Using the new Compose typesafe navigation, what’s ...

# compose-android

[Yves Kalume]

Using the new Compose typesafe navigation, what’s the best way to run a test that depends on the Route object in SavedStateHandle?
For example, I have the following code:

private val route = savedStateHandle.toRoute<MyRoute>()

How can I instantiate the SavedStateHandle object in my tests? Specifically, what should I provide as a key for the map? I’ve tried code similar to the following, but none of the Route properties are being passed :

val savedStateHandle = SavedStateHandle(mapOf(MyRoute::class.qualifiedName to fakeRoute))

[Ian Lake]

The navigation-testing library has a SavedStateHandle(MyRoute()) factory method: https://developer.android.com/reference/kotlin/androidx/navigation/testing/package-summary?hl=en#(androidx.lifecycle.Save[…],kotlin.collections.Map)

[Ian Lake]

See the example tests: https://cs.android.com/androidx/platform/frameworks/support/+/androidx-main:navigati[…]va/androidx/navigation/testing/TestSavedStateHandleFactory.kt

[Marko Novaković]

is there a way to run this inside regular, junit, unit tests?

[Marko Novaković]

I’m getting android.os.Bundle methods not mocked error.
I have testOptions.unitTests.isReturnDefaultValues = true in gradle

[Ian Lake]

As seen in the exact documentation of that method, you need to use Robolectric

[Jonas]

Not sure if it is the best idea (as it depends on internals) but we currently mocked the SavedStateHandle using mockk to use it in plain unit tests. Here an example:

SavedStateHandleMock.kt

[Ian Lake]

Now that https://issuetracker.google.com/issues/398265336 is solved, the next alpha of Navigation will let you use jvmTest (no Robolectric) with SavedStateHandle

[Jonas]

Thx for the heads up. We will try that with the next version.

[Marko Novaković]

thanks, that is awesome. I used to use similar mockk setup

[Petros Chariskos]

I am having the same issue in a compose multiplatform project and I cannot seem to be able to solve.

@Ian Lake I am trying to write unit tests (not instrumentation) for viewmodels that make use of safe navigation arguments via the SavedStateHandle.toRoute api. My tests are in commonTest target. My app is targeting android and ios (iosX64, iosArm64 and iosSimulatorArm64).

androidx.navigation:navigation-testing does not seem to be compatible with ios. I have tried to use the androidUnitTest with Robolectric but I get java.lang.NullPointerException: encode(...) must not be null
I have not tried to create a new jvm target and write tests there because I am not needing it and creating it would mean a number of actual implementations that would not serve any purpose.

I could not find any source online with a concrete example, any help or guidance is more than welcome.