Update for v5

analysis_options.yaml

@@ -14,6 +14,7 @@ linter:
      - prefer_constructors_over_static_methods
      - prefer_contains
      - annotate_overrides
+     - await_futures
 
 analyzer:
    exclude:

example/example.dart

@@ -3,8 +3,10 @@ import 'package:youtube_explode_dart/youtube_explode_dart.dart';
 Future<void> main() async {
   var yt = YoutubeExplode();
   var video = await yt.videos.get(VideoId('https://www.youtube.com/watch?v=bo_efYhYU2A'));
+  var streamManifest = await yt.videos.streamsClient.getManifest(VideoId('https://www.youtube.com/watch?v=bo_efYhYU2A'));
 
   print('Title: ${video.title}');
+  print(streamManifest.streams());
 
   // Close the YoutubeExplode's http client.
   yt.close();

lib/src/channels/channel_client.dart

@@ -1,6 +1,8 @@
 import '../extensions/helpers_extension.dart';
+import '../playlists/playlists.dart';
 import '../reverse_engineering/responses/responses.dart';
 import '../reverse_engineering/youtube_http_client.dart';
+import '../videos/video.dart';
 import '../videos/video_id.dart';
 import 'channel.dart';
 import 'channel_id.dart';
@@ -40,8 +42,8 @@ class ChannelClient {
   }
 
   /// Enumerates videos uploaded by the specified channel.
-  void getUploads(ChannelId id) async {
-    var playlist = 'UU${id.value.substringAfter('UC')}';
-    //TODO: Finish this after playlist
+  Stream<Video> getUploads(ChannelId id) {
+    var playlistId = 'UU${id.value.substringAfter('UC')}';
+    return PlaylistClient(_httpClient).getVideos(PlaylistId(playlistId));
   }
 }

lib/src/channels/channel_id.dart

@@ -8,9 +8,11 @@ class ChannelId extends Equatable {
   final String value;
 
   /// Initializes an instance of [ChannelId]
-  ChannelId(String value)
-      : value = parseChannelId(value) ??
-            ArgumentError.value(value, 'value', 'Invalid channel id.');
+  ChannelId(String value) : value = parseChannelId(value) {
+    if (this.value == null) {
+      throw ArgumentError.value(value, 'value', 'Invalid channel id');
+    }
+  }
 
   static bool validateChannelId(String id) {
     if (id.isNullOrWhiteSpace) {
@@ -48,6 +50,9 @@ class ChannelId extends Equatable {
     return null;
   }
 
+  @override
+  String toString() => '$value';
+
   @override
   List<Object> get props => [value];
 }

lib/src/channels/username.dart

@@ -6,13 +6,15 @@ class Username {
   final String value;
 
   /// Initializes an instance of [Username].
-  Username(String urlOrUsername)
-      : value = parseUsername(urlOrUsername) ??
-            ArgumentError.value(
-                urlOrUsername, 'urlOrUsername', 'Invalid username');
+  Username(String urlOrUsername) : value = parseUsername(urlOrUsername) {
+    if (value == null) {
+      throw ArgumentError.value(
+          urlOrUsername, 'urlOrUsername', 'Invalid username');
+    }
+  }
 
   static bool validateUsername(String name) {
-    if (!name.isNullOrWhiteSpace) {
+    if (name.isNullOrWhiteSpace) {
       return false;
     }
 
@@ -20,7 +22,7 @@ class Username {
       return false;
     }
 
-    return RegExp('[^0-9a-zA-Z]').hasMatch(name);
+    return !RegExp('[^0-9a-zA-Z]').hasMatch(name);
   }
 
   static String parseUsername(String nameOrUrl) {
@@ -35,7 +37,7 @@ class Username {
     var regMatch = RegExp(r'youtube\..+?/user/(.*?)(?:\?|&|/|$)')
         .firstMatch(nameOrUrl)
         ?.group(1);
-    if (regMatch.isNullOrWhiteSpace && validateUsername(regMatch)) {
+    if (!regMatch.isNullOrWhiteSpace && validateUsername(regMatch)) {
       return regMatch;
     }
     return null;

lib/src/exceptions/fatal_failure_exception.dart

@@ -4,8 +4,8 @@ import 'youtube_explode_exception.dart';
 
 /// Exception thrown when a fatal failure occurs.
 class FatalFailureException implements YoutubeExplodeException {
-
   /// Description message
+  @override
   final String message;
 
   /// Initializes an instance of [FatalFailureException]
@@ -18,7 +18,7 @@ Failed to perform an HTTP request to YouTube due to a fatal failure.
 In most cases, this error indicates that YouTube most likely changed something, which broke the library.
 If this issue persists, please report it on the project's GitHub page.
 Request: ${response.request}
-Response: $response
+Response: (${response.statusCode})
 ''';
 
   @override

lib/src/exceptions/transient_failure_exception.dart

@@ -4,6 +4,7 @@ import 'youtube_explode_exception.dart';
 
 /// Exception thrown when a fatal failure occurs.
 class TransientFailureException implements YoutubeExplodeException {
+  @override
   final String message;
 
   /// Initializes an instance of [TransientFailureException]

lib/src/exceptions/video_unavailable_exception.dart

@@ -6,6 +6,7 @@ import 'exceptions.dart';
 /// is private, or due to other reasons.
 class VideoUnavailableException implements VideoUnplayableException {
   /// Description message
+  @override
   final String message;
 
   /// Initializes an instance of [VideoUnavailableException]

lib/src/exceptions/video_unplayable_exception.dart

@@ -4,6 +4,7 @@ import 'youtube_explode_exception.dart';
 /// Exception thrown when the requested video is unplayable.
 class VideoUnplayableException implements YoutubeExplodeException {
   /// Description message
+  @override
   final String message;
 
   /// Initializes an instance of [VideoUnplayableException]

lib/src/extensions/helpers_extension.dart

@@ -23,7 +23,7 @@ extension StringUtility on String {
 
   ///
   String substringAfter(String separator) =>
-      substring(indexOf(separator) + length);
+      substring(indexOf(separator) + separator.length);
 
   static final _exp = RegExp(r'\D');
 
@@ -65,3 +65,25 @@ extension UriUtility on Uri {
     return replace(queryParameters: query);
   }
 }
+
+///
+extension GetOrNull<K, V> on Map<K, V> {
+  V getValue(K key) {
+    var v = this[key];
+    if (v == null) {
+      return null;
+    }
+    return v;
+  }
+}
+
+///
+extension GetOrNullMap on Map {
+  Map<String, dynamic> get(String key) {
+    var v = this[key];
+    if (v == null) {
+      return null;
+    }
+    return v;
+  }
+}

lib/src/playlists/playlist_client.dart

@@ -37,7 +37,7 @@ class PlaylistClient {
         var videoId = video.id;
 
         // Already added
-        if (encounteredVideoIds.add(videoId)) {
+        if (!encounteredVideoIds.add(videoId)) {
           continue;
         }
 

lib/src/playlists/playlist_id.dart

@@ -13,13 +13,15 @@ class PlaylistId {
   final String value;
 
   /// Initializes an instance of [PlaylistId]
-  PlaylistId(String idOrUrl)
-      : value = parsePlaylistId(idOrUrl) ??
-            ArgumentError.value(idOrUrl, 'idOrUrl', 'Invalid url.');
+  PlaylistId(String idOrUrl) : value = parsePlaylistId(idOrUrl) {
+    if (value == null) {
+      throw ArgumentError.value(idOrUrl, 'idOrUrl', 'Invalid url');
+    }
+  }
 
   /// Returns true if the given [playlistId] is valid.
   static bool validatePlaylistId(String playlistId) {
-    playlistId = playlistId.toLowerCase();
+    playlistId = playlistId.toUpperCase();
 
     if (playlistId.isNullOrWhiteSpace) {
       return false;
@@ -60,6 +62,10 @@ class PlaylistId {
       return null;
     }
 
