diff --git a/matemat/db/test/test_facade.py b/matemat/db/test/test_facade.py
index 6913d68..04c0eb4 100644
--- a/matemat/db/test/test_facade.py
+++ b/matemat/db/test/test_facade.py
@@ -145,11 +145,18 @@ class DatabaseTest(unittest.TestCase):
         with self.db as db:
             agent = db.create_user('admin', 'supersecurepassword', 'admin@example.com', True, True)
             user = db.create_user('testuser', 'supersecurepassword', 'testuser@example.com', True, True)
-            db.change_user(user, agent, email='newaddress@example.com', is_admin=False, is_member=False)
-            checkuser = db.login('testuser', 'supersecurepassword')
-            self.assertEqual('newaddress@example.com', checkuser.email)
+            db.change_user(user, agent, email='newaddress@example.com', is_admin=False, is_member=False, balance=4200)
+            # Changes must be reflected in the passed user object
+            self.assertEqual('newaddress@example.com', user.email)
+            self.assertFalse(user.is_admin)
+            self.assertFalse(user.is_member)
+            self.assertEqual(4200, user.balance)
+            # Changes must be reflected in the database
+            checkuser = db.get_user(user.id)
+            self.assertEqual('newaddress@example.com', user.email)
             self.assertFalse(checkuser.is_admin)
             self.assertFalse(checkuser.is_member)
+            self.assertEqual(4200, checkuser.balance)
             user._user_id = -1
             with self.assertRaises(DatabaseConsistencyError):
                 db.change_user(user, agent, is_member='True')
@@ -219,14 +226,18 @@ class DatabaseTest(unittest.TestCase):
     def test_change_product(self) -> None:
         with self.db as db:
             product = db.create_product('Club Mate', 200, 200)
-            product.name = 'Flora Power Mate'
-            product.price_member = 150
-            product.price_non_member = 250
-            db.change_product(product)
-            checkproduct = db.list_products()[0]
+            db.change_product(product, name='Flora Power Mate', price_member=150, price_non_member=250, stock=42)
+            # Changes must be reflected in the passed object
+            self.assertEqual('Flora Power Mate', product.name)
+            self.assertEqual(150, product.price_member)
+            self.assertEqual(250, product.price_non_member)
+            self.assertEqual(42, product.stock)
+            # Changes must be reflected in the database
+            checkproduct = db.get_product(product.id)
             self.assertEqual('Flora Power Mate', checkproduct.name)
             self.assertEqual(150, checkproduct.price_member)
             self.assertEqual(250, checkproduct.price_non_member)
+            self.assertEqual(42, checkproduct.stock)
             product._product_id = -1
             with self.assertRaises(DatabaseConsistencyError):
                 db.change_product(product)