Fatal error: Uncaught Error: Class "PHPUnit\Framework\TestCase" not found in /home/trairtil/public_html/vendor/symfony/mime/Tests/Encoder/Base64MimeHeaderEncoderTest.php:17 Stack trace: #0 {main} thrown in /home/trairtil/public_html/vendor/symfony/mime/Tests/Encoder/Base64MimeHeaderEncoderTest.php on line 17