Fatal error: Uncaught Error: Class "Yoast\PHPUnitPolyfills\TestCases\TestCase" not found in /var/www/html/vendor/jumbojett/openid-connect-php/tests/OpenIDConnectClientTest.php:8 Stack trace: #0 {main} thrown in /var/www/html/vendor/jumbojett/openid-connect-php/tests/OpenIDConnectClientTest.php on line 8