An idea to check if the code using system APIs works is to simply wrap the system API to be able to replace it with a testing implementation of pour own and under our control (a simulator) to exercise the code that is using this API. But having an automated test that really checks if the system API works is way harder and will likely need to be done manually (I would be fine with manual testing). We could also write a smoke test entry for our QA, if reasonable (I'll ask around how exactly).
Bug 1562386 Comment 9 Edit History
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An idea to check if the code using system APIs works is to simply wrap the system API to be able to replace it with a testing implementation of our own and under our control (a simulator) to exercise the code that is using this API. But having an automated test that really checks if the system API works is way harder and will likely need to be done manually (I would be fine with manual testing). We could also write a smoke test entry for our QA, if reasonable (I'll ask around how exactly).