Add tests

pubspec.yaml

@@ -12,4 +12,5 @@ dependencies:
 
 dev_dependencies:
   effective_dart: ^1.2.1
-  dart_console: ^0.5.0
+  dart_console: ^0.5.0
+  test: ^1.12.0

test/test.dart

@@ -0,0 +1,46 @@
+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();
+    var stream = yt.getVideoMediaStream('aaa').asStream();
+    stream.listen(neverCalled)
+      ..onError(expectAsync1((error) {
+        expect(error, isArgumentError);
+      }))
+      ..onDone(() {
+        yt.close();
+      });
+  });
+
+  // TODO: Implement more tests
+}