Fatal error: Uncaught Error: Class 'PHPUnit\Framework\TestCase' not found in /home/noct-c/www/tanakahashi/vendor/symfony/mime/Tests/MessageConverterTest.php:19
Stack trace:
#0 {main}
thrown in /home/noct-c/www/tanakahashi/vendor/symfony/mime/Tests/MessageConverterTest.php on line 19