Fatal error: Uncaught Error: Class "PHPUnit\Framework\TestCase" not found in /var/www/html/repo/invoicing-salepropos/vendor/gladcodes/keygen/tests/Keygen/GeneratorTest.php:11 Stack trace: #0 {main} thrown in /var/www/html/repo/invoicing-salepropos/vendor/gladcodes/keygen/tests/Keygen/GeneratorTest.php on line 11