Fatal error: Uncaught Error: Class "PHPUnit\Framework\TestCase" not found in C:\xampp\htdocs\r10ca\vendor\laravel\framework\tests\Validation\ValidationValidatorTest.php:40 Stack trace: #0 {main} thrown in C:\xampp\htdocs\r10ca\vendor\laravel\framework\tests\Validation\ValidationValidatorTest.php on line 40