I've said this before, but: "Emissions test driven development" http://www.nytimes.com/2016/04/27/business/international/vw-presentation-in-06-showed-how-to-foil-emissions-tests.html?smid=tw-nytimes&smtyp=cur …
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And in principle, there is *no* point at which the developer genuinely has to give up. They can fake a working implementation forever.
If the tester and the developer are not on the same side, it is VERY difficult for the tester to force out the implementation they want
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This is at the unit test case level. At higher levels, fakery becomes harder, but is still possible if the developer is motivated
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The crucial point is this: it needs to be impossible to computationally distinguish an emissions test from regular driving
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