Fatal error: Uncaught Error: Class 'PHPUnit_Framework_TestCase' not found in /home/szperaczxf/storage_diagnostik/vendor/guzzlehttp/streams/tests/BufferStreamTest.php:6 Stack trace: #0 {main} thrown in /home/szperaczxf/storage_diagnostik/vendor/guzzlehttp/streams/tests/BufferStreamTest.php on line 6