def test_drive__when_fuel_needed_equal_to_amount__should_be_zero(self):
car_manager = Car(self.make, self.model, self.fuel_consumption, self.fuel_capacity)
car_manager.fuel_amount = 5
car_manager.drive(500)
expected = 0
self.assertEqual(expected, car_manager.fuel_amount)
def test_drive__when_fuel_needed_more_than_amount__should_raise_exception(self):
car_manager = Car(self.make, self.model, self.fuel_consumption, self.fuel_capacity)
car_manager.fuel_amount = 7
with self.assertRaises(Exception):
car_manager.drive(5000)
def test_drive__when_fuel_needed_less_than_amount__should_decrease(self):
car_manager = Car(self.make, self.model, self.fuel_consumption, self.fuel_capacity)
car_manager.fuel_amount = 7
car_manager.drive(500)
expected = 2
self.assertEqual(expected, car_manager.fuel_amount)