Added check_apps_ready() to Apps.get_containing_app_config()

        Returns the app config for the inner application in case of nesting.

        Returns None if the object isn't in any registered app config.

        """

        # In Django 1.7 and 1.8, it's allowed to call this method at import

        # time, even while the registry is being populated. In Django 1.9 and

        # later, that should be forbidden with `self.check_apps_ready()`.

        self.check_apps_ready()

        candidates = []

        for app_config in self.app_configs.values():

            if object_name.startswith(app_config.name):

from django.apps import AppConfig, apps

from django.apps.registry import Apps

from django.contrib.admin.models import LogEntry

from django.core.exceptions import ImproperlyConfigured

from django.core.exceptions import AppRegistryNotReady, ImproperlyConfigured

from django.db import models

from django.test import TestCase, override_settings

from django.test.utils import extend_sys_path

                "Conflicting 'southponies' models in application 'apps':.*"):

            type(str("SouthPonies"), (models.Model,), body)

    def test_get_containing_app_config_apps_not_ready(self):

        """

        apps.get_containing_app_config() should raise an exception if

        apps.apps_ready isn't True.

        """

        apps.apps_ready = False

        try:

            with self.assertRaisesMessage(AppRegistryNotReady, "Apps aren't loaded yet"):

                apps.get_containing_app_config('foo')

        finally:

            apps.apps_ready = True

class Stub(object):

    def __init__(self, **kwargs):