/**
* 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.observable;
import static org.junit.Assert.*;
import static org.mockito.ArgumentMatchers.*;
import static org.mockito.Mockito.*;
import java.util.*;
import java.util.concurrent.Callable;
import java.util.concurrent.CopyOnWriteArrayList;
import java.util.concurrent.atomic.AtomicInteger;
import org.junit.Test;
import io.reactivex.*;
import io.reactivex.Observable;
import io.reactivex.Observer;
import io.reactivex.disposables.Disposable;
import io.reactivex.disposables.Disposables;
import io.reactivex.exceptions.TestException;
import io.reactivex.functions.*;
import io.reactivex.observers.*;
import io.reactivex.plugins.RxJavaPlugins;
import io.reactivex.subjects.PublishSubject;
public class ObservableScanTest {
@Test
public void testScanIntegersWithInitialValue() {
Observer<String> observer = TestHelper.mockObserver();
Observable<Integer> o = Observable.just(1, 2, 3);
Observable<String> m = o.scan("", new BiFunction<String, Integer, String>() {
@Override
public String apply(String s, Integer n) {
return s + n.toString();
}
});
m.subscribe(observer);
verify(observer, never()).onError(any(Throwable.class));
verify(observer, times(1)).onNext("");
verify(observer, times(1)).onNext("1");
verify(observer, times(1)).onNext("12");
verify(observer, times(1)).onNext("123");
verify(observer, times(4)).onNext(anyString());
verify(observer, times(1)).onComplete();
verify(observer, never()).onError(any(Throwable.class));
}
@Test
public void testScanIntegersWithoutInitialValue() {
Observer<Integer> observer = TestHelper.mockObserver();
Observable<Integer> o = Observable.just(1, 2, 3);
Observable<Integer> m = o.scan(new BiFunction<Integer, Integer, Integer>() {
@Override
public Integer apply(Integer t1, Integer t2) {
return t1 + t2;
}
});
m.subscribe(observer);
verify(observer, never()).onError(any(Throwable.class));
verify(observer, never()).onNext(0);
verify(observer, times(1)).onNext(1);
verify(observer, times(1)).onNext(3);
verify(observer, times(1)).onNext(6);
verify(observer, times(3)).onNext(anyInt());
verify(observer, times(1)).onComplete();
verify(observer, never()).onError(any(Throwable.class));
}
@Test
public void testScanIntegersWithoutInitialValueAndOnlyOneValue() {
Observer<Integer> observer = TestHelper.mockObserver();
Observable<Integer> o = Observable.just(1);
Observable<Integer> m = o.scan(new BiFunction<Integer, Integer, Integer>() {
@Override
public Integer apply(Integer t1, Integer t2) {
return t1 + t2;
}
});
m.subscribe(observer);
verify(observer, never()).onError(any(Throwable.class));
verify(observer, never()).onNext(0);
verify(observer, times(1)).onNext(1);
verify(observer, times(1)).onNext(anyInt());
verify(observer, times(1)).onComplete();
verify(observer, never()).onError(any(Throwable.class));
}
@Test
public void shouldNotEmitUntilAfterSubscription() {
TestObserver<Integer> ts = new TestObserver<Integer>();
Observable.range(1, 100).scan(0, new BiFunction<Integer, Integer, Integer>() {
@Override
public Integer apply(Integer t1, Integer t2) {
return t1 + t2;
}
}).filter(new Predicate<Integer>() {
@Override
public boolean test(Integer t1) {
// this will cause request(1) when 0 is emitted
return t1 > 0;
}
}).subscribe(ts);
assertEquals(100, ts.values().size());
}
@Test
public void testNoBackpressureWithInitialValue() {
final AtomicInteger count = new AtomicInteger();
Observable.range(1, 100)
.scan(0, new BiFunction<Integer, Integer, Integer>() {
@Override
public Integer apply(Integer t1, Integer t2) {
return t1 + t2;
}
})
.subscribe(new DefaultObserver<Integer>() {
@Override
public void onComplete() {
}
@Override
public void onError(Throwable e) {
fail(e.getMessage());
e.printStackTrace();
}
@Override
public void onNext(Integer t) {
count.incrementAndGet();
}
});
// we only expect to receive 101 as we'll receive all 100 + the initial value
assertEquals(101, count.get());
}
/**
* This uses the public API collect which uses scan under the covers.
