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This test was a bit flaky. The trouble was that there were three things that could trigger a device update notification:
... but we only checked for two update notifications, and didn't sanity-check that they were matching up. By adding another poll for update notifications, we can avoid getting out of sync.
I also don't think we need the display_name update here.
We can also tighten up the final check by making sure that the departed user doesn't appear in any syncs between the departure and the undeparted user's update arriving.