Fatal error: Uncaught Error: Class 'PHPUnit\Framework\TestCase' not found in C:\xampp\htdocs\print\vendor\symfony\event-dispatcher\Tests\Debug\TraceableEventDispatcherTest.php:22 Stack trace: #0 {main} thrown in C:\xampp\htdocs\print\vendor\symfony\event-dispatcher\Tests\Debug\TraceableEventDispatcherTest.php on line 22