def setup_django():
    import django
    from django.conf import settings
    if not settings.configured:
        settings.configure(
            DEBUG=True,
            DATABASES={
                'default': {
                    'ENGINE': 'django.db.backends.sqlite3',
                    'NAME': ':memory:',
                }
            },
            INSTALLED_APPS=(
                'django.contrib.admin',
                'django.contrib.auth',
                'django.contrib.contenttypes',
                'django.contrib.sessions',
                'django.contrib.messages',
                'django_ftpserver',
            )
        )
    django.setup()
    from django.apps import apps
    if not apps.ready:
        apps.populate() 

def mock_django_setup(settings_module, disabled_features=None):
    """ Must be called *AT IMPORT TIME* to pretend that Django is set up.

    This is useful for running tests without using the Django test runner.
    This must be called before any Django models are imported, or they will
    complain. Call this from a module in the calling project at import time,
    then be sure to import that module at the start of all mock test modules.
    Another option is to call it from the test package's init file, so it runs
    before all the test modules are imported.
    :param settings_module: the module name of the Django settings file,
        like 'myapp.settings'
    :param disabled_features: a list of strings that should be marked as
        *False* on the connection features list. All others will default
        to True.
    """
    if apps.ready:
        # We're running in a real Django unit test, don't do anything.
        return

    if 'DJANGO_SETTINGS_MODULE' not in os.environ:
        os.environ['DJANGO_SETTINGS_MODULE'] = settings_module
    django.setup()
    mock_django_connection(disabled_features) 

def model_unpickle(model_id, attrs, factory):
    """
    Used to unpickle Model subclasses with deferred fields.
    """
    if isinstance(model_id, tuple):
        if not apps.ready:
            apps.populate(settings.INSTALLED_APPS)
        model = apps.get_model(*model_id)
    else:
        # Backwards compat - the model was cached directly in earlier versions.
        model = model_id
    cls = factory(model, attrs)
    return cls.__new__(cls) 

def _django_setup():
    os.environ.setdefault('DJANGO_SETTINGS_MODULE', 'rssant.settings')
    if not apps.ready and not settings.configured:
        django.setup() 

def model_unpickle(model_id, attrs, factory):
    """
    Used to unpickle Model subclasses with deferred fields.
    """
    if isinstance(model_id, tuple):
        if not apps.ready:
            apps.populate(settings.INSTALLED_APPS)
        model = apps.get_model(*model_id)
    else:
        # Backwards compat - the model was cached directly in earlier versions.
        model = model_id
    cls = factory(model, attrs)
    return cls.__new__(cls) 

def check_debug():
    """Check that Django's template debugging is enabled.

    Django's built-in "template debugging" records information the plugin needs
    to do its work.  Check that the setting is correct, and raise an exception
    if it is not.

    Returns True if the debug check was performed, False otherwise
    """
    from django.conf import settings

    if not settings.configured:
        return False

    # I _think_ this check is all that's needed and the 3 "hasattr" checks
    # below can be removed, but it's not clear how to verify that
    from django.apps import apps
    if not apps.ready:
        return False

    # django.template.backends.django gets loaded lazily, so return false
    # until they've been loaded
    if not hasattr(django.template, "backends"):
        return False
    if not hasattr(django.template.backends, "django"):
        return False
    if not hasattr(django.template.backends.django, "DjangoTemplates"):
        raise DjangoTemplatePluginException("Can't use non-Django templates.")

    for engine in django.template.engines.all():
        if not isinstance(engine, django.template.backends.django.DjangoTemplates):
            raise DjangoTemplatePluginException(
                "Can't use non-Django templates."
            )
        if not engine.engine.debug:
            raise DjangoTemplatePluginException(
                "Template debugging must be enabled in settings."
            )

    return True 

def test_ready(self):
        """
        Tests the ready property of the master registry.
        """
        # The master app registry is always ready when the tests run.
        self.assertIs(apps.ready, True)
        # Non-master app registries are populated in __init__.
        self.assertIs(Apps().ready, True)