Fatal error: Uncaught Error: Class 'PHPUnit\Framework\TestCase' not found in /www/shop/vendor/oxid-esales/oxideshop-demodata-installer/tests/Integration/DemoDataInstallerTest.php:34 Stack trace: #0 {main} thrown in /www/shop/vendor/oxid-esales/oxideshop-demodata-installer/tests/Integration/DemoDataInstallerTest.php on line 34