Isolated a flatpages test; refs #11505.

from __future__ import unicode_literals

from django.apps import apps

from django.contrib.sites.models import Site

from django.test import TestCase

from django.test.utils import modify_settings, override_settings

@modify_settings(INSTALLED_APPS={'append': ['django.contrib.sitemaps']},)

class FlatpagesSitemapTests(TestCase):

    @classmethod

    def setUpClass(cls):

        super(FlatpagesSitemapTests, cls).setUpClass()

        # This cleanup is necessary because contrib.sites cache

        # makes tests interfere with each other, see #11505

        Site.objects.clear_cache()

    @classmethod

    def setUpTestData(cls):

        Site = apps.get_model('sites.Site')