/**
* 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.any;
import static org.mockito.Mockito.*;
import java.util.NoSuchElementException;
import org.junit.Test;
import org.mockito.InOrder;
import io.reactivex.*;
import io.reactivex.exceptions.TestException;
import io.reactivex.functions.*;
public class ObservableLastTest {
@Test
public void testLastWithElements() {
Maybe<Integer> last = Observable.just(1, 2, 3).lastElement();
assertEquals(3, last.blockingGet().intValue());
}
@Test
public void testLastWithNoElements() {
Maybe<?> last = Observable.empty().lastElement();
assertNull(last.blockingGet());
}
@Test
public void testLastMultiSubscribe() {
Maybe<Integer> last = Observable.just(1, 2, 3).lastElement();
assertEquals(3, last.blockingGet().intValue());
assertEquals(3, last.blockingGet().intValue());
}
@Test
public void testLastViaObservable() {
Observable.just(1, 2, 3).lastElement();
}
@Test
public void testLast() {
Maybe<Integer> o = Observable.just(1, 2, 3).lastElement();
MaybeObserver<Integer> observer = TestHelper.mockMaybeObserver();
o.subscribe(observer);
InOrder inOrder = inOrder(observer);
inOrder.verify(observer, times(1)).onSuccess(3);
// inOrder.verify(observer, times(1)).onComplete();
inOrder.verifyNoMoreInteractions();
}
@Test
public void testLastWithOneElement() {
Maybe<Integer> o = Observable.just(1).lastElement();
MaybeObserver<Integer> observer = TestHelper.mockMaybeObserver();
o.subscribe(observer);
InOrder inOrder = inOrder(observer);
inOrder.verify(observer, times(1)).onSuccess(1);
// inOrder.verify(observer, times(1)).onComplete();
inOrder.verifyNoMoreInteractions();
}
@Test
public void testLastWithEmpty() {
Maybe<Integer> o = Observable.<Integer> empty().lastElement();
MaybeObserver<Integer> observer = TestHelper.mockMaybeObserver();
o.subscribe(observer);
InOrder inOrder = inOrder(observer);
inOrder.verify(observer).onComplete();
inOrder.verify(observer, never()).onError(any(Throwable.class));
inOrder.verifyNoMoreInteractions();
}
@Test
public void testLastWithPredicate() {
Maybe<Integer> o = Observable.just(1, 2, 3, 4, 5, 6)
.filter(new Predicate<Integer>() {
@Override
public boolean test(Integer t1) {
return t1 % 2 == 0;
}
})
.lastElement();
MaybeObserver<Integer> observer = TestHelper.mockMaybeObserver();
o.subscribe(observer);
InOrder inOrder = inOrder(observer);
inOrder.verify(observer, times(1)).onSuccess(6);
// inOrder.verify(observer, times(1)).onComplete();
inOrder.verifyNoMoreInteractions();
}
@Test
public void testLastWithPredicateAndOneElement() {
Maybe<Integer> o = Observable.just(1, 2)
.filter(
new Predicate<Integer>() {
@Override
public boolean test(Integer t1) {
return t1 % 2 == 0;
}
})
.lastElement();
MaybeObserver<Integer> observer = TestHelper.mockMaybeObserver();
o.subscribe(observer);
InOrder inOrder = inOrder(observer);
inOrder.verify(observer, times(1)).onSuccess(2);
// inOrder.verify(observer, times(1)).onComplete();
inOrder.verifyNoMoreInteractions();
}
@Test
public void testLastWithPredicateAndEmpty() {
Maybe<Integer> o = Observable.just(1)
.filter(
new Predicate<Integer>() {
@Override
public boolean test(Integer t1) {
return t1 % 2 == 0;
}
}).lastElement();
MaybeObserver<Integer> observer = TestHelper.mockMaybeObserver();
o.subscribe(observer);
InOrder inOrder = inOrder(observer);
inOrder.verify(observer).onComplete();
inOrder.verify(observer, never()).onError(any(Throwable.class));
inOrder.verifyNoMoreInteractions();
}
@Test
public void testLastOrDefault() {
Single<Integer> o = Observable.just(1, 2, 3)
.last(4);
SingleObserver<Integer> observer = TestHelper.mockSingleObserver();
o.subscribe(observer);
InOrder inOrder = inOrder(observer);
inOrder.verify(observer, times(1)).onSuccess(3);
// inOrder.verify(observer, times(1)).onComplete();
inOrder.verifyNoMoreInteractions();
}
@Test
public void testLastOrDefaultWithOneElement() {
Single<Integer> o = Observable.just(1).last(2);
SingleObserver<Integer> observer = TestHelper.mockSingleObserver();
o.subscribe(observer);
InOrder inOrder = inOrder(observer);
inOrder.verify(observer, times(1)).onSuccess(1);
// inOrder.verify(observer, times(1)).onComplete();
inOrder.verifyNoMoreInteractions();
}
@Test
public void testLastOrDefaultWithEmpty() {
Single<Integer> o = Observable.<Integer> empty()
.last(1);
SingleObserver<Integer> observer = TestHelper.mockSingleObserver();
o.subscribe(observer);
InOrder inOrder = inOrder(observer);
inOrder.verify(observer, times(1)).onSuccess(1);
