Fatal error: Uncaught Error: Class 'PHPUnit\Framework\TestCase' not found in C:\Apache24\htdocs\InvoiceTracking\vendor\symfony\validator\Test\ConstraintValidatorTestCase.php:40 Stack trace: #0 {main} thrown in C:\Apache24\htdocs\InvoiceTracking\vendor\symfony\validator\Test\ConstraintValidatorTestCase.php on line 40