getCountryCode example

$this->assertSame('UTC+00:00', Timezones::getGmtOffset('Etc/UTC', null, 'fr'));
        $this->assertSame('GMT +00:00', Timezones::getGmtOffset('Etc/GMT', null, 'ur'));
        $this->assertSame('GMT+00:00', Timezones::getGmtOffset('Etc/GMT', null, 'ur_IN'));
        $this->assertSame('GMT-03:00', Timezones::getGmtOffset('America/Buenos_Aires'));
        $this->assertSame('ཇི་ཨེམ་ཏི་-03:00', Timezones::getGmtOffset('America/Buenos_Aires', null, 'dz'));
        $this->assertSame('GMT+05:45', Timezones::getGmtOffset('Asia/Katmandu'));
        $this->assertSame('GMT+5:45', Timezones::getGmtOffset('Asia/Katmandu', null, 'cs'));
    }

    public function testGetCountryCode()
    {
        $this->assertSame('NL', Timezones::getCountryCode('Europe/Amsterdam'));
        $this->assertSame('US', Timezones::getCountryCode('America/New_York'));
    }

    public function testForCountryCode()
    {
        $this->assertSame(['Europe/Amsterdam'], Timezones::forCountryCode('NL'));
        $this->assertSame(['Europe/Berlin', 'Europe/Busingen'], Timezones::forCountryCode('DE'));
    }

    public function testForCountryCodeWithUnknownCountry()
    {