/**
* 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.mockito.ArgumentMatchers.*;
import static org.mockito.Mockito.*;
import java.io.IOException;
import java.util.List;
import java.util.concurrent.atomic.AtomicBoolean;
import org.junit.*;
import org.mockito.InOrder;
import org.reactivestreams.Subscriber;
import io.reactivex.*;
import io.reactivex.exceptions.TestException;
import io.reactivex.functions.*;
import io.reactivex.internal.functions.Functions;
import io.reactivex.internal.fuseable.*;
import io.reactivex.internal.subscriptions.BooleanSubscription;
import io.reactivex.plugins.RxJavaPlugins;
import io.reactivex.processors.*;
import io.reactivex.subscribers.*;
public class FlowableDistinctUntilChangedTest {
Subscriber<String> w;
Subscriber<String> w2;
// nulls lead to exceptions
final Function<String, String> TO_UPPER_WITH_EXCEPTION = new Function<String, String>() {
@Override
public String apply(String s) {
if (s.equals("x")) {
return "xx";
}
return s.toUpperCase();
}
};
@Before
public void before() {
w = TestHelper.mockSubscriber();
w2 = TestHelper.mockSubscriber();
}
@Test
public void testDistinctUntilChangedOfNone() {
Flowable<String> src = Flowable.empty();
src.distinctUntilChanged().subscribe(w);
verify(w, never()).onNext(anyString());
verify(w, never()).onError(any(Throwable.class));
verify(w, times(1)).onComplete();
}
@Test
public void testDistinctUntilChangedOfNoneWithKeySelector() {
Flowable<String> src = Flowable.empty();
src.distinctUntilChanged(TO_UPPER_WITH_EXCEPTION).subscribe(w);
verify(w, never()).onNext(anyString());
verify(w, never()).onError(any(Throwable.class));
verify(w, times(1)).onComplete();
}
@Test
public void testDistinctUntilChangedOfNormalSource() {
Flowable<String> src = Flowable.just("a", "b", "c", "c", "c", "b", "b", "a", "e");
src.distinctUntilChanged().subscribe(w);
InOrder inOrder = inOrder(w);
inOrder.verify(w, times(1)).onNext("a");
inOrder.verify(w, times(1)).onNext("b");
inOrder.verify(w, times(1)).onNext("c");
inOrder.verify(w, times(1)).onNext("b");
inOrder.verify(w, times(1)).onNext("a");
inOrder.verify(w, times(1)).onNext("e");
inOrder.verify(w, times(1)).onComplete();
inOrder.verify(w, never()).onNext(anyString());
verify(w, never()).onError(any(Throwable.class));
}
@Test
public void testDistinctUntilChangedOfNormalSourceWithKeySelector() {
Flowable<String> src = Flowable.just("a", "b", "c", "C", "c", "B", "b", "a", "e");
src.distinctUntilChanged(TO_UPPER_WITH_EXCEPTION).subscribe(w);
InOrder inOrder = inOrder(w);
inOrder.verify(w, times(1)).onNext("a");
inOrder.verify(w, times(1)).onNext("b");
inOrder.verify(w, times(1)).onNext("c");
inOrder.verify(w, times(1)).onNext("B");
inOrder.verify(w, times(1)).onNext("a");
inOrder.verify(w, times(1)).onNext("e");
inOrder.verify(w, times(1)).onComplete();
inOrder.verify(w, never()).onNext(anyString());
verify(w, never()).onError(any(Throwable.class));
}
@Test
@Ignore("Null values no longer allowed")
public void testDistinctUntilChangedOfSourceWithNulls() {
Flowable<String> src = Flowable.just(null, "a", "a", null, null, "b", null, null);
src.distinctUntilChanged().subscribe(w);
InOrder inOrder = inOrder(w);
inOrder.verify(w, times(1)).onNext(null);
inOrder.verify(w, times(1)).onNext("a");
inOrder.verify(w, times(1)).onNext(null);
inOrder.verify(w, times(1)).onNext("b");
inOrder.verify(w, times(1)).onNext(null);
inOrder.verify(w, times(1)).onComplete();
inOrder.verify(w, never()).onNext(anyString());
verify(w, never()).onError(any(Throwable.class));
}
@Test
@Ignore("Null values no longer allowed")
public void testDistinctUntilChangedOfSourceWithExceptionsFromKeySelector() {
Flowable<String> src = Flowable.just("a", "b", null, "c");
src.distinctUntilChanged(TO_UPPER_WITH_EXCEPTION).subscribe(w);
InOrder inOrder = inOrder(w);
inOrder.verify(w, times(1)).onNext("a");
inOrder.verify(w, times(1)).onNext("b");
