Fatal error: Uncaught Error: Class 'PHPUnit\Framework\TestCase' not found in /var/www/typo3/vendor/helhum/config-loader/tests/Unit/ConfigurationLoaderTest.php:20 Stack trace: #0 {main} thrown in /var/www/typo3/vendor/helhum/config-loader/tests/Unit/ConfigurationLoaderTest.php on line 20