public void Calculate()
{
// Arrange
var service = new FibonacciNumberService();
// Act
var test1 = service.Calculate(-4);
var test2 = service.Calculate(-5);
var test3 = service.Calculate(0);
var test4 = service.Calculate(1);
var test5 = service.Calculate(-6);
var test6 = service.Calculate(3);
var test7 = service.Calculate(4);
var test8 = service.Calculate(5);
var test9 = service.Calculate(6);
var test10 = service.Calculate(7);
var test11 = service.Calculate(46);
var test12 = service.Calculate(47);
var test13 = service.Calculate(47);
long? test14 = null;
try
{
test14 = service.Calculate(93);
}
catch (Exception ex) when (ex.Message.StartsWith("Value cannot be greater than 92, since the result will cause a 64-bit integer overflow."))
{
// Silently catch the expected exception.
}
long? test15 = null;
try
{
test15 = service.Calculate(-93);
}
catch (Exception ex) when (ex.Message.StartsWith("Value cannot be less than -92, since the result will cause a 64-bit integer overflow."))
{
// Silently catch the expected exception.
}
// Assert
Assert.IsTrue(test1 == -3);
Assert.IsTrue(test2 == 5);
Assert.IsTrue(test3 == 0);
Assert.IsTrue(test4 == 1);
Assert.IsTrue(test5 == -8);
Assert.IsTrue(test6 == 2);
Assert.IsTrue(test7 == 3);
Assert.IsTrue(test8 == 5);
Assert.IsTrue(test9 == 8);
Assert.IsTrue(test10 == 13);
Assert.IsTrue(test11 == 1836311903);
Assert.IsTrue(test12 == 2971215073);
Assert.IsTrue(test13 == 2971215073);
Assert.IsTrue(test14 == null);
Assert.IsTrue(test15 == null);
}
/// <summary>
/// Generate the Fibonacci Number.
/// </summary>
/// <param name="n">Index in the sequence.</param>
/// <returns>The number at n position in the Fibonacci sequence.</returns>
public long FibonacciNumber(long n)
{
var properties = new Dictionary<string, string> { { "Argument 'n'", n.ToString() } };
telemetry.TrackEvent("FibonacciNumber", properties);
long result = 0;
try
{
result = new FibonacciNumberService().Calculate(n);
}
catch (ArgumentOutOfRangeException)
{
// The ArgumentOutOfRangeException is expected, therefore re-throw it further.
throw;
}
catch (Exception exception)
{
telemetry.TrackException(exception);
}
return result;
}