Set product on invoice line with cost method 'shipment'

issue5196
review19711002

stock.py

@@ -89,6 +89,7 @@ class ShipmentOut:
         invoice_line = InvoiceLine()
         product = self.carrier.carrier_product
         invoice_line.type = 'line'
+        invoice_line.product = product
 
         party = invoice.party
         party_context = {}

tests/scenario_sale_shipment_cost.rst

@@ -176,6 +176,9 @@ Check customer invoice::
 
     >>> sale.reload()
     >>> invoice, = sale.invoices
+    >>> sorted([l.product for l in invoice.lines]) == \
+    ...     sorted([product, carrier_product])
+    True
     >>> invoice.untaxed_amount
     Decimal('83.00')