Fatal error: Uncaught Error: Class 'Tests\TestCase' not found in /home/nextgenc/shieldlink.app/inventory/tests/Feature/Notifications/Webhooks/SlackNotificationsUponCheckoutTest.php:24 Stack trace: #0 {main} thrown in /home/nextgenc/shieldlink.app/inventory/tests/Feature/Notifications/Webhooks/SlackNotificationsUponCheckoutTest.php on line 24