Fatal error: Uncaught Error: Class "PHPUnit\Framework\TestCase" not found in /var/www/usonboard.com/vendor/guzzlehttp/promises/tests/UtilsTest.php:17
Stack trace:
#0 {main}
thrown in /var/www/usonboard.com/vendor/guzzlehttp/promises/tests/UtilsTest.php on line 17