Unit tests for TxSubmitterService

[Otaiki1]

Context

Submission failures must be handled and logged correctly.

Goal

Add tests for transaction building and submission.

Contributor guide

1. Directory: oracle/
2. Mock Soroban RPC submitTransaction.
3. Simulate success and various error codes (malformed, fee_too_low).
4. Verify retry logic is triggered on transient errors.
5. Verify signing call to KeyService.

References

• Stellar SDK submission testing.

[DSOTec]

@DSOTec has applied to work on this issue as part of the Stellar Wave Program's 3rd wave.

Hi, I would love to work on issue. Kindly assign

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

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