/**
  * @test
  */
 public function xmlSerializeMustAppendShippingData()
 {
     $this->markTestSkipped();
     $xml = simplexml_load_string('<?xml version="1.0" encoding="UTF-8"?><test />');
     $address = $this->getMock('PHPSC\\PagSeguro\\Customer\\Address', [], [], '', false);
     $shipping = new Shipping(Type::TYPE_PAC, $address, '10.31');
     $address->expects($this->once())->method('xmlSerialize')->with($this->isInstanceOf('SimpleXMLElement'));
     $shipping->xmlSerialize($xml);
     $this->assertEquals(1, (string) $xml->shipping->type);
     $this->assertEquals(10.31, (string) $xml->shipping->cost);
 }