Compose Test not working with `ComposeUIViewController` in iOS about compose-multiplatform

[m-sasha]

Does it work without Koin? Without resources?

[igorescodro]

That's a very good question... No, it also fails with the exact same error. However, in Android it crashes because at some point the Koin Graph is needed to get the injections. Which leads me to think that something else is happening and my iOS' MainViewController is not being rendered.

$ gradle shared:connectedAndroidTest

java.lang.IllegalStateException: KoinApplication has not been started
at org.koin.core.context.GlobalContext.get(GlobalContext.kt:36)
at org.koin.compose.KoinApplicationKt.getKoinContext(KoinApplication.kt:52)
at org.koin.compose.KoinApplicationKt.access$getKoinContext(KoinApplication.kt:1)

The sample code runs fine even with Koin and resources, though:

@BeforeTest
fun setup() {
    initKoin(appModule = module)
}

@AfterTest
fun tearDown() {
    stopKoin()
}

@Test
fun test_titleChangesWhenBottomIconIsSelected() = uiTest {
    val title = resourcesProvider.getString(HomeSection.Tasks.title.desc())
    setContent {
        var text by remember { mutableStateOf(title) }
        Text(
            text = text,
            modifier = Modifier.testTag("text")
        )
        Button(
            onClick = { text = "Compose" },
            modifier = Modifier.testTag("button")
        ) {
            Text("Click me")
        }
    }

    onNodeWithTag("text").assertTextEquals(title)
    onNodeWithTag("button").performClick()
    onNodeWithTag("text").assertTextEquals("Compose")
}

[m-sasha]

Wait, the testing framework only works with Compose UI. It won't work with native elements such as UIViewController.

[igorescodro]

But if I update the coding to directly call the AlkaaMultiplatformApp() directly in iOS, I face the following issue:

kotlin.IllegalStateException: CompositionLocal UIViewController not provided

That's my iOS's MainViewController:

@OptIn(ExperimentalComposeApi::class)
@Suppress("Unused", "FunctionName")
fun MainViewController(): UIViewController = ComposeUIViewController(
    configure = {
        accessibilitySyncOptions = AccessibilitySyncOptions.Always(AccessibilityDebugLoggerImpl())
    },
) {
    AlkaaMultiplatformApp()
}

Is there a way to use it directly and provide this custom CompositionLocal?

[m-sasha]

You need to remove the direct dependency on UIViewController from the code you're trying to test.

[igorescodro]

Got it. The reason was the WindowSizeClass inside my AppState class. Removing caused another problems with UNUserNotificationCenter.currentNotificationCenter() but definitely not related to ComposeUIViewController as I reported. Thank you for the help!