Add unit tests for optimistic update rollback restoring correct holdings state on transaction failure

[Chucks1093]

Summary

The optimistic buy update modifies the React Query cache immediately on submission. If the transaction fails, the cache must be rolled back to the exact state before the optimistic write. Unit tests should confirm the rollback restores the previous holding quantity without leaving the cache in a partially updated state.

Scope

• Seed the React Query cache with a holding of 2 keys for a creator
• Trigger a buy for 1 key and apply the optimistic update (cache should show 3)
• Simulate a transaction failure
• Assert the cache is rolled back to 2 keys, not 3
• Assert a second optimistic update after the rollback starts from the correct base of 2

Acceptance Criteria

• Cache shows updated quantity during optimistic window
• Cache rolled back to previous quantity on failure
• Rolled-back state is exactly the pre-optimistic snapshot, not a re-fetch result
• Subsequent optimistic updates after rollback use the correct base value

ETA: 12 hours

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Coordinate on Telegram

[odusanya03]

@odusanya03 has applied to work on this issue as part of the Stellar Wave Program's 7th wave.

​Hi maintainer, I would love to work on this issue. I can get started on it right away.

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[KorexOnchain]

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

Hey team I'll love to work on this issue thanks

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[Uche44]

@Uche44 has applied to work on this issue as part of the Stellar Wave Program's 7th wave.

Here's how I'd approach this problem:

I will add unit tests for the optimistic update flow to verify the React Query cache updates immediately, rolls back to the exact previous holdings state when a transaction fails, and correctly handles subsequent optimistic updates after the rollback. The tests will ensure the cache remains consistent without relying on a refetch.

I have experience testing React Query state management and optimistic updates, and I can implement comprehensive tests while following the project's existing testing patterns.

Let me handle this for you.

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[kelv1nh]

@kelv1nh has applied to work on this issue as part of the Stellar Wave Program's 7th wave.

Hi, I'm Kelvin Adejoh, a smart contract developer with experience building and auditing Solidity-based applications. I'd love to contribute to this issue and help deliver a clean, well-tested solution. I'll communicate progress clearly and ensure the implementation aligns with the project's standards. Looking forward to contributing!

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Congratulations, @kelv1nh! 🎉 Your application was accepted by the repo's maintainers, and the issue is due on July 30, 2026.

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[grantfox-oss]

🎉 This issue has been marked as completed on GrantFox as part of the Official Campaign | FWC26 campaign!

@kelv1nh's PR #592 was approved and merged by @Chucks1093.

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👏 Great work, @kelv1nh! Keep contributing to accesslayerorg.

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