Hi I have updated to the 0 4 0 release of Decompose The `Com kotlinlang #mvikotlin

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Title

m

Michael Thiele

10/27/2021, 6:37 AM

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.

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, ...)

a

Arkadii Ivanov

10/27/2021, 9:54 AM

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.

m

Michael Thiele

10/27/2021, 11:03 AM

I would like to, but the

DefaultBackPressedDispatcher

is

internal

and thus cannot be accessed from my code.

a

Arkadii Ivanov

10/27/2021, 11:09 AM

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

👍 1

m

Michael Thiele

10/27/2021, 11:13 AM

Good to know. Works like a charm. Thanks!

🎉 1

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