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Validating Extractor Constants Implementation in SmartTube

This test suite validates core functionality of the Extractor interface in ExoPlayer’s media extraction framework. It ensures proper implementation of critical constant values and their alignment with the C media framework.

Test Coverage Overview

The test coverage focuses on validating constant definitions and their relationships in the Extractor interface. Key areas include:

Verification of RESULT_END_OF_INPUT constant alignment
Validation of constant value uniqueness
Testing of fundamental extractor result states

Implementation Analysis

The testing approach employs JUnit with AndroidJUnit4 runner for Android-specific test execution. The implementation uses Truth assertions for precise constant value comparison, ensuring clear test failure messages.

The test structure follows a focused unit testing pattern with explicit constant validation.

Technical Details

Testing infrastructure includes:

JUnit 4 testing framework
AndroidJUnit4 test runner
Google Truth assertion library
ExoPlayer core framework dependencies

Best Practices Demonstrated

The test suite exemplifies several testing best practices:

Clear test method naming conventions
Focused test scope for constant validation
Use of modern assertion libraries for readable tests
Proper test class documentation

yuliskov/smarttube

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

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

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

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

  @Test
  public void testConstants() {
    // Sanity check that constant values match those defined by {@link C}.
    assertThat(Extractor.RESULT_END_OF_INPUT).isEqualTo(C.RESULT_END_OF_INPUT);
    // Sanity check that the other constant values don't overlap.
    assertThat(C.RESULT_END_OF_INPUT != Extractor.RESULT_CONTINUE).isTrue();
    assertThat(C.RESULT_END_OF_INPUT != Extractor.RESULT_SEEK).isTrue();
  }

}