Fatal error: Uncaught Error: Class 'PHPUnit\Framework\TestCase' not found in /www/shop/vendor/oxid-esales/oxideshop-ce/tests/Unit/Internal/Domain/Email/EmailValidatorServiceTest.php:20 Stack trace: #0 {main} thrown in /www/shop/vendor/oxid-esales/oxideshop-ce/tests/Unit/Internal/Domain/Email/EmailValidatorServiceTest.php on line 20