As u/grinnin_barrett points out bias testing requires someone or something making the test and making judgement calls on what is an acceptable or unacceptable level of bias.

At minimum voters need to be invested in the country so my personal direction is more along the lines of the 'service guarantees citizenship' model. I'm not so naive to think that this system doesn't have problems, but I do think that only citizens should be able to vote, and that there needs to be some kind of process of national service (whatever that looks like) to allow people to invest in the country and be rewarded for it.