/**
* 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.mockito.ArgumentMatchers.*;
import static org.mockito.Mockito.*;
import java.io.IOException;
import java.util.List;
import org.junit.*;
import org.mockito.InOrder;
import io.reactivex.*;
import io.reactivex.disposables.Disposables;
import io.reactivex.exceptions.TestException;
import io.reactivex.functions.*;
import io.reactivex.internal.fuseable.QueueDisposable;
import io.reactivex.observers.*;
import io.reactivex.plugins.RxJavaPlugins;
import io.reactivex.subjects.*;
public class ObservableDistinctUntilChangedTest {
Observer<String> w;
Observer<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.mockObserver();
w2 = TestHelper.mockObserver();
}
@Test
public void testDistinctUntilChangedOfNone() {
Observable<String> src = Observable.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() {
Observable<String> src = Observable.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() {
Observable<String> src = Observable.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() {
Observable<String> src = Observable.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() {
Observable<String> src = Observable.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() {
Observable<String> src = Observable.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 customComparator() {
Observable<String> source = Observable.just("a", "b", "B", "A","a", "C");
TestObserver<String> ts = TestObserver.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() {
Observable<String> source = Observable.just("a", "b", "B", "A","a", "C");
TestObserver<String> ts = TestObserver.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() {
TestObserver<Integer> to = ObserverFusion.newTest(QueueDisposable.ANY);
Observable.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(ObserverFusion.<Integer>assertFuseable())
.assertOf(ObserverFusion.<Integer>assertFusionMode(QueueDisposable.SYNC))
.assertResult(1, 2, 3, 4, 5)
;
}
@Test
public void fusedAsync() {
TestObserver<Integer> to = ObserverFusion.newTest(QueueDisposable.ANY);
UnicastSubject<Integer> up = UnicastSubject.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(ObserverFusion.<Integer>assertFuseable())
.assertOf(ObserverFusion.<Integer>assertFusionMode(QueueDisposable.ASYNC))
.assertResult(1, 2, 3, 4, 5)
;
}
@Test
public void ignoreCancel() {
List<Throwable> errors = TestHelper.trackPluginErrors();
try {
Observable.wrap(new ObservableSource<Integer>() {
@Override
public void subscribe(Observer<? super Integer> s) {
s.onSubscribe(Disposables.empty());
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();
PublishSubject<Mutable> pp = PublishSubject.create();
TestObserver<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);
}
}