Set account_stock_method to account_stock scenarios

tests/scenario_purchase_shipment_cost_with_account_stock.rst

@@ -69,6 +69,7 @@ Create fiscal year::
     >>> fiscalyear.start_date = today + relativedelta(month=1, day=1)
     >>> fiscalyear.end_date = today + relativedelta(month=12, day=31)
     >>> fiscalyear.company = company
+    >>> fiscalyear.account_stock_method = 'continental'
     >>> post_move_sequence = Sequence(name='%s' % today.year,
     ...     code='account.move',
     ...     company=company)

tests/scenario_purchase_shipment_cost_with_account_stock_anglo_saxon.rst

@@ -81,6 +81,7 @@ Create fiscal year::
     >>> fiscalyear.start_date = today + relativedelta(month=1, day=1)
     >>> fiscalyear.end_date = today + relativedelta(month=12, day=31)
     >>> fiscalyear.company = company
+    >>> fiscalyear.account_stock_method = 'anglo_saxon'
     >>> post_move_sequence = Sequence(name='%s' % today.year,
     ...     code='account.move',
     ...     company=company)