public void PrevTest()
 {
     Fibonacci fib = new Fibonacci(13);
     Assert.IsTrue(fib.Get() == 13, "==");
     fib.Prev();
     Assert.IsTrue(fib.Get() == 8);
     fib.Next();
     Assert.IsTrue(fib.Get() == 13);
     fib.Next();
     Assert.IsTrue(fib.Get() == 21);
 }
        public void FibonacciTest()
        {
            //0,1,1,2,3,5,8,13,21,34,55
            Fibonacci fib = new Fibonacci(13);
            Assert.IsTrue(fib.Get() == 13, "==");

            Fibonacci fib2 = new Fibonacci(35);
            Assert.IsTrue(fib2.Get() == 55, "<");
        }