s_packaging_calculator: improve test util

This way no matter who's changing the behavior of the name getter
we'll get the right name.

stock_packaging_calculator/tests/utils.py

@@ -5,6 +5,7 @@
 def make_pkg_values(record, **kw):
     """Helper to generate test values for packaging.
     """
+    name = record.name
     if record._name == "uom.uom":
         is_unit = True
         barcode = None
@@ -13,9 +14,11 @@ def make_pkg_values(record, **kw):
         qty = record.qty
         is_unit = False
         barcode = record.barcode
+        if record.product_id:
+            name = record.product_id._packaging_name_getter(record)
     values = {
         "id": record.id,
-        "name": record.name,
+        "name": name,
         "qty": qty,
         "barcode": barcode,
         "is_unit": is_unit,