Fatal error: Uncaught ReflectionException: Class "PHPUnit\Framework\TestCase" does not exist in /var/www/html/vendor/symfony/form/Test/Traits/RunTestTrait.php:16 Stack trace: #0 /var/www/html/vendor/symfony/form/Test/Traits/RunTestTrait.php(16): ReflectionMethod->__construct() #1 {main} thrown in /var/www/html/vendor/symfony/form/Test/Traits/RunTestTrait.php on line 16