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