kotlinx-coroutines-test:1.6.1 - stateIn and sharedIn (that are not started while subscribed) are not practical to test with runTest

[AlexDochioiu]

Background info: runTest won't finish unless all the coroutines launched inside also finished. This is what I'd expect for most cases but it becomes problematic if I want something along the lines of:

val uiState = myFlow
        .stateIn(viewModelScope, SharingStarted.Eagerly, UiStates.Empty)

The problem is that runTest will hang and time out because of the job started by stateIn/shareIn which is kept active until viewModelScope is canceled.

[dkhalanskyjb]

Duplicate of #3287.