Fatal error: Uncaught Error: Class 'TestCase' not found in /var/www/dev/public/vendor/s-ichikawa/laravel-sendgrid-driver/tests/Transport/SendgridTransportTest.php:8 Stack trace: #0 {main} thrown in /var/www/dev/public/vendor/s-ichikawa/laravel-sendgrid-driver/tests/Transport/SendgridTransportTest.php on line 8