// inOrder.verify(observer, times(1)).onComplete();
inOrder.verifyNoMoreInteractions();
}
@Test
public void testLastOrDefaultWithPredicate() {
Single<Integer> o = Observable.just(1, 2, 3, 4, 5, 6)
.filter(new Predicate<Integer>() {
@Override
public boolean test(Integer t1) {
return t1 % 2 == 0;
}
})
.last(8);
SingleObserver<Integer> observer = TestHelper.mockSingleObserver();
o.subscribe(observer);
InOrder inOrder = inOrder(observer);
inOrder.verify(observer, times(1)).onSuccess(6);
// inOrder.verify(observer, times(1)).onComplete();
inOrder.verifyNoMoreInteractions();
}
@Test
public void testLastOrDefaultWithPredicateAndOneElement() {
Single<Integer> o = Observable.just(1, 2)
.filter(new Predicate<Integer>() {
@Override
public boolean test(Integer t1) {
return t1 % 2 == 0;
}
})
.last(4);
SingleObserver<Integer> observer = TestHelper.mockSingleObserver();
o.subscribe(observer);
InOrder inOrder = inOrder(observer);
inOrder.verify(observer, times(1)).onSuccess(2);
// inOrder.verify(observer, times(1)).onComplete();
inOrder.verifyNoMoreInteractions();
}
@Test
public void testLastOrDefaultWithPredicateAndEmpty() {
Single<Integer> o = Observable.just(1)
.filter(
new Predicate<Integer>() {
@Override
public boolean test(Integer t1) {
return t1 % 2 == 0;
}
})
.last(2);
SingleObserver<Integer> observer = TestHelper.mockSingleObserver();
o.subscribe(observer);
InOrder inOrder = inOrder(observer);
inOrder.verify(observer, times(1)).onSuccess(2);
// inOrder.verify(observer, times(1)).onComplete();
inOrder.verifyNoMoreInteractions();
}
@Test
public void lastOrErrorNoElement() {
Observable.empty()
.lastOrError()
.test()
.assertNoValues()
.assertError(NoSuchElementException.class);
}
@Test
public void lastOrErrorOneElement() {
Observable.just(1)
.lastOrError()
.test()
.assertNoErrors()
.assertValue(1);
}
@Test
public void lastOrErrorMultipleElements() {
Observable.just(1, 2, 3)
.lastOrError()
.test()
.assertNoErrors()
.assertValue(3);
}
@Test
public void lastOrErrorError() {
Observable.error(new RuntimeException("error"))
.lastOrError()
.test()
.assertNoValues()
.assertErrorMessage("error")
.assertError(RuntimeException.class);
}
@Test
public void dispose() {
TestHelper.checkDisposed(Observable.never().lastElement().toObservable());
TestHelper.checkDisposed(Observable.never().lastElement());
TestHelper.checkDisposed(Observable.just(1).lastOrError().toObservable());
TestHelper.checkDisposed(Observable.just(1).lastOrError());
TestHelper.checkDisposed(Observable.just(1).last(2).toObservable());
TestHelper.checkDisposed(Observable.just(1).last(2));
}
@Test
public void doubleOnSubscribe() {
TestHelper.checkDoubleOnSubscribeObservableToMaybe(new Function<Observable<Object>, MaybeSource<Object>>() {
@Override
public MaybeSource<Object> apply(Observable<Object> o) throws Exception {
return o.lastElement();
}
});
TestHelper.checkDoubleOnSubscribeObservable(new Function<Observable<Object>, ObservableSource<Object>>() {
@Override
public ObservableSource<Object> apply(Observable<Object> o) throws Exception {
return o.lastElement().toObservable();
}
});
TestHelper.checkDoubleOnSubscribeObservableToSingle(new Function<Observable<Object>, SingleSource<Object>>() {
@Override
public SingleSource<Object> apply(Observable<Object> o) throws Exception {
return o.lastOrError();
}
});
TestHelper.checkDoubleOnSubscribeObservable(new Function<Observable<Object>, ObservableSource<Object>>() {
@Override
public ObservableSource<Object> apply(Observable<Object> o) throws Exception {
return o.lastOrError().toObservable();
}
});
TestHelper.checkDoubleOnSubscribeObservableToSingle(new Function<Observable<Object>, SingleSource<Object>>() {
@Override
public SingleSource<Object> apply(Observable<Object> o) throws Exception {
return o.last(2);
}
});
TestHelper.checkDoubleOnSubscribeObservable(new Function<Observable<Object>, ObservableSource<Object>>() {
@Override
public ObservableSource<Object> apply(Observable<Object> o) throws Exception {
return o.last(2).toObservable();
}
});
}
@Test
public void error() {
Observable.error(new TestException())
.lastElement()
.test()
.assertFailure(TestException.class);
}
@Test
public void errorLastOrErrorObservable() {
Observable.error(new TestException())
.lastOrError()
.toObservable()
.test()
.assertFailure(TestException.class);
}
@Test
public void emptyLastOrErrorObservable() {
Observable.empty()
.lastOrError()
.toObservable()
.test()
.assertFailure(NoSuchElementException.class);
}
}