private void ShowACar()
        {
            Console.WriteLine("What is the car ID you want to see?");
            int       carID = int.Parse(Console.ReadLine());
            GreenPlan crud  = _carRepo.GetCarInfo(carID);

            Console.WriteLine($"{crud.CarID} {crud.YearOfCar} {crud.MakeOfCar} {crud.ModelOfCar} {crud.GasMileage} {crud.CarType} ");
            Console.ReadLine();
        }
        public void AddAndGetInfoForOneCar()
        {
            GreenRepository repoInfo      = new GreenRepository();
            GreenPlan       customerInfo  = new GreenPlan(1, 2015, "Honda", "Sonata", 32d, CarType.Hybrid);
            GreenPlan       customerInfo2 = new GreenPlan(2, 2010, "Honda", "Sonata", 32d, CarType.Hybrid);

            repoInfo.AddCarToList(customerInfo);
            repoInfo.AddCarToList(customerInfo2);

            var expected = customerInfo2;
            var actual   = repoInfo.GetCarInfo(2);

            Assert.AreEqual(expected, actual);
        }