public void Sum_PassValidNumber()
{
var target = new Problem1();
Assert.AreEqual(15, target.Sum(5));
Assert.AreEqual(1, target.Sum(1));
// now for some fancy randomized testing.
var random = new Random();
// test three different random numbers between 1 and 10000.
var x = random.Next(1, 10000);
Assert.AreEqual((x * (x + 1)) / 2, target.Sum(x));
x = random.Next(1, 10000);
Assert.AreEqual((x * (x + 1)) / 2, target.Sum(x));
x = random.Next(1, 10000);
Assert.AreEqual((x * (x + 1)) / 2, target.Sum(x));
}
public void Sum_PassZero()
{
var target = new Problem1();
Assert.AreEqual(0, target.Sum(0));
}
public void Sum_PassNegativeNumber()
{
var target = new Problem1();
target.Sum(-3);
}