def test_derive(self):
takeoff_fuel = TakeoffFuel()
takeoff_fuel.set_flight_attr = Mock()
# Only 'AFR Takeoff Fuel' dependency.
afr_takeoff_fuel = A('AFR Takeoff Fuel', value=100)
takeoff_fuel.derive(afr_takeoff_fuel, None)
takeoff_fuel.set_flight_attr.assert_called_once_with(100)
# Only 'Fuel Qty At Liftoff' dependency.
fuel_qty_at_liftoff = KPV('Fuel Qty At Liftoff',
items=[KeyPointValue(132, 200)])
takeoff_fuel.set_flight_attr = Mock()
takeoff_fuel.derive(None, fuel_qty_at_liftoff)
takeoff_fuel.set_flight_attr.assert_called_once_with(200)
# Both, 'AFR Takeoff Fuel' used.
takeoff_fuel.set_flight_attr = Mock()
takeoff_fuel.derive(afr_takeoff_fuel, fuel_qty_at_liftoff)
takeoff_fuel.set_flight_attr.assert_called_once_with(100)
def test_can_operate(self):
self.assertEqual(TakeoffFuel.get_operational_combinations(),
[('AFR Takeoff Fuel',), ('Fuel Qty At Liftoff',),
('AFR Takeoff Fuel', 'Fuel Qty At Liftoff')])