NonExecutingRunner.java
/*
* Copyright (C) 2016 The Android Open Source Project
*
* 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 androidx.test.internal.runner;
import java.util.List;
import org.junit.runner.Description;
import org.junit.runner.Runner;
import org.junit.runner.manipulation.Filter;
import org.junit.runner.manipulation.Filterable;
import org.junit.runner.manipulation.NoTestsRemainException;
import org.junit.runner.manipulation.Sortable;
import org.junit.runner.manipulation.Sorter;
import org.junit.runner.notification.RunNotifier;
/**
* A {@link Runner} that does not actually run any tests but simply fires events for all leaf {@link
* Description} instances in the {@link Description} returned by the wrapped {@link Runner}.
*/
class NonExecutingRunner extends Runner implements Sortable, Filterable {
private final Runner runner;
NonExecutingRunner(Runner runner) {
this.runner = runner;
}
@Override
public Description getDescription() {
return runner.getDescription();
}
@Override
public void run(RunNotifier notifier) {
generateListOfTests(notifier, getDescription());
}
@Override
public void filter(Filter filter) throws NoTestsRemainException {
filter.apply(runner);
}
@Override
public void sort(Sorter sorter) {
sorter.apply(runner);
}
/**
* Generates a list of tests to run by recursing over the {@link Description} hierarchy and firing
* events to simulate the tests being run successfully.
*
* @param runNotifier the notifier to which the events are sent.
* @param description the description to traverse.
*/
private void generateListOfTests(RunNotifier runNotifier, Description description) {
List<Description> children = description.getChildren();
if (children.isEmpty()) {
runNotifier.fireTestStarted(description);
runNotifier.fireTestFinished(description);
} else {
for (Description child : children) {
generateListOfTests(runNotifier, child);
}
}
}
}