Fatal error: Uncaught Error: Class 'PHPUnit\Framework\TestCase' not found in /home/esecureh/public_html/magdemo/vendor/magento/module-offline-payments/Test/Unit/Observer/BeforeOrderPaymentSaveObserverTest.php:25 Stack trace: #0 {main} thrown in /home/esecureh/public_html/magdemo/vendor/magento/module-offline-payments/Test/Unit/Observer/BeforeOrderPaymentSaveObserverTest.php on line 25