Overriding settings in Django tests

gistfile1.py

class SettingsContextManager(object):
    """Allow to change ``settings.*`` in ``with`` context."""
    def __init__(self, *settings_tuples):
        self.settings = dict(settings_tuples)
        self.orig_settings = dict([(key, getattr(settings, key))
                                   for key in self.settings])

    def __enter__(self, *args, **kwargs):
        [setattr(settings, key, self.settings[key])
         for key in self.settings]

    def __exit__(self, *args, **kwargs):
        [setattr(settings, key, self.orig_settings[key])
         for key in self.settings]


def patch_settings(*settings_tuples):
    """Patch ``settings`` inside ``with`` context.                                 
    INPUT:                                                                         
            *settings_tuples    one or several tuples                              
                                representing (setting_name, value)                 
                                                                                   
    """
    return SettingsContextManager(*settings_tuples)


def with_settings(**settings_dict):
    """Decorator for executing function within given ``settings`` context.         
    Example: @with_settings(CELERY_ALWAYS_EAGER=False)                             
                                                                                   
    """
    def wrap(func):
        def wrapper(self, *args, **kwargs):
            with patch_settings(*settings_dict.items()):
                result = func(self, *args, **kwargs)
            return result
        return wrapper
    return wrap