Hi, is there a change from version 1.12.3 onwards regarding the

mockStatic

? The same tests without any code change work with 1.12.3 but not with latest versions.

It seems like

registerInstanceFactory

is no longer working for

value

classes. I have a value class that contains some validation in the

init{}

block that’s failing when using the new

any()

support for value classes.

Hey guys, Can anyone guide me what is the difference between

spyk

and

mockk

?

HistoryView

is an AndroidView so I can't mock it. How do I test this code inside the lambda?

@VisibleForTesting
    fun attachHistory() {
        historyView = HistoryView(get(),
            navToPastVisits = ::attachVisitHistory,
            handlePastVisitsBackPressed = {
                visitHistoryRouter?.let { <------ I want to test the logic here
                    if(!it.handleBackPress()) {
                        detachVisitHistory()
                    }
                    true
                } ?: false
            }
        )
    }

hello, is there any plan on releasing a new version soon? I see some fixes since 1.13.2

i may be publishing a new release later this week or early next week if my day job leaves me enough time 😅

Hello! https://stackoverflow.com/questions/74400503/how-do-i-mock-a-kotlin-function-type-with-mockk

Hello folks. Is anybody here using Mockk with the Eclipse Open J9 JVM?

Hi, supposing I have a

mockInstance

that has a member function

fun foo(arg: MyClass): Int

, and I want to mock the function

foo

only if it takes an arg that is constructed with specific values:

every { mockInstance.foo(MyClass(1, "a", 0)) } returns 42
every { mockInstance.foo(MyClass(1, "a", 1)) } returns 42
every { mockInstance.foo(MyClass(1, "a", 2)) } returns 42
every { mockInstance.foo(MyClass(1, "a", 3)) } returns 42
every { mockInstance.foo(MyClass(1, "a", 4)) } returns 42
...

In fact, I would like to say

every { mockInstance.foo(MyClass(1, "a", any())) } returns 42

but I can't because the argument passed to

foo

is a real instance of

MyClass

and so I can't pass

any()

to it. Is there a particular matcher I can use?

Hi, I am testing my function. Inside on function paramter I am passing the

lamda

with

Arrangement.Vertical

. I tried some piece of code but it giving me error. Can someone help me on this.

fun isBluetoothEnable(
    bluetoothOn: () -> Arrangement.Vertical,
    bluetoothOff: () -> Arrangement.Vertical
): Arrangement.Vertical {
    return if (isBluetoothEnabled) {
        bluetoothOn()
    } else {
        bluetoothOff()
    }
}

Hey guys, I have a question! Given this

sealed interface A {
  
  data class B(...): A
  data class C(...): A
}

fun something(a: A): Int

every { something(any()) } returns 0
every { something(any<B>() } returns 1

I would expect that

something(B(...))

would return 1 ✅ correct And that

something(C(...))

would return 0 ❌ wrong This is because the

Type

in

any<Type>()

actually doesn’t “work”. The correct way to do this is the more verbose one

every { something(any()) } answer {
  when (firstArg<A>()) {
    is B -> 1
    else -> 0 // or error() or whatever
  }
}

Is this expected or is it a bug? Mock 1.13.2 on JVM 11

v1.13.3 is out! lots of updates, and, above all, lots of new contributors! Thanks a lot to everyone involved! https://github.com/mockk/mockk/releases/tag/1.13.3

Hi I want to mock my method

fun wait(){
    val timeout= TimeHelper.getNow() + timeoutInterval // <- part of class constructor
    if(processor.getLag() > 0){
        val currentTIme = TimeHelper.getNow() 

        if(currentTime >= timeout){ System.exit(42) }
        Thread.sleep(someTime)
    }
}

Is there a way for me to use mockk to either that

wait()

has executed for x amount of time with

verify(exactly = x) { someProcessor.wait() }

, or

Thread.sleep()

has been sleeping for x number of time? I have something like this in my test class

every { processor.getLag() } returns 1
every { TimeHelper.getNow() } returns 100

So after some number of executions

ever{ processor.getLag() } returns 0

to validate that it finishes

Hi, quick question: Is mockk supposed to work alongside context receivers? If yes I will write a more detailed issue.

it’s a little bit awkward that there’s

every {}

and

coEvery {}

. It makes sense, because Kotlin can’t allow suspend funs to be overloaded, so the names have to be different. But it’s still awkward. If I refactor my code to be suspending, I have to rename lots of mocking functions. And if I don’t use coroutines, the

coEvery

,

coVerify

,

coAssert

auto completes aren’t useful, and clutter my auto-complete. But… what if MockK provided a wrapper function for tests?

