Making mistakes: Django startproject and Rails new
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I like to see how software reacts when I step off the happy path . Today I found this interesting difference with an unknown (or misspelled) command line option: “ –derp” :
An interesting difference! Personally, Django is reacting like I’d expect. And so for me it’s following the principle of least astonishment . Rails, on the other hand, doesn’t give any indication that it didn’t understand the –derp instruction. It simply goes ahead and creates myapp . I see it as producing a false negative (whereas Django delivered a true positive ).
False negatives and false positives is a really interesting area in medical testing as well as software development. Consensus seems to be that false negatives are the more severe problem:
False negatives … are given when the test case passes, but there is in fact a bug present in the system and/or the functionality is not working as it should.
Though both are an annoyance, it’s safe to say that a false negative is more damaging than a false positive, as it creates a false sense of security.
Paul C, Watching Out for False Positives and False Negatives in Software TestingRecommend
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