Fatal error: Uncaught Error: Class "Tests\TestCase" not found in C:\xampp\htdocs\new_saas\backend\tests\Feature\Messaging\MessagingVariablesApiTest.php:22 Stack trace: #0 {main} thrown in C:\xampp\htdocs\new_saas\backend\tests\Feature\Messaging\MessagingVariablesApiTest.php on line 22