run(); $this->assertFalse($result->isValid()); } public function testValidVatNumber() { // Usage example $country_code = "AT"; // Ireland $vat_number = "U12345678"; // Example VAT number $result = ''; $vat_checker = new VatNumberCheck($vat_number, $country_code); $result = $vat_checker->run(); $this->assertFalse($result->isValid()); } }