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Testing ReusableBufferedOutputStream Implementation in SmartTube

This test suite evaluates the functionality of ReusableBufferedOutputStream, a custom implementation for buffered output streaming in ExoPlayer. It focuses on verifying the stream’s ability to be reset and reused with different output destinations while maintaining data integrity.

Test Coverage Overview

The test coverage focuses on the reset functionality of ReusableBufferedOutputStream, verifying proper data handling and stream reusability. Key test areas include:

Buffer writing operations with different data sets
Stream reset functionality verification
Output validation across multiple stream instances
Data integrity checks after stream operations

Implementation Analysis

The testing approach utilizes JUnit4 with AndroidJUnit4 runner for Android-specific testing context. The implementation employs ByteArrayOutputStream for verification, using a pattern of write-verify-reset-verify to ensure proper stream functionality. Test data is prepared using UTF-8 encoded byte arrays for consistent testing conditions.

Technical Details

Testing tools and configuration include:

JUnit4 testing framework
AndroidJUnit4 test runner
Truth assertion library for verification
ByteArrayOutputStream for output capture
Custom buffer size configuration (1000 bytes)

Best Practices Demonstrated

The test suite demonstrates several testing best practices:

Clear test method naming convention
Proper resource management with stream closing
Isolated test cases with clean state between runs
Use of constant test data for consistency
Explicit buffer size specification for predictable behavior

yuliskov/smarttube

exoplayer-amzn-2.10.6/library/core/src/test/java/com/google/android/exoplayer2/util/ReusableBufferedOutputStreamTest.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 com.google.android.exoplayer2.util;

import static com.google.common.truth.Truth.assertThat;

import androidx.test.ext.junit.runners.AndroidJUnit4;
import java.io.ByteArrayOutputStream;
import org.junit.Test;
import org.junit.runner.RunWith;

/** Tests {@link ReusableBufferedOutputStream}. */
@RunWith(AndroidJUnit4.class)
public final class ReusableBufferedOutputStreamTest {

  private static final byte[] TEST_DATA_1 = Util.getUtf8Bytes("test data 1");
  private static final byte[] TEST_DATA_2 = Util.getUtf8Bytes("2 test data");

  @Test
  public void testReset() throws Exception {
    ByteArrayOutputStream byteArrayOutputStream1 = new ByteArrayOutputStream(1000);
    ReusableBufferedOutputStream outputStream = new ReusableBufferedOutputStream(
        byteArrayOutputStream1, 1000);
    outputStream.write(TEST_DATA_1);
    outputStream.close();

    ByteArrayOutputStream byteArrayOutputStream2 = new ByteArrayOutputStream(1000);
    outputStream.reset(byteArrayOutputStream2);
    outputStream.write(TEST_DATA_2);
    outputStream.close();

    assertThat(byteArrayOutputStream1.toByteArray()).isEqualTo(TEST_DATA_1);
    assertThat(byteArrayOutputStream2.toByteArray()).isEqualTo(TEST_DATA_2);
  }

}