public void Benchmark()
{
var stopwatch = new Stopwatch();
stopwatch.Start();
var result = Fibonacci.Get(90);
stopwatch.Stop();
Assert.That(result, Is.EqualTo(2_880_067_194_370_816_120));
Assert.That(stopwatch.ElapsedMilliseconds, Is.LessThan(5));
}
public void Returns_nth_fibonacci_number(int n, long expected)
{
Assert.That(Fibonacci.Get(n), Is.EqualTo(expected));
}
public void Rejects_negative_numbers(int n)
{
Assert.That(() => Fibonacci.Get(n),
Throws.TypeOf <ArgumentOutOfRangeException>());
}