Stop using nosetests

Nose is no longer maintained and is incompatible with Python 3.10, so
can no longer be used. This change runs `coverage` manually to collect
coverage and uses `pytest` to run doctests, collectively covering what
was tested using django_nose.

demo/demoproject/settings.py

@@ -53,8 +53,6 @@ INSTALLED_APPS = (
     "django.contrib.sites",
     "django.contrib.messages",
     "django.contrib.staticfiles",
-    # Stuff that must be at the end.
-    "django_nose",
 )
 
 
@@ -111,15 +109,6 @@ DOWNLOADVIEW_RULES += [
 
 # Test/development settings.
 DEBUG = True
-TEST_RUNNER = "django_nose.NoseTestSuiteRunner"
-NOSE_ARGS = [
-    "--verbosity=2",
-    "--no-path-adjustment",
-    "--nocapture",
-    "--all-modules",
-    "--with-coverage",
-    "--with-doctest",
-]
 
 
 TEMPLATES = [

demo/setup.py

@@ -21,6 +21,6 @@ setup(
     packages=["demoproject"],
     include_package_data=True,
     zip_safe=False,
-    install_requires=["django-downloadview", "django-nose"],
+    install_requires=["django-downloadview", "pytest-django"],
     entry_points={"console_scripts": ["demo = demoproject.manage:main"]},
 )

tox.ini

@@ -27,11 +27,16 @@ deps =
     dj31: Django>=3.1,<3.2
     dj32: Django>=3.2,<3.3
     djmain: https://github.com/django/django/archive/main.tar.gz
-    nose
+    pytest
+    pytest-cov
 commands =
     pip install -e .
     pip install -e demo
-    python -Wd {envbindir}/demo test --cover-package=django_downloadview --cover-package=demoproject --cover-xml {posargs: tests demoproject}
+    # doctests
+    pytest --cov=django_downloadview --cov=demoproject {posargs}
+    # all other test cases
+    coverage run --append {envbindir}/demo test {posargs: tests demoproject}
+    coverage xml
     pip freeze
 ignore_outcome =
     djmain: True
@@ -65,3 +70,10 @@ commands =
 [flake8]
 max-line-length = 88
 ignore = E203, W503
+
+[coverage:run]
+source = django_downloadview,demo
+
+[pytest]
+DJANGO_SETTINGS_MODULE = demoproject.settings
+addopts = --doctest-modules --ignore=docs/