tests: make it possible to run without setting PYTHONPATH=$(pwd)

This makes just `pytest` run successfully.

docs/contributing.rst

@@ -163,7 +163,7 @@ but please don't include them in your pull requests.
 
 After this short initial setup you're ready to run tests::
 
-    $ COVERAGE_PROCESS_START=`pwd`/pyproject.toml COVERAGE_FILE=`pwd`/.coverage PYTHONPATH=`pwd` pytest --ds=pytest_django_test.settings_postgres
+    $ COVERAGE_PROCESS_START=`pwd`/pyproject.toml COVERAGE_FILE=`pwd`/.coverage pytest --ds=pytest_django_test.settings_postgres
 
 You should repeat the above step for sqlite and mysql before the next step.
 This step will create a lot of ``.coverage`` files with additional suffixes for

pyproject.toml

@@ -72,6 +72,7 @@ addopts = [
     # Show extra test summary info for everything.
     "-ra",
 ]
+pythonpath = ["."]
 DJANGO_SETTINGS_MODULE = "pytest_django_test.settings_sqlite_file"
 testpaths = ["tests"]
 markers = ["tag1", "tag2", "tag3", "tag4", "tag5"]

tests/conftest.py

@@ -1,6 +1,7 @@
 from __future__ import annotations
 
 import copy
+import os
 import pathlib
 import shutil
 from pathlib import Path
@@ -135,6 +136,11 @@ def django_pytester(
     shutil.copytree(str(app_source), str(test_app_path))
     tpkg_path.joinpath("the_settings.py").write_text(test_settings)
 
+    # For suprocess tests, pytest's `pythonpath` setting doesn't currently
+    # work, only the envvar does.
+    pythonpath = os.pathsep.join(filter(None, [str(REPOSITORY_ROOT), os.getenv("PYTHONPATH", "")]))
+    monkeypatch.setenv("PYTHONPATH", pythonpath)
+
     monkeypatch.setenv("DJANGO_SETTINGS_MODULE", "tpkg.the_settings")
 
     def create_test_module(test_code: str, filename: str = "test_the_test.py") -> Path:

tests/test_urls.py

@@ -3,6 +3,8 @@
 from django.urls import is_valid_path
 from django.utils.encoding import force_str
 
+from .helpers import DjangoPytester
+
 
 @pytest.mark.urls("pytest_django_test.urls_overridden")
 def test_urls() -> None:
@@ -16,19 +18,27 @@ def test_urls_client(client) -> None:
     assert force_str(response.content) == "Overridden urlconf works!"
 
 
-def test_urls_cache_is_cleared(pytester: pytest.Pytester) -> None:
-    pytester.makepyfile(
+@pytest.mark.django_project(
+    extra_settings="""
+    ROOT_URLCONF = "empty"
+    """,
+)
+def test_urls_cache_is_cleared(django_pytester: DjangoPytester) -> None:
+    django_pytester.makepyfile(
+        empty="""
+        urlpatterns = []
+        """,
         myurls="""
         from django.urls import path
 
         def fake_view(request):
             pass
 
         urlpatterns = [path('first', fake_view, name='first')]
-    """
+        """,
     )
 
-    pytester.makepyfile(
+    django_pytester.create_test_module(
         """
         from django.urls import reverse, NoReverseMatch
         import pytest
@@ -37,42 +47,47 @@ def fake_view(request):
         def test_something():
             reverse('first')
 
-
         def test_something_else():
             with pytest.raises(NoReverseMatch):
                 reverse('first')
-
-    """
+        """,
     )
 
-    result = pytester.runpytest_subprocess()
+    result = django_pytester.runpytest_subprocess()
     assert result.ret == 0
 
 
-def test_urls_cache_is_cleared_and_new_urls_can_be_assigned(pytester: pytest.Pytester) -> None:
-    pytester.makepyfile(
+@pytest.mark.django_project(
+    extra_settings="""
+    ROOT_URLCONF = "empty"
+    """,
+)
+def test_urls_cache_is_cleared_and_new_urls_can_be_assigned(
+    django_pytester: DjangoPytester,
+) -> None:
+    django_pytester.makepyfile(
+        empty="""
+        urlpatterns = []
+        """,
         myurls="""
         from django.urls import path
 
         def fake_view(request):
             pass
 
         urlpatterns = [path('first', fake_view, name='first')]
-    """
-    )
-
-    pytester.makepyfile(
+        """,
         myurls2="""
         from django.urls import path
 
         def fake_view(request):
             pass
 
         urlpatterns = [path('second', fake_view, name='second')]
-    """
+        """,
     )
 
-    pytester.makepyfile(
+    django_pytester.create_test_module(
         """
         from django.urls import reverse, NoReverseMatch
         import pytest
@@ -87,8 +102,8 @@ def test_something_else():
                 reverse('first')
 
             reverse('second')
-    """
+        """,
     )
 
-    result = pytester.runpytest_subprocess()
+    result = django_pytester.runpytest_subprocess()
     assert result.ret == 0

tox.ini

@@ -29,8 +29,6 @@ deps =
     xdist: pytest-xdist>=1.15
 
 setenv =
-    PYTHONPATH = {toxinidir}:{env:PYTHONPATH:}
-
     mysql_innodb: DJANGO_SETTINGS_MODULE=pytest_django_test.settings_mysql_innodb
     mysql_myisam: DJANGO_SETTINGS_MODULE=pytest_django_test.settings_mysql_myisam
     postgres:     DJANGO_SETTINGS_MODULE=pytest_django_test.settings_postgres