Fill warehouse locations in stock_shipment_measurements tests

Since 6efb7bc9d60f the warehouse locations are required but they are not
filled in unit test because on_change's are not called.

Closes #12045

modules/stock_shipment_measurements/tests/test_module.py

@@ -154,6 +154,8 @@ class StockShipmentMeasurementsTestCase(CompanyTestMixin, ModuleTestCase):
             shipment = Shipment()
             shipment.customer = party
             shipment.delivery_address, = party.addresses
+            shipment.warehouse = Shipment.default_warehouse()
+            shipment.on_change_warehouse()
             shipment.save()
 
             # without moves