/**
* 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 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);
}
/** 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");
}