Smartphone notifications when you don't have a good network connection are hugely frustrating. Apps should be required to cache anything they choose to display a notification about before they show it. Unfortunately, I think most testing assumes perfect network connectivity.
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I'm just working on this now in Wire Android's app. Notifications are a huge pain in the bum even in the best network conditions. So many edge cases... But yes, we cache them.
Good work! So many apps don't, and if my network is down, not only do I miss the thing I wanted to see, but I lose my only link to it when the notification goes away... though I suppose that's a different API misusage.