Fatal error: Uncaught Error: Class 'PHPUnit\Framework\TestCase' not found in /home/wwiwil/apps/iwill-laravel/vendor/league/oauth1-client/tests/RsaSha1SignatureTest.php:11 Stack trace: #0 {main} thrown in /home/wwiwil/apps/iwill-laravel/vendor/league/oauth1-client/tests/RsaSha1SignatureTest.php on line 11