Fatal error: Uncaught Error: Class "PHPUnit\Framework\TestCase" not found in /home/busines5/public_html/mailer.businessbrandagency.com/vendor/apimatic/jsonmapper/tests/namespacetest/NamespaceTest.php:21 Stack trace: #0 {main} thrown in /home/busines5/public_html/mailer.businessbrandagency.com/vendor/apimatic/jsonmapper/tests/namespacetest/NamespaceTest.php on line 21