public void Factorial_ThrowsArgumentException_WhenInputIsLessThan0()
{
var input = -1;
var sut = new Problem20();
Assert.Throws(typeof(ArgumentException), () => sut.Factorial(input));
}
public void Factorial_Returns1_WhenInputIs0Or1(int n)
{
var sut = new Problem20();
var actual = sut.Factorial(n);
Assert.AreEqual(new BigInteger(1), actual);
}
public void Factorial_Returns3628800_WhenInputIs10()
{
var input = 10;
var sut = new Problem20();
var actual = sut.Factorial(input);
Assert.AreEqual(new BigInteger(3628800), actual);
}
public int Test_Solution(int x)
{
var sut = new Problem20();
var actual = sut.Solve(n: x);
TestContext.WriteLine(actual);
return(actual);
}