Fatal error: Uncaught Error: Class "PHPUnit_Framework_TestCase" not found in /var/www/html/w/vendor/onoi/callback-container/tests/phpunit/Unit/CallbackContainerFactoryTest.php:16 Stack trace: #0 {main} thrown in /var/www/html/w/vendor/onoi/callback-container/tests/phpunit/Unit/CallbackContainerFactoryTest.php on line 16