public void FactorialTest()
{
var numbers = new[] { 1, 2, 3, 4, 5 };
var factorials = new[] { 1, 2, 6, 24, 120 };
for (int i = 0; i < numbers.Length; i++)
{
Assert.AreEqual(factorials[i], EquationSolver.GetFactorial(numbers[i]));
}
}