Add fuzz tests for `dispute_invoice`

[Levi-Ojukwu]

Description:

Acceptance Criteria:

• Property test that dispute flow never panics
• Test with random invoice IDs and reason hashes

Relevant Files: contracts/fuzz/src/lib.rs

---

[spiffamani]

I'm a full-stack Software Engineer
I'd love to take this on — thanks for considering me

[ekwe7]

I will love to work on this project

[Vraey-bit]

@Vraey-bit has applied to work on this issue as part of the Stellar Wave Program's 7th wave.

Hi Maintainer, thank you for opening this issue. After reviewing the requirements, I'm confident I can implement a clean, maintainable solution that meets the expected outcome. If assigned, I'll begin working on it right away.

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

[BigDella]

@BigDella has applied to work on this issue as part of the Stellar Wave Program's 7th wave.

i will love to wrk on this issue

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

[drips-wave]

Congratulations, @BigDella! 🎉 Your application was accepted by the repo's maintainers, and the issue is due on July 30, 2026.

🧑‍💻 @BigDella: 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.

🌊 Happy Wave 🌊

[drips-wave]

This issue has been completed by @BigDella as part of the Stellar Wave Program's 7th Wave 🥳

😎 @BigDella: You earned 200 Points for completing this issue! After the current Wave ends, you'll be eligible for a percentage of the Wave's reward pool based on the percentage of total points you've earned. Learn more here. You can also Leave a review to share your experience working on this issue.

🧑‍💻 Repo maintainers: How'd the contributor do? Leave a review to share your experience working with them.