Fatal error: Uncaught Error: Class 'PHPUnit\Framework\TestCase' not found in /opt/lampp/htdocs/us/vendor/simplesoftwareio/simple-qrcode/tests/ImageTest.php:6 Stack trace: #0 {main} thrown in /opt/lampp/htdocs/us/vendor/simplesoftwareio/simple-qrcode/tests/ImageTest.php on line 6