+    if (validatePlaylistId(url)) {
+      return url;
+    }
+
     var regMatch = _regMatchExp.firstMatch(url)?.group(1);
     if (!regMatch.isNullOrWhiteSpace && validatePlaylistId(regMatch)) {
       return regMatch;
@@ -84,4 +90,7 @@ class PlaylistId {
     }
     return null;
   }
+
+  @override
+  String toString() => value;
 }

lib/src/reverse_engineering/heuristics.dart

@@ -177,7 +177,7 @@ extension VideoQualityUtil on VideoQuality {
     }
 
     var framerateRounded = (framerate / 10).ceil() * 10;
-    return '${getLabel}$framerateRounded';
+    return '${getLabel()}$framerateRounded';
   }
 
   static String getLabelFromTagWithFramerate(int itag, double framerate) {

lib/src/reverse_engineering/responses/channel_page.dart

@@ -2,6 +2,7 @@ import 'package:html/dom.dart';
 import 'package:html/parser.dart' as parser;
 
 import '../../exceptions/exceptions.dart';
+import '../../extensions/helpers_extension.dart';
 import '../../retry.dart';
 import '../youtube_http_client.dart';
 
@@ -13,7 +14,7 @@ class ChannelPage {
   String get channelUrl =>
       _root.querySelector('meta[property="og:url"]')?.attributes['content'];
 
-  String get channelId => channelId.substringAfter('channel/');
+  String get channelId => channelUrl.substringAfter('channel/');
 
   String get channelTitle =>
       _root.querySelector('meta[property="og:title"]')?.attributes['content'];
@@ -54,8 +55,3 @@ class ChannelPage {
     });
   }
 }
-
-extension on String {
-  String substringAfter(String separator) =>
-      substring(indexOf(separator) + length);
-}

lib/src/reverse_engineering/responses/dash_manifest.dart

@@ -23,7 +23,7 @@ class DashManifest {
   DashManifest.parse(String raw) : _root = xml.parse(raw);
 
   static Future<DashManifest> get(YoutubeHttpClient httpClient, dynamic url) {
-    retry(() async {
+    return retry(() async {
       var raw = await httpClient.getString(url);
       return DashManifest.parse(raw);
     });
@@ -34,35 +34,45 @@ class DashManifest {
 }
 
 class _StreamInfo extends StreamInfoProvider {
-  static final _contentLenExp = RegExp(r'clen[/=](\d+)');
+  static final _contentLenExp = RegExp(r'[/\?]clen[/=](\d+)');
   static final _containerExp = RegExp(r'mime[/=]\w*%2F([\w\d]*)');
 
   final xml.XmlElement _root;
 
   _StreamInfo(this._root);
 
+  @override
   int get tag => int.parse(_root.getAttribute('id'));
 
+  @override
   String get url => _root.getAttribute('BaseURL');
 
+  @override
   int get contentLength => int.parse(_root.getAttribute('contentLength') ??
       _contentLenExp.firstMatch(url).group(1));
 
+  @override
   int get bitrate => int.parse(_root.getAttribute('bandwidth'));
 
+  @override
   String get container =>
       Uri.decodeFull(_containerExp.firstMatch(url).group(1));
 
   bool get isAudioOnly =>
       _root.findElements('AudioChannelConfiguration').isNotEmpty;
 
+  @override
   String get audioCodec => isAudioOnly ? null : _root.getAttribute('codecs');
 
+  @override
   String get videoCodec => isAudioOnly ? _root.getAttribute('codecs') : null;
 
+  @override
   int get videoWidth => int.parse(_root.getAttribute('width'));
 
+  @override
   int get videoHeight => int.parse(_root.getAttribute('height'));
 
+  @override
   int get framerate => int.parse(_root.getAttribute('framerate'));
 }

lib/src/reverse_engineering/responses/embed_page.dart

@@ -2,9 +2,9 @@ import 'dart:convert';
 
 import 'package:html/dom.dart';
 import 'package:html/parser.dart' as parser;
-import '../../retry.dart';
 
 import '../../extensions/helpers_extension.dart';
+import '../../retry.dart';
 import '../youtube_http_client.dart';
 
 class EmbedPage {
@@ -26,7 +26,7 @@ class EmbedPage {
   String get _playerConfigJson => _root
       .getElementsByTagName('script')
       .map((e) => e.text)
-      .map((e) => _playerConfigExp.firstMatch(e).group(1))
+      .map((e) => _playerConfigExp.firstMatch(e)?.group(1))
       .firstWhere((e) => !e.isNullOrWhiteSpace, orElse: () => null);
 
   EmbedPage.parse(String raw) : _root = parser.parse(raw);
@@ -46,5 +46,5 @@ class _PlayerConfig {
 
   _PlayerConfig(this._root);
 
-  String get sourceUrl => 'https://youtube.com ${_root['assets']['js']}';
+  String get sourceUrl => 'https://youtube.com${_root['assets']['js']}';
 }

lib/src/reverse_engineering/responses/player_response.dart

@@ -1,7 +1,9 @@
 import 'dart:convert';
 
 import 'package:http_parser/http_parser.dart';
-import 'package:youtube_explode_dart/src/reverse_engineering/responses/stream_info_provider.dart';
+
+import '../../extensions/helpers_extension.dart';
+import 'stream_info_provider.dart';
 
 class PlayerResponse {
   // Json parsed map
@@ -11,15 +13,14 @@ class PlayerResponse {
 
   String get playabilityStatus => _root['playabilityStatus']['status'];
 
-  bool get isVideoAvailable => playabilityStatus != 'error';
+  bool get isVideoAvailable => playabilityStatus.toLowerCase() != 'error';
 
-  bool get isVideoPlayable => playabilityStatus == 'ok';
+  bool get isVideoPlayable => playabilityStatus.toLowerCase() == 'ok';
 
   String get videoTitle => _root['videoDetails']['title'];
 
   String get videoAuthor => _root['videoDetails']['author'];
 
-  //TODO: Check how this is formatted.
   DateTime get videoUploadDate => DateTime.parse(
       _root['microformat']['playerMicroformatRenderer']['uploadDate']);
 
@@ -29,7 +30,7 @@ class PlayerResponse {
       Duration(seconds: int.parse(_root['videoDetails']['lengthSeconds']));
 
   Iterable<String> get videoKeywords =>
-      _root['videoDetails']['keywords'].cast<String>() ?? const [];
+      _root['videoDetails']['keywords']?.cast<String>() ?? const [];
 
   String get videoDescription => _root['videoDetails']['shortDescription'];
 
@@ -41,35 +42,40 @@ class PlayerResponse {
           .get('playabilityStatus')
           ?.get('errorScreen')
           ?.get('playerLegacyDesktopYpcTrailerRenderer')
-          ?.get('trailerVideoId') ??
+          ?.getValue('trailerVideoId') ??
       Uri.splitQueryString(_root
               .get('playabilityStatus')
               ?.get('errorScreen')
               ?.get('')
               ?.get('ypcTrailerRenderer')
-              ?.get('playerVars') ??
+              ?.getValue('playerVars') ??
           '')['video_id'];
 
-  bool get isLive => _root['videoDetails'].get('isLive') ?? false;
+  bool get isLive => _root.get('videoDetails')?.getValue('isLive') ?? false;
 
   // Can be null
   String get hlsManifestUrl =>
-      _root.get('streamingData')?.get('hlsManifestUrl');
+      _root.get('streamingData')?.getValue('hlsManifestUrl');
 
   // Can be null
   String get dashManifestUrl =>
-      _root.get('streamingData')?.get('dashManifestUrl');
+      _root.get('streamingData')?.getValue('dashManifestUrl');
 
   Iterable<StreamInfoProvider> get muxedStreams =>
-      _root?.get('streamingData')?.get('formats')?.map((e) => _StreamInfo(e)) ??
-      const [];
+      _root
+          ?.get('streamingData')
+          ?.getValue('formats')
+          ?.map((e) => _StreamInfo(e))
+          ?.cast<StreamInfoProvider>() ??
+      const <StreamInfoProvider>[];
 
