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ReduceTests.java
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75 lines (59 loc) · 2.3 KB
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/**
* Copyright 2015 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 io.reactivex;
import static org.junit.Assert.assertEquals;
import org.junit.Test;
import io.reactivex.CovarianceTest.*;
public class ReduceTests {
@Test
public void reduceInts() {
Observable<Integer> o = Observable.just(1, 2, 3);
int value = o.reduce((t1, t2) -> t1 + t2).toBlocking().single();
assertEquals(6, value);
}
@SuppressWarnings("unused")
@Test
public void reduceWithObjects() {
Observable<Movie> horrorMovies = Observable.<Movie> just(new HorrorMovie());
Observable<Movie> reduceResult = horrorMovies.scan((t1, t2) -> t2).takeLast(1);
Observable<Movie> reduceResult2 = horrorMovies.reduce((t1, t2) -> t2);
}
/**
* Reduce consumes and produces T so can't do covariance.
*
* https://github.com/ReactiveX/RxJava/issues/360#issuecomment-24203016
*/
@SuppressWarnings("unused")
@Test
public void reduceWithCovariantObjects() {
Observable<Movie> horrorMovies = Observable.<Movie> just(new HorrorMovie());
Observable<Movie> reduceResult2 = horrorMovies.reduce((t1, t2) -> t2);
}
/**
* Reduce consumes and produces T so can't do covariance.
*
* https://github.com/ReactiveX/RxJava/issues/360#issuecomment-24203016
*/
@Test
public void reduceCovariance() {
// must type it to <Movie>
Observable<Movie> horrorMovies = Observable.<Movie> just(new HorrorMovie());
libraryFunctionActingOnMovieObservables(horrorMovies);
}
/*
* This accepts <Movie> instead of <? super Movie> since `reduce` can't handle covariants
*/
public void libraryFunctionActingOnMovieObservables(Observable<Movie> obs) {
obs.reduce((t1, t2) -> t2);
}
}