Fatal error: Uncaught Error: Class "PHPUnit\Framework\TestCase" not found in /home/mydemotec/public_html/rms/vendor/webklex/php-imap/tests/ClientManagerTest.php:21 Stack trace: #0 {main} thrown in /home/mydemotec/public_html/rms/vendor/webklex/php-imap/tests/ClientManagerTest.php on line 21