Re: [Pyobjc-dev] doctest and PyObjC

[Ronald O. <ron...@ma...>]

> On 6 Jan 2018, at 20:39, Just van Rossum <jus...@gm...> wrote:
> 
> Hello,
> 
> I’m having trouble with integrating PyObjC and doctest. Whenever a module contains an NSObject subclass, the doctest test discovery code fails like so:
> 
> 
> Traceback (most recent call last):
>  File "Lib/typemachine/ui/appDelegate.py", line 54, in <module>
>    doctest.testmod()
>  File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/doctest.py", line 1950, in testmod
>    for test in finder.find(m, name, globs=globs, extraglobs=extraglobs):
>  File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/doctest.py", line 933, in find
>    self._find(tests, obj, name, module, source_lines, globs, {})
>  File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/doctest.py", line 996, in _find
>    globs, seen)
>  File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/doctest.py", line 1027, in _find
>    self._from_module(module, val)):
>  File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/doctest.py", line 954, in _from_module
>    obj_mod = object.__objclass__.__module__
> AttributeError: 'NoneType' object has no attribute ‘__module__'
> 
> 
> Simplest way to reproduce:
> 
> =========
> from Foundation import NSObject
> 
> class Foo(NSObject):
>    pass
> 
> import doctest
> doctest.testmod()
> =========
> 
> I can’t judge whether this is a bug in doctest or in PyObjC.
> 
> Is there a workaround?
> 
> My problem is not so much that I can’t use doctest in NSObject subclasses, but rather that test discovery fails in general in the vicinity of PyObjC code. For example, I can’t use pytest’s test discovery at all: it simply fails any module that contains an NSObject subclass.
> 
> Thanks for any insights,

This appears to be a bug. I don’t have a workaround yet, but am investigating.

Ronald