Fatal error: Uncaught Error: Class "PHPUnit\Framework\TestCase" not found in /home/khademni/public_html/vendor/org_heigl/ghostscript/tests/Device/PngTest.php:40 Stack trace: #0 {main} thrown in /home/khademni/public_html/vendor/org_heigl/ghostscript/tests/Device/PngTest.php on line 40