How to properly `mockk / verify` a lambda? Looks like ``` val observer = mockk<(Int) -> Unit&g...

# mockk

[Davide Giuseppe Farella]

How to properly mockk / verify a lambda?
Looks like

val observer = mockk<(Int) -> Unit>() 
observer( 1) 
verify { observer( 1 ) }

Is not working.
Tbh I didn't test exactly that code, I was trying within an Android LiveData, but replacing the mockk with a real lambda i can see right output printed in the console. Same with spy

[oleksiyp]

Hi

[oleksiyp]

Lambda should be straightforward as in Kotlin lambda always implements interface

[oleksiyp]

Can you please tell what error you face

[Davide Giuseppe Farella]

This is my code:

val liveData = MutableLiveData<Int>()
​
val observer = mockk<(Int) -> Unit>()
val lifecycleOwner = mockk<LifecycleOwner>( relaxed = true )
val lifecycle = LifecycleRegistry( lifecycleOwner )
​
lifecycle.handleLifecycleEvent( Lifecycle.Event.ON_RESUME )
liveData.observe( lifecycleOwner, observer )
liveData.value = 1
verify( exactly = 1 ) { observer( 1 ) }

[Davide Giuseppe Farella]

verify says observer( 1 ) has not been called, but replacing the mock with { println( it ) } I can see 1 printed in the console

[Davide Giuseppe Farella]

I didn't try the snipped mentioned in the first post directly because I had to leave my pc, but I can't see why the result should be different 🙄 ( maybe I'm wrong )