Fatal error: Uncaught Error: Class "PHPUnit\Framework\TestCase" not found in D:\programs\xampp\htdocs\laravel-blog-api\vendor\symfony\service-contracts\Test\ServiceLocatorTestCase.php:20 Stack trace: #0 {main} thrown in D:\programs\xampp\htdocs\laravel-blog-api\vendor\symfony\service-contracts\Test\ServiceLocatorTestCase.php on line 20