content: /*
   * Copyright (C) 2018 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.platform;
  
  import static com.google.common.truth.Truth.assertThat;
  
  import android.os.StrictMode;
  import androidx.test.ext.junit.runners.AndroidJUnit4;
  import java.io.IOException;
  import org.junit.Test;
  import org.junit.runner.RunWith;
  
  /**
   * Tests that using {@link ServiceLoaderWrapper} avoids StrictMode disk I/O errors in device
   * environments.
   */
  @RunWith(AndroidJUnit4.class)
  public class ServiceLoaderWrapperTest {
  
    @Test
    public void loadService_diskReadOn() throws IOException {
      disallowDiskReads();
  
      assertThat(ServiceLoaderWrapper.loadService(ServiceFixture.class).get(0))
          .isInstanceOf(ServiceFixtureImpl.class);
    }
  
    @Test
    public void loadService_noEntry() throws IOException {
      disallowDiskReads();
  
      assertThat(ServiceLoaderWrapper.loadService(ServiceLoaderWrapperTest.class)).isEmpty();
    }
  
    private static void disallowDiskReads() {
      StrictMode.setThreadPolicy(
          new StrictMode.ThreadPolicy.Builder().detectDiskReads().penaltyDeath().build());
    }
  }
  