Issue 37: Soroban RPC client tests with fixture JSON responses

[Nanle-code]

Labels: testing, soroban

Description:
Add golden-file tests for parsing in src/utils/soroban.rs.

Acceptance criteria:

Fixtures under tests/fixtures/soroban_rpc/.
Coverage for inspect + simulate response shapes.
Files:

src/utils/soroban.rs
tests/fixtures/soroban_rpc/

[DeveloperEmmy]

@DeveloperEmmy has applied to work on this issue as part of the Stellar Wave Program's 5th wave.

I’d like to work on this because reliable RPC parsing is essential for stable Soroban integrations. I’ve written fixture-based and golden-file tests for API clients, including Rust serialization/deserialization flows, response validation, and edge-case coverage to ensure consistent behavior across evolving blockchain RPC response formats.

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[drips-wave]

Congratulations, @DeveloperEmmy! 🎉 Your application was accepted by the repo's maintainers, and the issue is due on June 2, 2026.

🧑‍💻 @DeveloperEmmy: 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.

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[drips-wave]

This issue has been completed by @DeveloperEmmy as part of the Stellar Wave Program's 5th Wave 🥳

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