def test_derive(self):
landing_fuel = LandingFuel()
landing_fuel.set_flight_attr = Mock()
# Only 'AFR Takeoff Fuel' dependency.
afr_landing_fuel = A('AFR Landing Fuel', value=100)
landing_fuel.derive(afr_landing_fuel, None)
landing_fuel.set_flight_attr.assert_called_once_with(100)
# Only 'Fuel Qty At Liftoff' dependency.
fuel_qty_at_touchdown = KPV('Fuel Qty At Touchdown',
items=[KeyPointValue(87, 160),
KeyPointValue(132, 200)])
landing_fuel.set_flight_attr = Mock()
landing_fuel.derive(None, fuel_qty_at_touchdown)
landing_fuel.set_flight_attr.assert_called_once_with(200)
# Both, 'AFR Takeoff Fuel' used.
landing_fuel.set_flight_attr = Mock()
landing_fuel.derive(afr_landing_fuel, fuel_qty_at_touchdown)
landing_fuel.set_flight_attr.assert_called_once_with(100)
def test_can_operate(self):
self.assertEqual(LandingFuel.get_operational_combinations(),
[('AFR Landing Fuel',), ('Fuel Qty At Touchdown',),
('AFR Landing Fuel', 'Fuel Qty At Touchdown')])
