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