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Testing AC3 Audio Extraction Capabilities in SmartTube

This test suite validates the functionality of the AC3 Extractor component in ExoPlayer, focusing on both standard AC3 and Enhanced AC3 (E-AC3) audio format processing. The tests ensure proper extraction and handling of audio samples in the context of transport stream processing.

Test Coverage Overview

The test suite provides targeted coverage for AC3 audio extraction capabilities:

Verification of standard AC3 audio sample extraction
Testing of Enhanced AC3 (E-AC3) sample processing
Integration with ExoPlayer’s transport stream handling
Validation of extractor behavior with different audio formats

Implementation Analysis

The testing approach utilizes JUnit with AndroidJUnit4 runner for Android-specific test execution. The implementation leverages ExtractorAsserts utility class for standardized behavior verification, employing a factory pattern through Ac3Extractor::new lambda expressions for test instance creation.

Tests are structured to validate both AC3 and E-AC3 format handling through sample files located in the ts/ test resources directory.

Technical Details

Testing Infrastructure:

JUnit test framework with AndroidJUnit4 runner
ExtractorAsserts utility for behavior validation
Sample audio files: sample.ac3 and sample.eac3
ExoPlayer core library integration

Best Practices Demonstrated

The test suite exemplifies several testing best practices:

Clear test method naming reflecting test purpose
Isolated test cases for different audio formats
Use of shared test utilities for consistent assertions
Proper exception handling in test methods
Efficient test setup using factory methods

yuliskov/smarttube

exoplayer-amzn-2.10.6/library/core/src/test/java/com/google/android/exoplayer2/extractor/ts/Ac3ExtractorTest.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.extractor.ts;

import androidx.test.ext.junit.runners.AndroidJUnit4;
import com.google.android.exoplayer2.testutil.ExtractorAsserts;
import org.junit.Test;
import org.junit.runner.RunWith;

/** Unit test for {@link Ac3Extractor}. */
@RunWith(AndroidJUnit4.class)
public final class Ac3ExtractorTest {

  @Test
  public void testAc3Sample() throws Exception {
    ExtractorAsserts.assertBehavior(Ac3Extractor::new, "ts/sample.ac3");
  }

  @Test
  public void testEAc3Sample() throws Exception {
    ExtractorAsserts.assertBehavior(Ac3Extractor::new, "ts/sample.eac3");
  }
}