Fatal error: Uncaught Error: Class 'PHPUnit\Framework\TestCase' not found in /home/changeco/public_html/vendor/psy/psysh/test/Command/ThrowUpCommandTest.php:18 Stack trace: #0 {main} thrown in /home/changeco/public_html/vendor/psy/psysh/test/Command/ThrowUpCommandTest.php on line 18