Fatal error: Uncaught Error: Class 'PHPUnit\Framework\TestCase' not found in C:\xampp73\htdocs\web\vendor\asm89\stack-cors\tests\CorsTest.php:20 Stack trace: #0 {main} thrown in C:\xampp73\htdocs\web\vendor\asm89\stack-cors\tests\CorsTest.php on line 20