1/*
2 * Copyright 2017 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 *      http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17package androidx.work.impl.utils.taskexecutor;
18
19import org.junit.rules.TestWatcher;
20import org.junit.runner.Description;
21
22/**
23 * A {@link org.junit.Rule} that swaps the background executor used by WorkManager with a
24 * different one which executes each task synchronously.
25 * Adapted from {@link android.arch.core.executor.testing.InstantTaskExecutorRule}
26 */
27
28public class InstantTaskExecutorRule extends TestWatcher {
29    @Override
30    protected void starting(Description description) {
31        super.starting(description);
32        WorkManagerTaskExecutor.getInstance().setTaskExecutor(new TaskExecutor() {
33            @Override
34            public void postToMainThread(Runnable r) {
35                r.run();
36            }
37
38            @Override
39            public void executeOnBackgroundThread(Runnable r) {
40                r.run();
41            }
42        });
43    }
44
45    @Override
46    protected void finished(Description description) {
47        super.finished(description);
48        WorkManagerTaskExecutor.getInstance().setTaskExecutor(null);
49    }
50}
51