On Fri, Nov 21, 2014 at 04:15:07PM -0500, Sean Dague wrote: > On 11/21/2014 01:52 PM, Matthew Treinish wrote: > > On Fri, Nov 21, 2014 at 07:15:49PM +0100, jordan pittier wrote: > >> Hey, > >> I am not a Nova developer but I still have an opinion. > >> > >>> Using boolean assertions > >> I like what you propose. We should use and enforce the assert* that best > >> matches the intention. It's about semantic and the more precise we are, > >> the better. > >> > >>> Using same order of arguments in equality assertions > >> Why not. But I don't know how we can write a Hacking rule for this. So you > >> may fix all the occurrences for this now, but it might get back in the > >> future. > > > > Ok I'll bite, besides the enforceability issue which you pointed out, it > > just > > doesn't make any sense, you're asserting 2 things are equal: (A == B) == (B > > == A) > > and I honestly feel that it goes beyond nitpicking because of that. > > > > It's also a fallacy that there will always be an observed value and an > > expected value. For example: > > > > self.assertEqual(method_a(), method_b()) > > > > Which one is observed and which one is expected? I think this proposal is > > just > > reading into the parameter names a bit too much. > > If you are using assertEqual with 2 variable values... you are doing > your test wrong. > > I was originally in your camp. But honestly, the error message provided > to the user does say expected and observed, and teaching everyone that > you have to ignore the error message is a much harder thing to do than > flip the code to conform to it, creating less confusion. >
Uhm, no it doesn't, the default error message is "A != B". [1][2][3] (both with unittest and testtools) If the error message was like that, then sure saying one way was right over the other would be fine, (assuming you didn't specify a different error message) but, that's not what it does. [1] https://github.com/testing-cabal/testtools/blob/master/testtools/testcase.py#L340 [2] https://github.com/testing-cabal/testtools/blob/master/testtools/matchers/_basic.py#L85 [3] https://hg.python.org/cpython/file/301d62ef5c0b/Lib/unittest/case.py#l508
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