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# flow
f

Florian Walther (live streaming)

01/01/2022, 10:50 AM
Did anyone try using 
getOrAwayValue()
(the helper function from Google's testing samples) on 
Flow#asLiveData()
? I'm not getting a value.
It works if I use 
UnconfinedTestDispatcher
instead of 
StandardTestDispatcher
g

gildor

01/04/2022, 2:37 PM
Created flow probably asynchronous, so you just get empty live data, this why unconfined dispatcher helps Why do you convert it to live data?
f

Florian Walther (live streaming)

01/04/2022, 2:42 PM
I use LiveData for the automatic handling of the activity lifecycle
g

gildor

01/04/2022, 2:52 PM
Why you cannot do the same with flow?
I just really think that there is no valid reasons anymore to use livedata if you already has flow in the project
f

Florian Walther (live streaming)

01/05/2022, 11:03 AM
Yea I'm considering switching to Flow but I still didn't just want to ignore the problem. But we found the solution eventually.
g

gildor

01/05/2022, 2:15 PM
I wouldn't call it a problem, rather lack of proper testing facilities for live data. Testing reactive properties with non reactive tests is always painful and unreliable, because they become testable only when some kind Unconfined dispatchers/schedulers are used for all involved components
f

Florian Walther (live streaming)

01/05/2022, 2:51 PM
Google has a LiveData TestUtil for that which seems to work
The 
getOrAwaitValue
one
But it seems to need 
UnconfinedTestDispatcher
to work
g

gildor

01/06/2022, 3:09 AM
Yes, of course
My point is that getOrAwaitValue is not the best way to test any reactive properties, in any framework
f

Florian Walther (live streaming)

01/07/2022, 10:34 AM
Thank you. I will probably replace LiveData for Flow in the UI layer earlier or later. I just wish I would understand why 
asLiveData
needs 
UnconfinedTestDispatcher
to work.
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