public void AddGasCar_ShouldBeCorrect()
{
CarRepository _gasCar = new CarRepository();
TypeOfCar gasCar = new TypeOfCar();
TypeOfCar garCarTwo = new TypeOfCar();
_gasCar.AddGasCar(gasCar);
_gasCar.AddGasCar(garCarTwo);
int actual = _gasCar.GasCars().Count;
int expected = 2;
Assert.AreEqual(expected, actual);
}