API Integration Testing for Exchange Core

Опубликовано: 06 Февраль 2026
на канале: Vincent

In financial and exchange systems, Accuracy is the lifeline. Facing complex multi-dimensional scenarios involving matching, settlement, and position changes, manual testing is no longer sufficient to cover all edge cases. This video shares how to design an automated integration testing system to ensure that the core trading logic remains rock-solid after every iteration.

🚀 GitHub Project: https://github.com/vincentf13/open.vincentf13
🚀 Distributed Transactions Video: https://studio.youtube.com/video/R9S6...

🔹 Why Integration Testing is Essential:
Due to the distributed architecture, unit tests struggle to cover "End-to-End" scenarios. Automated integration testing simulates real order flows to verify collaboration between services and asset consistency.

🔹 Five Key Testing Dimensions:
1. Position Status: Covering opening, reducing, adding, closing, and Flip (reverse opening).
2. Execution Identity: Verifying settlement accuracy under different Taker and Maker rates.
3. Order Direction: Ensuring symmetry between Long and Short position logics.
4. Quantity Splitting: Simulating complex scenarios where a large order is filled by multiple small orders.
5. Price Fluctuations: Testing asset freezing and release under various matching price levels.

🔹 Critical Testing Scenarios:
Flip Concurrency & Resource Stealing: Simulating scenarios where a position is pre-frozen, but a new order requires immediate execution for a reverse open.
Debit-Credit Balance Audit: Automatically verifying if the accounts, positions, and logs of users A, B, and C adhere to the principle of double-entry equality after every trade.
Idempotency & Latency Handling: Resolving testing delays caused by Kafka transactions and asynchronous event streams.

🔹 Practical Walkthrough:
TradeTest Code Dive: How to reset the environment, log in to test accounts, and execute 10+ core scenarios.
Debugging Tips: Using breakpoints to verify position costs and margin calculation formulas step-by-step.
Troubleshooting: Resolving common test failures like Kafka Connect subscription timeouts and network latency tuning.

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⏱️ Timestamps
00:00:01 – Why financial systems MUST have Automated Integration Testing ?
00:01:28 – Analysis of the five variable dimensions and testing complexity in trading flows.
00:03:39 – Test Case Design: Three-account (A/B/C) simulation and asset reconciliation logic.
00:04:41 – Scenario 1: Full lifecycle of Long positions (Open, Reduce, Add, Close).
00:06:29 – The Ultimate Test: Flip (Position Reversal) concurrency and Resource Stealing.
00:09:53 – Scenario 2: Validation of reverse operations in Short position mode.
00:13:30 – Stress Dimensions: Partial fills and coverage of different price levels.
00:16:12 – Code Walkthrough: TradeTest environment initialization and reset mechanisms.
00:18:41 – Risk Control Interception and key considerations for Flip testing.
00:20:00 – Live Verification: Validating expected positions and account balances via APIs.
00:21:44 – Troubleshooting: Handling Kafka latency and Connector connection failures.

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🏷️ Technical Keywords
#IntegrationTesting #ExchangeCore #MatchingEngine #FinTech #AutomatedTesting #DistributedSystems #Kafka #FlipProtocol #AssetReconciliation #BackendDevelopment #SystemDesign #QualityAssurance #TradingSystems

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