@Test
public void testZipAsync() {
int NUM = (int) (Observable.bufferSize() * 2.1);
AtomicInteger c1 = new AtomicInteger();
AtomicInteger c2 = new AtomicInteger();
TestSubscriber<Integer> ts = new TestSubscriber<>();
Observable<Integer> zipped =
Observable.zip(
incrementingIntegers(c1).subscribeOn(Schedulers.computation()),
incrementingIntegers(c2).subscribeOn(Schedulers.computation()),
(t1, t2) -> t1 + t2);
zipped.take(NUM).subscribe(ts);
ts.awaitTerminalEvent();
ts.assertNoErrors();
System.out.println(
"testZipAsync => Received: "
+ ts.valueCount()
+ " Emitted: "
+ c1.get()
+ " / "
+ c2.get());
assertEquals(NUM, ts.valueCount());
int max = Observable.bufferSize() * 5;
assertTrue("" + c1.get() + " >= " + max, c1.get() < max);
assertTrue("" + c2.get() + " >= " + max, c2.get() < max);
}
@Test
public void testTakeFilterSkipChainAsync() {
int NUM = (int) (Observable.bufferSize() * 2.1);
AtomicInteger c = new AtomicInteger();
TestSubscriber<Integer> ts = new TestSubscriber<>();
incrementingIntegers(c)
.observeOn(Schedulers.computation())
.skip(10000)
.filter(i -> i > 11000)
.take(NUM)
.subscribe(ts);
ts.awaitTerminalEvent();
ts.assertNoErrors();
// emit 10000 that are skipped
// emit next 1000 that are filtered out
// take NUM
// so emitted is at least 10000+1000+NUM + extra for buffer size/threshold
int expected = 10000 + 1000 + Observable.bufferSize() * 3 + Observable.bufferSize() / 2;
System.out.println(
"testTakeFilterSkipChain => Received: "
+ ts.valueCount()
+ " Emitted: "
+ c.get()
+ " Expected: "
+ expected);
assertEquals(NUM, ts.valueCount());
assertTrue(c.get() < expected);
}
@Test
@Ignore // the test is non-deterministic and can't be made deterministic
public void testFlatMapAsync() {
int NUM = (int) (Observable.bufferSize() * 2.1);
AtomicInteger c = new AtomicInteger();
TestSubscriber<Integer> ts = new TestSubscriber<>();
incrementingIntegers(c)
.subscribeOn(Schedulers.computation())
.flatMap(
i ->
incrementingIntegers(new AtomicInteger())
.take(10)
.subscribeOn(Schedulers.computation()))
.take(NUM)
.subscribe(ts);
ts.awaitTerminalEvent();
ts.assertNoErrors();
System.out.println(
"testFlatMapAsync => Received: "
+ ts.valueCount()
+ " Emitted: "
+ c.get()
+ " Size: "
+ Observable.bufferSize());
assertEquals(NUM, ts.valueCount());
// even though we only need 10, it will request at least Observable.bufferSize(), and then as it
// drains keep requesting more
// and then it will be non-deterministic when the take() causes the unsubscribe as it is
// scheduled on 10 different schedulers (threads)
// normally this number is ~250 but can get up to ~1200 when Observable.bufferSize() == 1024
assertTrue(c.get() <= Observable.bufferSize() * 2);
}
/**
* A reduce on an empty Observable and a seed should just pass the seed through.
*
* <p>This is confirmed at https://github.com/ReactiveX/RxJava/issues/423#issuecomment-27642456
*/
@Test
public void testReduceWithEmptyObservableAndSeed() {
Observable<Integer> observable = Observable.range(1, 0);
int value = observable.reduce(1, (t1, t2) -> t1 + t2).toBlocking().last();
assertEquals(1, value);
}
@Test
public void testMergeAsync() {
int NUM = (int) (Observable.bufferSize() * 4.1);
AtomicInteger c1 = new AtomicInteger();
AtomicInteger c2 = new AtomicInteger();
TestSubscriber<Integer> ts = new TestSubscriber<>();
Observable<Integer> merged =
Observable.merge(
incrementingIntegers(c1).subscribeOn(Schedulers.computation()),
incrementingIntegers(c2).subscribeOn(Schedulers.computation()));
merged.take(NUM).subscribe(ts);
ts.awaitTerminalEvent();
ts.assertNoErrors();
System.out.println(
"testMergeAsync => Received: "
+ ts.valueCount()
+ " Emitted: "
+ c1.get()
+ " / "
+ c2.get());
assertEquals(NUM, ts.valueCount());
// either one can starve the other, but neither should be capable of doing more than 5 batches
// (taking 4.1)
// TODO is it possible to make this deterministic rather than one possibly starving the other?
