Writing unit tests is pretty much standard practice these days. Otherwise, how would you make sure that your code does what you expect? Yet, some software is mission-critical and merely testing a few examples – or even randomized testing – is not enough.
End-to-end (E2E) testing is one of the more common approaches to testing software, but it is complex, fragile expensive and low quality. As soon as we accept that the best way to test our system is to deploy it all together, with everything else that it interacts with and then try broad-brush interactions with the whole lot, we have lost control.
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