Fatal error: Uncaught Error: Class 'PHPUnit\Framework\TestCase' not found in C:\xampp\htdocs\print-bk\vendor\symfony\debug\Tests\Exception\FlattenExceptionTest.php:33 Stack trace: #0 {main} thrown in C:\xampp\htdocs\print-bk\vendor\symfony\debug\Tests\Exception\FlattenExceptionTest.php on line 33