[Python-ideas] Please consider adding context manager versions of setUp/tearDown to unittest.TestCase

[Nick Timkovich]

Knowing nothing about the JavaScript ecosystem (other than that leftpad is
apparently not a joke and everything needs more jQuery), what are the
leagues-above testing libraries?

On Tue, Aug 22, 2017 at 5:20 PM, rymg19 at gmail.com <rymg19 at gmail.com> wrote:

> TBH you're completely right. Every time I see someone using unittest
> andItsHorriblyUnpythonicNames, I want to kill a camel.
>
> Sometimes, though, I feel like part of the struggle is the alternative. If
> you dislike unittest, but pytest is too "magical" for you, what do you use?
> Many Python testing tools like nose are just test *runners*, so you still
> need something else. In the end, many just end up back at unittest, maybe
> with nose on top.
>
> As much as I hate JavaScript, their testing libraries are leagues above
> what Python has.
>
> --
> Ryan (ライアン)
> Yoko Shimomura, ryo (supercell/EGOIST), Hiroyuki Sawano >> everyone elsehttp://refi64.com
>
> On Aug 22, 2017 at 5:09 PM, <Chris Barker <chris.barker at noaa.gov>> wrote:
>
> ** Caution: cranky curmudgeonly opinionated comment ahead: **
>
>
> unitest is such an ugly Java-esque static mess of an API that there's
> really no point in trying to clean it up and make it more pythonic -- go
> off and use pytest and be happier.
>
> -CHB
>
>
>
> On Tue, Aug 22, 2017 at 5:42 AM, Nick Coghlan <ncoghlan at gmail.com> wrote:
>
>> On 22 August 2017 at 15:34, Nick Coghlan <ncoghlan at gmail.com> wrote:
>> > On 21 August 2017 at 11:32, Neil Girdhar <mistersheik at gmail.com> wrote:
>> >> This question describes an example of the problem:
>> >> https://stackoverflow.com/questions/8416208/in-python-is-
>> there-a-good-idiom-for-using-context-managers-in-setup-teardown.
>> >> You want to invoke a context manager in your setup/tearing-down, but
>> the
>> >> easiest way to do that is to override run, which seems ugly.
>> >
>> > Using context managers when you can't use a with statement is one of
>> > the main use cases for contextlib.ExitStack():
>> >
>> >     def setUp(self):
>> >         self._resource_stack = stack = contextlib.ExitStack()
>> >         self._resource = stack.enter_context(MyResource())
>> >
>> >     def tearDown(self):
>> >         self._resource_stack.close()
>> >
>> > I posted that as an additional answer to the question:
>> > https://stackoverflow.com/questions/8416208/in-python-is-
>> there-a-good-idiom-for-using-context-managers-in-setup-
>> teardown/45809502#45809502
>>
>> Sjoerd pointed out off-list that this doesn't cover the case where
>> you're acquiring multiple resources and one of the later acquisitions
>> fails, so I added the ExitStack idiom that covers that case (using
>> stack.pop_all() as the last operation in a with statement):
>>
>>     def setUp(self):
>>         with contextlib.ExitStack() as stack:
>>             self._resource1 = stack.enter_context(GetResource())
>>             self._resource2 = stack.enter_context(GetOtherResource())
>>             # Failures before here -> immediate cleanup
>>             self.addCleanup(stack.pop_all().close)
>>             # Now cleanup won't happen until the cleanup functions run
>>
>> I also remember that using addCleanup lets you avoid defining tearDown
>> entirely.
>>
>> Cheers,
>> Nick.
>>
>> --
>> Nick Coghlan   |   ncoghlan at gmail.com   |   Brisbane, Australia
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>>
>
>
> --
>
> Christopher Barker, Ph.D.
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