test: Add integration test suite for bridge ↔ oracle cross-contract communication

[nanaf6203-bit]

Description

The bridge contract relies on oracle data for cross-chain trade settlement but there are no integration tests verifying the correctness of these interactions. We need end-to-end tests covering the full bridge+oracle lifecycle.

Acceptance Criteria

• Create integration test file in tests/ for bridge-oracle interactions
• Test: oracle valuation update triggers correct bridge fee recalculation
• Test: stale oracle prices cause bridge to reject trades with appropriate error
• Test: bridge operator can attach oracle data to cross-chain trade settlement
• Test: multiple oracle sources aggregation flows through to bridge quote
• Test: circuit breaker in oracle correctly blocks bridge trades
• All tests pass with cargo test --test bridge_oracle_integration
• Tests use mock oracle adapters for deterministic results

[Killerjunior]

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

Hi maintainer, I have read and understood the issue requirements and checked the necessary documentation. I’m confident I can work on this task effectively and deliver a proper solution.

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

[kuse-design]

@kuse-design has applied to work on this issue as part of the Stellar Wave Program's 6th wave.

i can work on this issue because am a software engineer and am capable

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

[delfinacorr]

@delfinacorr has applied to work on this issue as part of the Stellar Wave Program's 6th wave.

Hi,i am full stack developer and blockchain ,I would like to apply for this issue. I have experience writing integration test suites for smart contracts in Rust and I understand the critical importance of securing bridge-oracle communication in adverse scenarios.

My approach for the suite in tests/bridge_oracle_integration.rs will be:

Accurate simulations: Implement simulated oracle adapters (mock oracles) to ensure that tests are 100% deterministic during test runs.

Flow validation: Test the dynamic recalculation of fees after oracle updates and the correct aggregation of multiple data sources.

Critical error paths: Simulate key security scenarios such as operation rejections due to stale prices and the triggering of the circuit breaker to ensure the bridge blocks transactions with the correct errors.

Could you assign it to me? Thank you very much!

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

[drips-wave]

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

🧑‍💻 @delfinacorr: 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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