Fatal error: Uncaught Error: Class "PHPUnit_Framework_TestCase" not found in /users/energydata/www/volkszaehler.org/vendor/ringcentral/psr7/tests/AppendStreamTest.php:7 Stack trace: #0 {main} thrown in /users/energydata/www/volkszaehler.org/vendor/ringcentral/psr7/tests/AppendStreamTest.php on line 7