Hi guys, I have `MutableSharedFlow` like this ```private val triggerValue = MutableSharedFlow<Blo...

# flow

[KotlinLeaner]

Hi guys, I have MutableSharedFlow like this

private val triggerValue = MutableSharedFlow<BloodPressureMeasurement>()
val triggerBpValue: SharedFlow<BloodPressureMeasurement> = triggerValue

I am using in different viewmodel

internal fun handleBpValue() {
        viewModelScope.launch(context = <http://Dispatcher.IO|Dispatcher.IO>) {
            someClass.triggerBpValue.collectLatest { measurement ->
               // code in here
            }
        }
    }

I am trying to unit test in mockk

[KotlinLeaner]

@Test
fun `handleBpValue - `() = runTest {
    coEvery {
        someClass.triggerBpValue
    } returns MutableSharedFlow {
        emit(mockBloodPressureMeasurement)
    }


    subject.handleBpValue()

  
    verify {

    }
}

I am getting error in here

[Giorgi]

You are directly invoking MutableSharedFlow. It has this signature:

public fun <T> MutableSharedFlow(
    replay: Int = 0,
    extraBufferCapacity: Int = 0,
    onBufferOverflow: BufferOverflow = BufferOverflow.SUSPEND
): MutableSharedFlow<T> {

when you use curly braces you are passing a last argument, which requires type of onBufferOverflow: BufferOverflow , so it complains about that type.

so try something like

val triggerValue = MutableSharedFlow<String>()
    
    @Test
    fun `some test name here`() = runTest {
        every { // I think it does not need coEvery, but not sure
            triggerValue as Flow<String>
        } returns flowOf("123")
    }

[KotlinLeaner]

Ohh nice thanks

[KotlinLeaner]

Do you have any flow test examples ?

[Giorgi]

nope, it is not an example, but I would recommend this video

https://www.youtube.com/watch?v=hzTU0lh-TIw▾

[KotlinLeaner]

Thank you so much

[KotlinLeaner]

I'll take a look

[Giorgi]

🚀