Fatal error: Uncaught Error: Class 'PHPUnit\Framework\TestCase' not found in /home/demoinvfsanz/public_html/vendor/laravel/framework/tests/Mail/MailMessageTest.php:9 Stack trace: #0 {main} thrown in /home/demoinvfsanz/public_html/vendor/laravel/framework/tests/Mail/MailMessageTest.php on line 9