override_drf_settings.py

def find_api_views(urls, views=None):
    if views is None:
        views = []
    for entry in urls:
        if hasattr(entry, 'url_patterns'):
            views.extend(find_api_views(entry.url_patterns))
        else:
            view = entry.callback
            if (
                hasattr(view, 'cls') and
                issubclass(view.cls, APIView)
            ):
                views.append(view)
    return views
drf_views = find_api_views(urlpatterns)


@contextmanager
def override_drf_settings(**kwargs):
    old_settings = defaultdict(dict)
    for key, value in kwargs.items():
        attr = key[len('DEFAULT_'):].lower()
        for view in drf_views:
            old_settings[view.func_name][attr] = getattr(view.cls, attr)
            setattr(view.cls, attr, value)
    yield
    for key, value in kwargs.items():
        attr = key[len('DEFAULT_'):].lower()
        for view in drf_views:
            setattr(view.cls, attr, old_settings[view.func_name][attr])


class DRFSettings(object):
    def drf_settings(self, **kwargs):
        return override_drf_settings(**kwargs)


class LiveServerTestCase(DRFSettings, BaseLiveServerTestCase):
    def test_foo(self):
        with self.drf_settings(DEFAULT_AUTHENTICATION_CLASSES=()):
            # stuff