public void canProduceCorrectFibonacciNthNumber()
{
Tuple <int, BigInteger>[] correctNthFibonacciNumbers =
{
Tuple.Create(1, (BigInteger)1),
Tuple.Create(2, (BigInteger)1),
Tuple.Create(3, (BigInteger)2),
Tuple.Create(4, (BigInteger)3),
Tuple.Create(5, (BigInteger)5),
Tuple.Create(6, (BigInteger)8),
Tuple.Create(7, (BigInteger)13),
Tuple.Create(8, (BigInteger)21),
Tuple.Create(9, (BigInteger)34),
Tuple.Create(10, (BigInteger)55),
Tuple.Create(99, BigInteger.Parse("218922995834555169026")),
Tuple.Create(100, BigInteger.Parse("354224848179261915075")),
};
var calculator = new FibonacciSequenceCalculator();
foreach (var nPair in correctNthFibonacciNumbers)
{
var result = calculator.CalculateNthNumber(nPair.Item1);
Assert.AreEqual(nPair.Item2, result);
}
}
public void canHandleInvalidInput()
{
int[] sampleInvalidInputData = { int.MinValue, -1, 0, 101, int.MaxValue };
var calculator = new FibonacciSequenceCalculator();
foreach (var n in sampleInvalidInputData)
{
var result = calculator.CalculateNthNumber(n);
Assert.AreEqual(-1, result);
}
}
