testing support for concurrent HTTP calls and Firestore side effects in Firebase Cloud Functions (Python, Gen 2)

What I’m looking for

* A Python testing approach or library that can help for generation 2 functions & firebase.
* Mock/simulate multiple concurrent POST requests.
* Assert Firestore database state after execution.
* Something that works well the firebase local emulator.

What I have tried so far

1. I have found testing documentation for js : https://firebase.google.com/docs/functions/unit-testing
2. Tried testing on firebase emulator with little success since concurrency behaviour greatly differs from production:https://cloud.google.com/firestore/native/docs/emulator#transactions
3. Unit test samples only involve js : https://github.com/firebase/functions-samples/tree/main?tab=readme-ov-file

首先将 Firebase JavaScript 单元测试文档与所要求的 Python Gen 2 工作流进行比较，然后查看链接的 Firestore 模拟器并发指导。只有当一种可复现的方法涵盖并发 POST 请求、Firestore 状态断言以及 Firebase Local Emulator 的使用时，该 issue 才算完成。

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