Fatal error: Uncaught Error: Class 'PHPUnit\Framework\TestCase' not found in /home/clienti2020/public_html/novaballet.it/vendor/swiftmailer/swiftmailer/tests/unit/Swift/Mime/Headers/IdentificationHeaderTest.php:5 Stack trace: #0 {main} thrown in /home/clienti2020/public_html/novaballet.it/vendor/swiftmailer/swiftmailer/tests/unit/Swift/Mime/Headers/IdentificationHeaderTest.php on line 5