add testing notes

Author: nerrad

docs/testing/releases/460.md

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+## Testing notes and ZIP for release 4.4.0
+
+Zip file for testing: [woocommerce-gutenberg-products-block.zip](https://github.com/woocommerce/woocommerce-gutenberg-products-block/files/6064047/woocommerce-gutenberg-products-block.zip)
+
+## Feature plugin and package inclusion in WooCommerce core
+
+### General smoke testing
+
+The following are related to various changes impacting some existing flows so just need validated there's nothing broken:
+
+- Test that adding products to the cart via the add to cart button in the All Products block works as expected (product is added to cart and button updated accordingly).
+
+### Fix button styles in Twenty Nineteen Theme (#3862)
+
+* Insert all products block in a page.
+* View a product with a link (external product).
+* Verify the text in the button for the link is white on blue background.
+
+#### Screenshots
+
+Before:
+![Screenshot 2021-02-17 at 14 59 22](https://user-images.githubusercontent.com/90977/108222645-e2a89500-7130-11eb-8f50-9ccd7a987948.png)
+
+After:
+![Screenshot 2021-02-17 at 14 53 09](https://user-images.githubusercontent.com/90977/108222653-e3d9c200-7130-11eb-8cc9-1a9810df9c32.png)
+
+### Handle out of stock product visibility setting in All Products block (#3859)
+
+1. Add All products block to a page.
+2. Mark one product as `Out of stock`, and one as `On back order`.
+3. Select WC > Settings > Products > Inventory > Hide out of stock items from the catalog.
+4. Go to the frontend and view the page with the All products block on it. Verify that the `Out of stock` product is not showing, but the `On back order` product is visible.
+
+## Feature plugin only
+
+### Update Panel component class names to follow guidelines (#3860)
+
+1. Go to a page with the Cart and/or Checkout block inserted and verify there are no visual regressions. Pay special attention to elements that use the Panel component (Coupon code, shipping selector, order summary, etc).
+2. Verify there is no regressions in the Stripe payment method card icons (you will need the [Stripe Payment Method extension](https://woocommerce.com/products/stripe/) installed).
+
+### Remove shadows from text buttons and gradient background from selects in some themes (#3846)
+
+* Install and activate the [Bookshop](https://woocommerce.com/products/bookshop/) theme.
+* Go to the cart block output on the frontend and verify the `Delete item` button doesn't have text shadow.
+
+| Before | After |
+| --- | --- |
+| ![imatge](https://user-images.githubusercontent.com/3616980/107967337-4609ba00-6fad-11eb-9dd9-f4929f699bff.png) | ![imatge](https://user-images.githubusercontent.com/3616980/107967434-633e8880-6fad-11eb-9e7d-6dc21c8f3984.png) |
+
+* Go to the checkout block and verify Country and State selects don't have a gradient in the background.
+
+| Before | After |
+| --- | --- |
+| ![imatge](https://user-images.githubusercontent.com/3616980/107967156-1195fe00-6fad-11eb-95ca-d9379e7ff794.png) | ![imatge](https://user-images.githubusercontent.com/3616980/107967052-ef03e500-6fac-11eb-8a76-e2ac0a73ce46.png) |
+
+### Only use `SHOP_URL` if set (#3845)
+
+* In WC > Settings > Products, unset the shop page and save.
+* Insert a NEW cart block instance into a page.
+* Confirm the empty cart template does not include a link to browse the shop.
+
+
+### Smoke Testing
+
+The following are related to various changes impacting some existing flows so just need validated there's nothing broken
+
+- Cart and checkout coupons interaction works as expected.
+- Cart and checkout changing quantities works as expected.
+- Cart and checkout shipping interaction works as expected.
+- Cart and checkout express payment method works as expected.