Fatal error: Uncaught Error: Class 'PHPUnit\Framework\TestCase' not found in /home/wwiwil/apps/iwill-laravel/vendor/league/oauth1-client/tests/TwitterServerTest.php:9 Stack trace: #0 {main} thrown in /home/wwiwil/apps/iwill-laravel/vendor/league/oauth1-client/tests/TwitterServerTest.php on line 9