Fatal error: Uncaught Error: Class "PHPUnit\Framework\TestCase" not found in C:\xampp\htdocs\r10ca\vendor\nunomaduro\collision\tests\Unit\Adapters\LaravelTest.php:20 Stack trace: #0 {main} thrown in C:\xampp\htdocs\r10ca\vendor\nunomaduro\collision\tests\Unit\Adapters\LaravelTest.php on line 20