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CombineLatestTests.java
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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 org.junit.Test;
import rx.CovarianceTest.CoolRating;
import rx.CovarianceTest.ExtendedResult;
import rx.CovarianceTest.HorrorMovie;
import rx.CovarianceTest.Media;
import rx.CovarianceTest.Movie;
import rx.CovarianceTest.Rating;
import rx.CovarianceTest.Result;
import rx.functions.Action1;
import rx.functions.Func2;
import rx.subjects.BehaviorSubject;
import static org.junit.Assert.assertNull;
import static rx.Observable.combineLatest;
public class CombineLatestTests {
/**
* This won't compile if super/extends isn't done correctly on generics
*/
@Test
public void testCovarianceOfCombineLatest() {
Observable<HorrorMovie> horrors = Observable.just(new HorrorMovie());
Observable<CoolRating> ratings = Observable.just(new CoolRating());
Observable.<Movie, CoolRating, Result> combineLatest(horrors, ratings, combine).toBlocking().forEach(action);
Observable.<Movie, CoolRating, Result> combineLatest(horrors, ratings, combine).toBlocking().forEach(action);
Observable.<Media, Rating, ExtendedResult> combineLatest(horrors, ratings, combine).toBlocking().forEach(extendedAction);
Observable.<Media, Rating, Result> combineLatest(horrors, ratings, combine).toBlocking().forEach(action);
Observable.<Media, Rating, ExtendedResult> combineLatest(horrors, ratings, combine).toBlocking().forEach(action);
Observable.<Movie, CoolRating, Result> combineLatest(horrors, ratings, combine);
}
Func2<Media, Rating, ExtendedResult> combine = new Func2<Media, Rating, ExtendedResult>() {
@Override
public ExtendedResult call(Media m, Rating r) {
return new ExtendedResult();
}
};
Action1<Result> action = new Action1<Result>() {
@Override
public void call(Result t1) {
System.out.println("Result: " + t1);
}
};
Action1<ExtendedResult> extendedAction = new Action1<ExtendedResult>() {
@Override
public void call(ExtendedResult t1) {
System.out.println("Result: " + t1);
}
};
@Test
public void testNullEmitting() throws Exception {
Observable<Boolean> nullObservable = BehaviorSubject.create((Boolean) null);
Observable<Boolean> nonNullObservable = BehaviorSubject.create(true);
Observable<Boolean> combined =
combineLatest(nullObservable, nonNullObservable, new Func2<Boolean, Boolean, Boolean>() {
@Override
public Boolean call(Boolean bool1, Boolean bool2) {
return bool1 == null ? null : bool2;
}
});
combined.subscribe(new Action1<Boolean>() {
@Override
public void call(Boolean aBoolean) {
assertNull(aBoolean);
}
});
}
}