Fatal error: Uncaught Error: Class "PHPUnit\Framework\TestCase" not found in /users/energydata/www/volkszaehler.org/vendor/ratchet/rfc6455/tests/unit/Handshake/RequestVerifierTest.php:11 Stack trace: #0 {main} thrown in /users/energydata/www/volkszaehler.org/vendor/ratchet/rfc6455/tests/unit/Handshake/RequestVerifierTest.php on line 11