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 tried adversarial TDD at work once, as an exercise. One person writes one test, the other writes the minimum of code to make it pass
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
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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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