Bluz\Validator\Rule\CountryCode::validate PHP Метод

    public function validate($input) : bool
    {
        return in_array(strtoupper($input), $this->countryCodeList);
    }

 /**
  * @dataProvider providerForFail
  */
 public function testInvalidCountryCodeShouldReturnFalse($input)
 {
     $this->assertFalse($this->validator->validate($input));
 }