diff --git a/blockchain_integration/pi_network/tests/test_pi_network_db.py b/blockchain_integration/pi_network/tests/test_pi_network_db.py
index 758ac7237..7f985a065 100644
--- a/blockchain_integration/pi_network/tests/test_pi_network_db.py
+++ b/blockchain_integration/pi_network/tests/test_pi_network_db.py
@@ -1,13 +1,15 @@
 import unittest
+
 from pi_network.pi_network_db import PiNetworkDB
-from pi_network.utils.cryptographic_helpers import encrypt_data, decrypt_data
+from pi_network.utils.cryptographic_helpers import decrypt_data, encrypt_data
+
 
 class TestPiNetworkDB(unittest.TestCase):
     def setUp(self):
         self.pi_network_db = PiNetworkDB()
 
     def test_create_transaction(self):
-        transaction_data = {'amount': 10.99, 'ender': 'Alice', 'eceiver': 'Bob'}
+        transaction_data = {"amount": 10.99, "ender": "Alice", "eceiver": "Bob"}
         encrypted_data = encrypt_data(transaction_data)
         transaction_id = self.pi_network_db.create_transaction(encrypted_data)
         self.assertIsNotNone(transaction_id)
@@ -16,10 +18,12 @@ def test_get_transaction(self):
         transaction_id = 1
         encrypted_data = self.pi_network_db.get_transaction(transaction_id)
         decrypted_data = decrypt_data(encrypted_data)
-        self.assertEqual(decrypted_data, {'amount': 10.99, 'ender': 'Alice', 'eceiver': 'Bob'})
+        self.assertEqual(
+            decrypted_data, {"amount": 10.99, "ender": "Alice", "eceiver": "Bob"}
+        )
 
     def test_create_user(self):
-        user_data = {'username': 'Alice', 'password': 'password123'}
+        user_data = {"username": "Alice", "password": "password123"}
         encrypted_data = encrypt_data(user_data)
         user_id = self.pi_network_db.create_user(encrypted_data)
         self.assertIsNotNone(user_id)
@@ -28,11 +32,13 @@ def test_get_user(self):
         user_id = 1
         encrypted_data = self.pi_network_db.get_user(user_id)
         decrypted_data = decrypt_data(encrypted_data)
-        self.assertEqual(decrypted_data, {'username': 'Alice', 'password': 'password123'})
+        self.assertEqual(
+            decrypted_data, {"username": "Alice", "password": "password123"}
+        )
 
     def test_update_transaction(self):
         transaction_id = 1
-        updated_data = {'amount': 20.99, 'ender': 'Alice', 'eceiver': 'Bob'}
+        updated_data = {"amount": 20.99, "ender": "Alice", "eceiver": "Bob"}
         encrypted_data = encrypt_data(updated_data)
         self.pi_network_db.update_transaction(transaction_id, encrypted_data)
 
@@ -40,5 +46,6 @@ def test_delete_transaction(self):
         transaction_id = 1
         self.pi_network_db.delete_transaction(transaction_id)
 
-if __name__ == '__main__':
+
+if __name__ == "__main__":
     unittest.main()