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/**
* Copyright 2014 Netflix, Inc.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package rx;
import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertTrue;
import java.util.List;
import org.junit.Test;
import rx.CovarianceTest.HorrorMovie;
import rx.CovarianceTest.Media;
import rx.CovarianceTest.Movie;
import rx.Observable.OnSubscribe;
public class MergeTests {
/**
* This won't compile if super/extends isn't done correctly on generics
*/
@Test
public void testCovarianceOfMerge() {
Observable<HorrorMovie> horrors = Observable.from(new HorrorMovie());
Observable<Observable<HorrorMovie>> metaHorrors = Observable.just(horrors);
Observable.<Media> merge(metaHorrors);
}
@Test
public void testMergeCovariance() {
Observable<Media> o1 = Observable.<Media> from(new HorrorMovie(), new Movie());
Observable<Media> o2 = Observable.from(new Media(), new HorrorMovie());
Observable<Observable<Media>> os = Observable.from(o1, o2);
List<Media> values = Observable.merge(os).toList().toBlocking().single();
assertEquals(4, values.size());
}
@Test
public void testMergeCovariance2() {
Observable<Media> o1 = Observable.from(new HorrorMovie(), new Movie(), new Media());
Observable<Media> o2 = Observable.from(new Media(), new HorrorMovie());
Observable<Observable<Media>> os = Observable.from(o1, o2);
List<Media> values = Observable.merge(os).toList().toBlocking().single();
assertEquals(5, values.size());
}
@Test
public void testMergeCovariance3() {
Observable<Movie> o1 = Observable.from(new HorrorMovie(), new Movie());
Observable<Media> o2 = Observable.from(new Media(), new HorrorMovie());
List<Media> values = Observable.merge(o1, o2).toList().toBlocking().single();
assertTrue(values.get(0) instanceof HorrorMovie);
assertTrue(values.get(1) instanceof Movie);
assertTrue(values.get(2) instanceof Media);
assertTrue(values.get(3) instanceof HorrorMovie);
}
@Test
public void testMergeCovariance4() {
Observable<Movie> o1 = Observable.create(new OnSubscribe<Movie>() {
@Override
public void call(Subscriber<? super Movie> o) {
o.onNext(new HorrorMovie());
o.onNext(new Movie());
// o.onNext(new Media()); // correctly doesn't compile
o.onCompleted();
}
});
Observable<Media> o2 = Observable.from(new Media(), new HorrorMovie());
List<Media> values = Observable.merge(o1, o2).toList().toBlocking().single();
assertTrue(values.get(0) instanceof HorrorMovie);
assertTrue(values.get(1) instanceof Movie);
assertTrue(values.get(2) instanceof Media);
assertTrue(values.get(3) instanceof HorrorMovie);
}
}