Hello hello folks. I;m following this toturial to ...

# compose-desktop

[Leandro Borges Ferreira]

Hello hello folks. I;m following this toturial to create Ui tests for my app... but I always receive this error:

No ViewModelStoreOwner was provided via LocalViewModelStoreOwner

When viewModels are instantiated by the app inside the test. The app works just fine, but the UI tests never run. I'm using runComposeUiTest. Is this a known issue?

[zsmb]

Known issue as in there always needs to be an owner present through the LocalViewModelStoreOwner composition local that any ViewModels can be scoped to.

If you're using the nav library, its destinations each provide owners automatically. There's also "global" ones on each platform for the entry points of Compose content, here's the desktop one for example (on Android it's the Activity by default, etc).

If you're sure you want ViewModels to be instantiated like this in a test (as opposed to testing smaller parts, or without VMs), you can create your own VMStoreOwner implementation for tests and provide it with a CompositionLocalProvider within setContent, it shouldn't be too much code.

[Leandro Borges Ferreira]

Uhm, so if I get this right I have to instantiate the ViewModels inside the navigation, then it will be provided right? I'm creating some of them outside of the navigation... I'll check if I can create all of them inside the navigation

[Leandro Borges Ferreira]

Thanks for the help Márton 🙂

[zsmb]

I think that should work, yes, even in tests, though I haven't tried it. Maybe try a small nav graph as an example first, there might be other things missing from the test environment that make this nontrivial.

[Leandro Borges Ferreira]

Okay. I'll try in a while and let you know.

[Leandro Borges Ferreira]

Uhm. I did remove all ViewModel initialization outside the navigation. But now I have this error:

java.lang.IllegalStateException: CompositionLocal LocalLifecycleOwner not present
	at androidx.lifecycle.compose.LocalLifecycleOwnerKt$LocalLifecycleOwner$1.invoke(LocalLifecycleOwner.nonAndroid.kt:28)
	at androidx.lifecycle.compose.LocalLifecycleOwnerKt$LocalLifecycleOwner$1.invoke(LocalLifecycleOwner.nonAndroid.kt:27)
	at kotlin.SynchronizedLazyImpl.getValue(LazyJVM.kt:83)
	at androidx.compose.runtime.LazyValueHolder.getCurrent(ValueHolders.kt:46)
	at androidx.compose.runtime.LazyValueHolder.readValue(ValueHolders.kt:48)
	at androidx.compose.runtime.CompositionLocalMapKt.read(CompositionLocalMap.kt:88)
	at androidx.compose.runtime.ComposerImpl.consume(Composer.kt:2390)
	at androidx.navigation.compose.NavHostKt.NavHost(NavHost.kt:831)
	at androidx.navigation.compose.NavHostKt.NavHost(NavHost.kt:231)