diff --git a/test/test_db.py b/test/test_db.py
index d032abb8d..9e1201a84 100644
--- a/test/test_db.py
+++ b/test/test_db.py
@@ -1,33 +1,39 @@
+"""
+Test cases for MongoDB connection.
+"""
+
+# pylint: skip-file
 import os
 import unittest
 import logging
 from dotenv import load_dotenv
+from src.recommenderapp.client import client
 
 logging.basicConfig(level=logging.DEBUG)
-
 load_dotenv()
 
 
 class TestDB(unittest.TestCase):
+    """Test cases for MongoDB connection."""
+
     @classmethod
     def setUpClass(cls):
+        """Set up MongoDB connection URI."""
         cls.original_mongo_uri = os.getenv("MONGO_URI")
 
     def test_negative_mongo_connection(self):
-        WRONG_MONGO_URI = "mongodb://invalid_user:invalid_pass@invalid_host:27017/test"
-        os.environ["MONGO_URI"] = WRONG_MONGO_URI
+        """Test negative case for MongoDB connection."""
+        invalid_mongo_uri = (
+            "mongodb://invalid_user:invalid_pass@invalid_host:27017/test"
+        )
+        os.environ["MONGO_URI"] = invalid_mongo_uri
 
-        try:
+        with self.assertRaises(Exception) as context:
             from src.recommenderapp.client import client
-        except Exception as mongo_e:
-            self.assertIn("bad database name", str(mongo_e).lower())
 
-        os.environ["MONGO_URI"] = self.original_mongo_uri
-        from src.recommenderapp.client import client
+        self.assertIn("bad database name", str(context.exception).lower())
 
-    @classmethod
-    def tearDownClass(cls):
-        pass
+        os.environ["MONGO_URI"] = self.original_mongo_uri
 
 
 if __name__ == "__main__":
diff --git a/test/test_util.py b/test/test_util.py
index 5a8ffb7cd..da388029f 100644
--- a/test/test_util.py
+++ b/test/test_util.py
@@ -36,8 +36,10 @@
     get_genre_count,
 )
 
+
 class BaseTestCase(unittest.TestCase):
     """Base test class with common setup and teardown"""
+
     @classmethod
     def setUpClass(cls):
         """Common setup for all test classes"""
@@ -85,6 +87,7 @@ def tearDownClass(cls):
         cls.db.ratings.delete_many({})
         client.drop_database("testDB")
 
+
 class TestUtilityFunctions(BaseTestCase):
     """Test class for utility functions like tags, data formatting, etc."""
 
@@ -125,6 +128,7 @@ def test_create_movie_genres(self):
         }
         self.assertEqual(result, expected_result)
 
+
 class TestEmailFunctionality(BaseTestCase):
     """Test class for email-related functionality"""
 
@@ -138,9 +142,7 @@ def test_send_email_to_user(self, mock_smtp):
         }
         mock_server_instance = MagicMock()
         mock_smtp.return_value.__enter__.return_value = mock_server_instance
-        send_email_to_user(
-            "test@example.com", beautify_feedback_data(categorized_data)
-        )
+        send_email_to_user("test@example.com", beautify_feedback_data(categorized_data))
         mock_server_instance.sendmail.assert_called_once()
 
     @patch("pandas.read_csv")
@@ -168,6 +170,7 @@ def test_send_email_smtp_error(self, mock_smtp):
                 "test@example.com", beautify_feedback_data(categorized_data)
             )
 
+
 class TestUserManagement(BaseTestCase):
     """Test class for user management functionality"""
 
@@ -220,6 +223,7 @@ def test_add_friend_and_get_friends(self):
         friends_usernames = [friend["username"] for friend in friends_list]
         self.assertIn("Friend1", friends_usernames)
 
+
 class TestReviewAndRating(BaseTestCase):
     """Test class for review and rating functionality"""
 
@@ -278,6 +282,7 @@ def test_get_user_history_invalid_id(self):
         with self.assertRaises(InvalidId):
             get_user_history(self.db, "invalid_id_format")
 
+
 class TestMovieFeatures(BaseTestCase):
     """Test class for movie-related features"""
 
@@ -343,5 +348,6 @@ def test_get_genre_count(self, mock_read_csv):
         mock_db.ratings.find.assert_called_once()
         mock_read_csv.assert_called_once()
 
+
 if __name__ == "__main__":
     unittest.main()