MainViewModelTest .whenMainClicked_updateTaps has UncompletedCoroutinesError

[dgoldhirsch]

The recommended first test case won't work any more:

@test
fun whenMainClicked_updatesTaps() {
subject.onMainViewClicked()
Truth.assertThat(subject.taps.getValueForTest()).isEqualTo("0 taps")
coroutineScope.advanceTimeBy(1000)
Truth.assertThat(subject.taps.getValueForTest()).isEqualTo("1 taps")
}

Running it as recommended, without any testing context will produce this:

Same bug exists in the finished_code module of the codelab project.

I fixed it by upgrading in coroutines-codelab build.gradle the coroutines_android_version to '1.6.3' and using the new runTest scope:

Also perhaps note that advanceTimeBy is deprecated since 1.6. Per the deprecation message, the recommended replacement is to advance the scheduler and runCurrent, manually, e.g.: