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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We discovered that if e.g. the first test case expects a method to return 1, the first implementation of the method will return 1 every time
If the second test case expects 2, the implementation will simply be revised to return 1 and 2 alternately.
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The tester had to write a *lot* of tests before the developer gave up and implemented the implementation that was really being tested for
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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.
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