[TEST] : Add unit tests for leaderboard ranking utilities

[SujalMahapatra]

Description

The leaderboard ranking logic in scripts/sync-leaderboard.js currently lacks dedicated unit test coverage.

The functions:

• stableSortByScore()
• assignCompetitionRanks()

are responsible for determining leaderboard ordering and ranking behavior, but they are currently embedded inside the sync script and are not easily testable.

Proposed Changes

Refactor

Extract ranking utilities into a reusable module (for example: scripts/utils/ranking.js) or export them from the current file so they can be imported by tests.

Add Test Coverage

stableSortByScore()

• sorts users by score in descending order
• handles equal scores consistently
• preserves expected ordering for mixed scores
• verifies tiebreaker behavior

assignCompetitionRanks()

• assigns rank 1 to highest score
• assigns identical ranks for tied scores
• skips rank numbers correctly after ties
• handles empty datasets
• handles single-user datasets

Benefits

• Prevents regressions in leaderboard calculations
• Makes ranking behavior easier to maintain
• Improves confidence during future refactors
• Encourages separation of business logic from script execution

Notes

This is primarily a testing contribution and should not change existing leaderboard behavior.

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[SujalMahapatra]

Hi @codepvg ,

I would like to work on this issue.

My plan is to:

• Extract the leaderboard ranking utilities into a reusable/testable module.
• Add unit tests for stableSortByScore() and assignCompetitionRanks().
• Cover ranking, tie-handling, sorting order, and edge cases (empty and single-user datasets).

Could you please assign this issue to me?

Thank you!