[Python-Dev] setUpClass and setUpModule in unittest

[Robert Collins]

On Sat, 2010-02-13 at 01:04 +0000, Michael Foord wrote:


> > However from this example I *cannot* guess whether those resources are
> > set up and torn down per test or per test class.
> This particular example is the equivalent of setUpClass - so by 
> declaring the resource as a class attribute it will created before the 
> first test for the class is run and disposed of after the last test for 
> the class.
> 
> You could *also* create a single resource and share it between several 
> test classes, or even across classes in several modules, and have it 
> created and disposed of at the right point. I've copied Rob Collins in 
> on this email in case I've misunderstood.

Yes, precisely.

> > Also the notation
> >
> >    resources = [('workdir', MyTempDir())]
> >
> > looks pretty ugly -- if 'workdir' ends up being an instance attribute,
> > why not make it a dict instead of a list of tuples? Or even better, a
> > could each resource become a class variable?

I have two key 'todos' planned in the notation for testresources:
 - I want to make a decorator to let individual tests (rather
than /just/ class scope as currently happens) get resources easily.

Something like

    @resource(workdir=MyTempDir())
    def test_foo(self):
        pass


Secondly, I want to make the class level 'resources' list into a dict.
It was a list initially, for misguided reasons that no longer apply, and
it would be much nicer and clearer as a dict.


> >    
> I guess we could introspect the class for every attribute that is a 
> resource, but I prefer some way of explicitly declaring which resources 
> a TestCase is using.

I could see doing the below as an alternative:
@resource(workdir=MyTempDir())
class TestFoo(TestCase):
    ...

I'm not personally very keen on inspecting everything in self.__dict__,
I suspect it would tickle bugs in other unittest extensions. However I'm
not really /against/ it - I don't think it will result in bad test
behaviour or isolation issues. So if users would like it, lets do it.

-Rob
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