Fatal error: Uncaught Error: Class "PHPUnit\Framework\TestCase" not found in /home/oyaagyug/public_html/vendor/league/oauth1-client/tests/RsaClientCredentialsTest.php:10 Stack trace: #0 {main} thrown in /home/oyaagyug/public_html/vendor/league/oauth1-client/tests/RsaClientCredentialsTest.php on line 10