(1);
LinkedList<Integer> l2 = new LinkedList<>();
l2.add(2);
@SuppressWarnings("rawtypes")
Observable<List> observable = Observable.<Object>just(l1, l2, "123").ofType(List.class);
Subscriber<Object> observer = TestHelper.mockSubscriber();
observable.subscribe(observer);
verify(observer, times(1)).onNext(l1);
verify(observer, times(1)).onNext(l2);
verify(observer, never()).onNext("123");
verify(observer, never()).onError(org.mockito.Matchers.any(Throwable.class));
verify(observer, times(1)).onComplete();
}
@Test
public void testAmbWith() {
TestSubscriber<Integer> ts = new TestSubscriber<>();
Observable.just(1).ambWith(Observable.just(2)).subscribe(ts);
ts.assertValue(1);
}
@Test
public void testConcatWith() {
TestSubscriber<Integer> ts = new TestSubscriber<>();
Observable.just(1).concatWith(Observable.just(2)).subscribe(ts);
ts.assertValues(1, 2);
}