content: /*
   * 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 com.google.android.exoplayer2.util;
  
  import static com.google.common.truth.Truth.assertThat;
  
  import androidx.test.core.app.ApplicationProvider;
  import androidx.test.ext.junit.runners.AndroidJUnit4;
  import java.io.File;
  import java.io.IOException;
  import java.io.InputStream;
  import java.io.OutputStream;
  import org.junit.After;
  import org.junit.Before;
  import org.junit.Test;
  import org.junit.runner.RunWith;
  
  /** Tests {@link AtomicFile}. */
  @RunWith(AndroidJUnit4.class)
  public final class AtomicFileTest {
  
    private File tempFolder;
    private File file;
    private AtomicFile atomicFile;
  
    @Before
    public void setUp() throws Exception {
      tempFolder =
          Util.createTempDirectory(ApplicationProvider.getApplicationContext(), "AtomicFileTest");
      file = new File(tempFolder, "atomicFile");
      atomicFile = new AtomicFile(file);
    }
  
    @After
    public void tearDown() throws Exception {
      Util.recursiveDelete(tempFolder);
    }
  
    @Test
    public void delete() throws Exception {
      assertThat(file.createNewFile()).isTrue();
      atomicFile.delete();
      assertThat(file.exists()).isFalse();
    }
  
    @Test
    public void writeRead() throws Exception {
      OutputStream output = atomicFile.startWrite();
      output.write(5);
      atomicFile.endWrite(output);
      output.close();
  
      assertRead();
  
      output = atomicFile.startWrite();
      output.write(5);
      output.write(6);
      output.close();
  
      assertRead();
  
      output = atomicFile.startWrite();
      output.write(6);
  
      assertRead();
      output.close();
  
      output = atomicFile.startWrite();
  
      assertRead();
      output.close();
    }
  
    private void assertRead() throws IOException {
      InputStream input = atomicFile.openRead();
      assertThat(input.read()).isEqualTo(5);
      assertThat(input.read()).isEqualTo(-1);
      input.close();
    }
  }
  