public static void TestCars1()
{
Console.WriteLine("\nTestCars1");
Console.WriteLine("----------");
Car car1 = new Car();
car1.DescribeCar();
Console.WriteLine("----------");
ConvertibleCar car2 = new ConvertibleCar();
car2.DescribeCar();
Console.WriteLine("----------");
Minivan car3 = new Minivan();
car3.DescribeCar();
System.Console.WriteLine("----------");
}