added cli test

tests/contrib/test_playlist.py

@@ -88,7 +88,7 @@ def test_video_urls(request_get, playlist_html):
 
 @mock.patch("pytube.contrib.playlist.request.get")
 @mock.patch("pytube.cli.YouTube.__init__", return_value=None)
-def test_video_urls(youtube, request_get, playlist_html):
+def test_videos(youtube, request_get, playlist_html):
     url = "https://www.fakeurl.com/playlist?list=whatever"
     request_get.return_value = playlist_html
     playlist = Playlist(url)

tests/test_cli.py

@@ -177,3 +177,13 @@ def test_download_by_resolution(youtube):
     cli.main()
     youtube.assert_called()
     cli.download_by_resolution.assert_called()
+
+
+@mock.patch("pytube.cli.Playlist")
+def test_download_by_resolution(playlist):
+    parser = argparse.ArgumentParser()
+    args = parse_args(parser, ["https://www.youtube.com/playlist?list=PLyn", "-r", "320p"])
+    cli._parse_args = MagicMock(return_value=args)
+    cli.download_by_resolution = MagicMock()
+    cli.main()
+    playlist.assert_called()