How to use case paths with Swift testing?

[thinkpractice]

Hi all,

I've been following the PointFree courses on swift navigation as of late and I want to implement somethings similar in my app

@Observable
final class AppModel
{
    @CasePathable
    enum Destination
    {
        case mainScreen(viewModel: MainViewModel)
        case onboardingScreen(viewModel: OnboardingFeatureViewModel)
    }
    
    var destination: Destination
    
    init(destination: Destination)
    {
        self.destination = destination
    }
   
    func login() async throws
    {
        
    }

Now depending on whether login can find already saved credentials I would like to change the destination of the AppModel. How can I test this though? I'm using the new swift testing, but cannot find out how to test whether the correct destination has been chosen:

@Test
func loginWithNoAccountsInDatabaseSetsDestinationOnboarding() async throws
{
    let appModel = withDependencies {
        $0.defaultDatabase = try! appDatabase()
        $0.socialMediaClient = MockSocialMediaServer()
    } operation: {
        AppModel(destination: .mainScreen(viewModel: MainViewModel()))
    }
  
    #expect(appModel.destination.is(\AppModel.Destination.mainScreen)) // does not work?
    
    try await appModel.login()

    #expect(appModel.destination.is(\AppModel.Destination.onboardingScreen)) // does not work?
    
        
}

any help would be greatly appreciated!

[mbrandonw]

Hi @thinkpractice, it should be as simple as this:

#expect(appModel.destination.is(\.mainScreen))

Does that work?

[thinkpractice]

@mbrandonw it does! Thanks so much! It's the one thing I didn't try of course ;)