verify(w, times(1)).onError(any(NullPointerException.class));
inOrder.verify(w, never()).onNext(anyString());
inOrder.verify(w, never()).onComplete();
}
@Test
public void directComparer() {
Flowable.fromArray(1, 2, 2, 3, 2, 4, 1, 1, 2)
.distinctUntilChanged(new BiPredicate<Integer, Integer>() {
@Override
public boolean test(Integer a, Integer b) {
return a.equals(b);
}
})
.test()
.assertResult(1, 2, 3, 2, 4, 1, 2);
}
@Test
public void directComparerConditional() {
Flowable.fromArray(1, 2, 2, 3, 2, 4, 1, 1, 2)
.distinctUntilChanged(new BiPredicate<Integer, Integer>() {
@Override
public boolean test(Integer a, Integer b) {
return a.equals(b);
}
})
.filter(new Predicate<Integer>() {
@Override
public boolean test(Integer v) {
return true;
}
})
.test()
.assertResult(1, 2, 3, 2, 4, 1, 2);
}
@Test
public void directComparerFused() {
Flowable.fromArray(1, 2, 2, 3, 2, 4, 1, 1, 2)
.distinctUntilChanged(new BiPredicate<Integer, Integer>() {
@Override
public boolean test(Integer a, Integer b) {
return a.equals(b);
}
})
.to(SubscriberFusion.<Integer>test(Long.MAX_VALUE, QueueSubscription.ANY, false))
.assertOf(SubscriberFusion.<Integer>assertFuseable())
.assertOf(SubscriberFusion.<Integer>assertFusionMode(QueueSubscription.SYNC))
.assertResult(1, 2, 3, 2, 4, 1, 2);
}
@Test
public void directComparerConditionalFused() {
Flowable.fromArray(1, 2, 2, 3, 2, 4, 1, 1, 2)
.distinctUntilChanged(new BiPredicate<Integer, Integer>() {
@Override
public boolean test(Integer a, Integer b) {
return a.equals(b);
}
})
.filter(new Predicate<Integer>() {
@Override
public boolean test(Integer v) {
return true;
}
})
.to(SubscriberFusion.<Integer>test(Long.MAX_VALUE, QueueSubscription.ANY, false))
.assertOf(SubscriberFusion.<Integer>assertFuseable())
.assertOf(SubscriberFusion.<Integer>assertFusionMode(QueueSubscription.SYNC))
.assertResult(1, 2, 3, 2, 4, 1, 2);
}
private static final Function<String, String> THROWS_NON_FATAL = new Function<String, String>() {
@Override
public String apply(String s) {
throw new RuntimeException();
}
};
@Test
public void testDistinctUntilChangedWhenNonFatalExceptionThrownByKeySelectorIsNotReportedByUpstream() {
Flowable<String> src = Flowable.just("a", "b", "null", "c");
final AtomicBoolean errorOccurred = new AtomicBoolean(false);
src
.doOnError(new Consumer<Throwable>() {
@Override
public void accept(Throwable t) {
errorOccurred.set(true);
}
})
.distinctUntilChanged(THROWS_NON_FATAL)
.subscribe(w);
Assert.assertFalse(errorOccurred.get());
}
@Test
public void customComparator() {
Flowable<String> source = Flowable.just("a", "b", "B", "A","a", "C");
TestSubscriber<String> ts = TestSubscriber.create();
source.distinctUntilChanged(new BiPredicate<String, String>() {
@Override
public boolean test(String a, String b) {
return a.compareToIgnoreCase(b) == 0;
}
})
.subscribe(ts);
ts.assertValues("a", "b", "A", "C");
ts.assertNoErrors();
ts.assertComplete();
}
@Test
public void customComparatorThrows() {
Flowable<String> source = Flowable.just("a", "b", "B", "A","a", "C");
TestSubscriber<String> ts = TestSubscriber.create();
source.distinctUntilChanged(new BiPredicate<String, String>() {
@Override
public boolean test(String a, String b) {
throw new TestException();
}
})
.subscribe(ts);
ts.assertValue("a");
ts.assertNotComplete();
ts.assertError(TestException.class);
}
@Test
public void fused() {
TestSubscriber<Integer> to = SubscriberFusion.newTest(QueueDisposable.ANY);
Flowable.just(1, 2, 2, 3, 3, 4, 5)
.distinctUntilChanged(new BiPredicate<Integer, Integer>() {
@Override
public boolean test(Integer a, Integer b) throws Exception {
return a.equals(b);
}
})
.subscribe(to);
to.assertOf(SubscriberFusion.<Integer>assertFuseable())
.assertOf(SubscriberFusion.<Integer>assertFusionMode(QueueDisposable.SYNC))
.assertResult(1, 2, 3, 4, 5)
;
}
@Test
public void fusedAsync() {
TestSubscriber<Integer> to = SubscriberFusion.newTest(QueueDisposable.ANY);
UnicastProcessor<Integer> up = UnicastProcessor.create();
