Fatal error: Uncaught Error: Class 'PHPUnit\Framework\TestCase' not found in C:\xampp\htdocs\lara_passport\vendor\sebastian\diff\tests\Exception\InvalidArgumentExceptionTest.php:18 Stack trace: #0 {main} thrown in C:\xampp\htdocs\lara_passport\vendor\sebastian\diff\tests\Exception\InvalidArgumentExceptionTest.php on line 18