gistfile1.py

## CALLING CODE

from django.conf import settings

def my_function():
    foo = getattr(settings, 'foo', None)
    if foo:
        return foo.BAR
        
    return BAZ
        
## TEST

def test_settings_dont_have_foo(self):
    with self.settings(## UNSET FOO ##):
        value = my_function()
        
    self.assertEquals(value, BAZ)