fix issue #24366 - Updating cart quantity

[GDauer]

Description (*)

This Pull Request fix Updating cart quantity, causes wrong error message to be displayed when backorders is involved. Internal ticket MC-19752

Fixed Issues (if relevant)

1. Updating cart with quantity that results in error, causes wrong error message to be displayed when backorders involved. #24366: Updating cart with quantity that results in error, causes wrong error message to be displayed when backorders involved.

Manual testing scenarios (*)

1. Deploy 2.3-develop
2. Create a test Category
3. Create test product in test category.
4. Set the stock product to Qty = 10
5. Allows Backorders with Notify to the product
6. Set Max in cart = 30 in test product.
7. Go to frontend and add 10 items to cart
8. Verify no warning messages
9. Change quantity to 25 and Update cart
10. Verify backorder warning of 15 items backordered
11. Change quantity to 35 and Update cart

Questions or comments

Contribution checklist (*)

• Pull request has a meaningful description of its purpose
• All commits are accompanied by meaningful commit messages
• All new or changed code is covered with unit/integration tests (if applicable)
• All automated tests passed successfully (all builds are green)

[m2-assistant]

Hi @GDauer. Thank you for your contribution
Here is some useful tips how you can test your changes using Magento test environment.
Add the comment under your pull request to deploy test or vanilla Magento instance:

• @magento give me test instance - deploy test instance based on PR changes
• @magento give me 2.3-develop instance - deploy vanilla Magento instance

For more details, please, review the Magento Contributor Guide documentation.

[GDauer]

@magento give me test instance

[magento-engcom-team]

Hi @GDauer. Thank you for your request. I'm working on Magento instance for you

[magento-engcom-team]

Hi @GDauer, here is your new Magento instance.
Admin access: https://pr-24380.instances.magento-community.engineering/admin
Login: admin Password: 123123q

[gwharton]

@magento give me test instance

[magento-engcom-team]

Hi @gwharton. Thank you for your request. I'm working on Magento instance for you

[magento-engcom-team]

Hi @gwharton, here is your new Magento instance.
Admin access: https://pr-24380.instances.magento-community.engineering/admin
Login: admin Password: 123123q

[gwharton]

@GDauer Solution Looks good. Test failures need resolving though.

[magento-engcom-team]

Hi @rodrigowebjump, thank you for the review.
ENGCOM-5790 has been created to process this Pull Request
✳️ @rodrigowebjump, could you please add one of the following labels to the Pull Request?

Label	Description
Auto-Tests: Covered	All changes in Pull Request is covered by auto-tests
Auto-Tests: Not Covered	Changes in Pull Request requires coverage by auto-tests
Auto-Tests: Not Required	Changes in Pull Request does not require coverage by auto-tests

[magento-engcom-team]

@GDauer thank you for contributing. Please accept Community Contributors team invitation here to gain extended permissions for this repository.

[engcom-Delta]

✔️ QA passed

[m2-assistant]

Hi @GDauer, thank you for your contribution!
Please, complete Contribution Survey, it will take less than a minute.
Your feedback will help us to improve contribution process.