Fatal error: Uncaught Error: Class "PHPUnit\Framework\TestCase" not found in /home/ywbshareacopy/public_html/vendor/acquia/http-hmac-php/test/ResponseAuthenticatorTest.php:18 Stack trace: #0 {main} thrown in /home/ywbshareacopy/public_html/vendor/acquia/http-hmac-php/test/ResponseAuthenticatorTest.php on line 18