Fatal error: Uncaught Error: Class "Tests\TestCase" not found in C:\xampp\htdocs\kotsch.tech\kotsch-tech\tests\Feature\Shop\PayPalSecurityTest.php:19 Stack trace: #0 {main} thrown in C:\xampp\htdocs\kotsch.tech\kotsch-tech\tests\Feature\Shop\PayPalSecurityTest.php on line 19