Fatal error: Uncaught Error: Class 'PHPUnit\Framework\TestCase' not found in C:\xampp73\htdocs\MonitoresCIE_C\vendor\phar-io\manifest\tests\values\EmailTest.php:18 Stack trace: #0 {main} thrown in C:\xampp73\htdocs\MonitoresCIE_C\vendor\phar-io\manifest\tests\values\EmailTest.php on line 18