Alaouy\Youtube\Youtube::getPlaylistById PHP Method

    public function getPlaylistById($id, $part = ['id', 'snippet', 'status'])
    {
        $API_URL = $this->getApi('playlists.list');
        $params = array('id' => $id, 'part' => implode(', ', $part));
        $apiData = $this->api_get($API_URL, $params);
        return $this->decodeSingle($apiData);
    }

 public function testGetPlaylistById()
 {
     //get one of the playlist
     $GOOGLE_CHANNELID = 'UCK8sQmJBp8GCxrOtXWBpyEA';
     $response = $this->youtube->getPlaylistsByChannelId($GOOGLE_CHANNELID);
     $playlist = $response[0];
     $response = $this->youtube->getPlaylistById($playlist->id);
     $this->assertEquals('youtube#playlist', $response->kind);
 }