Fatal error: Uncaught Error: Class "PHPUnit_Framework_TestCase" not found in /users/energydata/www/volkszaehler.org/vendor/ringcentral/psr7/tests/BufferStreamTest.php:6 Stack trace: #0 {main} thrown in /users/energydata/www/volkszaehler.org/vendor/ringcentral/psr7/tests/BufferStreamTest.php on line 6