   Iterable<StreamInfoProvider> get adaptiveStreams =>
       _root
           ?.get('streamingData')
-          ?.get('adaptiveFormats')
-          ?.map((e) => _StreamInfo(e)) ??
-      const [];
+          ?.getValue('adaptiveFormats')
+          ?.map((e) => _StreamInfo(e))
+          ?.cast<StreamInfoProvider>() ??
+      const <StreamInfoProvider>[];
 
   Iterable<StreamInfoProvider> get streams =>
       [...muxedStreams, ...adaptiveStreams];
@@ -78,12 +84,12 @@ class PlayerResponse {
       _root
           .get('captions')
           ?.get('playerCaptionsTracklistRenderer')
-          ?.get('captionTracks')
+          ?.getValue('captionTracks')
           ?.map((e) => ClosedCaptionTrack(e)) ??
       const [];
 
   String getVideoPlayabilityError() =>
-      _root.get('playabilityStatus')?.get('reason');
+      _root.get('playabilityStatus')?.getValue('reason');
 
   PlayerResponse.parse(String raw) : _root = json.decode(raw);
 }
@@ -115,64 +121,58 @@ class _StreamInfo extends StreamInfoProvider {
   @override
   String get container => mimeType.subtype;
 
+  static final _contentLenExp = RegExp(r'[\?&]clen=(\d+)');
+
   @override
   int get contentLength =>
-      _root['contentLength'] ??
-      StreamInfoProvider.contentLenExp.firstMatch(url).group(1);
+      int.tryParse(_root['contentLength'] ?? '') ??
+      _contentLenExp.firstMatch(url)?.group(1);
 
   @override
-  int get framerate => int.tryParse(_root['fps'] ?? '');
+  int get framerate => _root['fps'];
 
   @override
-  String get signature => Uri.splitQueryString(_root.get('cipher') ?? '')['s'];
+  String get signature =>
+      Uri.splitQueryString(_root['signatureCipher'] ?? '')['s'];
 
   @override
   String get signatureParameter =>
-      Uri.splitQueryString(_root['cipher'] ?? '')['sp'];
+      Uri.splitQueryString(_root['cipher'] ?? '')['sp'] ??
+      Uri.splitQueryString(_root['signatureCipher'] ?? '')['sp'];
 
   @override
-  int get tag => int.parse(_root['itag']);
+  int get tag => _root['itag'];
 
   @override
-  String get url =>
-      _root?.get('url') ??
-      Uri.splitQueryString(_root?.get('cipher') ?? '')['s'];
+  String get url => _getUrl();
+
+  String _getUrl() {
+    var url = _root['url'];
+    url ??= Uri.splitQueryString(_root['cipher'] ?? '')['url'];
+    url ??= Uri.splitQueryString(_root['signatureCipher'] ?? '')['url'];
+    return url;
+  }
 
   @override
-  // TODO: implement videoCodec,  gotta debug how the mimeType is formatted
-  String get videoCodec => throw UnimplementedError();
+  String get videoCodec =>
+      isAudioOnly ? null : codecs.split(',').first.trim().nullIfWhitespace;
 
   @override
-  // TODO: implement videoHeight, gotta debug how the mimeType is formatted
   int get videoHeight => _root['height'];
 
   @override
-  // TODO: implement videoQualityLabel
   String get videoQualityLabel => _root['qualityLabel'];
 
   @override
-  // TODO: implement videoWidth
   int get videoWidth => _root['width'];
 
-  // TODO: implement audioOnly, gotta debug how the mimeType is formatted
-  bool get audioOnly => throw UnimplementedError();
+  bool get isAudioOnly => mimeType.type == 'audio';
 
   MediaType get mimeType => MediaType.parse(_root['mimeType']);
 
   String get codecs => mimeType?.parameters['codecs']?.toLowerCase();
 
   @override
-  // TODO: Finish implementing this, gotta debug how the mimeType is formatted
-  String get audioCodec => audioOnly ? codecs : throw UnimplementedError();
-}
-
-///
-extension GetOrNull<K, V> on Map<K, V> {
-  V get(K key) {
-    var v = this[key];
-    if (v == null) {
-      return null;
-    }
-    return v;
-  }
+  String get audioCodec =>
+      isAudioOnly ? codecs : codecs.split(',').last.trim().nullIfWhitespace;
 }

lib/src/reverse_engineering/responses/player_source.dart

@@ -19,12 +19,13 @@ class PlayerSource {
   PlayerSource(this._root);
 
   String get sts {
-    var val = RegExp(r'(?<=invalid namespace.*?;var \w\s*=)\d+')
+    var val = RegExp(r'(?<=invalid namespace.*?;\w+\s*=)\d+')
         .stringMatch(_root)
-        .nullIfWhitespace;
+        ?.nullIfWhitespace;
     if (val == null) {
       throw FatalFailureException('Could not find sts in player source.');
     }
+    return val;
   }
 
   Iterable<CipherOperation> getCiperOperations() sync* {
@@ -42,7 +43,7 @@ class PlayerSource {
     }
 
     for (var statement in funcBody.split(';')) {
-      var calledFuncName = _calledFuncNameExp.firstMatch(statement).group(1);
+      var calledFuncName = _calledFuncNameExp.firstMatch(statement)?.group(1);
       if (calledFuncName.isNullOrWhiteSpace) {
         continue;
       }
@@ -77,16 +78,18 @@ class PlayerSource {
     var funcName = _funcBodyExp.firstMatch(_root).group(1);
 
     var exp = RegExp(
-        r'(?!h\.)' '${RegExp.escape(funcName)}' r'=function\(\w+\)\{{(.*?)\}}');
+        r'(?!h\.)' '${RegExp.escape(funcName)}' r'=function\(\w+\)\{(.*?)\}');
     return exp.firstMatch(_root).group(1).nullIfWhitespace;
   }
 
   String _getDeciphererDefinitionBody(String deciphererFuncBody) {
     var funcName = _funcNameExp.firstMatch(deciphererFuncBody).group(1);
 
-    var exp = RegExp(r'var\s+'
+    var exp = RegExp(
+        r'var\s+'
         '${RegExp.escape(funcName)}'
-        r'=\{{(\w+:function\(\w+(,\w+)?\)\{{(.*?)\}}),?\}};');
+        r'=\{(\w+:function\(\w+(,\w+)?\)\{(.*?)\}),?\};',
+        dotAll: true);
     return exp.firstMatch(_root).group(0).nullIfWhitespace;
   }
 

lib/src/reverse_engineering/responses/playerlist_response.dart

@@ -1,6 +1,7 @@
 import 'dart:convert';
 
 import '../../exceptions/exceptions.dart';
+import '../../extensions/helpers_extension.dart';
 import '../../retry.dart';
 import '../youtube_http_client.dart';
 
@@ -16,14 +17,14 @@ class PlaylistResponse {
 
   String get description => _root['description'];
 
-  int get viewCount => int.tryParse(_root['views'] ?? '');
+  int get viewCount => _root['views'];
 
-  int get likeCount => int.tryParse(_root['likes']);
+  int get likeCount => _root['likes'];
 
-  int get dislikeCount => int.tryParse(_root['dislikes']);
+  int get dislikeCount => _root['dislikes'];
 
   Iterable<_Video> get videos =>
-      _root['video']?.map((e) => _Video(e)) ?? const [];
+      _root['video']?.map((e) => _Video(e))?.cast<_Video>() ?? const <_Video>[];
 
   PlaylistResponse.parse(String raw) : _root = json.tryDecode(raw) {
     if (_root == null) {
@@ -73,11 +74,11 @@ class _Video {
 
   Duration get duration => Duration(seconds: _root['length_seconds']);
 
-  int get viewCount => int.parse(_root['views'].stripNonDigits());
+  int get viewCount => int.parse((_root['views'] as String).stripNonDigits());
 
-  int get likes => int.parse(_root['likes']);
+  int get likes => _root['likes'];
 
