public void AddHybridCar_ShouldBeCorrect()
{
CarRepository _hybridCar = new CarRepository();
TypeOfCar hybrid = new TypeOfCar();
TypeOfCar hybridTwo = new TypeOfCar();
_hybridCar.AddHybridCar(hybrid);
_hybridCar.AddHybridCar(hybridTwo);
int actual = _hybridCar.HybridCars().Count;
int expected = 2;
Assert.AreEqual(expected, actual);
}