Fatal error: Uncaught Error: Class "YouTube\Tests\TestCase" not found in C:\xampp\htdocs\vendor\athlon1600\youtube-downloader\tests\YouTubePageTest.php:7 Stack trace: #0 {main} thrown in C:\xampp\htdocs\vendor\athlon1600\youtube-downloader\tests\YouTubePageTest.php on line 7