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Testing TrackGroupArray Parcelable Implementation in SmartTube

This test suite validates the TrackGroupArray functionality in ExoPlayer, focusing on the parcelable implementation for media track groups. The tests ensure proper serialization and deserialization of track group data containing different media formats.

Test Coverage Overview

The test coverage focuses on the parcelable implementation of TrackGroupArray, verifying correct handling of multiple track groups with different media formats. Key test areas include:

Serialization of video (H264) and audio (AAC) format tracks
Track group bundling and unbundling
Parcel write and read operations
Object equality verification after parcel operations

Implementation Analysis

The testing approach utilizes JUnit4 with AndroidJUnit4 runner for Android-specific testing. The implementation demonstrates a systematic verification of the Parcelable interface, creating test track groups with different media formats, writing them to a parcel, and verifying the reconstruction matches the original object.

Technical Details

Testing tools and configuration:

JUnit4 test framework
AndroidJUnit4 test runner
Google Truth assertion library
Android Parcel mechanism
ExoPlayer Format and TrackGroup classes
MimeTypes for media format specification

Best Practices Demonstrated

The test suite exhibits several testing best practices:

Proper resource cleanup with parcel recycling
Clear test method naming
Comprehensive object equality verification
Efficient test data setup
Use of appropriate assertion libraries

yuliskov/smarttube

exoplayer-amzn-2.10.6/library/core/src/test/java/com/google/android/exoplayer2/source/TrackGroupArrayTest.java

            
/*
 * 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 com.google.android.exoplayer2.source;

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

import android.os.Parcel;
import androidx.test.ext.junit.runners.AndroidJUnit4;
import com.google.android.exoplayer2.Format;
import com.google.android.exoplayer2.util.MimeTypes;
import org.junit.Test;
import org.junit.runner.RunWith;

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

  @Test
  public void testParcelable() {
    Format format1 = Format.createSampleFormat("1", MimeTypes.VIDEO_H264, 0);
    Format format2 = Format.createSampleFormat("2", MimeTypes.AUDIO_AAC, 0);
    Format format3 = Format.createSampleFormat("3", MimeTypes.VIDEO_H264, 0);

    TrackGroup trackGroup1 = new TrackGroup(format1, format2);
    TrackGroup trackGroup2 = new TrackGroup(format3);

    TrackGroupArray trackGroupArrayToParcel = new TrackGroupArray(trackGroup1, trackGroup2);

    Parcel parcel = Parcel.obtain();
    trackGroupArrayToParcel.writeToParcel(parcel, 0);
    parcel.setDataPosition(0);

    TrackGroupArray trackGroupArrayFromParcel = TrackGroupArray.CREATOR.createFromParcel(parcel);
    assertThat(trackGroupArrayFromParcel).isEqualTo(trackGroupArrayToParcel);

    parcel.recycle();
  }
}