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

先比較 Firebase JavaScript 單元測試文件與所要求的 Python Gen 2 工作流程，然後檢視連結的 Firestore 模擬器並行處理指引。只有當可重現的方法涵蓋並行 POST 請求、Firestore 狀態判斷以及 Firebase Local Emulator 的使用時，該 issue 才算完成。

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