Fatal error: Uncaught Error: Class 'PHPUnit\Framework\TestCase' not found in /home/esecureh/public_html/magdemo/vendor/magento/module-inventory-in-store-pickup-sales/Test/Integration/Extension/OrderExtensionTest.php:21 Stack trace: #0 {main} thrown in /home/esecureh/public_html/magdemo/vendor/magento/module-inventory-in-store-pickup-sales/Test/Integration/Extension/OrderExtensionTest.php on line 21