How competent at coding should testers be?

My thesis is that all testers could benefit from some programming knowledge, but you don’t need to be as ‘good’ a programmer as a professional developer in order to add value. It depends of course, but if you have to deal with developers and their code, it must be helpful to be able to read and understand their code. Code comprehension is a less ambitious goal than programming. The level of skill varies with the task in hand. There is a range of technical capabilities that testers are being asked for these days, but these do not usually require you to be professional programmer.

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