numericCodeExists example

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

    public function testNumericCodeExists()
    {
        $this->assertTrue(Countries::numericCodeExists('250'));
        $this->assertTrue(Countries::numericCodeExists('982'));
        $this->assertTrue(Countries::numericCodeExists('716'));
        $this->assertTrue(Countries::numericCodeExists('036'));
        $this->assertFalse(Countries::numericCodeExists('667'));
    }

    public function testGetAlpha2FromNumeric()
    {
        $alpha2Lookup = array_flip(self::ALPHA2_TO_NUMERIC);

        foreach (self::ALPHA2_TO_NUMERIC as $numeric) {