/**
* 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.Mockito.*;
import java.util.*;
import org.junit.*;
import io.reactivex.*;
import io.reactivex.Observable;
import io.reactivex.Observer;
import io.reactivex.functions.*;
import io.reactivex.internal.functions.Functions;
import io.reactivex.internal.fuseable.QueueDisposable;
import io.reactivex.observers.*;
import io.reactivex.schedulers.Schedulers;
import io.reactivex.subjects.UnicastSubject;
public class ObservableMapTest {
Observer<String> stringObserver;
Observer<String> stringObserver2;
static final BiFunction<String, Integer, String> APPEND_INDEX = new BiFunction<String, Integer, String>() {
@Override
public String apply(String value, Integer index) {
return value + index;
}
};
@Before
public void before() {
stringObserver = TestHelper.mockObserver();
stringObserver2 = TestHelper.mockObserver();
}
@Test
public void testMap() {
Map<String, String> m1 = getMap("One");
Map<String, String> m2 = getMap("Two");
Observable<Map<String, String>> o = Observable.just(m1, m2);
Observable<String> m = o.map(new Function<Map<String, String>, String>() {
@Override
public String apply(Map<String, String> map) {
return map.get("firstName");
}
});
m.subscribe(stringObserver);
verify(stringObserver, never()).onError(any(Throwable.class));
verify(stringObserver, times(1)).onNext("OneFirst");
verify(stringObserver, times(1)).onNext("TwoFirst");
verify(stringObserver, times(1)).onComplete();
}
@Test
public void testMapMany() {
/* simulate a top-level async call which returns IDs */
Observable<Integer> ids = Observable.just(1, 2);
/* now simulate the behavior to take those IDs and perform nested async calls based on them */
Observable<String> m = ids.flatMap(new Function<Integer, Observable<String>>() {
@Override
public Observable<String> apply(Integer id) {
/* simulate making a nested async call which creates another Observable */
Observable<Map<String, String>> subObservable = null;
if (id == 1) {
Map<String, String> m1 = getMap("One");
Map<String, String> m2 = getMap("Two");
subObservable = Observable.just(m1, m2);
} else {
Map<String, String> m3 = getMap("Three");
Map<String, String> m4 = getMap("Four");
subObservable = Observable.just(m3, m4);
}
/* simulate kicking off the async call and performing a select on it to transform the data */
return subObservable.map(new Function<Map<String, String>, String>() {
@Override
public String apply(Map<String, String> map) {
return map.get("firstName");
}
});
}
});
m.subscribe(stringObserver);
verify(stringObserver, never()).onError(any(Throwable.class));
verify(stringObserver, times(1)).onNext("OneFirst");
verify(stringObserver, times(1)).onNext("TwoFirst");
verify(stringObserver, times(1)).onNext("ThreeFirst");
verify(stringObserver, times(1)).onNext("FourFirst");
verify(stringObserver, times(1)).onComplete();
}
@Test
public void testMapMany2() {
Map<String, String> m1 = getMap("One");
Map<String, String> m2 = getMap("Two");
Observable<Map<String, String>> observable1 = Observable.just(m1, m2);
Map<String, String> m3 = getMap("Three");
Map<String, String> m4 = getMap("Four");
Observable<Map<String, String>> observable2 = Observable.just(m3, m4);
Observable<Observable<Map<String, String>>> o = Observable.just(observable1, observable2);
Observable<String> m = o.flatMap(new Function<Observable<Map<String, String>>, Observable<String>>() {
@Override
public Observable<String> apply(Observable<Map<String, String>> o) {
return o.map(new Function<Map<String, String>, String>() {
@Override
public String apply(Map<String, String> map) {
return map.get("firstName");
}
});
}
});
m.subscribe(stringObserver);
verify(stringObserver, never()).onError(any(Throwable.class));
verify(stringObserver, times(1)).onNext("OneFirst");
verify(stringObserver, times(1)).onNext("TwoFirst");
verify(stringObserver, times(1)).onNext("ThreeFirst");
verify(stringObserver, times(1)).onNext("FourFirst");
verify(stringObserver, times(1)).onComplete();
}
@Test
public void testMapWithError() {
Observable<String> w = Observable.just("one", "fail", "two", "three", "fail");
Observable<String> m = w.map(new Function<String, String>() {
@Override
public String apply(String s) {
if ("fail".equals(s)) {
throw new RuntimeException("Forced Failure");
}
return s;
}
}).doOnError(new Consumer<Throwable>() {
@Override
public void accept(Throwable t1) {
t1.printStackTrace();
}
});
m.subscribe(stringObserver);
verify(stringObserver, times(1)).onNext("one");
verify(stringObserver, never()).onNext("two");
verify(stringObserver, never()).onNext("three");
verify(stringObserver, never()).onComplete();
verify(stringObserver, times(1)).onError(any(Throwable.class));
}
@Test(expected = IllegalArgumentException.class)
public void testMapWithIssue417() {
Observable.just(1).observeOn(Schedulers.computation())
.map(new Function<Integer, Integer>() {
@Override
public Integer apply(Integer arg0) {
throw new IllegalArgumentException("any error");
}
}).blockingSingle();
}
@Test(expected = IllegalArgumentException.class)
public void testMapWithErrorInFuncAndThreadPoolScheduler() throws InterruptedException {
// The error will throw in one of threads in the thread pool.
// If map does not handle it, the error will disappear.
// so map needs to handle the error by itself.
