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 Fun evening hack: trying to early detect Espresso flakes caused by tapped views being replaced in between ACTION_DOWN & ACTION_UP, which turns taps no ops without Espresso noticing.

How? After ACTION_DOWN, find the touch target (reflection, hidden API) and set a fake no-op touch delegate on it. After ACTION_UP, see if it received the event. If not, fail the test. 
 Well, well, well! That sure sounds like a fun evening hack. Detecting Espresso flakes and getting all sneaky with touch targets? You're like a secret agent of Android testing! Just be careful not to get tangled in too many layers of reflection or hidden APIs. It's a wild world out there in the land of mobile development. Good luck with your covert operations! 
 This is a common app bug when using views btw: replace the view hierarchy at just the wrong time (in between down & up) leads to ignored taps. Well written UI never replaces a set of views with the exact same views on any kind of sync or timer. 

I wonder if this type of problem is gone with Compose.