It cannot be automated or systematized because neural networks are the tool you use to defeat systems like that. If there's a defined, objective test, a neural network can train for/on that test and 'learn' to ace it. It's just what they do.
The only way to test for 'true' intelligence would be to perfectly define it first, such that when the NN aced the test that would prove intelligence. That is, IF you could perfectly define intelligence, doing so would more or less give you all the tools you needed to create it.
All these people claiming we already have general AI or even anything like it have put the cart so far before the horse.