How to create multiple applications in single test run

[IngvarX]

Hello!

Is there a way to create multiple instances of application in single test run? I know that desktop lifetime requires single instance of app so let's say I will execute tests one by one, But this code fails if execute it twice:

AppBuilder
                .Configure<App>()
                .UsePlatformDetect()
                .UseReactiveUI();
    }

Any ideas how to solve this?

[maxkatz6]

I don't think it possible to have multiple app instances in one process, since avalonia uses static services locator and dispatcher.

Also it might not be possible on some platforms to run multiple UI threads at all (see: macos), but this specific problem can be solved with Headless platform, starting tests without any UI and rendering, but with all visual elements and ability to raise input events.

[IngvarX]

https://github.com/IngvarX/Camelot/blob/F7-test/tests/Camelot.Ui.Tests/AvaloniaApp.cs

[maxkatz6]

Have you tried to use approach from repository I used as an example? With integration with xUnit.
Or does it has limitations for you?

[IngvarX]

Not yet. Anyway it looks like it's used for unit testing while I'm trying to do integration testing with fully functional app

[IngvarX]

Checked code, but seems that it doesn't create lifetime that I need to get main window

[IngvarX]

Ok, after some struggling I was able to separate tests. Thanks!

[Gillibald]

https://github.com/AvaloniaUI/Avalonia/blob/master/tests/Avalonia.UnitTests/UnitTestApplication.cs
All unit tests use that technique

[IngvarX]

what about headless platform multiple UI tests with each own app initialization?