test: multiple markets — funding rates are independent and do not bleed across markets

[abayomicornelius]

Goal

Verify that funding rate state for ETH/USD market does not affect or contaminate the BTC/USD market funding state.

Scenario

1. Create ETH/USD market (long-heavy: 80% long OI)
2. Create BTC/USD market (balanced: 50/50 OI)
3. Advance 100 ledgers
4. Update funding state for both markets
5. Open a long position in ETH/USD — assert large funding debit
6. Open a long position in BTC/USD — assert near-zero funding (balanced market)

Assertions

• ETH/USD funding_amount_per_size accumulates significantly
• BTC/USD funding_amount_per_size remains near 0
• No cross-market state leakage in data_store

Acceptance Criteria

• Test uses two separate market addresses throughout
• Data store keys are market-scoped (verified by checking raw storage)
• File: tests/multi_market_funding_isolation.rs

[Hassanmovic98]

I'll write an integration test that verifies funding rates for ETH/USD don't bleed into BTC/USD. Create both markets, advance the ledger, then open longs in each and assert the funding amounts are independent.

ETH/USD (80% long OI) should accumulate heavy funding debit. BTC/USD (50/50 balanced) stays near zero. Verify the data store keys are market-scoped so there's no cross-contamination.

Test covers the scenario end-to-end and catches any state leakage between markets.

[opratem]

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

I'd like to work on this issue because it verifies a critical correctness property for multi-market trading systems: ensuring market-specific funding state remains fully isolated. Any state leakage between markets could result in incorrect funding calculations and undermine confidence in the protocol.

I have experience contributing to blockchain projects involving escrow, transaction workflows, and comprehensive test development. I'm comfortable writing deterministic tests that validate state transitions, isolate edge cases, and verify storage behavior to prevent subtle regressions.

For this task, I'll create a test that initializes separate ETH/USD and BTC/USD markets with different open interest distributions, advances the ledger, updates funding for each market independently, and verifies that the resulting funding rates match the expected behavior. I'll also inspect the underlying storage to confirm funding state is scoped by market address and that no data leaks between markets.

I'm confident I can deliver a clear, well-structured test that strengthens confidence in the protocol's multi-market funding logic while guarding against future regressions.

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