public function testGetSellToAddressWithBillingAddress()
    {
        $xml = new SimpleXMLElement('<Order><BillingData><Address><City>City1</City></Address></BillingData><FulfillmentData><Address><City>City2</City></Address></FulfillmentData></Order>');
        $result = $this->xmlReader->getSellToAddress($xml);
        $this->assertInstanceOf(SimpleXMLElement::class, $result);
        $this->assertSame('City1', (string)$result->City);
    }

    public function testGetSellToAddressWithFulfillmentAddress()
    {
        $xml = new SimpleXMLElement('<Order><BillingData><Address><City>City1</City></Address></BillingData><FulfillmentData><Address><City>City2</City></Address></FulfillmentData></Order>');
        $result = $this->xmlReader->getSellToAddress($xml);
        $this->assertInstanceOf(SimpleXMLElement::class, $result);
        $this->assertSame('City1', (string)$result->City);
    }

    public function testGetSellToAddressWithDifferentAddresses()
    {
        $xml = new SimpleXMLElement('<Order><BillingData><Address><City>City1</City></Address></BillingData><FulfillmentData><Address><City>City2</City></Address></FulfillmentData></Order>');
        $result = $this->xmlReader->getSellToAddress($xml);
        $this->assertInstanceOf(SimpleXMLElement::class, $result);
        $this->assertSame('City1', (string)$result->City);
    }

    public function testGetShipToAddressWithFulfillmentAddress()
    {
        $xml = new SimpleXMLElement('<Order><FulfillmentData><Address><City>City</City></Address></FulfillmentData></Order>');
        $result = $this->xmlReader->getShipToAddress($xml);
        $this->assertInstanceOf(SimpleXMLElement::class, $result);
        $this->assertSame('City', (string)$result->City);
    }

    public function testGetShipToAddressWithoutFulfillmentAddress()
    {
        $xml = new SimpleXMLElement('<Order></Order>');
        $result = $this->xmlReader->getShipToAddress($xml);
        $this->assertNull($result);
    }

    public function testGetStateOrRegionWithState()
    {
        $xml = new SimpleXMLElement('<Address><StateOrRegion>CA</StateOrRegion></Address>');
        $result = $this->xmlReader->getStateOrRegion($xml);
        $this->assertSame('CA', $result);
    }

    public function testGetStateOrRegionWithoutState()
    {
        $xml = new SimpleXMLElement('<Address></Address>');
        $result = $this->xmlReader->getStateOrRegion($xml);
        $this->assertSame('', $result);
    }