-  int get dislikes => int.parse(_root['dislikes']);
+  int get dislikes => _root['dislikes'];
 
   Iterable<String> get keywords => RegExp(r'"[^\"]+"|\S+')
       .allMatches(_root['keywords'])
@@ -85,13 +86,6 @@ class _Video {
       .toList(growable: false);
 }
 
-extension on String {
-  static final _exp = RegExp(r'\D');
-
-  /// Strips out all non digit characters.
-  String stripNonDigits() => replaceAll(_exp, '');
-}
-
 extension on JsonCodec {
   dynamic tryDecode(String source) {
     try {

lib/src/reverse_engineering/responses/stream_info_provider.dart

@@ -1,7 +1,5 @@
-import 'package:http_parser/http_parser.dart';
-
 abstract class StreamInfoProvider {
-  static final contentLenExp = RegExp(r'clen=(\d+)');
+  static final RegExp contentLenExp = RegExp(r'clen=(\d+)');
 
   int get tag;
 

lib/src/reverse_engineering/responses/watch_page.dart

@@ -13,9 +13,8 @@ import 'player_response.dart';
 import 'stream_info_provider.dart';
 
 class WatchPage {
-  final RegExp _videoLikeExp = RegExp(r'label""\s*:\s*""([\d,\.]+) likes');
-  final RegExp _videoDislikeExp =
-      RegExp(r'label""\s*:\s*""([\d,\.]+) dislikes');
+  final RegExp _videoLikeExp = RegExp(r'"label"\s*:\s*"([\d,\.]+) likes"');
+  final RegExp _videoDislikeExp = RegExp(r'"label"\s*:\s*"([\d,\.]+) dislikes');
 
   final Document _root;
 
@@ -26,27 +25,49 @@ class WatchPage {
   bool get isVideoAvailable =>
       _root.querySelector('meta[property="og:url"]') != null;
 
-  //TODO: This does not work.
-  int get videoLikeCount => int.tryParse(_videoLikeExp
-          .firstMatch(_root.outerHtml)
-          ?.group(1)
-          ?.nullIfWhitespace
-          ?.stripNonDigits() ??
-      '');
+  //TODO: Update this to the new "parsing method" w/ regex "label"\s*:\s*"([\d,\.]+) likes"
+  int get videoLikeCount => int.parse(_root
+          .querySelector('.like-button-renderer-like-button')
+          ?.text
+          ?.stripNonDigits()
+          ?.nullIfWhitespace ??
+      '0');
 
-  //TODO: This does not work.
-  int get videoDislikeCount => int.tryParse(_videoDislikeExp
-          .firstMatch(_root.outerHtml)
-          ?.group(1)
-          ?.nullIfWhitespace
-          ?.stripNonDigits() ??
-      '');
+  //TODO: Update this to the new "parsing method" w/ regex "label"\s*:\s*"([\d,\.]+) dislikes"
+  int get videoDislikeCount => int.parse(_root
+          .querySelector('.like-button-renderer-dislike-button')
+          ?.text
+          ?.stripNonDigits()
+          ?.nullIfWhitespace ??
+      '0');
 
-  _PlayerConfig get playerConfig => _PlayerConfig(json.decode(_root
-      .getElementsByTagName('script')
-      .map((e) => e.text)
-      .map(_extractJson)
-      .firstWhere((e) => e != null)));
+  _PlayerConfig get playerConfig => _PlayerConfig(json.decode(
+      _matchJson(_extractJson(_root.getElementsByTagName('html').first.text))));
+
+  final String configSep = 'ytplayer.config = ';
+
+  String _extractJson(String html) {
+    return _matchJson(
+        html.substring(html.indexOf(configSep) + configSep.length));
+  }
+
+  String _matchJson(String str) {
+    var bracketCount = 0;
+    int lastI;
+    for (var i = 0; i < str.length; i++) {
+      lastI = i;
+      if (str[i] == '{') {
+        bracketCount++;
+      } else if (str[i] == '}') {
+        bracketCount--;
+      } else if (str[i] == ';') {
+        if (bracketCount == 0) {
+          return str.substring(0, i);
+        }
+      }
+    }
+    return str.substring(0, lastI+1);
+  }
 
   WatchPage.parse(String raw) : _root = parser.parse(raw);
 
@@ -67,14 +88,6 @@ class WatchPage {
       return result;
     });
   }
-
-  String _extractJson(String str) {
-    var startIndex = str.indexOf('ytplayer.config =');
-    var endIndex = str.indexOf(';ytplayer.load =');
-    if (startIndex == -1 || endIndex == -1) return null;
-
-    return str.substring(startIndex + 17, endIndex);
-  }
 }
 
 class _StreamInfo extends StreamInfoProvider {
@@ -149,28 +162,20 @@ class _PlayerConfig {
       PlayerResponse.parse(_root['args']['player_response']);
 
   List<_StreamInfo> get muxedStreams =>
-      _root['args']
-          .get('url_encoded_fmt_stream_map')
+      _root
+          .get('args')
+          ?.getValue('url_encoded_fmt_stream_map')
           ?.split(',')
           ?.map((e) => _StreamInfo(Uri.splitQueryString(e))) ??
       const [];
 
   List<_StreamInfo> get adaptiveStreams =>
-      _root['args']
-          .get('adaptive_fmts')
+      _root
+          .get('args')
+          ?.getValue('adaptive_fmts')
           ?.split(',')
           ?.map((e) => _StreamInfo(Uri.splitQueryString(e))) ??
       const [];
 
   List<_StreamInfo> get streams => [...muxedStreams, ...adaptiveStreams];
 }
-
-extension _GetOrNull<K, V> on Map<K, V> {
-  V get(K key) {
-    var v = this[key];
-    if (v == null) {
-      return null;
-    }
-    return v;
-  }
-}

lib/src/reverse_engineering/youtube_http_client.dart

@@ -1,4 +1,6 @@
 import 'package:http/http.dart';
+import 'package:meta/meta.dart';
+import 'package:youtube_explode_dart/src/videos/streams/streams.dart';
 
 import '../exceptions/exceptions.dart';
 
@@ -53,17 +55,29 @@ class YoutubeHttpClient {
 
   Stream<List<int>> getStream(dynamic url,
       {Map<String, String> headers,
-      int from,
-      int to,
+      @required StreamInfo streamInfo,
       bool validate = true}) async* {
-    var request = Request('get', url);
-    request.headers['range'] = 'bytes=$from-$to';
-    request.headers.addAll(_userAgent);
-    var response = await request.send();
-    if (validate) {
-      _validateResponse(response, response.statusCode);
+    if (!streamInfo.isRateLimited()) {
+      var request = Request('get', url);
+      request.headers.addAll(_userAgent);
+      var response = await request.send();
+      if (validate) {
+        _validateResponse(response, response.statusCode);
+      }
+      yield* response.stream;
+      return;
+    } else {
+      for (var i = 0; i < streamInfo.size.totalBytes; i += 9898989) {
+        var request = Request('get', url);
+        request.headers['range'] = 'bytes=$i-${i + 9898989}';
+        request.headers.addAll(_userAgent);
+        var response = await request.send();
+        if (validate) {
+          _validateResponse(response, response.statusCode);
+        }
+        yield* response.stream;
+      }
     }
-    yield* response.stream;
   }
 
   Future<int> getContentLength(dynamic url,
@@ -74,7 +88,7 @@ class YoutubeHttpClient {
       _validateResponse(response, response.statusCode);
     }
 
-    return int.parse(response.headers['content-length']);
+    return int.tryParse(response.headers['content-length'] ?? '');
   }
 
   /// Closes the [Client] assigned to this [YoutubeHttpClient].

lib/src/videos/closed_captions/closed_caption_manifest.dart

@@ -1,6 +1,6 @@
 import 'dart:collection';
 
-import 'package:youtube_explode_dart/src/videos/closed_captions/closed_caption_track_info.dart';
+import 'closed_caption_track_info.dart';
 
 /// Manifest that contains information about available closed caption tracks
 /// in a specific video.

