pytest + plugin + __init__.py as argument = error

[akeeman]

Apparently there has been some struggle already with __init__.py files, and I'd like to add a case to that, that still is broken:

Try running a pytest, enable a plugin (I tried it with flakes and black), and pass an __init__.py file as file argument (may be among others), e.g.

$ pytest --flakes my_repo/__init__.py
=============================== test session starts ================================
platform linux -- Python 3.8.0, pytest-6.0.2, py-1.9.0, pluggy-0.13.1
rootdir: /path/to/my_repo, configfile: pyproject.toml
plugins: flakes-4.0.1
collected 0 items / 1 error                                                        

====================================== ERRORS ======================================
__________________________ ERROR collecting test session ___________________________
.venv/lib/python3.8/site-packages/_pytest/runner.py:294: in from_call
    result = func()  # type: Optional[_T]
.venv/lib/python3.8/site-packages/_pytest/runner.py:324: in <lambda>
    call = CallInfo.from_call(lambda: list(collector.collect()), "collect")
.venv/lib/python3.8/site-packages/_pytest/main.py:576: in collect
    yield from self._collect(fspath, parts)
.venv/lib/python3.8/site-packages/_pytest/main.py:662: in _collect
    yield next(iter(m[0].collect()))
.venv/lib/python3.8/site-packages/_pytest/nodes.py:457: in collect
    raise NotImplementedError("abstract")
E   NotImplementedError: abstract
============================= short test summary info ==============================
ERROR  - NotImplementedError: abstract
!!!!!!!!!!!!!!!!!!!!!! Interrupted: 1 error during collection !!!!!!!!!!!!!!!!!!!!!!
================================= 1 error in 0.12s =================================

It should have something to do with the block here.

[akeeman]

I think this should be seen purely as a plugin error, so let's fix it there.

[dmtucker]

I suspect this may no longer reproduce in 6.2.0+ because of 66311ff#diff-689af6a98fad782f87c1473a3758c720d3e23ea0ecdc89617df250b2a093c6a8L778-R785