Fatal error: Uncaught Error: Class 'OxidEsales\TestingLibrary\UnitTestCase' not found in /www/shop/vendor/oxid-esales/paypal-module/Tests/Integration/Library/IntegrationTestHelper.php:24 Stack trace: #0 {main} thrown in /www/shop/vendor/oxid-esales/paypal-module/Tests/Integration/Library/IntegrationTestHelper.php on line 24