lib/src/videos/streams/audio_only_stream_info.dart

@@ -1,7 +1,4 @@
-import 'package:youtube_explode_dart/src/videos/streams/audio_stream_info.dart';
-import 'package:youtube_explode_dart/src/videos/streams/bitrate.dart';
-import 'package:youtube_explode_dart/src/videos/streams/container.dart';
-import 'package:youtube_explode_dart/src/videos/streams/filesize.dart';
+import 'streams.dart';
 
 /// YouTube media stream that only contains audio.
 class AudioOnlyStreamInfo implements AudioStreamInfo {

lib/src/videos/streams/audio_stream_info.dart

@@ -1,8 +1,4 @@
-import 'package:youtube_explode_dart/src/videos/streams/bitrate.dart';
-import 'package:youtube_explode_dart/src/videos/streams/container.dart';
-import 'package:youtube_explode_dart/src/videos/streams/filesize.dart';
-
-import 'stream_info.dart';
+import 'streams.dart';
 
 /// YouTube media stream that contains audio.
 abstract class AudioStreamInfo extends StreamInfo {

lib/src/videos/streams/bitrate.dart

@@ -7,8 +7,10 @@ class Bitrate extends Comparable<Bitrate> with EquatableMixin {
 
   /// Kilobits per second.
   double get kiloBitsPerSecond => bitsPerSecond / 1024;
+
   /// Megabits per second.
   double get megaBitsPerSecond => kiloBitsPerSecond / 1024;
+
   /// Gigabits per second.
   double get gigaBitsPerSecond => megaBitsPerSecond / 1024;
 
@@ -16,7 +18,7 @@ class Bitrate extends Comparable<Bitrate> with EquatableMixin {
   Bitrate(this.bitsPerSecond);
 
   @override
-  int compareTo(Bitrate other) => null;
+  int compareTo(Bitrate other) => bitsPerSecond.compareTo(other.bitsPerSecond);
 
   @override
   List<Object> get props => [bitsPerSecond];
@@ -49,4 +51,4 @@ class Bitrate extends Comparable<Bitrate> with EquatableMixin {
 
   @override
   String toString() => '${_getLargestValue()} ${_getLargestSymbol()}';
-}
+}

lib/src/videos/streams/filesize.dart

@@ -50,6 +50,5 @@ class FileSize extends Comparable<FileSize> with EquatableMixin {
   String toString() => '${_getLargestValue()} ${_getLargestSymbol()}';
 
   @override
-  // TODO: implement props
   List<Object> get props => [totalBytes];
 }

lib/src/videos/streams/framerate.dart

@@ -3,7 +3,7 @@ import 'package:equatable/equatable.dart';
 /// Encapsulates framerate.
 class Framerate extends Comparable<Framerate> with EquatableMixin {
   /// Framerate as frames per second
-  final double framesPerSecond;
+  final num framesPerSecond;
 
   /// Initialize an instance of [Framerate]
   Framerate(this.framesPerSecond);
@@ -23,8 +23,4 @@ class Framerate extends Comparable<Framerate> with EquatableMixin {
   @override
   int compareTo(Framerate other) =>
       framesPerSecond.compareTo(other.framesPerSecond);
-}
-
-void t() {
-  var t = Framerate(1.1) > Framerate(2.2);
-}
+}

lib/src/videos/streams/muxed_stream_info.dart

@@ -9,6 +9,7 @@ import 'video_stream_info.dart';
 
 /// YouTube media stream that contains both audio and video.
 class MuxedStreamInfo implements AudioStreamInfo, VideoStreamInfo {
+  @override
   final int tag;
 
   @override

lib/src/videos/streams/stream_info.dart

@@ -28,7 +28,7 @@ abstract class StreamInfo {
 extension StreamInfoExt on StreamInfo {
   static final _exp = RegExp('ratebypass[=/]yes');
 
-  bool _isRateLimited() => _exp.hasMatch(url.toString());
+  bool isRateLimited() => _exp.hasMatch(url.toString());
 
   /// Gets the stream with highest bitrate.
   static StreamInfo getHighestBitrate(List<StreamInfo> streams) =>

lib/src/videos/streams/stream_manifest.dart

@@ -1,12 +1,8 @@
 import 'dart:collection';
 
-import 'package:youtube_explode_dart/src/videos/streams/audio_only_stream_info.dart';
-import 'package:youtube_explode_dart/src/videos/streams/muxed_stream_info.dart';
-import 'package:youtube_explode_dart/src/videos/streams/video_only_stream_info.dart';
-import 'package:youtube_explode_dart/src/videos/streams/video_stream_info.dart';
-
 import 'audio_stream_info.dart';
 import 'stream_info.dart';
+import 'streams.dart';
 
 /// Manifest that contains information about available media streams
 /// in a specific video.

lib/src/videos/streams/streams_client.dart

@@ -58,13 +58,17 @@ class StreamsClient {
           reason: playerResponse.getVideoPlayabilityError());
     }
 
+    if (playerResponse.isLive) {
+      throw VideoUnplayableException.liveStream(videoId);
+    }
+
     var streamInfoProviders = <StreamInfoProvider>[
       ...videoInfoReponse.streams,
       ...playerResponse.streams
     ];
 
     var dashManifestUrl = playerResponse.dashManifestUrl;
-    if (dashManifestUrl.isNullOrWhiteSpace) {
+    if (!dashManifestUrl.isNullOrWhiteSpace) {
       var dashManifest =
           await _getDashManifest(Uri.parse(dashManifestUrl), cipherOperations);
       streamInfoProviders.addAll(dashManifest.streams);
@@ -106,7 +110,7 @@ class StreamsClient {
     ];
 
     var dashManifestUrl = playerResponse.dashManifestUrl;
-    if (dashManifestUrl.isNullOrWhiteSpace) {
+    if (!dashManifestUrl.isNullOrWhiteSpace) {
       var dashManifest =
           await _getDashManifest(Uri.parse(dashManifestUrl), cipherOperations);
       streamInfoProviders.addAll(dashManifest.streams);
@@ -243,7 +247,7 @@ class StreamsClient {
   //TODO: Test this
   /// Gets the actual stream which is identified by the specified metadata.
   Stream<List<int>> get(StreamInfo streamInfo) {
-    return _httpClient.getStream(streamInfo.url);
+    return _httpClient.getStream(streamInfo.url, streamInfo: streamInfo);
   }
 
 //TODO: Implement CopyToAsync

lib/src/videos/streams/video_resolution.dart

@@ -1,7 +1,5 @@
-import 'package:equatable/equatable.dart';
-
 /// Width and height of a video.
-class VideoResolution  {
+class VideoResolution {
   /// Viewport width.
   final int width;
 

lib/src/videos/streams/video_stream_info.dart

@@ -1,11 +1,4 @@
-import 'package:youtube_explode_dart/src/videos/streams/bitrate.dart';
-import 'package:youtube_explode_dart/src/videos/streams/container.dart';
-import 'package:youtube_explode_dart/src/videos/streams/filesize.dart';
-
-import 'framerate.dart';
-import 'stream_info.dart';
-import 'video_quality.dart';
-import 'video_resolution.dart';
+import 'streams.dart';
 
 /// YouTube media stream that contains video.
 abstract class VideoStreamInfo extends StreamInfo {

lib/src/videos/video.dart

@@ -1,7 +1,6 @@
 import 'dart:collection';
 
-import 'package:youtube_explode_dart/src/common/common.dart';
-
+import '../common/common.dart';
 import 'video_id.dart';
 
 /// YouTube video metadata.

lib/src/videos/video_id.dart

@@ -12,10 +12,12 @@ class VideoId extends Equatable {
   final String value;
 
   /// Initializes an instance of [VideoId] with a url or video id.
-  VideoId(String urlOrUrl)
-      : value = parseVideoId(urlOrUrl) ??
-            ArgumentError.value(
-                urlOrUrl, 'urlOrUrl', 'Invalid YouTube video ID or URL.');
+  VideoId(String idOrUrl) : value = parseVideoId(idOrUrl) {
+    if (value == null) {
+      throw ArgumentError.value(
+          idOrUrl, 'urlOrUrl', 'Invalid YouTube video ID or URL');
+    }
+  }
 
