magento/magento2#: GraphQL. MergeCarts mutation. Add additional API-functional test cases

[atwixfirster]

Description (*)

PR adds API-functional test cases to cover the next exceptions of mergeCarts mutation:

• Required parameter "source_cart_id" is missing
• Required parameter "destination_cart_id" is missing

Related Pull Requests

Fixed Issues (if relevant)

1. magento/magento2#<issue_number>: Issue title

Manual testing scenarios (*)

1. ...
2. ...

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)

Thank you!

[m2-assistant]

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

[magento-engcom-team]

Hi @lenaorobei, thank you for the review.
ENGCOM-6870 has been created to process this Pull Request

[engcom-Bravo]

✔️ QA Passed

Tests are added and pass

[m2-assistant]

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