Fatal error: Uncaught Error: Class "PHPUnit\Framework\TestCase" not found in C:\xampp\htdocs\r10csm\vendor\symfony\event-dispatcher\Tests\Debug\WrappedListenerTest.php:20 Stack trace: #0 {main} thrown in C:\xampp\htdocs\r10csm\vendor\symfony\event-dispatcher\Tests\Debug\WrappedListenerTest.php on line 20