[pytest-dev] tips on writing a plugin for a third-party test framework?

[Ringo De Smet]

Harry,

I also implemented a custom pytest plugin which I can't open source at this
moment. But what I did find is that the traceback filtering in case of test
failures doesn't work correctly when returning custom test `Item` objects.
See this mail thread from the archives about it:

https://mail.python.org/pipermail/pytest-dev/2018-March/004372.html

Hope it helps you too.

Ringo


On 28 June 2018 at 11:05, Harry Percival <obeythetestinggoat at gmail.com>
wrote:

> PS a couple of people have already pointed me towards some useful example
> repos:
>
> - Sybil: https://github.com/cjw296/sybil/blob/master/sybil/
> integration/pytest.py
> - Pytest-CPP:  https://github.com/pytest-dev/
> pytest-cpp/blob/master/pytest_cpp/plugin.py  <-- really nice and simple :)
>
> so I've been able to make a start, and i actually already have a hacky
> first cut.  all good!
>
>
> On Sun, Jun 24, 2018 at 8:17 PM Harry Percival <
> obeythetestinggoat at gmail.com> wrote:
>
>> hi there,
>>
>> at work we use a test framework called "Contexts":
>> http://contexts.readthedocs.io/en/v0.11.2/
>>
>> it's basically a syntax for declaring tests using a given/when/then kind
>> of syntax, using classes and special methods.
>>
>> as a way of structuring your tests it's... fine, once you get used to
>> it.  as a test runner and assertion framework it's fairly primitive.  so
>> i'd like to write a pytest plugin for it that basically just re-uses the
>> parts of it that know how to recognise given/when/then bits, and then just
>> use pytest as the test runner and assertion library.
>>
>> any pointers for how to get started? i thought i'd get a prototype
>> started just based on `conftest.py`, and I've found the
>> `pytest_pycollect_makeitem` which seems to be a good place to intercept for
>> collecting tests, but I don't know what it's supposed to return (an
>> "Item"?  what's that?  docs are minimal)  or how to provide info about
>> setup and teardown methods, which I guess would need to become fixtures
>> somehow, but how would I associate them with a test method?
>>
>> maybe there's some example code somewhere i could look at?  i tried
>> peeking at pytest-bdd but it seems to be doing things at a lower level...
>>
>> hp
>>
>>
>>
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-- 
*Ringo De Smet*
ringo.de.smet at ontoforce.com
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