Fatal error: Uncaught Error: Class 'PHPUnit\Framework\TestCase' not found in /opt/lampp/htdocs/kuesioner/vendor/phpunit/php-timer/tests/TimerTest.php:17 Stack trace: #0 {main} thrown in /opt/lampp/htdocs/kuesioner/vendor/phpunit/php-timer/tests/TimerTest.php on line 17