Fatal error: Uncaught Error: Class "PHPUnit\Framework\TestCase" not found in /home/demohost/hospital.demohost.in/vendor/opcodesio/mail-parser/tests/TestCase.php:7 Stack trace: #0 {main} thrown in /home/demohost/hospital.demohost.in/vendor/opcodesio/mail-parser/tests/TestCase.php on line 7