Fatal error: Uncaught Error: Class "PHPUnit\Framework\TestCase" not found in /home/capacita/public_html/aula.certificateperu.com/vendor/php-xapi/serializer/tests/SerializerTest.php:16 Stack trace: #0 {main} thrown in /home/capacita/public_html/aula.certificateperu.com/vendor/php-xapi/serializer/tests/SerializerTest.php on line 16