Fatal error: Uncaught Error: Class 'PHPUnit\Framework\TestCase' not found in /home/vsajaipu/public_html/laravel/vendor/swiftmailer/swiftmailer/tests/SwiftMailerTestCase.php:10 Stack trace: #0 {main} thrown in /home/vsajaipu/public_html/laravel/vendor/swiftmailer/swiftmailer/tests/SwiftMailerTestCase.php on line 10