Fixed #32915 -- Refactored runserver command to restore traceback

The traceback for `runserver --nostatic` with broken/missing
    settings was hidden because the custom runserver command which
    added `--nostatic` to the command args was only instantiated if
    the settings had no errors.

django/contrib/staticfiles/management/commands/runserver.py

@@ -1,36 +0,0 @@
-from django.conf import settings
-from django.contrib.staticfiles.handlers import StaticFilesHandler
-from django.core.management.commands.runserver import Command as RunserverCommand
-
-
-class Command(RunserverCommand):
-    help = (
-        "Starts a lightweight web server for development and also serves static files."
-    )
-
-    def add_arguments(self, parser):
-        super().add_arguments(parser)
-        parser.add_argument(
-            "--nostatic",
-            action="store_false",
-            dest="use_static_handler",
-            help="Tells Django to NOT automatically serve static files at STATIC_URL.",
-        )
-        parser.add_argument(
-            "--insecure",
-            action="store_true",
-            dest="insecure_serving",
-            help="Allows serving static files even if DEBUG is False.",
-        )
-
-    def get_handler(self, *args, **options):
-        """
-        Return the static files serving handler wrapping the default handler,
-        if static files should be served. Otherwise return the default handler.
-        """
-        handler = super().get_handler(*args, **options)
-        use_static_handler = options["use_static_handler"]
-        insecure_serving = options["insecure_serving"]
-        if use_static_handler and (settings.DEBUG or insecure_serving):
-            return StaticFilesHandler(handler)
-        return handler

django/core/management/commands/runserver.py

@@ -6,6 +6,7 @@ import sys
 from datetime import datetime
 
 from django.conf import settings
+from django.contrib.staticfiles.handlers import StaticFilesHandler
 from django.core.management.base import BaseCommand, CommandError
 from django.core.servers.basehttp import WSGIServer, get_internal_wsgi_application, run
 from django.db import connections
@@ -65,6 +66,18 @@ class Command(BaseCommand):
             action="store_true",
             help="Skip system checks.",
         )
+        parser.add_argument(
+            "--nostatic",
+            action="store_false",
+            dest="use_static_handler",
+            help="Tells Django to NOT automatically serve static files at STATIC_URL.",
+        )
+        parser.add_argument(
+            "--insecure",
+            action="store_true",
+            dest="insecure_serving",
+            help="Allows serving static files even if DEBUG is False.",
+        )
 
     def execute(self, *args, **options):
         if options["no_color"]:
@@ -75,8 +88,18 @@ class Command(BaseCommand):
         super().execute(*args, **options)
 
     def get_handler(self, *args, **options):
-        """Return the default WSGI handler for the runner."""
-        return get_internal_wsgi_application()
+        """
+        Return the default WSGI handler for the runner, or `StaticFilesHandler` if
+        either of --nostatic/--insecure is passed
+        """
+        handler = get_internal_wsgi_application()
+
+        use_static_handler = options["use_static_handler"]
+        insecure_serving = options["insecure_serving"]
+        if use_static_handler and (settings.DEBUG or insecure_serving):
+            handler = StaticFilesHandler(handler)
+
+        return handler
 
     def handle(self, *args, **options):
         if not settings.DEBUG and not settings.ALLOWED_HOSTS:

tests/admin_scripts/tests.py

@@ -30,7 +30,13 @@ from django.core.management.commands.runserver import Command as RunserverComman
 from django.core.management.commands.testserver import Command as TestserverCommand
 from django.db import ConnectionHandler, connection
 from django.db.migrations.recorder import MigrationRecorder
-from django.test import LiveServerTestCase, SimpleTestCase, TestCase, override_settings
+from django.test import (
+    LiveServerTestCase,
+    RequestFactory,
+    SimpleTestCase,
+    TestCase,
+    override_settings,
+)
 from django.test.utils import captured_stderr, captured_stdout
 from django.urls import path
 from django.utils.version import PY313
@@ -1695,6 +1701,23 @@ class ManageRunserver(SimpleTestCase):
         self.assertIn("Performing system checks...", self.output.getvalue())
         mocked_check.assert_called()
 
+    @override_settings(MIDDLEWARE=["django.middleware.common.CommonMiddleware"])
+    def test_middleware_loaded_only_once(self):
+        with mock.patch("django.middleware.common.CommonMiddleware") as mocked:
+            self.cmd.get_handler(use_static_handler=True, insecure_serving=True)
+            self.assertEqual(mocked.call_count, 1)
+
+    def test_404_response(self):
+        handler = self.cmd.get_handler(use_static_handler=True, insecure_serving=True)
+        missing_static_file = os.path.join(settings.STATIC_URL, "unknown.css")
+        req = RequestFactory().get(missing_static_file)
+        with override_settings(DEBUG=False):
+            response = handler.get_response(req)
+            self.assertEqual(response.status_code, 404)
+        with override_settings(DEBUG=True):
+            response = handler.get_response(req)
+            self.assertEqual(response.status_code, 404)
+
 
 class ManageRunserverMigrationWarning(TestCase):
     def setUp(self):

tests/settings_tests/tests.py

@@ -338,6 +338,12 @@ class SettingsTests(SimpleTestCase):
         with self.assertRaisesMessage(ValueError, "Incorrect timezone setting: test"):
             settings._setup()
 
+    def test_import_non_existing_module(self):
+        exc = ModuleNotFoundError("No module named 'fake_module'", name="fake_module")
+        with mock.patch("importlib.import_module", side_effect=exc):
+            with self.assertRaisesMessage(ImportError, "No module named 'fake_module'"):
+                Settings("fake_settings_module")
+
 
 class TestComplexSettingOverride(SimpleTestCase):
     def setUp(self):

tests/staticfiles_tests/test_management.py

@@ -11,11 +11,11 @@ from admin_scripts.tests import AdminScriptTestCase
 
 from django.conf import STATICFILES_STORAGE_ALIAS, settings
 from django.contrib.staticfiles import storage
-from django.contrib.staticfiles.management.commands import collectstatic, runserver
+from django.contrib.staticfiles.management.commands import collectstatic
 from django.core.exceptions import ImproperlyConfigured
 from django.core.management import CommandError, call_command
 from django.core.management.base import SystemCheckError
-from django.test import RequestFactory, override_settings
+from django.test import override_settings
 from django.test.utils import extend_sys_path
 from django.utils._os import symlinks_supported
 from django.utils.functional import empty
@@ -33,27 +33,6 @@ class TestNoFilesCreated:
         self.assertEqual(os.listdir(settings.STATIC_ROOT), [])
 
 
-class TestRunserver(StaticFilesTestCase):
-    @override_settings(MIDDLEWARE=["django.middleware.common.CommonMiddleware"])
-    def test_middleware_loaded_only_once(self):
-        command = runserver.Command()
-        with mock.patch("django.middleware.common.CommonMiddleware") as mocked:
-            command.get_handler(use_static_handler=True, insecure_serving=True)
-            self.assertEqual(mocked.call_count, 1)
-
-    def test_404_response(self):
-        command = runserver.Command()
-        handler = command.get_handler(use_static_handler=True, insecure_serving=True)
-        missing_static_file = os.path.join(settings.STATIC_URL, "unknown.css")
-        req = RequestFactory().get(missing_static_file)
-        with override_settings(DEBUG=False):
-            response = handler.get_response(req)
-            self.assertEqual(response.status_code, 404)
-        with override_settings(DEBUG=True):
-            response = handler.get_response(req)
-            self.assertEqual(response.status_code, 404)
-
-
 class TestFindStatic(TestDefaults, CollectionTestCase):
     """
     Test ``findstatic`` management command.