   @override
   String toString() => value;

pubspec.yaml

@@ -14,10 +14,6 @@ dependencies:
   equatable: ^1.1.0
 
 dev_dependencies:
-  quick_log: ^0.4.1
-
-  dart_benchmark:
-    path: ../repos/dart_benchmark
   effective_dart: ^1.2.1
   dart_console: ^0.5.0
   test: ^1.12.0

test/channel_id_test.dart

@@ -0,0 +1,35 @@
+import 'package:test/test.dart';
+import 'package:youtube_explode_dart/youtube_explode_dart.dart';
+
+void main() {
+  group('ChannelId', () {
+    test('ValidChannelId', () {
+      var channel1 = ChannelId('UCEnBXANsKmyj2r9xVyKoDiQ');
+      var channel2 = ChannelId('UC46807r_RiRjH8IU-h_DrDQ');
+
+      expect(channel1.value, 'UCEnBXANsKmyj2r9xVyKoDiQ');
+      expect(channel2.value, 'UC46807r_RiRjH8IU-h_DrDQ');
+    });
+    test('ValidChannelUrl', () {
+      var channel1 = ChannelId('youtube.com/channel/UC3xnGqlcL3y-GXz5N3wiTJQ');
+      var channel2 = ChannelId('youtube.com/channel/UCkQO3QsgTpNTsOw6ujimT5Q');
+      var channel3 = ChannelId('youtube.com/channel/UCQtjJDOYluum87LA4sI6xcg');
+
+      expect(channel1.value, 'UC3xnGqlcL3y-GXz5N3wiTJQ');
+      expect(channel2.value, 'UCkQO3QsgTpNTsOw6ujimT5Q');
+      expect(channel3.value, 'UCQtjJDOYluum87LA4sI6xcg');
+    });
+    test('InvalidChannelId', () {
+      expect(() => ChannelId(''), throwsArgumentError);
+      expect(() => ChannelId('UC3xnGqlcL3y-GXz5N3wiTJ'), throwsArgumentError);
+      expect(() => ChannelId('UC3xnGqlcL y-GXz5N3wiTJQ'), throwsArgumentError);
+    });
+
+    test('InvalidChannelUrl', () {
+      expect(() => ChannelId('youtube.com/?channel=UCUC3xnGqlcL3y-GXz5N3wiTJQ'),
+          throwsArgumentError);
+      expect(() => ChannelId('youtube.com/channel/asd'), throwsArgumentError);
+      expect(() => ChannelId('youtube.com/'), throwsArgumentError);
+    });
+  });
+}

test/channel_test.dart

@@ -0,0 +1,74 @@
+import 'package:test/test.dart';
+import 'package:youtube_explode_dart/youtube_explode_dart.dart';
+
+void main() {
+  group('Channel', () {
+    YoutubeExplode yt;
+    setUp(() {
+      yt = YoutubeExplode();
+    });
+
+    tearDown(() {
+      yt.close();
+    });
+
+    test('GetMetadataOfChannel', () async {
+      var channelUrl =
+          'https://www.youtube.com/channel/UCEnBXANsKmyj2r9xVyKoDiQ';
+      var channel = await yt.channels.get(ChannelId(channelUrl));
+      expect(channel.url, channelUrl);
+      expect(channel.title, 'Tyrrrz');
+      expect(channel.logoUrl, isNotNull);
+      expect(channel.logoUrl, isNot(equalsIgnoringWhitespace('')));
+    });
+
+    test('GetMetadataOfAnyChannel', () async {
+      var channelId = ChannelId('UC46807r_RiRjH8IU-h_DrDQ');
+      var channel = await yt.channels.get(channelId);
+      expect(channel.id, channelId);
+
+      channelId = ChannelId('UCJ6td3C9QlPO9O_J5dF4ZzA');
+      channel = await yt.channels.get(channelId);
+      expect(channel.id, channelId);
+
+      channelId = ChannelId('UCiGm_E4ZwYSHV3bcW1pnSeQ');
+      channel = await yt.channels.get(channelId);
+      expect(channel.id, channelId);
+    });
+
+    test('GetMetadataOfAnyChannelByUser', () async {
+      var channel = await yt.channels.getByUsername(Username('TheTyrrr'));
+      expect(channel.id.value, 'UCEnBXANsKmyj2r9xVyKoDiQ');
+    });
+
+    test('GetMetadataOfAnyChannelByVideo', () async {
+      var channel = await yt.channels.getByVideo(VideoId('5NmxuoNyDss'));
+      expect(channel.id.value, 'UCEnBXANsKmyj2r9xVyKoDiQ');
+    });
+
+    test('GetVideosOfYoutubeChannel', () async {
+      var videos = await yt.channels
+          .getUploads(ChannelId(
+              'https://www.youtube.com/channel/UCEnBXANsKmyj2r9xVyKoDiQ'))
+          .toList();
+      expect(videos.length, greaterThanOrEqualTo(80));
+    });
+
+    test('GetVideosOfAnyYoutubeChannel', () async {
+      var videos = await yt.channels
+          .getUploads(ChannelId('UC46807r_RiRjH8IU-h_DrDQ'))
+          .toList();
+      expect(videos, isNotEmpty);
+
+      videos = await yt.channels
+          .getUploads(ChannelId('UCJ6td3C9QlPO9O_J5dF4ZzA'))
+          .toList();
+      expect(videos, isNotEmpty);
+
+      videos = await yt.channels
+          .getUploads(ChannelId('UCiGm_E4ZwYSHV3bcW1pnSeQ'))
+          .toList();
+      expect(videos, isNotEmpty);
+    });
+  });
+}

test/closed_caption_test.dart

@@ -0,0 +1 @@
+//TODO: Implement this

test/playlist_id_test.dart

@@ -0,0 +1,59 @@
+import 'package:test/test.dart';
+import 'package:youtube_explode_dart/youtube_explode_dart.dart';
+
+void main() {
+  group('PlaylistId', () {
+    test('ValidPlaylistId', () {
+      var data = const {
+        'PL601B2E69B03FAB9D',
+        'PLI5YfMzCfRtZ8eV576YoY3vIYrHjyVm_e',
+        'PLWwAypAcFRgKFlxtLbn_u14zddtDJj3mk',
+        'OLAK5uy_mtOdjCW76nDvf5yOzgcAVMYpJ5gcW5uKU',
+        'RD1hu8-y6fKg0',
+        'RDMMU-ty-2B02VY',
+        'RDCLAK5uy_lf8okgl2ygD075nhnJVjlfhwp8NsUgEbs',
+        'ULl6WWX-BgIiE',
+        'UUTMt7iMWa7jy0fNXIktwyLA',
+        'OLAK5uy_lLeonUugocG5J0EUAEDmbskX4emejKwcM',
+        'FLEnBXANsKmyj2r9xVyKoDiQ'
+      };
+      // ignore: avoid_function_literals_in_foreach_calls
+      data.forEach((playlistId) {
+        var playlist = PlaylistId(playlistId);
+        expect(playlist.value, playlistId);
+      });
+    });
+    test('ValidPlaylistUrl', () {
+      var data = const {
+        'youtube.com/playlist?list=PLOU2XLYxmsIJGErt5rrCqaSGTMyyqNt2H':
+            'PLOU2XLYxmsIJGErt5rrCqaSGTMyyqNt2H',
+        'youtube.com/watch?v=b8m9zhNAgKs&list=PL9tY0BWXOZFuFEG_GtOBZ8-8wbkH-NVAr':
+            'PL9tY0BWXOZFuFEG_GtOBZ8-8wbkH-NVAr',
+        'youtu.be/b8m9zhNAgKs/?list=PL9tY0BWXOZFuFEG_GtOBZ8-8wbkH-NVAr':
+            'PL9tY0BWXOZFuFEG_GtOBZ8-8wbkH-NVAr',
+        'youtube.com/embed/b8m9zhNAgKs/?list=PL9tY0BWXOZFuFEG_GtOBZ8-8wbkH-NVAr':
+            'PL9tY0BWXOZFuFEG_GtOBZ8-8wbkH-NVAr',
+        'youtube.com/watch?v=x2ZRoWQ0grU&list=RDEMNJhLy4rECJ_fG8NL-joqsg':
+            'RDEMNJhLy4rECJ_fG8NL-joqsg'
+      };
+      data.forEach((url, playlistId) {
+        var playlist = PlaylistId(playlistId);
+        expect(playlist.value, playlistId);
+      });
+    });
+    test('InvalidPlaylistId', () {
+      expect(() => PlaylistId('PLm_3vnTS-pvmZFuF L1Pyhqf8kTTYVKjW'),
+          throwsArgumentError);
+      expect(() => PlaylistId('PLm_3vnTS-pvmZFuF3L=Pyhqf8kTTYVKjW'),
+          throwsArgumentError);
+    });
+    test('InvalidPlaylistUrl', () {
+      expect(() => PlaylistId('youtube.com/playlist?lisp=PLOU2XLYxmsIJGErt5rrCqaSGTMyyqNt2H'),
+          throwsArgumentError);
+      expect(() => PlaylistId('youtube.com/playlist?list=asd'),
+          throwsArgumentError);
+      expect(() => PlaylistId('youtube.com/'),
+          throwsArgumentError);
+    });
+  });
+}

