/**
* 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.junit.Assert.assertEquals;
import static org.mockito.Matchers.any;
import static org.mockito.Mockito.inOrder;
import static org.mockito.Mockito.mock;
import static org.mockito.Mockito.never;
import static org.mockito.Mockito.times;
import static org.mockito.Mockito.verify;
import java.util.Arrays;
import org.junit.Test;
import org.mockito.InOrder;
import rx.Observable;
import rx.Observer;
import rx.internal.util.RxRingBuffer;
import rx.observers.TestSubscriber;
import rx.schedulers.Schedulers;
public class OperatorSkipLastTest {
@Test
public void testSkipLastEmpty() {
Observable<String> observable = Observable.<String> empty().skipLast(2);
@SuppressWarnings("unchecked")
Observer<String> observer = mock(Observer.class);
observable.subscribe(observer);
verify(observer, never()).onNext(any(String.class));
verify(observer, never()).onError(any(Throwable.class));
verify(observer, times(1)).onCompleted();
}
@Test
public void testSkipLast1() {
Observable<String> observable = Observable.from(Arrays.asList("one", "two", "three")).skipLast(2);
@SuppressWarnings("unchecked")
Observer<String> observer = mock(Observer.class);
InOrder inOrder = inOrder(observer);
observable.subscribe(observer);
inOrder.verify(observer, never()).onNext("two");
inOrder.verify(observer, never()).onNext("three");
verify(observer, times(1)).onNext("one");
verify(observer, never()).onError(any(Throwable.class));
verify(observer, times(1)).onCompleted();
}
@Test
public void testSkipLast2() {
Observable<String> observable = Observable.from(Arrays.asList("one", "two")).skipLast(2);
@SuppressWarnings("unchecked")
Observer<String> observer = mock(Observer.class);
observable.subscribe(observer);
verify(observer, never()).onNext(any(String.class));
verify(observer, never()).onError(any(Throwable.class));
verify(observer, times(1)).onCompleted();
}
@Test
public void testSkipLastWithZeroCount() {
Observable<String> w = Observable.just("one", "two");
Observable<String> observable = w.skipLast(0);
@SuppressWarnings("unchecked")
Observer<String> observer = mock(Observer.class);
observable.subscribe(observer);
verify(observer, times(1)).onNext("one");
verify(observer, times(1)).onNext("two");
verify(observer, never()).onError(any(Throwable.class));
verify(observer, times(1)).onCompleted();
}
@Test
public void testSkipLastWithNull() {
Observable<String> observable = Observable.from(Arrays.asList("one", null, "two")).skipLast(1);
@SuppressWarnings("unchecked")
Observer<String> observer = mock(Observer.class);
observable.subscribe(observer);
verify(observer, times(1)).onNext("one");
verify(observer, times(1)).onNext(null);
verify(observer, never()).onNext("two");
verify(observer, never()).onError(any(Throwable.class));
verify(observer, times(1)).onCompleted();
}
@Test
public void testSkipLastWithBackpressure() {
Observable<Integer> o = Observable.range(0, RxRingBuffer.SIZE * 2).skipLast(RxRingBuffer.SIZE + 10);
TestSubscriber<Integer> ts = new TestSubscriber<Integer>();
o.observeOn(Schedulers.computation()).subscribe(ts);
ts.awaitTerminalEvent();
ts.assertNoErrors();
assertEquals((RxRingBuffer.SIZE) - 10, ts.getOnNextEvents().size());
}
@Test(expected = IndexOutOfBoundsException.class)
public void testSkipLastWithNegativeCount() {
Observable.just("one").skipLast(-1);
}
}