Hi guys :female-technologist: looking for some tes...

# compose

[Alexa_Gal]

Hi guys 👩‍💻 looking for some testing advices

i want to create my first androidTest and im having some problems trying to mock the ViewController of my view, maybe im doing something working but i would like to test only the view without the view controller (i already have the Unit test for my view controller)

how would you do it using hilt and compose-navigation (HiltAndroidTest)

[Peter Mandeljc]

I usually make another composable, that doesn't require controller as a parameter. For example

fun LoginScreen(vm: LoginViewModel = hiltViewModel(), onPopBack: () -> Unit) {
    val state by vm.anyState.collectAsState()
    LoginView(state, onPopBack)
}

// Test this
fun LoginView(anyStateFromVM: ?, onPopBack: () -> Unit) {
    // ...
}

[Alexa_Gal]

would you also pass the functions and state needed on the view e.g doLogin: vm.doLogin... ?

[Peter Mandeljc]

Yeah, pass all the state, that is provided by VM and expose all callbacks that call VM functions

LoginView(state, onPopBack, onLogin: vm::onLogin)

[Alexa_Gal]

nice, ill try to implement something similar thanks peter 🙂

[Peter Mandeljc]

But you still miss a bit of test coverage, if you test it without VM. In my example LoginScreen isn't tested

[Alexa_Gal]

i have a unit test for the VM that one covers the logic there

[Alexa_Gal]

🤔

[Peter Mandeljc]

tough you can always make an instance of LoginViewModel, by simply call constructor LoginViewModel(), you don't need to call hiltViewModel<LoginViewModel>()

[Alexa_Gal]

that could be a bit more complex since i have @inject props coming from hilt i would need to create one VM with mock props 🤔 dont you think?

[Peter Mandeljc]

yeah, exactly