Hi, I have updated to the 0.4.0 release of Decompo...

# mvikotlin

[Michael Thiele]

Hi,
I have updated to the 0.4.0 release of Decompose. The ComponentContext now only exposes a BackPressedHandler which can be used to register handlers for the back-button. I have several unit tests that verify the correct behaviour of the back button action which I have initiated with onBackPressed() which is now missing. How can I simulate a back-button pressed in a unit test? Thanks.

[Michael Thiele]

Okay, writing it down helped me find a solution by myself. 🙂
I use a special TestBackPressedHandler in my code that mimicks the DefaultBackPressedDispatcher of Decompose that exposes the `onBackPressed()`method.

private val backPressedHandler = TestBackPressedHandler()
    private val componentContext = DefaultComponentContext(lifecycle, backPressedHandler = backPressedHandler)
    private val componentUnderTest = MyComponent(componentContext, ...)

[Arkadii Ivanov]

I think you should be able to use DefaultBackPressedDispatcher in your test? Just store it in a variable, pass it down to the DefaultComponentContext, and use the variable to call the dispatchet.

[Michael Thiele]

I would like to, but the DefaultBackPressedDispatcher is internal and thus cannot be accessed from my code.

[Arkadii Ivanov]

Yeah, there is builder function BackPressedDispatcher, should have this added to the readme: https://github.com/arkivanov/Essenty/blob/e0cb37a4fef0e0907b67454d40e876ebdee548d7/back-pressed/src/commonMain/kotlin/com/arkivanov/essenty/backpressed/BackPressedDispatcher.kt#L12

[Michael Thiele]

Good to know. Works like a charm. Thanks!