Fatal error: Uncaught Error: Class "PHPUnit\Framework\TestCase" not found in /home/crmcodingobjects/public_html/modules/MailClient/Tests/Unit/FolderIdentifierTest.php:18 Stack trace: #0 {main} thrown in /home/crmcodingobjects/public_html/modules/MailClient/Tests/Unit/FolderIdentifierTest.php on line 18