up
.distinctUntilChanged(new BiPredicate<Integer, Integer>() {
@Override
public boolean test(Integer a, Integer b) throws Exception {
return a.equals(b);
}
})
.subscribe(to);
TestHelper.emit(up, 1, 2, 2, 3, 3, 4, 5);
to.assertOf(SubscriberFusion.<Integer>assertFuseable())
.assertOf(SubscriberFusion.<Integer>assertFusionMode(QueueDisposable.ASYNC))
.assertResult(1, 2, 3, 4, 5)
;
}
@Test
public void ignoreCancel() {
List<Throwable> errors = TestHelper.trackPluginErrors();
try {
new Flowable<Integer>() {
@Override
public void subscribeActual(Subscriber<? super Integer> s) {
s.onSubscribe(new BooleanSubscription());
s.onNext(1);
s.onNext(2);
s.onNext(3);
s.onError(new IOException());
s.onComplete();
}
}
.distinctUntilChanged(new BiPredicate<Integer, Integer>() {
@Override
public boolean test(Integer a, Integer b) throws Exception {
throw new TestException();
}
})
.test()
.assertFailure(TestException.class, 1);
TestHelper.assertUndeliverable(errors, 0, IOException.class);
} finally {
RxJavaPlugins.reset();
}
}
class Mutable {
int value;
}
@Test
public void mutableWithSelector() {
Mutable m = new Mutable();
PublishProcessor<Mutable> pp = PublishProcessor.create();
TestSubscriber<Mutable> ts = pp.distinctUntilChanged(new Function<Mutable, Object>() {
@Override
public Object apply(Mutable m) throws Exception {
return m.value;
}
})
.test();
pp.onNext(m);
m.value = 1;
pp.onNext(m);
pp.onComplete();
ts.assertResult(m, m);
}
@Test
public void conditionalNormal() {
Flowable.just(1, 2, 1, 3, 3, 4, 3, 5, 5)
.distinctUntilChanged()
.filter(new Predicate<Integer>() {
@Override
public boolean test(Integer v) throws Exception {
return v % 2 == 0;
}
})
.test()
.assertResult(2, 4);
}
@Test
public void conditionalNormal2() {
Flowable.just(1, 2, 1, 3, 3, 4, 3, 5, 5).hide()
.distinctUntilChanged()
.filter(new Predicate<Integer>() {
@Override
public boolean test(Integer v) throws Exception {
return v % 2 == 0;
}
})
.test()
.assertResult(2, 4);
}
@Test
public void conditionalNormal3() {
UnicastProcessor<Integer> up = UnicastProcessor.create();
TestSubscriber<Integer> ts = up.hide()
.distinctUntilChanged()
.filter(new Predicate<Integer>() {
@Override
public boolean test(Integer v) throws Exception {
return v % 2 == 0;
}
})
.test();
TestHelper.emit(up, 1, 2, 1, 3, 3, 4, 3, 5, 5);
ts
.assertResult(2, 4);
}
@Test
public void conditionalSelectorCrash() {
Flowable.just(1, 2, 1, 3, 3, 4, 3, 5, 5)
.distinctUntilChanged(new BiPredicate<Integer, Integer>() {
@Override
public boolean test(Integer a, Integer b) throws Exception {
throw new TestException();
}
})
.filter(new Predicate<Integer>() {
@Override
public boolean test(Integer v) throws Exception {
return v % 2 == 0;
}
})
.test()
.assertFailure(TestException.class);
}
@Test
public void conditionalFused() {
TestSubscriber<Integer> ts = SubscriberFusion.newTest(QueueSubscription.ANY);
Flowable.just(1, 2, 1, 3, 3, 4, 3, 5, 5)
.distinctUntilChanged()
.filter(new Predicate<Integer>() {
@Override
public boolean test(Integer v) throws Exception {
return v % 2 == 0;
}
})
.subscribe(ts);
SubscriberFusion.assertFusion(ts, QueueSubscription.SYNC)
.assertResult(2, 4);
}
@Test
public void conditionalAsyncFused() {
TestSubscriber<Integer> ts = SubscriberFusion.newTest(QueueSubscription.ANY);
UnicastProcessor<Integer> up = UnicastProcessor.create();
up
.distinctUntilChanged()
.filter(new Predicate<Integer>() {
@Override
public boolean test(Integer v) throws Exception {
return v % 2 == 0;
}
})
.subscribe(ts);
TestHelper.emit(up, 1, 2, 1, 3, 3, 4, 3, 5, 5);
SubscriberFusion.assertFusion(ts, QueueSubscription.ASYNC)
.assertResult(2, 4);
}
@Test
public void badSource() {
TestHelper.checkBadSourceFlowable(new Function<Flowable<Integer>, Object>() {
@Override
public Object apply(Flowable<Integer> f) throws Exception {
return f.distinctUntilChanged().filter(Functions.alwaysTrue());
}
}, false, 1, 1, 1);
}
}