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I thought TDD meant doing tests before implementing code rather simply testing code.

So I always assumed someone testing his code wasn't necessarily TDDing, and that someone not TDDing wasn't necessarily not testing, just that she tests after implementation.

Is my understanding of TDD wrong ?

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You are correct.

I incorrectly interpreted "don't do TDD" as "don't do tests".

I always thought it meant DRIVING the design as well.

The term TDD gets conflated with unit testing, and testing in general that it gets quite confusing have a discussion without going into hyperbole.

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