Fatal error: Uncaught Error: Class 'React\Tests\Promise\Timer\TestCase' not found in /var/www/html/stz-api/vendor/react/promise-timer/tests/FunctionTimeoutTest.php:8 Stack trace: #0 {main} thrown in /var/www/html/stz-api/vendor/react/promise-timer/tests/FunctionTimeoutTest.php on line 8