[Pyobjc-dev] doctest and PyObjC

[Just v. R. <jus...@gm...>]

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,

Just