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Testing Data Scheme URI Handling Implementation in SmartTube

This test suite validates the DataSchemeDataSource class in ExoPlayer, focusing on handling data URIs with base64 and ASCII encoding. It verifies data reading, range requests, and error handling for data scheme URIs.

Test Coverage Overview

The test suite provides comprehensive coverage of DataSchemeDataSource functionality:

  • Base64 and ASCII data URI handling
  • Partial and sequential range reads
  • Invalid position and range request handling
  • Error cases for incorrect schemes and malformed data

Implementation Analysis

The testing approach uses JUnit with AndroidJUnit4 runner, implementing systematic verification of data source operations. Tests utilize DataSpec objects to define read parameters and employ assertion utilities for content verification.

Key patterns include setUp initialization, boundary testing, and expected exception validation.

Technical Details

Testing infrastructure includes:

  • JUnit 4 framework with AndroidJUnit4 runner
  • Custom DataSourceAsserts utility
  • Uri parsing and byte array manipulation
  • Base64 encoding validation

Best Practices Demonstrated

The test suite exemplifies quality testing practices:

  • Thorough setup and cleanup with @Before annotations
  • Comprehensive error case coverage
  • Clear test method naming and organization
  • Effective use of assertion utilities
  • Modular test data construction

yuliskov/smarttube

exoplayer-amzn-2.10.6/library/core/src/test/java/com/google/android/exoplayer2/upstream/DataSchemeDataSourceTest.java

            
/*
 * Copyright (C) 2017 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.upstream;

import static com.google.android.exoplayer2.C.RESULT_END_OF_INPUT;
import static com.google.common.truth.Truth.assertThat;
import static org.junit.Assert.fail;

import android.net.Uri;
import androidx.test.ext.junit.runners.AndroidJUnit4;
import com.google.android.exoplayer2.C;
import com.google.android.exoplayer2.util.Util;
import java.io.IOException;
import org.junit.Before;
import org.junit.Test;
import org.junit.runner.RunWith;

/** Unit tests for {@link DataSchemeDataSource}. */
@RunWith(AndroidJUnit4.class)
public final class DataSchemeDataSourceTest {

  private static final String DATA_SCHEME_URI =
      "data:text/plain;base64,eyJwcm92aWRlciI6IndpZGV2aW5lX3Rlc3QiLCJjb250ZW50X2lkIjoiTWpBeE5WOTBaV"
          + "0Z5Y3c9PSIsImtleV9pZHMiOlsiMDAwMDAwMDAwMDAwMDAwMDAwMDAwMDAwMDAwMDAwMDAiXX0=";
  private DataSource schemeDataDataSource;

  @Before
  public void setUp() {
    schemeDataDataSource = new DataSchemeDataSource();
  }

  @Test
  public void testBase64Data() throws IOException {
    DataSpec dataSpec = buildDataSpec(DATA_SCHEME_URI);
    DataSourceAsserts.assertDataSourceContent(
        schemeDataDataSource,
        dataSpec,
        Util.getUtf8Bytes(
            "{\"provider\":\"widevine_test\",\"content_id\":\"MjAxNV90ZWFycw==\",\"key_ids\":"
                + "[\"00000000000000000000000000000000\"]}"));
  }

  @Test
  public void testAsciiData() throws IOException {
    DataSourceAsserts.assertDataSourceContent(
        schemeDataDataSource,
        buildDataSpec("data:,A%20brief%20note"),
        Util.getUtf8Bytes("A brief note"));
  }

  @Test
  public void testPartialReads() throws IOException {
    byte[] buffer = new byte[18];
    DataSpec dataSpec = buildDataSpec("data:,012345678901234567");
    assertThat(schemeDataDataSource.open(dataSpec)).isEqualTo(18);
    assertThat(schemeDataDataSource.read(buffer, 0, 9)).isEqualTo(9);
    assertThat(schemeDataDataSource.read(buffer, 3, 0)).isEqualTo(0);
    assertThat(schemeDataDataSource.read(buffer, 9, 15)).isEqualTo(9);
    assertThat(schemeDataDataSource.read(buffer, 1, 0)).isEqualTo(0);
    assertThat(schemeDataDataSource.read(buffer, 1, 1)).isEqualTo(RESULT_END_OF_INPUT);
    assertThat(Util.fromUtf8Bytes(buffer, 0, 18)).isEqualTo("012345678901234567");
  }

  @Test
  public void testSequentialRangeRequests() throws IOException {
    DataSpec dataSpec =
        buildDataSpec(DATA_SCHEME_URI, /* position= */ 1, /* length= */ C.LENGTH_UNSET);
    DataSourceAsserts.assertDataSourceContent(
        schemeDataDataSource,
        dataSpec,
        Util.getUtf8Bytes(
            "\"provider\":\"widevine_test\",\"content_id\":\"MjAxNV90ZWFycw==\",\"key_ids\":"
                + "[\"00000000000000000000000000000000\"]}"));
    dataSpec = buildDataSpec(DATA_SCHEME_URI, /* position= */ 10, /* length= */ C.LENGTH_UNSET);
    DataSourceAsserts.assertDataSourceContent(
        schemeDataDataSource,
        dataSpec,
        Util.getUtf8Bytes(
            "\":\"widevine_test\",\"content_id\":\"MjAxNV90ZWFycw==\",\"key_ids\":"
                + "[\"00000000000000000000000000000000\"]}"));
    dataSpec = buildDataSpec(DATA_SCHEME_URI, /* position= */ 15, /* length= */ 5);
    DataSourceAsserts.assertDataSourceContent(
        schemeDataDataSource, dataSpec, Util.getUtf8Bytes("devin"));
  }

  @Test
  public void testInvalidStartPositionRequest() throws IOException {
    try {
      // Try to open a range starting one byte beyond the resource's length.
      schemeDataDataSource.open(
          buildDataSpec(DATA_SCHEME_URI, /* position= */ 108, /* length= */ C.LENGTH_UNSET));
      fail();
    } catch (DataSourceException e) {
      assertThat(e.reason).isEqualTo(DataSourceException.POSITION_OUT_OF_RANGE);
    }
  }

  @Test
  public void testRangeExceedingResourceLengthRequest() throws IOException {
    try {
      // Try to open a range exceeding the resource's length.
      schemeDataDataSource.open(
          buildDataSpec(DATA_SCHEME_URI, /* position= */ 97, /* length= */ 11));
      fail();
    } catch (DataSourceException e) {
      assertThat(e.reason).isEqualTo(DataSourceException.POSITION_OUT_OF_RANGE);
    }
  }

  @Test
  public void testIncorrectScheme() {
    try {
      schemeDataDataSource.open(buildDataSpec("http://www.google.com"));
      fail();
    } catch (IOException e) {
      // Expected.
    }
  }

  @Test
  public void testMalformedData() {
    try {
      schemeDataDataSource.open(buildDataSpec("data:text/plain;base64,,This%20is%20Content"));
      fail();
    } catch (IOException e) {
      // Expected.
    }
    try {
      schemeDataDataSource.open(buildDataSpec("data:text/plain;base64,IncorrectPadding=="));
      fail();
    } catch (IOException e) {
      // Expected.
    }
  }

  private static DataSpec buildDataSpec(String uriString) {
    return buildDataSpec(uriString, /* position= */ 0, /* length= */ C.LENGTH_UNSET);
  }

  private static DataSpec buildDataSpec(String uriString, int position, int length) {
    return new DataSpec(Uri.parse(uriString), position, length, /* key= */ null);
  }

}