Is there any simple mechanism for overriding Django settings for a unit test? I have a manager on one of my models that returns a specific number of the latest objects. The number of objects it returns is defined by a NUM_LATEST setting.
This has the potential to make my tests fail if someone were to change the setting. How can I override the settings on
setUp() and subsequently restore them on
tearDown()? If that isn't possible, is there some way I can monkey patch the method or mock the settings?
EDIT: Here is my manager code:
Returns a specific number of the most recent public Articles as defined by
the NEWS_LATEST_MAX setting.
num_latest = getattr(settings, 'NEWS_NUM_LATEST', 10)
return super(LatestManager, self).get_query_set().filter(is_public=True)[:num_latest]
The manager uses
settings.NEWS_LATEST_MAX to slice the queryset. The
getattr() is simply used to provide a default should the setting not exist.
EDIT: This answer applies if you want to change settings for a small number of specific tests.
Since Django 1.4, there are ways to override settings during tests: https://docs.djangoproject.com/en/stable/topics/testing/tools/#overriding-settings
TestCase will have a
self.settings context manager, and there will also be an
@override_settings decorator that can be applied to either a test method or a whole
These features did not exist yet in Django 1.3.
If you want to change settings for all your tests, you'll want to create a separate settings file for test, which can load and override settings from your main settings file. There are several good approaches to this in the other answers; I have seen successful variations on both hspander's and dmitrii's approaches.