def test_open_orders_by_order_id(self):
stock=Stock(symbol='symbol', description='a stock', ISIN='US123456789', exchange=self.exchange)
order1=BuyOrder(account=self.account, security=stock, price=13.2, share=10)
order2=BuyOrder(account=self.account, security=stock, price=13.25, share=10)
self.session.add(order1)
self.session.add(order2)
self.session.commit()
tc=TradingCenter(self.session)
order=tc.open_order_by_id(order1.id)
self.assertEquals(order1, order)
order=tc.open_order_by_id(100)
self.assertEquals(None, order)
