public void Correct_Number_Of_Tires()
        {
            var truck = new ElectricCar("Nissan", "Leaf");
            Assert.AreEqual(4, truck.NumOfTires);

            var motorcycle = new Motorcycle("Honda", "CTX700N");
            Assert.AreEqual(2, motorcycle.NumOfTires);
        }
        public void Vehicles_Describe_Themselves()
        {
            var truck = new ElectricCar("Nissan", "Leaf");
            Assert.AreEqual("This is a Nissan Leaf", truck.ToString());

            var motorcycle = new Motorcycle("Honda", "CTX700N");
            Assert.AreEqual("This is a Honda CTX700N", motorcycle.ToString());
        }