Fatal error: Uncaught Error: Class "PHPUnit_Framework_TestCase" not found in /var/www/illumine/vendor/sabre/xml/tests/Sabre/Xml/ContextStackTest.php:12 Stack trace: #0 {main} thrown in /var/www/illumine/vendor/sabre/xml/tests/Sabre/Xml/ContextStackTest.php on line 12