'Activation with a key that\'s expired should also make
``UserenaSignup.objects.activation_user`` return ``False``.'

def test_activation_expired(self):

    user = UserenaSignup.objects.create_user(**self.user_info)
    user.date_joined -= datetime.timedelta(days=(userena_settings.USERENA_ACTIVATION_DAYS + 1))
    user.save()
    UserenaSignup.objects.activate_user(user.userena_signup.activation_key)
    active_user = User.objects.get(username='alice')
    self.assertFalse(active_user.is_active)
    self.assertEqual(user.userena_signup.activation_key, active_user.userena_signup.activation_key)
