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