Fatal error: Uncaught Error: Class "PHPUnit\Framework\TestCase" not found in /var/www/usonboard.com/vendor/guzzlehttp/psr7/tests/StreamTest.php:15
Stack trace:
#0 {main}
thrown in /var/www/usonboard.com/vendor/guzzlehttp/psr7/tests/StreamTest.php on line 15