| PASS Must have a .shippingOption IDL attribute. | |
| PASS .shippingOption attribute must default to null. | |
| PASS If there is a single shipping option, but selected is false, then .shippingOption must be null. | |
| PASS If there are multiple shipping options all with `selected` set to false, then .shippingOption is null. | |
| PASS Given multiple shipping options, it must use the selected shipping option for .shippingOption value. | |
| PASS If there are multiple of the shipping options with selected true, then .shippingOption is the last selected shipping option in order. | |