Fixed #23933 -- Made override_settings(DATABASE_ROUTERS) affect the master router.

import warnings

from django.conf import settings

from django.db import connections

from django.db import connections, router

from django.db.utils import ConnectionRouter

from django.dispatch import receiver, Signal

from django.utils import timezone

from django.utils.functional import empty

            conn.cursor().execute(tz_sql, [tz])

@receiver(setting_changed)

def clear_routers_cache(**kwargs):

    if kwargs['setting'] == 'DATABASE_ROUTERS':

        router.routers = ConnectionRouter().routers

@receiver(setting_changed)

def reset_default_template_engine(**kwargs):

    if kwargs['setting'] in {

  for Oracle: :setting:`DATAFILE`, :setting:`DATAFILE_TMP`,

  :setting:`DATAFILE_MAXSIZE` and :setting:`DATAFILE_TMP_MAXSIZE`.

* The :func:`~django.test.override_settings` decorator can now affect the

  master router in :setting:`DATABASE_ROUTERS`.

Validators

^^^^^^^^^^

from django.conf.urls import url

from django.core.files.storage import default_storage

from django.core.urlresolvers import NoReverseMatch, reverse

from django.db import connection

from django.db import connection, router

from django.forms import EmailField, IntegerField

from django.http import HttpResponse

from django.template.loader import render_to_string

        self.assertIsNone(default_storage.directory_permissions_mode)

        with self.settings(FILE_UPLOAD_DIRECTORY_PERMISSIONS=0o777):

            self.assertEqual(default_storage.directory_permissions_mode, 0o777)

    def test_override_database_routers(self):

        """

        Overriding DATABASE_ROUTERS should update the master router.

        """

        test_routers = (object(),)

        with self.settings(DATABASE_ROUTERS=test_routers):

            self.assertSequenceEqual(router.routers, test_routers)