Fatal error: Uncaught Error: Class 'PHPUnit\Framework\TestCase' not found in /home/app/htdocs/lidia/vendor/paragonie/constant_time_encoding/tests/HexTest.php:4 Stack trace: #0 {main} thrown in /home/app/htdocs/lidia/vendor/paragonie/constant_time_encoding/tests/HexTest.php on line 4