add testing steps

Author: senadir

docs/testing/releases/742.md

@@ -0,0 +1,20 @@
+## Testing notes and ZIP for release 7.4.2
+
+[woocommerce-gutenberg-products-block.zip](https://github.com/woocommerce/woocommerce-gutenberg-products-block/files/8496130/woocommerce-gutenberg-products-block.zip)
+
+
+## Feature plugin and package inclusion in WooCommerce
+
+### Fix bug with server errors not showing in Cart/Checkout. ([6268](https://github.com/woocommerce/woocommerce-gutenberg-products-block/pull/6268))
+
+#### Checkout
+1. Create a Simple Product that is in stock.
+2. Add it to the cart.
+3. Navigate to the checkout block.
+4. Change the stock status to "Out of stock" and place the order. Ensure an error notice appears at the top of the Checkout block.
+
+#### Cart
+1. Create a Simple Product that is in stock.
+2. Add it to the cart.
+3. Change the stock status to "Out of stock" and refresh the page.
+4. Ensure a notice informing the customer that there is an out of stock product in the cart appears at the top of the block.

docs/testing/releases/README.md

@@ -66,6 +66,7 @@ Every release includes specific testing instructions for new features and bug fi
 -   [7.3.0](./730.md)
 -   [7.4.0](./740.md)
     -   [7.4.1](./741.md)
+    -   [7.4.2](./742.md)
 
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