Hi! :wave: Testing + AnimatedNavController I want ...

# compose

[dambakk]

Hi! 👋 Testing + AnimatedNavController
I want to test a composable that has its own navigation. I pass in an instance of TestNavHostController as NavHostController parameter (defaults to rememberAnimatedNavController) but get an exception when the building the navgraph:

androidx.navigation.testing.TestNavigatorProvider$navigator$1 cannot be cast to com.google.accompanist.navigation.animation.AnimatedComposeNavigator
  at com.google.accompanist.navigation.animation.NavGraphBuilderKt.composable(NavGraphBuilder.kt:124)

Doesnt the accompanist nav animation lib support testing yet?
(code in 🧵)

[dambakk]

Composable to be tested:

@OptIn(ExperimentalAnimationApi::class)
@Composable
fun FeedbackRoot(
    navController: NavHostController = rememberAnimatedNavController(),
    viewModel: FeedbackViewModel = viewModel()
) {
...
AnimatedNavHost(
        navController = navController,
        startDestination = "feedbackTypePicker",
    ) {
        composable(
            route = "feedbackTypePicker",

The exception is thrown from the first call to composable in the lambda of the AnimatedNavHost.
The test:

@get:Rule
val composeTestRule = createComposeRule()

@Test
fun feedbackScreen_clickingTypeNavigatesToCategoryScreen() {
    val navController = TestNavHostController(ApplicationProvider.getApplicationContext())
    composeTestRule.setContent {
        NTTheme {
            FeedbackRoot(
                navController = navController,
                viewModel = feedbackViewModel,
                onFinish = {}
            )
        }
    }
   ...
}

[dambakk]

Turns out using

@get:Rule
val composeTestRule = createComposeRule()

instead of

val composeTestRule = createAndroidComposeRule<FeedbackActivity>()

fixed my issues. I thought I had to inject a TestNavHostController instance instead of using the default AnimatedNavHostController, but apparently not, the test runs just fine with it 🙂