Fatal error: Uncaught Error: Class "Tests\TestCase" not found in C:\xampp\htdocs\datatablecolcolor\Laravel-Datatables-Column-Colors\tests\Unit\ExampleTest.php:8 Stack trace: #0 {main} thrown in C:\xampp\htdocs\datatablecolcolor\Laravel-Datatables-Column-Colors\tests\Unit\ExampleTest.php on line 8