I have also been bitten by this order, but I can also blame myself for not reading the documentation and relying on my previous experience with other libraries, thus building an intuition that I believed was universal (when it was in fact not). I don't think it's worth much arguing about the order of things or the "intuition" at play here, since fortunately this library comes with a manual. Very few software match our mental expectations, and even the one we write are specifically tailored for our selves of a given time and place. And as we all know, we are a stranger to our future selves. Cheers Hécate Le 01/03/2022 à 18:56, Daneel Yaitskov a écrit :
Hi List,
I noticed, that I pay more attention than I should, when working with assertions, because I am not sure about argument order i.e. whether the expected value goes first or vice-versa. Does anybody have similar thought?
Such subtle detail should be easy to grasp with regular practice, but I observe difficulties and I suspect that there is a logical reason for that.
Unit tests appeared long time ago in Java and spread over all languages. HUnit library inherited de facto standard assert function name and signature. I don't know reasoning behind original signature.
I spell "assertEqual" expression as: "Assert that x equals to y" "y" sounds like a model value (i.e. expected value).
In assignments |"x <- y"| y is the model value, because it defines |"x"|. You get |"x"| - value on the left not on the right.
Similar issue with test fixing - I always have to check first, that an expected value is actually one. There is no type safety preventing mixing arguments. I had to open and comprehend a source file with test, because test log is not 100% safe.
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Best regards, Daniil Iaitskov
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