pytest == 5.1.2 raises ModuleNotFoundError on Windows

[laura-surcel]

Hello!

When using latest pytest version (pytest 5.1.2) on Windows, I encountered an issue when pytest is trying to load a conftest.py module found in a folder with both uppercase and lowercase letters.

Stacktrace:

ImportError while loading conftest 'd:\pkg\tests\mng\conftest.py'.
ModuleNotFoundError: No module named 'tests.mng'

The file on disk is at the path: D:\pkg\tests\Mng\conftest.py

The error appears when running any pytest command in the D:\pkg directory. Example:

D:\pkg>pytest --collect-only tests

I tested with both pytest 5.1.1 and with 5.1.2.
pytest 5.1.1: no issues
pytest 5.1.2: ModuleNotFoundError

pip list:
Package Version Location

---

amqp 1.4.9
anyjson 0.3.3
APScheduler 3.5.3
asn1crypto 0.24.0
astroid 2.2.5
atomicwrites 1.3.0
attrs 19.1.0
backcall 0.1.0
backpack 0.22.0
backports.functools-lru-cache 1.5
beautifulsoup4 4.8.0
billiard 3.3.0.23
bleach 3.1.0
celery 3.1.26.post2
celery-with-redis 3.0
certifi 2019.9.11
cffi 1.12.3
chardet 3.0.4
check-manifest 0.39
cheroot 6.5.8
CherryPy 17.4.2
Click 7.0
colander 1.7.0
colorama 0.4.1
contextlib2 0.5.5
cornice 1.0.0
coverage 4.5.4
cryptography 2.7
decorator 4.4.0
devpi-client 2.3.0
devpi-common 3.4.0
elasticsearch-provisioner 0.10.0
enum34 1.1.6
filelock 3.0.12
flume-logger 1.13.0
future 0.17.1
gitdb2 2.0.5
GitPython 2.1.13
graphviz 0.13
hiredis 1.0.0
hupper 1.8.1
idna 2.8
importlib-metadata 0.19
ipaddress 1.0.22
ipdb 0.12.2
ipython 7.7.0
ipython-genutils 0.2.0
iso8601 0.1.12
isort 4.3.21
jaraco.functools 2.0
jedi 0.14.1
Jinja2 2.10.1
jsonschema 2.6.0
kazoo 2.6.1
lazy-object-proxy 1.4.1
lxml 4.4.1
MarkupSafe 1.1.1
mccabe 0.6.1
MiniMock 1.2.8
mock 3.0.5
more-itertools 5.0.0
msgpack 0.6.1
mysqlclient 1.4.2
nose 1.3.7
nose-exclude 0.5.0
objgraph 3.4.1
packaging 19.1
parameterized 0.7.0
parso 0.5.1
PasteDeploy 2.0.1
pbr 5.4.3
pem 19.2.0
pickleshare 0.7.5
pip 19.2.3
pip-tools 4.0.0
pkginfo 1.5.0.1
plaster 1.0
plaster-pastedeploy 0.7
pluggy 0.12.0
plumbum 1.6.7
portend 2.5
prompt-toolkit 2.0.9
psutil 5.6.3
py 1.8.0
pycparser 2.19
pycryptodomex 3.9.0
pycurl 7.43.0.2
PyDispatcher 2.0.5
Pygments 2.4.2
pylint 2.3.1
pymongo 3.9.0
pyOpenSSL 19.0.0
pyparsing 2.4.2
pyramid 1.10.4
pyreadline 2.1
pytest 5.1.2
pytest-mock 1.10.4
python-dateutil 2.8.0
pytz 2019.2
pywin32 225
PyYAML 3.11
pyzmq 18.1.0
redis 2.10.6
release-me 0.18.1
pkg 3.32.1.dev10+g2437e44.d20190917 d:\pkg
repoze.lru 0.6
requests 2.22.0
setuptools 41.2.0
setuptools-scm 1.17.0
simplejson 3.8.2
six 1.12.0
smmap2 2.0.5
soupsieve 1.9.3
SQLAlchemy 1.3.8
sqlalchemy-migrate 0.12.0
sqlparse 0.3.0
Tempita 0.5.2
tempora 1.14.1
thrift 0.11.0
toml 0.10.0
tox 3.13.2
traitlets 4.3.2
translationstring 1.3
typed-ast 1.4.0
tzlocal 2.0.0
urllib3 1.25.3
validators 0.10.1
venusian 1.2.0
virtualenv 16.7.2
waitress 1.3.1
wcwidth 0.1.7
web.py 0.40.dev1
webencodings 0.5.1
WebOb 1.8.5
WebTest 2.0.33
wheel 0.33.6
wincertstore 0.2
wrapt 1.11.2
xmltodict 0.11.0
zc.lockfile 2.0
zipp 0.5.2
zope.deprecation 4.4.0
zope.interface 4.6.0

Windows version: Windows 10 Enterprise 1809

[blueyed]

#5819 ?

[Zac-HD]

Yep, this has been fixed by #5840 and 5.1.3 should be unaffected. Sorry for the inconvenience @laura-surcel!