Fatal error: Uncaught Error: Class 'PHPUnit\Framework\TestCase' not found in /home/app/htdocs/message_gateway/vendor/aranyasen/hl7/tests/TestCase.php:7 Stack trace: #0 {main} thrown in /home/app/htdocs/message_gateway/vendor/aranyasen/hl7/tests/TestCase.php on line 7