How do you write tests in a Compose-Desktop app ? Is it possible to simulate button clicks ?

See https://github.com/JetBrains/compose-jb/issues/368#issuecomment-810033136

Yes, or if you want something testing even more of the stack, you could use AWT Robot to simulate button clicks. However, honestly, your button click logic should be so simple as to be almost foolproof, so any time you have available to write tests would probably be better spent writing a different kind of test. Specifically, the more important thing to test is that after your state is such that the button has been clicked, that the result rendered by the widget is correct. You can do this by creating a state object that represents the post-click state, and rendering it to a canvas and checking the output against a reference image. As an added bonus, you are also verifying that the state of your widget is properly hoistable.

Love that framing @jim Looking forward to someone creating a nice screenshot testing framework for compose UI.

Note that on latest versions of macOS you'll need to grant Java runtime extra system-level permissions to use the

java.awt.Robot

APIs (maybe just the ones that move the mouse, or maybe in general)