Fatal error: Uncaught Error: Class "PHPUnit\Framework\TestCase" not found in /home/hagi/public_html/virtual/vendor/symfony/mime/Tests/Header/MailboxHeaderTest.php:19 Stack trace: #0 {main} thrown in /home/hagi/public_html/virtual/vendor/symfony/mime/Tests/Header/MailboxHeaderTest.php on line 19