Fatal error: Uncaught Error: Class 'PHPUnit\Framework\TestCase' not found in C:\xampp\htdocs\tests\unit\Composer\Write\Coil\WriteCoilRequestTest.php:12 Stack trace: #0 {main} thrown in C:\xampp\htdocs\tests\unit\Composer\Write\Coil\WriteCoilRequestTest.php on line 12