Best way to tell if we're in a test

What's the best way to tell (from regular code) if we're in a test?  I have added extra authentication steps (security questions) that would be difficult to deal with in tests where you just want to run self.client.login() or post to the login URL.  I've noticed that several third party modules, such as django-digest and django-bcrypt, also disable parts of their functionality during testing like this:

from django.core import mail

if hasattr(mail, 'outbox'):
    # we are under a test
else:
    # not under a test

This works, but it's an undocumented side effect so I'm worried it might change in a future version.  What's the correct way to tell if we're in a test?

Thanks,
Jody

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