Fatal error: Uncaught Error: Class "PHPUnit\Framework\TestCase" not found in C:\Apache24\htdocs\anteriores\apifac\vendor\laravel\framework\tests\Mail\MailMailableTest.php:18 Stack trace: #0 {main} thrown in C:\Apache24\htdocs\anteriores\apifac\vendor\laravel\framework\tests\Mail\MailMailableTest.php on line 18