/**
* Copyright (c) 2016-present, RxJava Contributors.
*
* 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.internal.operators.flowable;
import static org.junit.Assert.*;
import static org.mockito.ArgumentMatchers.any;
import static org.mockito.Mockito.*;
import java.util.List;
import java.util.concurrent.atomic.AtomicInteger;
import org.junit.*;
import org.reactivestreams.*;
import io.reactivex.*;
import io.reactivex.exceptions.TestException;
import io.reactivex.functions.*;
import io.reactivex.internal.fuseable.HasUpstreamPublisher;
import io.reactivex.internal.subscriptions.BooleanSubscription;
import io.reactivex.plugins.RxJavaPlugins;
import io.reactivex.schedulers.Schedulers;
import io.reactivex.subscribers.TestSubscriber;
public class FlowableReduceTest {
Subscriber<Object> observer;
SingleObserver<Object> singleObserver;
@Before
public void before() {
observer = TestHelper.mockSubscriber();
singleObserver = TestHelper.mockSingleObserver();
}
BiFunction<Integer, Integer, Integer> sum = new BiFunction<Integer, Integer, Integer>() {
@Override
public Integer apply(Integer t1, Integer t2) {
return t1 + t2;
}
};
@Test
public void testAggregateAsIntSumFlowable() {
Flowable<Integer> result = Flowable.just(1, 2, 3, 4, 5).reduce(0, sum).toFlowable()
.map(new Function<Integer, Integer>() {
@Override
public Integer apply(Integer v) {
return v;
}
});
result.subscribe(observer);
verify(observer).onNext(1 + 2 + 3 + 4 + 5);
verify(observer).onComplete();
verify(observer, never()).onError(any(Throwable.class));
}
@Test
public void testAggregateAsIntSumSourceThrowsFlowable() {
Flowable<Integer> result = Flowable.concat(Flowable.just(1, 2, 3, 4, 5),
Flowable.<Integer> error(new TestException()))
.reduce(0, sum).toFlowable().map(new Function<Integer, Integer>() {
@Override
public Integer apply(Integer v) {
return v;
}
});
result.subscribe(observer);
verify(observer, never()).onNext(any());
verify(observer, never()).onComplete();
verify(observer, times(1)).onError(any(TestException.class));
}
@Test
public void testAggregateAsIntSumAccumulatorThrowsFlowable() {
BiFunction<Integer, Integer, Integer> sumErr = new BiFunction<Integer, Integer, Integer>() {
@Override
public Integer apply(Integer t1, Integer t2) {
throw new TestException();
}
};
Flowable<Integer> result = Flowable.just(1, 2, 3, 4, 5)
.reduce(0, sumErr).toFlowable().map(new Function<Integer, Integer>() {
@Override
public Integer apply(Integer v) {
return v;
}
});
result.subscribe(observer);
verify(observer, never()).onNext(any());
verify(observer, never()).onComplete();
verify(observer, times(1)).onError(any(TestException.class));
}
@Test
public void testAggregateAsIntSumResultSelectorThrowsFlowable() {
Function<Integer, Integer> error = new Function<Integer, Integer>() {
@Override
public Integer apply(Integer t1) {
throw new TestException();
}
};
Flowable<Integer> result = Flowable.just(1, 2, 3, 4, 5)
.reduce(0, sum).toFlowable().map(error);
result.subscribe(observer);
verify(observer, never()).onNext(any());
verify(observer, never()).onComplete();
verify(observer, times(1)).onError(any(TestException.class));
}
@Test
public void testBackpressureWithInitialValueFlowable() throws InterruptedException {
Flowable<Integer> source = Flowable.just(1, 2, 3, 4, 5, 6);
Flowable<Integer> reduced = source.reduce(0, sum).toFlowable();
Integer r = reduced.blockingFirst();
assertEquals(21, r.intValue());
}
@Test
public void testAggregateAsIntSum() {
Single<Integer> result = Flowable.just(1, 2, 3, 4, 5).reduce(0, sum)
.map(new Function<Integer, Integer>() {
@Override
public Integer apply(Integer v) {
