Fatal error: Uncaught Error: Class "PHPUnit\Framework\TestCase" not found in /home/dario/Servidor/Sipemu/vendor/webklex/php-imap/tests/InitialTest.php:16 Stack trace: #0 {main} thrown in /home/dario/Servidor/Sipemu/vendor/webklex/php-imap/tests/InitialTest.php on line 16