Fatal error: Uncaught Error: Class 'PHPUnit\Framework\TestCase' not found in C:\Landaweb\webs\servernuevo\vendor\sendgrid\php-http-client\test\unit\FilesExistTest.php:7 Stack trace: #0 {main} thrown in C:\Landaweb\webs\servernuevo\vendor\sendgrid\php-http-client\test\unit\FilesExistTest.php on line 7