fixup! WIP

tests/queries/test_product_price.py

@@ -386,7 +386,9 @@ def test_product_price_joint_transactions(sql_session: Session) -> None:
 
     old_product_price = product_price_
     product_price_ = product_price(sql_session, product)
-    assert product_price_ == old_product_price, "Joint buy transactions should not affect product price"
+    assert product_price_ == old_product_price, (
+        "Joint buy transactions should not affect product price"
+    )
 
     transactions = [
         Transaction.add_product(

tests/queries/test_product_stock.py

@@ -140,6 +140,7 @@ def test_negative_product_stock(sql_session: Session) -> None:
     # The stock should be negative because we added and bought the product
     assert product_stock(sql_session, product) == 1 - 2 - 1
 
+
 def test_product_stock_joint_transaction(sql_session: Session) -> None:
     insert_test_data(sql_session)