public void FactorialApprovalTests()
{
StringBuilder fakeoutput = new StringBuilder();
Console.SetOut(new StringWriter(fakeoutput));
Console.SetIn(new StringReader("a\n"));
Console.WriteLine("1 -> " + Factorial.calculate(1));
Console.WriteLine("2 -> " + Factorial.calculate(2));
Console.WriteLine("3 -> " + Factorial.calculate(3));
Console.WriteLine("10 -> " + Factorial.calculate(10));
string output = fakeoutput.ToString();
Approvals.Verify(output);
}