Fatal error: Uncaught Error: Class 'PHPUnit\Framework\TestCase' not found in G:\projects\beta.api.edutalk.edu.vn\vendor\laravel\lumen-framework\src\Testing\TestCase.php:12 Stack trace: #0 {main} thrown in G:\projects\beta.api.edutalk.edu.vn\vendor\laravel\lumen-framework\src\Testing\TestCase.php on line 12