Fatal error: Uncaught Error: Class "PHPUnit\Framework\TestCase" not found in /opt/lampp/htdocs/myhospitalnow/mhn-hospital-ms/vendorback/phpunit/phpunit-mock-objects/tests/MockObjectTest.php:15 Stack trace: #0 {main} thrown in /opt/lampp/htdocs/myhospitalnow/mhn-hospital-ms/vendorback/phpunit/phpunit-mock-objects/tests/MockObjectTest.php on line 15