Fixed #20032 -- Documented how to simulate the absence of a setting

    the original ``LoginTestCase`` is still equally affected by the

    decorator.

You can also simulate the absence of a setting by deleting it after settings

have been overriden, like this::

    @override_settings()

    def test_something(self):

        del settings.LOGIN_URL

        ...

When overriding settings, make sure to handle the cases in which your app's

code uses a cache or similar feature that retains state even if the

setting is changed. Django provides the