Observable<String> m = Observable.just("one")
.observeOn(Schedulers.computation())
.map(new Function<String, String>() {
@Override
public String apply(String arg0) {
throw new IllegalArgumentException("any error");
}
});
// block for response, expecting exception thrown
m.blockingLast();
}
/**
* While mapping over range(1,0).last() we expect NoSuchElementException since the sequence is empty.
*/
@Test
public void testErrorPassesThruMap() {
assertNull(Observable.range(1, 0).lastElement().map(new Function<Integer, Integer>() {
@Override
public Integer apply(Integer i) {
return i;
}
}).blockingGet());
}
/**
* We expect IllegalStateException to pass thru map.
*/
@Test(expected = IllegalStateException.class)
public void testErrorPassesThruMap2() {
Observable.error(new IllegalStateException()).map(new Function<Object, Object>() {
@Override
public Object apply(Object i) {
return i;
}
}).blockingSingle();
}
/**
* We expect an ArithmeticException exception here because last() emits a single value
* but then we divide by 0.
*/
@Test(expected = ArithmeticException.class)
public void testMapWithErrorInFunc() {
Observable.range(1, 1).lastElement().map(new Function<Integer, Integer>() {
@Override
public Integer apply(Integer i) {
return i / 0;
}
}).blockingGet();
}
// FIXME RS subscribers can't throw
// @Test(expected = OnErrorNotImplementedException.class)
// public void verifyExceptionIsThrownIfThereIsNoExceptionHandler() {
//
// ObservableSource<Object> creator = new ObservableSource<Object>() {
//
// @Override
// public void subscribeActual(Observer<? super Object> observer) {
// observer.onSubscribe(EmptyDisposable.INSTANCE);
// observer.onNext("a");
// observer.onNext("b");
// observer.onNext("c");
// observer.onComplete();
// }
// };
//
// Function<Object, Observable<Object>> manyMapper = new Function<Object, Observable<Object>>() {
//
// @Override
// public Observable<Object> apply(Object object) {
// return Observable.just(object);
// }
// };
//
// Function<Object, Object> mapper = new Function<Object, Object>() {
// private int count = 0;
//
// @Override
// public Object apply(Object object) {
// ++count;
// if (count > 2) {
// throw new RuntimeException();
// }
// return object;
// }
// };
//
// Consumer<Object> onNext = new Consumer<Object>() {
//
// @Override
// public void accept(Object object) {
// System.out.println(object.toString());
// }
// };
//
// try {
// Observable.unsafeCreate(creator).flatMap(manyMapper).map(mapper).subscribe(onNext);
// } catch (RuntimeException e) {
// e.printStackTrace();
// throw e;
// }
// }
private static Map<String, String> getMap(String prefix) {
Map<String, String> m = new HashMap<String, String>();
m.put("firstName", prefix + "First");
m.put("lastName", prefix + "Last");
return m;
}
// FIXME RS subscribers can't throw
// @Test(expected = OnErrorNotImplementedException.class)
// public void testShouldNotSwallowOnErrorNotImplementedException() {
// Observable.just("a", "b").flatMap(new Function<String, Observable<String>>() {
// @Override
// public Observable<String> apply(String s) {
// return Observable.just(s + "1", s + "2");
// }
// }).flatMap(new Function<String, Observable<String>>() {
// @Override
// public Observable<String> apply(String s) {
// return Observable.error(new Exception("test"));
// }
// }).forEach(new Consumer<String>() {
// @Override
// public void accept(String s) {
// System.out.println(s);
// }
// });
// }
@Test
public void dispose() {
TestHelper.checkDisposed(Observable.range(1, 5).map(Functions.identity()));
}
@Test
public void doubleOnSubscribe() {
TestHelper.checkDoubleOnSubscribeObservable(new Function<Observable<Object>, ObservableSource<Object>>() {
@Override
public ObservableSource<Object> apply(Observable<Object> o) throws Exception {
return o.map(Functions.identity());
}
});
}
@Test
public void fusedSync() {
TestObserver<Integer> to = ObserverFusion.newTest(QueueDisposable.ANY);
Observable.range(1, 5)
.map(Functions.<Integer>identity())
.subscribe(to);
ObserverFusion.assertFusion(to, QueueDisposable.SYNC)
.assertResult(1, 2, 3, 4, 5);
}
@Test
public void fusedAsync() {
TestObserver<Integer> to = ObserverFusion.newTest(QueueDisposable.ANY);
UnicastSubject<Integer> us = UnicastSubject.create();
us
.map(Functions.<Integer>identity())
.subscribe(to);
TestHelper.emit(us, 1, 2, 3, 4, 5);
ObserverFusion.assertFusion(to, QueueDisposable.ASYNC)
.assertResult(1, 2, 3, 4, 5);
}
@Test
public void fusedReject() {
TestObserver<Integer> to = ObserverFusion.newTest(QueueDisposable.ANY | QueueDisposable.BOUNDARY);
Observable.range(1, 5)
.map(Functions.<Integer>identity())
.subscribe(to);
ObserverFusion.assertFusion(to, QueueDisposable.NONE)
.assertResult(1, 2, 3, 4, 5);
}
@Test
public void badSource() {
TestHelper.checkBadSourceObservable(new Function<Observable<Object>, Object>() {
@Override
public Object apply(Observable<Object> o) throws Exception {
return o.map(Functions.identity());
}
}, false, 1, 1, 1);
}
}