Fatal error: Uncaught Error: Class 'PHPUnit\Framework\Constraint\Constraint' not found in /Users/caiosilva/Sites/Laravel-test/vendor/symfony/mime/Test/Constraint/EmailHtmlBodyContains.php:18 Stack trace: #0 {main} thrown in /Users/caiosilva/Sites/Laravel-test/vendor/symfony/mime/Test/Constraint/EmailHtmlBodyContains.php on line 18