public void FactorialOf1Is1()
{
//setup
FactorialUtil f = new FactorialUtil();
//exercise
long result = f.Factorial(1);
//verify
long expected = 1;
Assert.AreEqual(expected, result);
}
public void FactorialOfXIsXTimesFactXMin1()
{
//setup
FactorialUtil f = new FactorialUtil();
//exercise
for (long x = 2; x < 30; x++)
{
long result = f.Factorial(x);
//verify
long expected = x * f.Factorial(x - 1);
Console.WriteLine("{0}! = {1}", x, result);
Assert.AreEqual(expected, result);
}
}
public void FactorialOfNegativeThrowArgumentOutOfRangeException()
{
//setup
FactorialUtil f = new FactorialUtil();
//exercise
try
{
long result = f.Factorial(-1);
Assert.Fail();
}
catch (Exception e)
{
//verify
Assert.IsInstanceOfType(e, typeof(ArgumentOutOfRangeException));
}
}
public void Initialization()
{
f = new FactorialUtil();
Console.Write("Initialization Done!");
}
