Fatal error: Uncaught Error: Class 'PHPUnit\Framework\TestCase' not found in /home/clienti2020/public_html/novaballet.it/vendor/swiftmailer/swiftmailer/tests/unit/Swift/Signers/SMimeSignerTest.php:3 Stack trace: #0 {main} thrown in /home/clienti2020/public_html/novaballet.it/vendor/swiftmailer/swiftmailer/tests/unit/Swift/Signers/SMimeSignerTest.php on line 3