Fatal error: Uncaught Error: Class 'PHPUnit\Framework\TestCase' not found in /var/www/typo3/vendor/typo3/cms-composer-installers/tests/TestCase.php:25
Stack trace:
#0 {main}
thrown in /var/www/typo3/vendor/typo3/cms-composer-installers/tests/TestCase.php on line 25