Fatal error: Uncaught Error: Class "PHPUnit\Framework\TestCase" not found in /var/www/html/repo/school-infix-v6.0/vendor/unicodeveloper/laravel-paystack/tests/PaystackTest.php:21 Stack trace: #0 {main} thrown in /var/www/html/repo/school-infix-v6.0/vendor/unicodeveloper/laravel-paystack/tests/PaystackTest.php on line 21