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Validating Format Parcelable Implementation in SmartTube

This test suite validates the Format class functionality in ExoPlayer, focusing on parcelable implementation and media format handling. The tests ensure proper serialization and deserialization of media format attributes including DRM, metadata, and color information.

Test Coverage Overview

The test suite provides comprehensive coverage of Format class serialization, specifically testing the Parcelable implementation. Key functionality includes:

DRM initialization data handling
Media format attributes verification
Metadata serialization
Color information preservation

Implementation Analysis

The testing approach utilizes JUnit4 with AndroidJUnit4 runner for Android-specific testing. The implementation follows a systematic pattern of creating a complex Format object with various media attributes, parceling it, and verifying the unparceled object matches the original.

Technical Details

Testing tools and configuration:

JUnit4 testing framework
AndroidJUnit4 test runner
Google Truth assertion library
ExoPlayer test utilities
Android Parcel mechanism

Best Practices Demonstrated

The test demonstrates several quality testing practices:

Comprehensive object construction with multiple attributes
Proper test data initialization
Clear test method naming
Effective use of assertion libraries
Resource cleanup with parcel recycling

yuliskov/smarttube

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

import static com.google.android.exoplayer2.C.WIDEVINE_UUID;
import static com.google.android.exoplayer2.util.MimeTypes.VIDEO_MP4;
import static com.google.android.exoplayer2.util.MimeTypes.VIDEO_WEBM;
import static com.google.common.truth.Truth.assertThat;

import android.os.Parcel;
import androidx.test.ext.junit.runners.AndroidJUnit4;
import com.google.android.exoplayer2.drm.DrmInitData;
import com.google.android.exoplayer2.metadata.Metadata;
import com.google.android.exoplayer2.metadata.id3.TextInformationFrame;
import com.google.android.exoplayer2.testutil.TestUtil;
import com.google.android.exoplayer2.util.MimeTypes;
import com.google.android.exoplayer2.video.ColorInfo;
import java.util.ArrayList;
import java.util.Collections;
import java.util.List;
import org.junit.Test;
import org.junit.runner.RunWith;

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

  private static final List<byte[]> initData;
  static {
    byte[] initData1 = new byte[] {1, 2, 3};
    byte[] initData2 = new byte[] {4, 5, 6};
    List<byte[]> initDataList = new ArrayList<>();
    initDataList.add(initData1);
    initDataList.add(initData2);
    initData = Collections.unmodifiableList(initDataList);
  }

  @Test
  public void testParcelable() {
    DrmInitData.SchemeData drmData1 = new DrmInitData.SchemeData(WIDEVINE_UUID, VIDEO_MP4,
        TestUtil.buildTestData(128, 1 /* data seed */));
    DrmInitData.SchemeData drmData2 = new DrmInitData.SchemeData(C.UUID_NIL, VIDEO_WEBM,
        TestUtil.buildTestData(128, 1 /* data seed */));
    DrmInitData drmInitData = new DrmInitData(drmData1, drmData2);
    byte[] projectionData = new byte[] {1, 2, 3};
    Metadata metadata = new Metadata(
        new TextInformationFrame("id1", "description1", "value1"),
        new TextInformationFrame("id2", "description2", "value2"));
    ColorInfo colorInfo =  new ColorInfo(C.COLOR_SPACE_BT709,
        C.COLOR_RANGE_LIMITED, C.COLOR_TRANSFER_SDR, new byte[] {1, 2, 3, 4, 5, 6, 7});

    Format formatToParcel =
        new Format(
            "id",
            "label",
            C.SELECTION_FLAG_DEFAULT,
            C.ROLE_FLAG_MAIN,
            /* bitrate= */ 1024,
            "codec",
            metadata,
            /* containerMimeType= */ MimeTypes.VIDEO_MP4,
            /* sampleMimeType= */ MimeTypes.VIDEO_H264,
            /* maxInputSize= */ 2048,
            initData,
            drmInitData,
            Format.OFFSET_SAMPLE_RELATIVE,
            /* width= */ 1920,
            /* height= */ 1080,
            /* frameRate= */ 24,
            /* rotationDegrees= */ 90,
            /* pixelWidthHeightRatio= */ 2,
            projectionData,
            C.STEREO_MODE_TOP_BOTTOM,
            colorInfo,
            /* channelCount= */ 6,
            /* sampleRate= */ 44100,
            C.ENCODING_PCM_24BIT,
            /* encoderDelay= */ 1001,
            /* encoderPadding= */ 1002,
            "language",
            /* accessibilityChannel= */ Format.NO_VALUE);

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

    Format formatFromParcel = Format.CREATOR.createFromParcel(parcel);
    assertThat(formatFromParcel).isEqualTo(formatToParcel);

    parcel.recycle();
  }

}