Fatal error: Uncaught Error: Class "PHPUnit\Framework\TestCase" not found in C:\xampp\htdocs\snipe-it\vendor\php-mock\php-mock-integration\tests\MockDelegateFunctionTest.php:15 Stack trace: #0 {main} thrown in C:\xampp\htdocs\snipe-it\vendor\php-mock\php-mock-integration\tests\MockDelegateFunctionTest.php on line 15