/**
* Occasionally zip may be invoked with 0 observables. Test that we don't block indefinitely
* instead of immediately invoking zip with 0 argument.
*
* <p>We now expect an NoSuchElementException since last() requires at least one value and nothing
* will be emitted.
*/
@Test(expected = NoSuchElementException.class)
public void nonBlockingObservable() {
final Object invoked = new Object();
Collection<Observable<Object>> observables = Collections.emptyList();
Observable<Object> result =
Observable.zip(
observables,
args -> {
System.out.println("received: " + args);
assertEquals("No argument should have been passed", 0, args.length);
return invoked;
});
assertSame(invoked, result.toBlocking().last());
}
/** This won't compile if super/extends isn't done correctly on generics */
@Test
public void testCovarianceOfZip() {
Observable<HorrorMovie> horrors = Observable.just(new HorrorMovie());
Observable<CoolRating> ratings = Observable.just(new CoolRating());
Observable.<Movie, CoolRating, Result>zip(horrors, ratings, combine)
.toBlocking()
.forEach(action);
Observable.<Movie, CoolRating, Result>zip(horrors, ratings, combine)
.toBlocking()
.forEach(action);
Observable.<Media, Rating, ExtendedResult>zip(horrors, ratings, combine)
.toBlocking()
.forEach(extendedAction);
Observable.<Media, Rating, Result>zip(horrors, ratings, combine).toBlocking().forEach(action);
Observable.<Media, Rating, ExtendedResult>zip(horrors, ratings, combine)
.toBlocking()
.forEach(action);
Observable.<Movie, CoolRating, Result>zip(horrors, ratings, combine);
}