Fatal error: Uncaught Error: Class 'PHPUnit\Framework\TestCase' not found in /home/app/htdocs/lidia/vendor/paragonie/constant_time_encoding/tests/Base64UrlSafeTest.php:9 Stack trace: #0 {main} thrown in /home/app/htdocs/lidia/vendor/paragonie/constant_time_encoding/tests/Base64UrlSafeTest.php on line 9