pytest-django cannot find my existing module

Question

to give a bit of context, I'm learning test unit in django and made an overly simple app to get started (Here is the structure of my project).

Here is my problem:
When launching my unit tests on my django app, I get a ModuleNotFoundError event though the module exists.

Sample of code:

from django.shortcuts import get_object_or_404, render
from .models import Book


def book_infos(request, pk):
    book = get_object_or_404(Book, pk=pk)
    return render(request, "book_infos.html", {'book': book})

And the test associated:

import pytest
from django.urls import reverse
from django.test import Client
from django_pytest.library.models import Book
from pytest_django.asserts import assertTemplateUsed


@pytest.mark.django_db
def test_book_infos_view():
    client = Client()
    Book.objects.create(author="Jules Verne",
                        title="20 milles lieues sous les mers")
    path = reverse('infos', kwargs={'pk': 1})
    response = client.get(path)
    content = response.content.decode()
    expected_content = "<p>Jules Verne | 20 milles lieues sous les mers</p>"

    assert content == expected_content
    assert response.status_code == 200
    assertTemplateUsed(response, "book_infos.html")

My pytest.ini is as follow

[pytest]
pythonpath = . library tests
DJANGO_SETTINGS_MODULE = django_pytest.settings
python_files = test_*.py

When I run pytest tests/library/test_views.py from django-pytest I get this result:

platform win32 -- Python 3.11.5, pytest-7.4.3, pluggy-1.3.0                                                     
django: version: 4.2.7, settings: django_pytest.settings (from ini)                                             
rootdir: ...\django-pytest\django_pytest
configfile: pytest.ini                                                                                          
plugins: django-4.6.0

_ ERROR collecting tests/library/test_views.py _

ImportError while importing test module '...\django-pytest\django_pytest\tests\library\test_views.py'.
Hint: make sure your test modules/packages have valid Python names.
Traceback:
C:\Python311\Lib\importlib\__init__.py:126: in import_module
    return _bootstrap._gcd_import(name[level:], package, level)
E   ModuleNotFoundError: No module named 'django_pytest.tests'

The same test run in debug I get this:

ERROR: not found: ...\django-pytest\django_pytest\tests\library\test_views.py::test_book_infos_view
(no name '...\\django-pytest\\django_pytest\\tests\\library\\test_views.py::test_book_infos_view' in any of [<Module test_views.py>])

tests/library/test_views.py:None (tests/library/test_views.py)
ImportError while importing test module '...\django-pytest\django_pytest\tests\library\test_views.py'.
Hint: make sure your test modules/packages have valid Python names.
Traceback:
..\..\..\venv\Lib\site-packages\_pytest\python.py:617: in _importtestmodule
    mod = import_path(self.path, mode=importmode, root=self.config.rootpath)
..\..\..\venv\Lib\site-packages\_pytest\pathlib.py:567: in import_path
    importlib.import_module(module_name)
C:\Python311\Lib\importlib\__init__.py:126: in import_module
    return _bootstrap._gcd_import(name[level:], package, level)

E   ModuleNotFoundError: No module named 'django_pytest.tests'

What I tried:
I checked the pytest/pytest-django compatibility.
I added pythonpath = . library tests to the pytest.ini following this.
I tried launching py -m pytest from django-pytest instead of django-pytest/django_pytest but got the following ERROR django_pytest/tests/library/test_views.py - django.core.exceptions.ImproperlyConfigured: Requested setting INSTALLED_APPS, but settings are not configured. You must either define the environment variable DJANGO_SETTINGS_MODULE or call settings.configure() before accessin...
I tried changing project structure (moving test in library module).

Would anyone have an idea why this error shows ?

Thank you!

Stack :

Python==3.11
Django==4.2.7
pytest==7.4.3
pytest-django==4.6.0

(All packages installed in venv)

Looks like the rootdir is wrong: rootdir: ...\django-pytest\django_pytest . The pythonpath config variable is relative to rootdir (docs), so pytest is looking for python modules in django_pytest instead of the project root directory. Have you tried removing the pythonpath config variable from pytest.ini? — CoffeeBasedLifeform
– CoffeeBasedLifeform, Commented Nov 3, 2023 at 16:04
These could be useful to you: determining rootdir and configfile, pytest import mechanisms and sys.path, pytest-django: managing the Python path — CoffeeBasedLifeform
– CoffeeBasedLifeform, Commented Nov 3, 2023 at 16:08
Hello @CoffeeBasedLifeform, yeah i tried without the pythonpath in pytest.ini but got the exact same results. Thanks for the links I'll look into it. — JulienS
– JulienS, Commented Nov 3, 2023 at 16:22
You are probably missing __init__.py file in your django_pytest/ folder — Sardorbek Imomaliev
– Sardorbek Imomaliev, Commented Nov 3, 2023 at 17:02
Hello @SardorbekImomaliev, django_pytest/__init__.py exists (I edited the psot with the project structure) — JulienS
– JulienS, Commented Nov 6, 2023 at 9:56

JulienS · Accepted Answer · 2023-11-10 11:05:28Z

1

Managed to make it work :

I changed the project structure from

django-pytest
\_ django_pytest
  \_ django_pytest
  |_ library
  |_ tests
  |_ __init__.py
  |_ manage.py

to

django-pytest
\_ project_tets
  \_ django_pytest
  |_ library
  |_ tests
  |_ __init__.py
  |_ manage.py

I changed the imports in my tests from

from project_test.library.models import Book

to

from library.models import Book

These modifications don't seem much to me and I don't understand why they solved my problem.

Django create the structure of 2 packages with the same name, so I guess I'll have to systematicaly rename the parent one for pytest-django to work.

And bear with these linted import X)

answered Nov 10, 2023 at 11:05

JulienS

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