Fatal error: Uncaught Error: Class "PHPUnit\Framework\TestCase" not found in /var/www/html/repo/school-infix-v6.0/vendor/unicodeveloper/laravel-paystack/tests/HelpersTest.php:8 Stack trace: #0 {main} thrown in /var/www/html/repo/school-infix-v6.0/vendor/unicodeveloper/laravel-paystack/tests/HelpersTest.php on line 8