Catch warnings as errors in pytest

.github/workflows/ci.yml

@@ -61,6 +61,8 @@ jobs:
         run: poetry run pre-commit run --all-files
 
       - name: Run Tests (Django ${{ steps.poetry-install.outputs.django_version }})
+        # enforce failing fast: https://docs.github.com/en/actions/using-workflows/workflow-syntax-for-github-actions#exit-codes-and-error-action-preference
+        shell: bash
         run: |
           poetry run pytest \
           --junitxml=pytest.xml \

pyproject.toml

@@ -54,6 +54,7 @@ asyncio_mode = "auto"
 addopts = [
     "--ds=tests.settings",         # Forces pytest-django to use test settings
     "--ignore-glob='*/models.py'",
+    "-W error",
 ]
 
 [tool.ruff]

tests/settings.py

@@ -112,8 +112,6 @@
 
 USE_I18N = True
 
-USE_L10N = True
-
 USE_TZ = True