Ask HN: What is the best way to test for computer programming aptitude?

Is it possible to design an accurate test to identify the type of mind and personality that is most likely to succeed as a programmer? If so, is it possible to make this a non-verbal test? Example of non-verbal test: http://en.wikipedia.org/wiki/Raven%27s_Progressive_Matrices There's this computer programming aptitude test from the University of Kent: http://www.kent.ac.uk/careers/tests/computer-test.htm I'm curious what HN thinks of its relevance and whether there could be an accurate non-verbal version of it.