Any adequate test of people's understanding of politics and the democratic process would fail anyone who thought testing understanding of politics and the democratic process was compatible with democracy....
The essence of democracy is that you don't need a detailed understanding of the history, voter mechanics or text of a particular law to express a valid preference for or against a candidate that has something to say that concerns you, however imperfect your understanding of that candidate's intentions and their likely consequences may be. If you can't grasp that, bar yourself from the ballot box.
(and that's without discussing the obvious electoral advantages to an incumbent that might accrue from influence over setting "voter tests". Sure, you have to pass a bar to be allowed to work for somebody, or study somewhere, or borrow money - that's all for the testers' benefit)
The essence of democracy is that you don't need a detailed understanding of the history, voter mechanics or text of a particular law to express a valid preference for or against a candidate that has something to say that concerns you, however imperfect your understanding of that candidate's intentions and their likely consequences may be. If you can't grasp that, bar yourself from the ballot box.
(and that's without discussing the obvious electoral advantages to an incumbent that might accrue from influence over setting "voter tests". Sure, you have to pass a bar to be allowed to work for somebody, or study somewhere, or borrow money - that's all for the testers' benefit)