DragonBe\Vies\Vies::validateVatSum PHP Method

    public function validateVatSum($countryCode, $vatNumber)
    {
        $className = __NAMESPACE__ . '\\Validator\\Validator' . $countryCode;
        /** @var Validator\ValidatorInterface $instance */
        $instance = new $className();
        $vatNumber = self::filterVat($vatNumber);
        return $instance->validate($vatNumber);
    }

 public function testVatNumberChecksumFailure()
 {
     $vies = new Vies();
     foreach ($this->vatNumberProvider() as $country => $numbers) {
         foreach ($numbers[1] as $number) {
             $result = $vies->validateVatSum($country, $number);
             $this->assertFalse($result);
         }
     }
 }