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✏️ Editing: PersonTest.php Writable

<?php

namespace Faker\Test\Provider\pt_PT;

use Faker\Provider\pt_PT\Person;
use Faker\Test\TestCase;

/**
 * @group legacy
 */
final class PersonTest extends TestCase
{
    public function testTaxpayerIdentificationNumberIsValid(): void
    {
        $tin = $this->faker->taxpayerIdentificationNumber();
        self::assertTrue(self::isValidTin($tin), $tin);
    }

/**
     * @see http://pt.wikipedia.org/wiki/N%C3%BAmero_de_identifica%C3%A7%C3%A3o_fiscal
     *
     * @param string $tin
     *
     * @return bool
     */
    private static function isValidTin($tin)
    {
        $regex = '(([1,2,3,5,6,8]{1}[0-9]{8})|((45)|(70)|(71)|(72)|(77)|(79)|(90|(98|(99))))[0-9]{7})';

if (null === $tin || !is_numeric($tin) || !strlen($tin) == 9 || preg_match("/$regex/", $tin) !== 1) {
            return false;
        }
        $n = str_split($tin);
        // cd - Control Digit
        $cd = ($n[0] * 9 + $n[1] * 8 + $n[2] * 7 + $n[3] * 6 + $n[4] * 5 + $n[5] * 4 + $n[6] * 3 + $n[7] * 2) % 11;

if ($cd === 0 || $cd === 1) {
            $cd = 0;
        } else {
            $cd = 11 - $cd;
        }

return $cd === (int) $n[8];
    }

protected function getProviders(): iterable
    {
        yield new Person($this->faker);
    }
}

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