Fatal error: Uncaught Error: Class "PHPUnit\Framework\TestCase" not found in /home/systemdecorcom/public_html/sg/vendor/tecnickcom/tc-lib-color/test/Model/GrayTest.php:31 Stack trace: #0 {main} thrown in /home/systemdecorcom/public_html/sg/vendor/tecnickcom/tc-lib-color/test/Model/GrayTest.php on line 31