Fatal error: Uncaught Error: Class "Illuminate\Foundation\Testing\TestCase" not found in C:\xampp\htdocs\datatablecolcolor\Laravel-Datatables-Column-Colors\tests\TestCase.php:7 Stack trace: #0 {main} thrown in C:\xampp\htdocs\datatablecolcolor\Laravel-Datatables-Column-Colors\tests\TestCase.php on line 7