Fatal error: Uncaught Error: Class 'PHPUnit_Framework_TestCase' not found in E:\xampp\htdocs\api.blank_fe\vendor\sebastian\exporter\tests\ExporterTest.php:16 Stack trace: #0 {main} thrown in E:\xampp\htdocs\api.blank_fe\vendor\sebastian\exporter\tests\ExporterTest.php on line 16