test/playlist_test.dart

@@ -0,0 +1,83 @@
+import 'package:test/test.dart';
+import 'package:youtube_explode_dart/youtube_explode_dart.dart';
+
+void main() {
+  group('Playlist', () {
+    YoutubeExplode yt;
+    setUp(() {
+      yt = YoutubeExplode();
+    });
+
+    tearDown(() {
+      yt.close();
+    });
+
+    test('GetMetadataOfPlaylist', () async {
+      var playlistUrl =
+          'https://www.youtube.com/playlist?list=PLr-IftNTIujSF-8tlGbZBQyGIT6TCF6Yd';
+      var playlist = await yt.playlists.get(PlaylistId(playlistUrl));
+      expect(playlist.id.value, 'PLr-IftNTIujSF-8tlGbZBQyGIT6TCF6Yd');
+      expect(playlist.url, playlistUrl);
+      expect(playlist.title, 'osu! Highlights');
+      expect(playlist.author, 'Tyrrrz');
+      expect(playlist.description, 'My best osu! plays');
+      expect(playlist.engagement.viewCount, greaterThanOrEqualTo(133));
+      expect(playlist.engagement.likeCount, greaterThanOrEqualTo(0));
+      expect(playlist.engagement.dislikeCount, greaterThanOrEqualTo(0));
+    });
+    test('GetMetadataOfAnyPlaylist', () async {
+      var data = {
+        'PLI5YfMzCfRtZ8eV576YoY3vIYrHjyVm_e',
+        'RD1hu8-y6fKg0',
+        'RDMMU-ty-2B02VY',
+        'RDCLAK5uy_lf8okgl2ygD075nhnJVjlfhwp8NsUgEbs',
+        'OLAK5uy_lLeonUugocG5J0EUAEDmbskX4emejKwcM',
+        'PL601B2E69B03FAB9D'
+      };
+      for (var playlistId in data) {
+        var playlist = await yt.playlists.get(PlaylistId(playlistId));
+        expect(playlist.id.value, playlistId);
+      }
+    });
+    test('GetVideosInPlaylist', () async {
+      var videos = await yt.playlists
+          .getVideos(PlaylistId(
+              'https://www.youtube.com/playlist?list=PLr-IftNTIujSF-8tlGbZBQyGIT6TCF6Yd'))
+          .toList();
+      expect(videos.length, greaterThanOrEqualTo(20));
+      expect(
+          videos.map((e) => e.id.value).toList(),
+          containsAll([
+            'B6N8-_rBTh8',
+            'F1bvjgTckMc',
+            'kMBzljXOb9g',
+            'LsNPjFXIPT8',
+            'fXYPMPglYTs',
+            'AI7ULzgf8RU',
+            'VoGpvg3xXoE',
+            'Qzu-fTdjeFY'
+          ]));
+    });
+    test('GetVideosInAnyPlaylist', () async {
+      var data = const {
+        'PL601B2E69B03FAB9D',
+        'PLI5YfMzCfRtZ8eV576YoY3vIYrHjyVm_e',
+        'PLWwAypAcFRgKFlxtLbn_u14zddtDJj3mk',
+        'OLAK5uy_mtOdjCW76nDvf5yOzgcAVMYpJ5gcW5uKU',
+        'RD1hu8-y6fKg0',
+        'RDMMU-ty-2B02VY',
+        'RDCLAK5uy_lf8okgl2ygD075nhnJVjlfhwp8NsUgEbs',
+        'ULl6WWX-BgIiE',
+        'UUTMt7iMWa7jy0fNXIktwyLA',
+        'OLAK5uy_lLeonUugocG5J0EUAEDmbskX4emejKwcM',
+        'FLEnBXANsKmyj2r9xVyKoDiQ'
+      };
+
+      for (var playlistId in data) {
+        var videos =
+            await yt.playlists.getVideos(PlaylistId(playlistId)).toList();
+        expect(videos, isNotEmpty);
+      }
+    });
+  });
+}

test/search_test.dart

@@ -0,0 +1 @@
+//TODO: Implement this

test/streams_test.dart

@@ -0,0 +1,70 @@
+import 'package:test/test.dart';
+import 'package:youtube_explode_dart/youtube_explode_dart.dart';
+
+void main() {
+  group('Streams', () {
+    YoutubeExplode yt;
+    setUp(() {
+      yt = YoutubeExplode();
+    });
+
+    tearDown(() {
+      yt.close();
+    });
+
+    test('GetStreamsOfAnyVideo', () async {
+      var data = {
+        '9bZkp7q19f0',
+        'SkRSXFQerZs',
+        'hySoCSoH-g8',
+        '_kmeFXjjGfk',
+        'MeJVWBSsPAY',
+        '5VGm0dczmHc',
+        'ZGdLIwrGHG8',
+        'rsAAeyAr-9Y',
+        'AI7ULzgf8RU'
+      };
+      for (var videoId in data) {
+        var manifest =
+            await yt.videos.streamsClient.getManifest(VideoId(videoId));
+        expect(manifest.streams, isNotEmpty);
+      }
+    }, skip: 'Working on it.');
+
+    test('GetStreamOfUnplayableVideo', () async {
+      expect(yt.videos.streamsClient.getManifest(VideoId('5qap5aO4i9A')),
+          throwsA(const TypeMatcher<VideoUnplayableException>()));
+    });
+    test('GetStreamOfPurchaseVideo', () async {
+      expect(yt.videos.streamsClient.getManifest(VideoId('p3dDcKOFXQg')),
+          throwsA(const TypeMatcher<VideoRequiresPurchaseException>()));
+    });
+    //TODO: Fix this with VideoRequiresPurchaseException.
+    test('GetStreamOfPurchaseVideo', () async {
+      expect(yt.videos.streamsClient.getManifest(VideoId('qld9w0b-1ao')),
+          throwsA(const TypeMatcher<VideoUnavailableException>()));
+      expect(yt.videos.streamsClient.getManifest(VideoId('pb_hHv3fByo')),
+          throwsA(const TypeMatcher<VideoUnavailableException>()));
+    });
+    test('GetStreamOfAnyPlayableVideo', () async {
+      var data = {
+        '9bZkp7q19f0',
+        'SkRSXFQerZs',
+        'hySoCSoH-g8',
+        '_kmeFXjjGfk',
+        'MeJVWBSsPAY',
+        '5VGm0dczmHc',
+        'ZGdLIwrGHG8',
+        'rsAAeyAr-9Y',
+      };
+      for (var videoId in data) {
+        var manifest =
+            await yt.videos.streamsClient.getManifest(VideoId(videoId));
+        for (var streamInfo in manifest.streams) {
+          var stream = await yt.videos.streamsClient.get(streamInfo).toList();
+          expect(stream, isNotEmpty);
+        }
+      }
+    });
+  });
+}

