Fatal error: Uncaught Error: Class 'PHPUnit\Framework\TestCase' not found in D:\xampp\htdocs\psp\backend\vendor\maennchen\zipstream-php\test\BigintTest.php:11 Stack trace: #0 {main} thrown in D:\xampp\htdocs\psp\backend\vendor\maennchen\zipstream-php\test\BigintTest.php on line 11