#14663 Updating Customer through rest/all/V1/customers/:id resets group_id if group_id not passed in payload

[MaxRomanov4669]

Description (*)

While updating customer through api customer group is changed to 1 if there no customer group in the body

Fixed Issues (if relevant)

#14663

Manual testing scenarios (*)

1. Update any customer who's group_id isn't the first group_id in the source list
2. Pass the customer payload with email, firstname, lastname, website_id, id

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]

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[magento-engcom-team]

Hi @VladimirZaets, thank you for the review.
ENGCOM-6500 has been created to process this Pull Request
✳️ @VladimirZaets, 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

[engcom-Charlie]

Hi @MaxRomanov4669

Due to Magento Definition of Done all code must be covered by tests. Please cover your fix by automated tests.

Thanks!

[MaxRomanov4669]

Hi @VladimirZaets @engcom-Charlie
Can you please clarify/help how can I cover my fix with tests?
function setCustomerGroupId - private function.
$customerModel - created inside save function
$customerArr - created inside save function
$prevCustomerDataArr - created inside save function

Thanks!

[engcom-Golf]

All changes covered by unit test

[engcom-Delta]

✔️ QA passed

[engcom-Golf]

Functional test fails on 2.4-develop branch, fix in -> #26225

[m2-assistant]

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