Fatal error: Uncaught Error: Class 'PHPUnit\Framework\TestCase' not found in C:\Web\htdocs\vendor-copia\maennchen\zipstream-php\test\BigintTest.php:10 Stack trace: #0 {main} thrown in C:\Web\htdocs\vendor-copia\maennchen\zipstream-php\test\BigintTest.php on line 10