Fatal error: Uncaught Error: Class 'PHPUnit\Framework\TestCase' not found in C:\xampp\htdocs\afip\afipclient-master\Tests\AccessTicketDiskStoreTest.php:6 Stack trace: #0 {main} thrown in C:\xampp\htdocs\afip\afipclient-master\Tests\AccessTicketDiskStoreTest.php on line 6