Fatal error: Uncaught Error: Class 'PHPUnit\Framework\TestCase' not found in /home/app/htdocs/message_gateway/vendor/sebastian/code-unit-reverse-lookup/tests/WizardTest.php:18 Stack trace: #0 {main} thrown in /home/app/htdocs/message_gateway/vendor/sebastian/code-unit-reverse-lookup/tests/WizardTest.php on line 18