test/test.dart

@@ -1,47 +0,0 @@
-import 'package:test/test.dart';
-import 'package:youtube_explode_dart/youtube_explode_dart.dart';
-
-void main() {
-  test('Parse valid video id', () {
-    var id = 'en2D_5TzXCA';
-    expect(YoutubeExplode.parseVideoId(id), equals('en2D_5TzXCA'));
-  });
-
-  test('Parse id from youtube url', () {
-    var url = 'https://www.youtube.com/watch?v=en2D_5TzXCA';
-    expect(YoutubeExplode.parseVideoId(url), equals('en2D_5TzXCA'));
-  });
-
-  test('Get video title', () async {
-    var yt = YoutubeExplode();
-    var video = await yt.getVideo('en2D_5TzXCA');
-    expect(video.title, equals('Lady Gaga - Million Reasons'));
-    yt.close();
-  });
-
-  test('Parse invalid id', () {
-    var id = 'aaa';
-    expect(YoutubeExplode.parseVideoId(id), isNull);
-  });
-
-  test('Get video media stream', () async {
-    var yt = YoutubeExplode();
-    expect(await yt.getVideoMediaStream('en2D_5TzXCA'), isNotNull);
-    yt.close();
-  });
-
-  test('Get video media stream with invalid id', () async {
-    var yt = YoutubeExplode();
-    try {
-      await yt.getVideoMediaStream('aaa');
-      neverCalled();
-      // ignore: avoid_catches_without_on_clauses
-    } catch (e) {
-      expect(e, isArgumentError);
-    } finally {
-      yt.close();
-    }
-  });
-
-  // TODO: Implement more tests
-}

test/user_name_test.dart

@@ -0,0 +1,35 @@
+import 'package:test/test.dart';
+import 'package:youtube_explode_dart/youtube_explode_dart.dart';
+
+void main() {
+  group('Username', () {
+    test('ValidUsername', () {
+      var data = const {'TheTyrrr', 'KannibalenRecords', 'JClayton1994'};
+      // ignore: avoid_function_literals_in_foreach_calls
+      data.forEach((usernameStr) {
+        var username = Username(usernameStr);
+        expect(username.value, usernameStr);
+      });
+    });
+    test('ValidUsernameUrl', () {
+      var data = const {
+        'youtube.com/user/ProZD': 'ProZD',
+        'youtube.com/user/TheTyrrr': 'TheTyrrr',
+      };
+      data.forEach((url, usernameStr) {
+        var username = Username(url);
+        expect(username.value, usernameStr);
+      });
+    });
+    test('InvalidUsername', () {
+      expect(() => Username('The_Tyrrr'), throwsArgumentError);
+      expect(() => Username('0123456789ABCDEFGHIJK'), throwsArgumentError);
+      expect(() => Username('A1B2C3-'), throwsArgumentError);
+      expect(() => Username('=0123456789ABCDEF'), throwsArgumentError);
+    });
+    test('InvalidUsernameUrl', () {
+      expect(() => Username('youtube.com/user/P_roZD'), throwsArgumentError);
+      expect(() => Username('youtube.com/user/P_roZD'), throwsArgumentError);
+    });
+  });
+}

test/video_id_test.dart

@@ -0,0 +1,41 @@
+import 'package:test/test.dart';
+import 'package:youtube_explode_dart/youtube_explode_dart.dart';
+
+void main() {
+  group('VideoId', () {
+    test('ValidVideoId', () {
+      var data = const {
+        '9bZkp7q19f0',
+        '_kmeFXjjGfk',
+        'AI7ULzgf8RU',
+      };
+      // ignore: avoid_function_literals_in_foreach_calls
+      data.forEach((videoId) {
+        var video = VideoId(videoId);
+        expect(video.value, videoId);
+      });
+    });
+    test('ValidVideoUrl', () {
+      var data = const {
+        'youtube.com/watch?v=yIVRs6YSbOM': 'yIVRs6YSbOM',
+        'youtu.be/yIVRs6YSbOM': 'yIVRs6YSbOM',
+        'youtube.com/embed/yIVRs6YSbOM': 'yIVRs6YSbOM',
+      };
+      data.forEach((url, videoId) {
+        var video = VideoId(url);
+        expect(video.value, videoId);
+      });
+    });
+    test('InvalidVideoId', () {
+      expect(() => VideoId(''), throwsArgumentError);
+      expect(() => VideoId('pI2I2zqzeK'), throwsArgumentError);
+      expect(() => VideoId('pI2I2z zeKg'), throwsArgumentError);
+    });
+    test('InvalidVideoUrl', () {
+      expect(() => VideoId('youtube.com/xxx?v=pI2I2zqzeKg'),
+          throwsArgumentError);
+      expect(() => VideoId('youtu.be/watch?v=xxx'), throwsArgumentError);
+      expect(() => VideoId('youtube.com/embed/'), throwsArgumentError);
+    });
+  });
+}

test/video_test.dart

@@ -0,0 +1,57 @@
+import 'package:test/test.dart';
+import 'package:youtube_explode_dart/youtube_explode_dart.dart';
+
+void main() {
+  group('Video', () {
+    YoutubeExplode yt;
+    setUp(() {
+      yt = YoutubeExplode();
+    });
+
+    tearDown(() {
+      yt.close();
+    });
+
+    test('GetMetadataOfVideo', () async {
+      var videoUrl = 'https://www.youtube.com/watch?v=AI7ULzgf8RU';
+      var video = await yt.videos.get(VideoId(videoUrl));
+      expect(video.id.value, 'AI7ULzgf8RU');
+      expect(video.url, videoUrl);
+      expect(video.title, 'Aka no Ha [Another] +HDHR');
+      expect(video.author, 'Tyrrrz');
+      expect(video.uploadDate, DateTime(2017, 09, 30));
+      expect(video.description, contains('246pp'));
+      expect(video.duration, const Duration(minutes: 1, seconds: 48));
+      expect(video.thumbnails.lowResUrl, isNotNull);
+      expect(video.thumbnails.mediumResUrl, isNotNull);
+      expect(video.thumbnails.highResUrl, isNotNull);
+      expect(video.thumbnails.standardResUrl, isNotNull);
+      expect(video.thumbnails.maxResUrl, isNotNull);
+      expect(video.keywords, orderedEquals(["osu", "mouse", "rhythm game"]));
+      expect(video.engagement.viewCount, greaterThanOrEqualTo(134));
+      expect(video.engagement.likeCount, greaterThanOrEqualTo(5));
+      expect(video.engagement.dislikeCount, greaterThanOrEqualTo(0));
+    });
+
+    test('GetMetadataOfAnyVideo', () async {
+      var data = {
+        '9bZkp7q19f0',
+        'SkRSXFQerZs',
+        '5VGm0dczmHc',
+        'ZGdLIwrGHG8',
+        '5qap5aO4i9A'
+      };
+      for (var videoId in data) {
+        var video = await yt.videos.get(VideoId(videoId));
+        expect(video.id.value, videoId);
+      }
+    });
+
+    test('GetMetadataOfInvalidVideo', () async {
+      expect(() async => await yt.videos.get(VideoId('qld9w0b-1ao')),
+          throwsA(const TypeMatcher<VideoUnplayableException>()));
+      expect(() async => await yt.videos.get(VideoId('pb_hHv3fByo')),
+          throwsA(const TypeMatcher<VideoUnplayableException>()));
+    });
+  });
+}

tools/t2.dart

@@ -0,0 +1,5 @@
+import 'package:youtube_explode_dart/src/channels/channels.dart';
+
+void main() {
+  var u = Username('youtube.com/user/ProZD');
+}