Fatal error: Uncaught Error: Class 'OxidTestCase' not found in /www/shop/vendor/payone-gmbh/oxid-6/tests/unit/fcPayOne/application/controllers/fcpayoneiframeTest.php:22 Stack trace: #0 {main} thrown in /www/shop/vendor/payone-gmbh/oxid-6/tests/unit/fcPayOne/application/controllers/fcpayoneiframeTest.php on line 22