Fatal error: Uncaught Error: Class 'PHPUnit\Framework\TestCase' not found in /home/ultraunlock/public_html/PayPal-PHP-SDK/tests/PayPal/Test/Core/PayPalCredentialManagerTest.php:10 Stack trace: #0 {main} thrown in /home/ultraunlock/public_html/PayPal-PHP-SDK/tests/PayPal/Test/Core/PayPalCredentialManagerTest.php on line 10