Fatal error: Uncaught Error: Class 'PHPUnit\Framework\TestCase' not found in /www/shop/vendor/oxid-esales/oxideshop-ce/tests/Integration/Internal/ComposerPlugin/ModulePackageInstallerTest.php:24 Stack trace: #0 {main} thrown in /www/shop/vendor/oxid-esales/oxideshop-ce/tests/Integration/Internal/ComposerPlugin/ModulePackageInstallerTest.php on line 24