[Fix] fix test cases - Githubissues

Description

Fix failed test cases.

Fix test cases that were failing. Rename sum to json_sum to be able to use sum method instead of for loop.

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[ ] All automated tests have passed successfully.
[ ] All manual tests have passed successfully.
[ ] Code has been reviewed by at least one other team member.
[ ] Code has been properly documented and commented as needed.
[ ] All new and existing code adheres to our project's coding standards.
[ ] All dependencies have been added or removed from the project's README or other documentation as needed.
[ ] Any relevant documentation or help files have been updated to reflect the changes made in this pull request.
[ ] Any necessary database migrations have been run.
[ ] Any relevant UI changes have been reviewed and approved by the UI/UX team.

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