django/tests/staticfiles_tests/test_utils.py

from django.contrib.staticfiles.utils import check_settings
from django.core.exceptions import ImproperlyConfigured
from django.test import SimpleTestCase, override_settings


class CheckSettingsTests(SimpleTestCase):

    @override_settings(DEBUG=True, MEDIA_URL='static/media/', STATIC_URL='static/')
    def test_media_url_in_static_url(self):
        msg = "runserver can't serve media if MEDIA_URL is within STATIC_URL."
        with self.assertRaisesMessage(ImproperlyConfigured, msg):
            check_settings()
        with self.settings(DEBUG=False):  # Check disabled if DEBUG=False.
            check_settings()