return v;
}
});
result.subscribe(singleObserver);
verify(singleObserver).onSuccess(1 + 2 + 3 + 4 + 5);
verify(singleObserver, never()).onError(any(Throwable.class));
}
@Test
public void testAggregateAsIntSumSourceThrows() {
Single<Integer> result = Flowable.concat(Flowable.just(1, 2, 3, 4, 5),
Flowable.<Integer> error(new TestException()))
.reduce(0, sum).map(new Function<Integer, Integer>() {
@Override
public Integer apply(Integer v) {
return v;
}
});
result.subscribe(singleObserver);
verify(singleObserver, never()).onSuccess(any());
verify(singleObserver, times(1)).onError(any(TestException.class));
}
@Test
public void testAggregateAsIntSumAccumulatorThrows() {
BiFunction<Integer, Integer, Integer> sumErr = new BiFunction<Integer, Integer, Integer>() {
@Override
public Integer apply(Integer t1, Integer t2) {
throw new TestException();
}
};
Single<Integer> result = Flowable.just(1, 2, 3, 4, 5)
.reduce(0, sumErr).map(new Function<Integer, Integer>() {
@Override
public Integer apply(Integer v) {
return v;
}
});
result.subscribe(singleObserver);
verify(singleObserver, never()).onSuccess(any());
verify(singleObserver, times(1)).onError(any(TestException.class));
}
@Test
public void testAggregateAsIntSumResultSelectorThrows() {
Function<Integer, Integer> error = new Function<Integer, Integer>() {
@Override
public Integer apply(Integer t1) {
throw new TestException();
}
};
Single<Integer> result = Flowable.just(1, 2, 3, 4, 5)
.reduce(0, sum).map(error);
result.subscribe(singleObserver);
verify(singleObserver, never()).onSuccess(any());
verify(singleObserver, times(1)).onError(any(TestException.class));
}
@Test
public void testBackpressureWithNoInitialValue() throws InterruptedException {
Flowable<Integer> source = Flowable.just(1, 2, 3, 4, 5, 6);
Maybe<Integer> reduced = source.reduce(sum);
Integer r = reduced.blockingGet();
assertEquals(21, r.intValue());
}
@Test
public void testBackpressureWithInitialValue() throws InterruptedException {
Flowable<Integer> source = Flowable.just(1, 2, 3, 4, 5, 6);
Single<Integer> reduced = source.reduce(0, sum);
Integer r = reduced.blockingGet();
assertEquals(21, r.intValue());
}
@Test
public void reducerCrashSuppressOnError() {
List<Throwable> errors = TestHelper.trackPluginErrors();
try {
Flowable.<Integer>fromPublisher(new Publisher<Integer>() {
@Override
public void subscribe(Subscriber<? super Integer> s) {
s.onSubscribe(new BooleanSubscription());
s.onNext(1);
s.onNext(1);
s.onError(new TestException("Source"));
s.onComplete();
}
})
.reduce(new BiFunction<Integer, Integer, Integer>() {
@Override
public Integer apply(Integer a, Integer b) throws Exception {
throw new TestException("Reducer");
}
})
.toFlowable()
.test()
.assertFailureAndMessage(TestException.class, "Reducer");
TestHelper.assertUndeliverable(errors, 0, TestException.class, "Source");
} finally {
RxJavaPlugins.reset();
}
}
@Test
public void cancel() {
TestSubscriber<Integer> ts = Flowable.just(1)
.concatWith(Flowable.<Integer>never())
.reduce(new BiFunction<Integer, Integer, Integer>() {
@Override
public Integer apply(Integer a, Integer b) throws Exception {
return a + b;
}
}).toFlowable()
.test();
ts.assertEmpty();
ts.cancel();
ts.assertEmpty();
}
@Test
public void testBackpressureWithNoInitialValueObservable() throws InterruptedException {
Flowable<Integer> source = Flowable.just(1, 2, 3, 4, 5, 6);
Flowable<Integer> reduced = source.reduce(sum).toFlowable();
Integer r = reduced.blockingFirst();
assertEquals(21, r.intValue());
}
@Test
public void source() {
Flowable<Integer> source = Flowable.just(1);
