Fatal error: Uncaught Error: Class "PHPUnit\Framework\TestCase" not found in /home/shooubadvance/public_html/it.shooubadvance.com/vendor/guzzlehttp/promises/tests/PromiseTest.php:18 Stack trace: #0 {main} thrown in /home/shooubadvance/public_html/it.shooubadvance.com/vendor/guzzlehttp/promises/tests/PromiseTest.php on line 18