Fatal error: Uncaught Error: Class 'OxidEsales\TestingLibrary\UnitTestCase' not found in /www/shop/vendor/oxid-esales/gdpr-optin-module/Tests/Integration/FrontendTest.php:45 Stack trace: #0 {main} thrown in /www/shop/vendor/oxid-esales/gdpr-optin-module/Tests/Integration/FrontendTest.php on line 45