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Class that provides assertions for testing RxJava Observables.
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/* | |
* Copyright (C) 2015 Ribot Ltd. | |
* | |
* 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. | |
*/ | |
public class RxAssertions { | |
public static <T> ObservableAssertions<T> subscribeAssertingThat(Observable<T> observable) { | |
return new ObservableAssertions<>(observable); | |
} | |
public static class ObservableAssertions<T> { | |
private List<T> mResult; | |
private Throwable mError; | |
private boolean mCompleted; | |
public ObservableAssertions(Observable<T> observable) { | |
mCompleted = false; | |
mResult = new ArrayList<>(); | |
observable.subscribeOn(Schedulers.immediate()) | |
.subscribe(new Observer<T>() { | |
@Override | |
public void onCompleted() { | |
mCompleted = true; | |
} | |
@Override | |
public void onError(Throwable error) { | |
mError = error; | |
} | |
@Override | |
public void onNext(T item) { | |
mResult.add(item); | |
} | |
}); | |
} | |
public ObservableAssertions<T> completesSuccessfully() { | |
if (!mCompleted || mError != null) { | |
if (mError != null) mError.printStackTrace(); | |
throw new AssertionFailedError("Observable has not completed successfully - cause: " | |
+ (mError != null ? mError : "onComplete not called")); | |
} | |
return this; | |
} | |
public ObservableAssertions<T> fails() { | |
if (mError == null) { | |
throw new AssertionFailedError("Observable has not failed"); | |
} | |
return this; | |
} | |
public ObservableAssertions<T> failsWithError(Throwable throwable) { | |
fails(); | |
if (!throwable.equals(mError)) { | |
throw new AssertionFailedError("Observable has failed with a different error," + | |
" expected is " + throwable + " but thrown was " + mError); | |
} | |
return this; | |
} | |
public ObservableAssertions<T> hasSize(int numItemsExpected) { | |
if (numItemsExpected != mResult.size()) { | |
throw new AssertionFailedError("Observable has emitted " + mResult.size() | |
+ " items but expected was " + numItemsExpected); | |
} | |
return this; | |
} | |
@SafeVarargs | |
public final ObservableAssertions<T> emits(T... itemsExpected) { | |
completesSuccessfully(); | |
assertEmittedEquals(itemsExpected); | |
return this; | |
} | |
@SuppressWarnings("unchecked") | |
public ObservableAssertions<T> emits(Collection<T> itemsExpected) { | |
completesSuccessfully(); | |
assertEmittedEquals((T[]) itemsExpected.toArray()); | |
return this; | |
} | |
public ObservableAssertions<T> emitsNothing() { | |
completesSuccessfully(); | |
if (mResult.size() > 0) { | |
throw new AssertionFailedError("Observable has emitted " + mResult.size() + " items"); | |
} | |
return this; | |
} | |
private void assertEmittedEquals(T[] itemsExpected) { | |
hasSize(itemsExpected.length); | |
for (int i = 0; i < itemsExpected.length; i++) { | |
T expected = itemsExpected[i]; | |
T actual = mResult.get(i); | |
if (!expected.equals(actual)) { | |
throw new AssertionFailedError("Emitted item in position " + i + " does not match," + | |
" expected " + expected + " actual " + actual); | |
} | |
} | |
} | |
} | |
} |
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