Fatal error: Uncaught Error: Class 'PHPUnit\Framework\TestCase' not found in /home/app3/public_html/service/vendor/guzzlehttp/psr7/tests/BufferStreamTest.php:10 Stack trace: #0 {main} thrown in /home/app3/public_html/service/vendor/guzzlehttp/psr7/tests/BufferStreamTest.php on line 10