diff --git a/erpnext/manufacturing/doctype/production_order/test_production_order.py b/erpnext/manufacturing/doctype/production_order/test_production_order.py
index db00754..7b6425e 100644
--- a/erpnext/manufacturing/doctype/production_order/test_production_order.py
+++ b/erpnext/manufacturing/doctype/production_order/test_production_order.py
@@ -125,7 +125,17 @@
 			"docstatus": 0
 		})
 		self.assertRaises(OverProductionLoggedError, time_log2.save)
-
+		
+	def test_planned_operating_cost(self):
+		prod_order = make_prod_order_test_record(item="_Test FG Item 2",
+			planned_start_date="2014-11-25 00:00:00", qty=1, do_not_save=True)
+		prod_order.set_production_order_operations()
+		prod_order.save()
+		cost = prod_order.planned_operating_cost
+		prod_order.qty = 2
+		prod_order.save()
+		self.assertEqual(prod_order.planned_operating_cost, cost*2)
+		
 def make_prod_order_test_record(**args):
 	args = frappe._dict(args)