How do you test for values?
Anyway, the obvious way is some sort of questionnaire. Adherence to values can be faked, of course.
You can then fall back on behaviours as evidence of values. This naturally leads to "a burqa disqualifies you for French citizenship".
On "which values?", there was a time when France and the US were Enlightened nations but nowadays even France has a Head of State who believes they're "Christian Nations" so the kinds of "values tests" that are applied to people are becoming less palatable to lefties... But still, Sarkozy will have some success in getting French leftists to support his racist policy because they agree on the "secular republican values" principle. Or at least he'll paralyse them into indecision over whether banning the Burqa is civic or racist. A man of words and not of deeds is like a garden full of weeds; a man of deeds and not of words is like a garden full of turds — Anonymous
You cannot impose values.