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# http://djangosnippets.org/snippets/1011/
from django.conf import settings
from django.core.management import call_command
from django.db.models import loading
from django.test import TestCase
NO_SETTING = ('!', None)
class TestSettingsManager(object):
"""
A class which can modify some Django settings temporarily for a
test and then revert them to their original values later.
Automatically handles resyncing the DB if INSTALLED_APPS is
modified.
"""
def __init__(self):
self._original_settings = {}
def set(self, **kwargs):
for k,v in kwargs.iteritems():
self._original_settings.setdefault(k, getattr(settings, k,
NO_SETTING))
setattr(settings, k, v)
if 'INSTALLED_APPS' in kwargs:
self.syncdb()
def syncdb(self):
loading.cache.loaded = False
call_command('syncdb', verbosity=0)
def revert(self):
for k,v in self._original_settings.iteritems():
if v == NO_SETTING:
delattr(settings, k)
else:
setattr(settings, k, v)
if 'INSTALLED_APPS' in self._original_settings:
self.syncdb()
self._original_settings = {}
class SettingsTestCase(TestCase):
"""
A subclass of the Django TestCase with a settings_manager
attribute which is an instance of TestSettingsManager.
Comes with a tearDown() method that calls
self.settings_manager.revert().
"""
def __init__(self, *args, **kwargs):
super(SettingsTestCase, self).__init__(*args, **kwargs)
self.settings_manager = TestSettingsManager()
def tearDown(self):
self.settings_manager.revert()
class TestModelsTestCase(SettingsTestCase):
def setUp(self, *args, **kwargs):
installed_apps = tuple(settings.INSTALLED_APPS) + ('djangorestframework.tests',)
self.settings_manager.set(INSTALLED_APPS=installed_apps)
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