/**
* Copyright 2014 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 rx.internal.operators;
import static org.mockito.Matchers.any;
import static org.mockito.Matchers.anyString;
import static org.mockito.Mockito.inOrder;
import static org.mockito.Mockito.never;
import static org.mockito.Mockito.times;
import static org.mockito.Mockito.verify;
import static org.mockito.MockitoAnnotations.initMocks;
import org.junit.Before;
import org.junit.Test;
import org.mockito.InOrder;
import org.mockito.Mock;
import rx.Observable;
import rx.Observer;
import rx.functions.Func1;
public class OperatorDistinctUntilChangedTest {
@Mock
Observer<String> w;
@Mock
Observer<String> w2;
// nulls lead to exceptions
final Func1<String, String> TO_UPPER_WITH_EXCEPTION = new Func1<String, String>() {
@Override
public String call(String s) {
if (s.equals("x")) {
return "xx";
}
return s.toUpperCase();
}
};
@Before
public void before() {
initMocks(this);
}
@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)).onCompleted();
}
@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)).onCompleted();
}
@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)).onCompleted();
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)).onCompleted();
inOrder.verify(w, never()).onNext(anyString());
verify(w, never()).onError(any(Throwable.class));
}
@Test
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)).onCompleted();
inOrder.verify(w, never()).onNext(anyString());
verify(w, never()).onError(any(Throwable.class));
}
@Test
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()).onCompleted();
}
}