Fatal error: Uncaught Error: Class 'PHPUnit\Framework\TestCase' not found in /var/www/typo3/vendor/helhum/config-loader/tests/Unit/Reader/NestedConfigReaderTest.php:17 Stack trace: #0 {main} thrown in /var/www/typo3/vendor/helhum/config-loader/tests/Unit/Reader/NestedConfigReaderTest.php on line 17