def test_truck_can_attach_heavy_carriage(self):
truck = Truck()
truck.carry_limit = 1000
result = truck.attach_carriage(2000)
self.assertEqual(result, False)
def test_truck_can_attach_limit_carriage(self):
truck = Truck()
truck.carry_limit = 1000
result = truck.attach_carriage(1000)
self.assertEqual(result, True)