Used a django.test.TestCase for compatibility with @override_settings.

from django.core import urlresolvers

from django.template import loader

from django.template.loaders import app_directories, filesystem, cached

from django.test import RequestFactory

from django.test import RequestFactory, TestCase

from django.test.utils import (setup_test_template_loader,

    restore_template_loaders, override_settings)

from django.utils import unittest

        return 'ŠĐĆŽćžšđ'

@override_settings(MEDIA_URL="/media/", STATIC_URL="/static/")

class Templates(unittest.TestCase):

class Templates(TestCase):

    def test_loaders_security(self):

        ad_loader = app_directories.Loader()