// benjchristensen => In general I'd say it's not worth trying to make it so, as "fair"
// algoritms generally take a performance hit
int max = Observable.bufferSize() * 7;
assertTrue("" + c1.get() + " >= " + max, c1.get() < max);
assertTrue("" + c2.get() + " >= " + max, c2.get() < max);
}
/**
* 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 fromArray() {
String[] items = new String[] {"one", "two", "three"};
assertEquals((Long) 3L, Observable.fromArray(items).count().toBlocking().single());
assertEquals("two", Observable.fromArray(items).skip(1).take(1).toBlocking().single());
assertEquals("three", Observable.fromArray(items).takeLast(1).toBlocking().single());
}
@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 testObserveOnWithSlowConsumer() {
int NUM = (int) (Observable.bufferSize() * 0.2);
AtomicInteger c = new AtomicInteger();
TestSubscriber<Integer> ts = new TestSubscriber<>();
incrementingIntegers(c)
.observeOn(Schedulers.computation())
.map(
i -> {
try {
Thread.sleep(1);
} catch (InterruptedException e) {
e.printStackTrace();
}
return i;
})
.take(NUM)
.subscribe(ts);
ts.awaitTerminalEvent();
ts.assertNoErrors();
System.out.println(
"testObserveOnWithSlowConsumer => Received: " + ts.valueCount() + " Emitted: " + c.get());
assertEquals(NUM, ts.valueCount());
assertTrue(c.get() < Observable.bufferSize() * 2);
}
@Test
public void testMergeAsyncThenObserveOnLoop() {
for (int i = 0; i < 500; i++) {
if (i % 10 == 0) {
System.out.println("testMergeAsyncThenObserveOnLoop >> " + i);
}
// Verify there is no MissingBackpressureException
int NUM = (int) (Observable.bufferSize() * 4.1);
AtomicInteger c1 = new AtomicInteger();
AtomicInteger c2 = new AtomicInteger();
TestSubscriber<Integer> ts = new TestSubscriber<>();
Observable<Integer> merged =
Observable.merge(
incrementingIntegers(c1).subscribeOn(Schedulers.computation()),
incrementingIntegers(c2).subscribeOn(Schedulers.computation()));
merged.observeOn(Schedulers.io()).take(NUM).subscribe(ts);
ts.awaitTerminalEvent(5, TimeUnit.SECONDS);
ts.assertComplete();
ts.assertNoErrors();
System.out.println(
"testMergeAsyncThenObserveOn => Received: "
+ ts.valueCount()
+ " Emitted: "
+ c1.get()
+ " / "
+ c2.get());
assertEquals(NUM, ts.valueCount());
}
}
@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 testFirstOfNone() {
Observable<Integer> observable = Observable.empty();
observable.first().subscribe(w);
verify(w, never()).onNext(anyInt());
verify(w, never()).onComplete();
verify(w, times(1)).onError(isA(NoSuchElementException.class));
}
@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));
}
@Test
public void testTakeFirstOfNone() {
Observable<Integer> observable = Observable.empty();
observable.take(1).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 testCountError() {
Observable<String> o = Observable.error(() -> new RuntimeException());
o.count().subscribe(w);
verify(w, never()).onNext(anyInt());
verify(w, never()).onComplete();
verify(w, times(1)).onError(any(RuntimeException.class));
}
@Test
public void testCountZeroItems() {
Observable<String> observable = Observable.empty();
observable.count().subscribe(w);
// we should be called only once
verify(w, times(1)).onNext(anyLong());
verify(w).onNext(0L);
verify(w, never()).onError(any(Throwable.class));
verify(w, times(1)).onComplete();
}
@Test
public void fromIterable() {
ArrayList<String> items = new ArrayList<>();
items.add("one");
items.add("two");
items.add("three");
assertEquals((Long) 3L, Observable.fromIterable(items).count().toBlocking().single());
assertEquals("two", Observable.fromIterable(items).skip(1).take(1).toBlocking().single());
assertEquals("three", Observable.fromIterable(items).takeLast(1).toBlocking().single());
}
@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 testObserveOn() {
int NUM = (int) (Observable.bufferSize() * 2.1);
AtomicInteger c = new AtomicInteger();
TestSubscriber<Integer> ts = new TestSubscriber<>();
incrementingIntegers(c).observeOn(Schedulers.computation()).take(NUM).subscribe(ts);
ts.awaitTerminalEvent();
ts.assertNoErrors();
System.out.println("testObserveOn => Received: " + ts.valueCount() + " Emitted: " + c.get());
assertEquals(NUM, ts.valueCount());
assertTrue(c.get() < Observable.bufferSize() * 4);
}
@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 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));
}
/** A reduce should fail with an NoSuchElementException if done on an empty Observable. */
@Test(expected = NoSuchElementException.class)
public void testReduceWithEmptyObservable() {
Observable<Integer> observable = Observable.range(1, 0);
observable
.reduce((t1, t2) -> t1 + t2)
.toBlocking()
.forEach(
t1 -> {
// do nothing ... we expect an exception instead
});
fail("Expected an exception to be thrown");
}
@Test
public void testContainsWithEmptyObservable() {
Observable<Boolean> observable = Observable.<String>empty().contains("a");
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
@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 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 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 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 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();
}