Increase Test Coverage for Edge Cases

[Mkalbani]

Acceptance Criteria

• Add tests for expired quests, duplicate joins, zero rewards, and unauthorized actions.
• Coverage should significantly improve.
• CI pipeline must pass successfully.

[gerani1]

@gerani1 has applied to work on this issue as part of the Stellar Wave Program's 5th wave.

hello, working on this will be fast, can i get assigned

ℹ️ Repo Maintainers: To accept this application, review their application or assign @gerani1 to this issue.

[ayshadogo]

@ayshadogo has applied to work on this issue as part of the Stellar Wave Program's 5th wave.

Hello Maintainer

I would like to work on this please

ℹ️ Repo Maintainers: To accept this application, review their application or assign @ayshadogo to this issue.

[drips-wave]

Congratulations, @ayshadogo! 🎉 Your application was accepted by the repo's maintainers, and the issue is due on June 2, 2026.

🧑‍💻 @ayshadogo: Please resolve the issue such that the repo's maintainers have enough time to review your contribution before the due date. You'll earn Points for completing the issue on-time, which will make you eligible for a share of the Stellar Wave Program's reward pool.

Warning

When opening a PR, please link it to this issue to ensure it gets tracked accurately. Points are awarded when this issue is marked as completed by the maintainer.

🤠 Repo maintainers: Please keep an eye on the contributor's progress and review their work before the due date. You can manage this issue, including adjusting its complexity and points, here.

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