assertSame(source, (((HasUpstreamPublisher<?>)source.reduce(sum))).source());
}
@Test
public void dispose() {
TestHelper.checkDisposed(Flowable.range(1, 2).reduce(sum));
}
@Test
public void doubleOnSubscribe() {
TestHelper.checkDoubleOnSubscribeFlowableToMaybe(new Function<Flowable<Integer>, MaybeSource<Integer>>() {
@Override
public MaybeSource<Integer> apply(Flowable<Integer> f) throws Exception {
return f.reduce(sum);
}
});
}
@Test
public void error() {
Flowable.<Integer>error(new TestException())
.reduce(sum)
.test()
.assertFailure(TestException.class);
}
@Test
public void errorFlowable() {
Flowable.<Integer>error(new TestException())
.reduce(sum)
.toFlowable()
.test()
.assertFailure(TestException.class);
}
@Test
public void empty() {
Flowable.<Integer>empty()
.reduce(sum)
.test()
.assertResult();
}
@Test
public void emptyFlowable() {
Flowable.<Integer>empty()
.reduce(sum)
.toFlowable()
.test()
.assertResult();
}
@Test
public void badSource() {
TestHelper.checkBadSourceFlowable(new Function<Flowable<Integer>, Object>() {
@Override
public Object apply(Flowable<Integer> f) throws Exception {
return f.reduce(sum);
}
}, false, 1, 1, 1);
}
@Test
public void badSourceFlowable() {
TestHelper.checkBadSourceFlowable(new Function<Flowable<Integer>, Object>() {
@Override
public Object apply(Flowable<Integer> f) throws Exception {
return f.reduce(sum).toFlowable();
}
}, false, 1, 1, 1);
}
@Test
public void reducerThrows() {
Flowable.just(1, 2)
.reduce(new BiFunction<Integer, Integer, Integer>() {
@Override
public Integer apply(Integer a, Integer b) throws Exception {
throw new TestException();
}
})
.test()
.assertFailure(TestException.class);
}
/**
* https://gist.github.com/jurna/353a2bd8ff83f0b24f0b5bc772077d61
*/
@Test
public void shouldReduceTo10Events() {
final AtomicInteger count = new AtomicInteger();
Flowable.range(0, 10).flatMap(new Function<Integer, Publisher<String>>() {
@Override
public Publisher<String> apply(final Integer x) throws Exception {
return Flowable.range(0, 2)
.map(new Function<Integer, String>() {
@Override
public String apply(Integer y) throws Exception {
return blockingOp(x, y);
}
}).subscribeOn(Schedulers.io())
.reduce(new BiFunction<String, String, String>() {
@Override
public String apply(String l, String r) throws Exception {
return l + "_" + r;
}
})
.doOnSuccess(new Consumer<String>() {
@Override
public void accept(String s) throws Exception {
count.incrementAndGet();
System.out.println("Completed with " + s);}
})
.toFlowable();
}
}
).blockingLast();
assertEquals(10, count.get());
}
/**
* https://gist.github.com/jurna/353a2bd8ff83f0b24f0b5bc772077d61
*/
@Test
public void shouldReduceTo10EventsFlowable() {
final AtomicInteger count = new AtomicInteger();
Flowable.range(0, 10).flatMap(new Function<Integer, Publisher<String>>() {
@Override
public Publisher<String> apply(final Integer x) throws Exception {
return Flowable.range(0, 2)
.map(new Function<Integer, String>() {
@Override
public String apply(Integer y) throws Exception {
return blockingOp(x, y);
}
}).subscribeOn(Schedulers.io())
.reduce(new BiFunction<String, String, String>() {
@Override
public String apply(String l, String r) throws Exception {
return l + "_" + r;
}
})
.toFlowable()
.doOnNext(new Consumer<String>() {
@Override
public void accept(String s) throws Exception {
count.incrementAndGet();
System.out.println("Completed with " + s);}
})
;
}
}
).blockingLast();
assertEquals(10, count.get());
}
static String blockingOp(Integer x, Integer y) {
try {
Thread.sleep(100);
} catch (InterruptedException e) {
e.printStackTrace();
}
return "x" + x + "y" + y;
}
}