Using TDD: “top down” vs. “bottom up”

Question

Since I\'m a TDD newbie, I\'m currently developing a tiny C# console application in order to practice (because practice makes perfect, right?). I started by making a simple sket

Answer 1

If you moved stuff out of main(), could you not test that function?

It makes sense to do that, since you might want to run with different cmd-args and you'd want to test those.