Fatal error: Uncaught Error: Class "PHPUnit\Framework\TestCase" not found in C:\xampp\htdocs\astra-backoffice\vendor\brick\math\tests\CalculatorDetectTest.php:14 Stack trace: #0 {main} thrown in C:\xampp\htdocs\astra-backoffice\vendor\brick\math\tests\CalculatorDetectTest.php on line 14