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TestObserverTest.java
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/**
* 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.observers;
import static org.junit.Assert.*;
import static org.mockito.Mockito.*;
import java.util.*;
import org.junit.*;
import org.junit.rules.ExpectedException;
import org.mockito.InOrder;
import rx.Notification;
import rx.Observable;
import rx.Observer;
import rx.exceptions.TestException;
import rx.subjects.PublishSubject;
public class TestObserverTest {
@Rule
public ExpectedException thrown = ExpectedException.none();
@Test
public void testAssert() {
Observable<Integer> oi = Observable.from(Arrays.asList(1, 2));
TestObserver<Integer> o = new TestObserver<Integer>();
oi.subscribe(o);
o.assertReceivedOnNext(Arrays.asList(1, 2));
assertEquals(2, o.getOnNextEvents().size());
o.assertTerminalEvent();
}
@Test
public void testAssertNotMatchCount() {
Observable<Integer> oi = Observable.from(Arrays.asList(1, 2));
TestObserver<Integer> o = new TestObserver<Integer>();
oi.subscribe(o);
thrown.expect(AssertionError.class);
thrown.expectMessage("Number of items does not match. Provided: 1 Actual: 2");
o.assertReceivedOnNext(Arrays.asList(1));
assertEquals(2, o.getOnNextEvents().size());
o.assertTerminalEvent();
}
@Test
public void testAssertNotMatchValue() {
Observable<Integer> oi = Observable.from(Arrays.asList(1, 2));
TestObserver<Integer> o = new TestObserver<Integer>();
oi.subscribe(o);
thrown.expect(AssertionError.class);
thrown.expectMessage("Value at index: 1 expected to be [3] (Integer) but was: [2] (Integer)");
o.assertReceivedOnNext(Arrays.asList(1, 3));
assertEquals(2, o.getOnNextEvents().size());
o.assertTerminalEvent();
}
@Test
public void testAssertTerminalEventNotReceived() {
PublishSubject<Integer> p = PublishSubject.create();
TestObserver<Integer> o = new TestObserver<Integer>();
p.subscribe(o);
p.onNext(1);
p.onNext(2);
thrown.expect(AssertionError.class);
thrown.expectMessage("No terminal events received.");
o.assertReceivedOnNext(Arrays.asList(1, 2));
assertEquals(2, o.getOnNextEvents().size());
o.assertTerminalEvent();
}
@Test
public void testWrappingMock() {
Observable<Integer> oi = Observable.from(Arrays.asList(1, 2));
@SuppressWarnings("unchecked")
Observer<Integer> mockObserver = mock(Observer.class);
oi.subscribe(new TestObserver<Integer>(mockObserver));
InOrder inOrder = inOrder(mockObserver);
inOrder.verify(mockObserver, times(1)).onNext(1);
inOrder.verify(mockObserver, times(1)).onNext(2);
inOrder.verify(mockObserver, times(1)).onCompleted();
inOrder.verifyNoMoreInteractions();
}
@Test
public void testWrappingMockWhenUnsubscribeInvolved() {
Observable<Integer> oi = Observable.from(Arrays.asList(1, 2, 3, 4, 5, 6, 7, 8, 9)).take(2);
@SuppressWarnings("unchecked")
Observer<Integer> mockObserver = mock(Observer.class);
oi.subscribe(new TestObserver<Integer>(mockObserver));
InOrder inOrder = inOrder(mockObserver);
inOrder.verify(mockObserver, times(1)).onNext(1);
inOrder.verify(mockObserver, times(1)).onNext(2);
inOrder.verify(mockObserver, times(1)).onCompleted();
inOrder.verifyNoMoreInteractions();
}
@Test
public void testErrorSwallowed() {
Observable.error(new RuntimeException()).subscribe(new TestObserver<Object>());
}
@Test
public void testGetEvents() {
TestObserver<Integer> to = new TestObserver<Integer>();
to.onNext(1);
to.onNext(2);
assertEquals(Arrays.<Object>asList(Arrays.asList(1, 2),
Collections.emptyList(),
Collections.emptyList()), to.getEvents());
to.onCompleted();
assertEquals(Arrays.<Object>asList(Arrays.asList(1, 2), Collections.emptyList(),
Collections.singletonList(Notification.createOnCompleted())), to.getEvents());
TestException ex = new TestException();
TestObserver<Integer> to2 = new TestObserver<Integer>();
to2.onNext(1);
to2.onNext(2);
assertEquals(Arrays.<Object>asList(Arrays.asList(1, 2),
Collections.emptyList(),
Collections.emptyList()), to2.getEvents());
to2.onError(ex);
assertEquals(Arrays.<Object>asList(
Arrays.asList(1, 2),
Collections.singletonList(ex),
Collections.emptyList()),
to2.getEvents());
}
@Test
public void testNullExpected() {
TestObserver<Integer> to = new TestObserver<Integer>();
to.onNext(1);
try {
to.assertReceivedOnNext(Arrays.asList((Integer)null));
} catch (AssertionError ex) {
// this is expected
return;
}
fail("Null element check assertion didn't happen!");
}
@Test
public void testNullActual() {
TestObserver<Integer> to = new TestObserver<Integer>();
to.onNext(null);
try {
to.assertReceivedOnNext(Arrays.asList(1));
} catch (AssertionError ex) {
// this is expected
return;
}
fail("Null element check assertion didn't happen!");
}
@Test
public void testTerminalErrorOnce() {
TestObserver<Integer> to = new TestObserver<Integer>();
to.onError(new TestException());
to.onError(new TestException());
try {
to.assertTerminalEvent();
} catch (AssertionError ex) {
// this is expected
return;
}
fail("Failed to report multiple onError terminal events!");
}
@Test
public void testTerminalCompletedOnce() {
TestObserver<Integer> to = new TestObserver<Integer>();
to.onCompleted();
to.onCompleted();
try {
to.assertTerminalEvent();
} catch (AssertionError ex) {
// this is expected
return;
}
fail("Failed to report multiple onError terminal events!");
}
@Test
public void testTerminalOneKind() {
TestObserver<Integer> to = new TestObserver<Integer>();
to.onError(new TestException());
to.onCompleted();
try {
to.assertTerminalEvent();
} catch (AssertionError ex) {
// this is expected
return;
}
fail("Failed to report multiple kinds of events!");
}
}