Fatal error: Uncaught Error: Class "PHPUnit\Framework\TestCase" not found in E:\xampp\htdocs\stms\vendor\simplesoftwareio\simple-qrcode\tests\DataTypes\EmailTest.php:6 Stack trace: #0 {main} thrown in E:\xampp\htdocs\stms\vendor\simplesoftwareio\simple-qrcode\tests\DataTypes\EmailTest.php on line 6