Preconditions:

• Added product with availability set to OFF
• Added product with stock number 0

Steps to reproduce:

1. Log in to storefront.
2. Go to /product-catalog
3. Verify 'Add to cart' button for products which are out of the stock.

Actual result:

See attached screenshots

Add to cart button is active for product which is out of the stock.

Expected result:

Add to cart button is deactivated.