E2E Tests for Transaction Submission Flow

[Josue19-08]

🔖 Title

E2E Tests for Transaction Submission Flow

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📄 Description

Create end-to-end integration tests for the transaction submission and status tracking system. Mock Horizon API interactions. This issue can be completed independently once issues #62 and #63 are implemented.

Related to: Meta-issue #68

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✅ Tasks to complete

• Test transaction submission endpoint (POST /transactions/submit)
• Test XDR validation before submission
• Test transaction hash storage in database
• Test transaction status query endpoint (GET /transactions/:hash)
• Test status normalization (pending/success/failed)
• Test complete flow: submit → check pending → confirm → check success
• Test error scenarios (invalid XDR, submission failures)
• Test Horizon error mapping to user messages
• Verify database state changes (pending → success/failed)
• Mock Horizon API responses
• Test different transaction types (loan_create, loan_repay, deposit, withdraw)
• Clean up test data after tests

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📚 Documentation/context for AI

(This link never should removed)
https://github.com/TrustUp-app/TrustUp-API/tree/main/docs

Relevant documentation:

• https://github.com/TrustUp-app/TrustUp-API/blob/main/docs/development/testing-structure.md
• https://github.com/TrustUp-app/TrustUp-API/blob/main/docs/architecture/blockchain-layer.md

Dependencies:

• Issue Transaction Submission to Stellar Network #62 (Submit transaction) must be implemented
• Issue Transaction Status Query Endpoint #63 (Transaction status) must be implemented

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🗒️ Additional notes

Acceptance Criteria:

• All E2E tests pass
• Transaction submission flow works end-to-end
• Status transitions are validated
• Horizon API is properly mocked
• Error handling is comprehensive
• Database state is correctly updated
• Test data is cleaned up

[Cyberking99]

@Cyberking99 has applied to work on this issue as part of the Stellar Wave Program's 4th wave.

Hello,

I am a smart contract and full-stack developer interested in contributing to this issue. I am experienced with hands-on experience in Rust, Soroban, Go, Cairo, Solidity, and TypeScript.

I am passionate about building secure and scalable blockchain solutions, with a strong focus on writing clean, maintainable code. Based on the scope of this issue, I am confident I can deliver a complete solution within 24 hours of assignment.

I would appreciate the opportunity to contribute and help move this forward.

ℹ️ Repo Maintainers: To accept this application, review their application or assign @Cyberking99 to this issue.

[mrmoney10010-design]

@mrmoney10010-design has applied to work on this issue as part of the Stellar Wave Program's 4th wave.

I am applying to implement the E2E integration tests for transaction submission and status tracking. I will develop a comprehensive suite that mocks Horizon API interactions to validate the full flow—from XDR submission and DB storage to status normalization for all transaction types. My work will ensure robust error mapping, accurate state transitions, and clean test teardowns.

ℹ️ Repo Maintainers: To accept this application, review their application or assign @mrmoney10010-design to this issue.

[drips-wave]

Congratulations, @Cyberking99! 🎉 Your application was accepted by the repo's maintainers, and the issue is due on April 29, 2026.

🧑‍💻 @Cyberking99: 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 🌊