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Having one set of developers write the code and another set of developers write tests from the same specification without reading the code is probably the most effective ways to use tests for high software quality and is typically required by certification bodies e.g. for avionics.

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That’s a good point for things with certain kinds of specs, but it seems a hell of a lot more straightforward for the person who is writing an implementation to also be in a testing mindset (if only to be writing testable code)

Perhaps people in these environments are made of different stuff but touching both sides feels almost essential to me.

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