public function testSerializationDeserialization()
{
$obj = new ItemList(self::getJson());
$this->assertNotNull($obj);
$this->assertNotNull($obj->getItems());
$this->assertNotNull($obj->getShippingAddress());
$this->assertNotNull($obj->getShippingMethod());
$this->assertNotNull($obj->getShippingPhoneNumber());
$this->assertEquals(self::getJson(), $obj->toJson());
return $obj;
}