*/
@Test
public void testSeedFactory() {
Observable<List<Integer>> o = Observable.range(1, 10)
.collect(new Callable<List<Integer>>() {
@Override
public List<Integer> call() {
return new ArrayList<Integer>();
}
}, new BiConsumer<List<Integer>, Integer>() {
@Override
public void accept(List<Integer> list, Integer t2) {
list.add(t2);
}
}).toObservable().takeLast(1);
assertEquals(Arrays.asList(1, 2, 3, 4, 5, 6, 7, 8, 9, 10), o.blockingSingle());
assertEquals(Arrays.asList(1, 2, 3, 4, 5, 6, 7, 8, 9, 10), o.blockingSingle());
}
@Test
public void testScanWithRequestOne() {
Observable<Integer> o = Observable.just(1, 2).scan(0, new BiFunction<Integer, Integer, Integer>() {
@Override
public Integer apply(Integer t1, Integer t2) {
return t1 + t2;
}
}).take(1);
TestObserver<Integer> observer = new TestObserver<Integer>();
o.subscribe(observer);
observer.assertValue(0);
observer.assertTerminated();
observer.assertNoErrors();
}
@Test
public void testInitialValueEmittedNoProducer() {
PublishSubject<Integer> source = PublishSubject.create();
TestObserver<Integer> ts = new TestObserver<Integer>();
source.scan(0, new BiFunction<Integer, Integer, Integer>() {
@Override
public Integer apply(Integer t1, Integer t2) {
return t1 + t2;
}
}).subscribe(ts);
ts.assertNoErrors();
ts.assertNotComplete();
ts.assertValue(0);
}
@Test
public void dispose() {
TestHelper.checkDisposed(PublishSubject.create().scan(new BiFunction<Object, Object, Object>() {
@Override
public Object apply(Object a, Object b) throws Exception {
return a;
}
}));
TestHelper.checkDisposed(PublishSubject.<Integer>create().scan(0, new BiFunction<Integer, Integer, Integer>() {
@Override
public Integer apply(Integer a, Integer b) throws Exception {
return a + b;
}
}));
}
@Test
public void doubleOnSubscribe() {
TestHelper.checkDoubleOnSubscribeObservable(new Function<Observable<Object>, ObservableSource<Object>>() {
@Override
public ObservableSource<Object> apply(Observable<Object> o) throws Exception {
return o.scan(new BiFunction<Object, Object, Object>() {
@Override
public Object apply(Object a, Object b) throws Exception {
return a;
}
});
}
});
TestHelper.checkDoubleOnSubscribeObservable(new Function<Observable<Object>, ObservableSource<Object>>() {
@Override
public ObservableSource<Object> apply(Observable<Object> o) throws Exception {
return o.scan(0, new BiFunction<Object, Object, Object>() {
@Override
public Object apply(Object a, Object b) throws Exception {
return a;
}
});
}
});
}
@Test
public void error() {
Observable.error(new TestException())
.scan(new BiFunction<Object, Object, Object>() {
@Override
public Object apply(Object a, Object b) throws Exception {
return a;
}
})
.test()
.assertFailure(TestException.class);
}
@Test
public void badSource() {
TestHelper.checkBadSourceObservable(new Function<Observable<Object>, Object>() {
@Override
public Object apply(Observable<Object> o) throws Exception {
return o.scan(0, new BiFunction<Object, Object, Object>() {
@Override
public Object apply(Object a, Object b) throws Exception {
return a;
}
});
}
}, false, 1, 1, 0, 0);
}
@Test
public void testScanFunctionThrowsAndUpstreamErrorsDoesNotResultInTwoTerminalEvents() {
final RuntimeException err = new RuntimeException();
final RuntimeException err2 = new RuntimeException();
final List<Throwable> list = new CopyOnWriteArrayList<Throwable>();
final Consumer<Throwable> errorConsumer = new Consumer<Throwable>() {
@Override
public void accept(Throwable t) throws Exception {
list.add(t);
}};
try {
RxJavaPlugins.setErrorHandler(errorConsumer);
Observable.unsafeCreate(new ObservableSource<Integer>() {
@Override
public void subscribe(Observer<? super Integer> o) {
Disposable d = Disposables.empty();
o.onSubscribe(d);
o.onNext(1);
o.onNext(2);
o.onError(err2);
}})
.scan(new BiFunction<Integer,Integer,Integer>() {
@Override
public Integer apply(Integer t1, Integer t2) throws Exception {
throw err;
}})
.test()
.assertError(err)
.assertValue(1);
} finally {
RxJavaPlugins.reset();
}
}
@Test
public void testScanFunctionThrowsAndUpstreamCompletesDoesNotResultInTwoTerminalEvents() {
final RuntimeException err = new RuntimeException();
Observable.unsafeCreate(new ObservableSource<Integer>() {
@Override
public void subscribe(Observer<? super Integer> o) {
Disposable d = Disposables.empty();
o.onSubscribe(d);
o.onNext(1);
o.onNext(2);
o.onComplete();
}})
.scan(new BiFunction<Integer,Integer,Integer>() {
@Override
public Integer apply(Integer t1, Integer t2) throws Exception {
throw err;
}})
.test()
.assertError(err)
.assertValue(1);
}
@Test
public void testScanFunctionThrowsAndUpstreamEmitsOnNextResultsInScanFunctionBeingCalledOnlyOnce() {
final RuntimeException err = new RuntimeException();
final AtomicInteger count = new AtomicInteger();
Observable.unsafeCreate(new ObservableSource<Integer>() {
@Override
public void subscribe(Observer<? super Integer> o) {
Disposable d = Disposables.empty();
o.onSubscribe(d);
o.onNext(1);
o.onNext(2);
o.onNext(3);
}})
.scan(new BiFunction<Integer,Integer,Integer>() {
@Override
public Integer apply(Integer t1, Integer t2) throws Exception {
count.incrementAndGet();
throw err;
}})
.test()
.assertError(err)
.assertValue(1);
assertEquals(1, count.get());
}
}