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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);

}

}