[Python] How to mock settings in Django Unit testing

I am new to Django Unit testing and am trying to write unit test for a simple function which is like below:

utils.py
#some import statements
from django.conf import settings

if platform.system() == 'Linux':
cx_Oracle.init_oracle_client(lib_dir=settings.GAP_DB_LIB_DIR)
else:
cx_Oracle.init_oracle_client(lib_dir=settings.LOCAL_DB_LIB_DIR)
db_password = settings.DB_PASS
db_user = settings.DB_USER
db_connection_dsn = settings.DB_CONNECTION_DSN

def project(repo):
pieces = parse.urlsplit(repo)
return pieces.path.rstrip('/').split('/')[-1]


I am writing unit tests in test.py fie as below

from django.test import TestCase
from common import utils
from utils import project
from django.test import override_settings

# Create your tests here.
class UtilsTest(TestCase):
def setUp(self):
self.repo = "http://test/testrepo"

@override_settings(LOCAL_DB_LIB_DIR="c:/testdir")
def test_project(self):
response = utils.project(self.repo)
self.assertEqual(response,"testrepo")


When I run tests am getting below error: AttributeError: 'Settings' object has no attribute 'LOCAL_DB_LIB_DIR' Please help me where I am doing wrong and correct my coding. Thanks in advance.

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