public void CombinatoricsHelper_Factorial_Test()
{
Assert.AreEqual(CombinatoricsHelper.Factorial(0), 1);
Assert.AreEqual(CombinatoricsHelper.Factorial(1), 1);
Assert.AreEqual(CombinatoricsHelper.Factorial(2), 2);
Assert.AreEqual(CombinatoricsHelper.Factorial(3), 6);
Assert.AreEqual(CombinatoricsHelper.Factorial(4), 24);
Assert.AreEqual(CombinatoricsHelper.Factorial(5), 120);
for (int i = 1; i < 21; i++)
{
Assert.AreEqual(CombinatoricsHelper.Factorial(i), i * CombinatoricsHelper.Factorial(i - 1));
}
}
public void CombinatoricsHelper_GeneratePermutation_Test()
{
var elements = new List <int>();
for (int noOfElements = 0; noOfElements < 5; noOfElements++)
{
elements.Add(noOfElements);
for (int choose = 0; choose < noOfElements; choose++)
{
var results = CombinatoricsHelper.GeneratePermutations(elements);
Assert.AreEqual(results.Count, CombinatoricsHelper.Factorial(elements.Count));
}
}
}
