public void FactShouldThrowWhenNegativeNumber()
{
var func = new Fact();
var args = FunctionsHelper.CreateArgs(-1);
func.Execute(args, _parsingContext);
}
public void FactShouldRoundDownAndReturnCorrectResult()
{
var func = new Fact();
var args = FunctionsHelper.CreateArgs(5.99);
var result = func.Execute(args, _parsingContext);
Assert.AreEqual(120d, result.Result);
}