Fatal error: Uncaught Error: Class "PHPUnit\Framework\TestCase" not found in /var/www/html/vendor/mike42/gfx-php/test/integration/BmpsuiteTest.php:9 Stack trace: #0 {main} thrown in /var/www/html/vendor/mike42/gfx-php/test/integration/BmpsuiteTest.php on line 9