Shopping cart

I have six feature files for this exercise:
1. add_quantity.feature: Add Products to Shopping Cart
2. change_quantity.feature: Change Quantity of Products in Shopping Cart
3. remove_quantity.feature: Remove Products from Shopping Cart
4. coupon.feature: Add Coupons to Shopping Cart
5. navigate_to_item_pages.feature: Navigate from Shopping Cart to Item Page
6. shipping_estimate.feature:  Obtain shipping estimates
does this scenario cover either of the following?

* customer tries to update the quantity of a product that is now completely out of stock -- for example, if he had a screswriver in his cart, but before he checked out someone else bought all the screwdrivers
  * actually, the above might be a completely separate scenario to consider testing
* there are still screwdrivers in stock (say, 10), but customer tries to add more screwdrivers than that (say 20). the message "that item is now out of stock" would then be misleading