Fatal error: Uncaught Error: Class "PHPUnit\Framework\TestCase" not found in C:\xampp\htdocs\astra-backoffice\vendor\egulias\email-validator\tests\EmailValidator\Validation\MultipleValidationWithAndTest.php:18 Stack trace: #0 {main} thrown in C:\xampp\htdocs\astra-backoffice\vendor\egulias\email-validator\tests\EmailValidator\Validation\MultipleValidationWithAndTest.php on line 18