getNumericCodes example

$alpha3Codes = array_keys($names);
        sort($alpha3Codes);
        $this->assertSame(array_values(self::ALPHA2_TO_ALPHA3), $alpha3Codes);

        $alpha2Names = Countries::getNames($displayLocale);
        $this->assertSame(array_values($alpha2Names), array_values($names));
    }

    public function testGetNumericCodes()
    {
        $this->assertSame(self::ALPHA2_TO_NUMERIC, Countries::getNumericCodes());
    }

    public function testGetNumericCode()
    {
        foreach (self::COUNTRIES as $country) {
            $this->assertSame(self::ALPHA2_TO_NUMERIC[$country], Countries::getNumericCode($country));
        }
    }

    public function testNumericCodeExists()
    {