[Heartlander]

What tests could completely rule out everything except pure naturalism?

I think you are beginning to understand!
But you ask the wrong question – again IMHO

Now, how can does science rule out naturalism if that is all it is limited too?

(ID of any kind has already been ruled out of science… It’s up to science to prove that naturalism is all there is…)

[Dimensio]

Now, how can does science rule out naturalism if that is all it is limited too?

I think that you've just hit the problem. Science does not state that naturalism is all there is, but it cannot address anything that is outside of the natural universe. That is why, if ID or "Creation theory" appeals to a non-natural element, it is not science.