Fatal error: Uncaught Error: Class "PHPUnit\Framework\TestCase" not found in /var/www/html/src/vendor/num-num/ubl-invoice/tests/Read/DespatchDocumentReferenceTest.php:9 Stack trace: #0 {main} thrown in /var/www/html/src/vendor/num-num/ubl-invoice/tests/Read/DespatchDocumentReferenceTest.php on line 9