@Test
   fun myTest() = coMock {
     // non suspending function - will use 'every {}'
     every { nonSuspendingFunction() } returns 123

     // a suspending function - can also use 'every {}'
     every { suspendingFunction() } returns 999
   }

suspend fun coMock(context: CoMockKContext.() -> Unit)

would provide a coroutine context, and the receiver,

CoMockKContext

, would provide

suspend fun

versions of the standard MockK DSL. Pros: • no more need for all the MockK functions to be duplicated according to suspend/regular functions. • as a MockK user, if I refactor my code to be suspend/non-suspend then I don’t need to rename the mocking functions • if I have a non-suspending codebase my auto-complete isn’t cluttered with suspend MockK DSL variants - coroutines become ‘opt-in’

How to mock a method with context receiver? Here's my setup:

interface AProvider {
    context(ContextProvider)
    fun getA(a: String) = a
}

class ContextProvider

inline fun <reified T : Any> mockkWithContext(noinline block: context(ContextProvider) T.() -> Unit) =
    withContext { mockk<T> { block(this@withContext, this@mockk) } }

fun <T> withContext(block: ContextProvider.() -> T) = ContextProvider().block()

class ContextReceiversTest {
    @Test
    fun `a test`() {
        val aProviderMock: AProvider = mockkWithContext {
            every { getA(any()) } answers { firstArg() }
        }
        println(withContext { aProviderMock.getA("a") })
    }
}

As you can see the getA method has

ContextProvider

as a receiver. In order to mock it in the test I have to wrap standard

mockk

in

withContext

which provides the required receiver for

getA

. If I run the test, though, it fails on

io.mockk.MockKException: no answer found for: AProvider(#1).getA(com.example.playground.ContextProvider@38b5f25, a)

Apparently mockk expects the receiver as the first argument but obviously I cannot write

every { getA(any(), any()) }

. So my question is how can I mock the method in my case?

Sharing this with you all folks 🙂 https://kotlinlang.slack.com/archives/C0BJ0GTE2/p1671804380222309

Thanks!

If anyone has experience with turbine and mutable state flow. Why would this work:

val mutableSharedFlow = MutableSharedFlow<Int>()
mutableSharedFlow.test {
    mutableSharedFlow.emit(1)
    assertEquals(awaitItem(), 1)
}

and this does not work:

runTest(UnconfinedTestDispatcher()) {
    val bleAdapterEnabledFlow = MutableStateFlow(false)
    val stateFlow = bleAdapterEnabledFlow.stateIn(this)
    stateFlow.test {
        bleAdapterEnabledFlow.emit(true)
        assertEquals(awaitItem(), true)
    }
}

I don't see

coAssert

in the codebase at all. I also don't see it in autocomplete, but I do see

coEvery

and

coVerify

. I'm on

1.13.3

Did it not make it in?

Hi, I have been stuck with a problem since past few days, it's regarding coverify incase of a generic class. Have anyone faced this problem https://stackoverflow.com/questions/75089378/why-is-mockk-failing-and-calling-real-method-when-doing-coverifyexactly-0 Please help .

Hi team. please: is it possible to disable Kafka during my unit tests? I’ve created a class with a method using

@KafkaListener

annotation and when I run the functional tests, I produce a protobuf topic message and the listener works properly to consume that message. But my unit test need to test this method, and I am using this:

@Autowired
lateinit var ingestionListener: IngestionConsumerListener

to inject my listener and I want to test this method but without the Kafka in memory. But the test is trying to load the Kafka because I am getting this:

Could not resolve placeholder 'ingestion.config.topic.name' in value "#{'${ingestion.config.topic.name}'}"

that is used in my implementation:

@KafkaListener(
    id = "ingestionListener",
    topics = ["#{'\${ingestion.config.topic.name}'}"],
    groupId = "#{'\${ingestion.consumer.group.id}'}",
    concurrency = "#{'\${ingestion.config.consumer.concurrency}'}"
)
fun consumeIngestion(ingestionHttpRequest: ConsumerRecord<String, IngestionHttpRequest.HttpRequest>)

I am trying to use this kind of solution for my first unit test using Kotlin and Kafka:

@EnableAutoConfiguration(exclude = [KafkaAutoConfiguration::class])

but I am still struggling with the error above… Please any suggestion to fix that? How to test a kafka listener using Java/Kotlin without Kafka in memory?

hello everyone, in my current project we have several instrumentation tests in different packages, when we run the tests in a single package everything works as expected, but if we run several tests in several packages by running from the parent package we get weird

UninitializedPropertyAccessException

, according the the stacktrace the problem traces back to this

java.lang.AbstractMethodError: abstract method "boolean kotlin.reflect.KClass.isValue()"

which seems to be related to mockK, has anybody come across this issue before?

V1.13.4 is out, thanks a lot to @Adam S as always and to a lot of new contributors! Several bugfixes included in the release, check it out! https://github.com/mockk/mockk/releases/tag/v1.13.4

How to mock a method with lambda argument, e.g.

AsyncTaskExecutor#submit

? Currently I'm doing this

val taskExecutor: AsyncTaskExecutor =
        mockk {
            every { submit(captureLambda()) } answers {
                CompletableFuture.completedFuture(lambda<() -> Int>().invoke())
            }
        }

but getting

Caused by: java.lang.ClassCastException: class java.lang.Object cannot be cast to class kotlin.Function (java.lang.Object is in module java.base of loader 'bootstrap'; kotlin.Function is in unnamed module of loader 'app')

I should probably use

hint

but not sure how exactly.

Hi folks. A question about best practice for verifying call arguments in mockk (we’re using strikt here, but the question is general). Imagine such setup:

interface Dependency {
        fun bar(i: Int): Int
    }

    class Service(val injected: Dependency) {
        fun foo(i: Int) = injected.bar(i * 2) / 3
    }

    private val mock = mockk<Dependency> { every { bar(any()) } returns 42 }
    private val service = Service(mock)

Would you rather do `capture`:

@Test
    fun testUsingCapture() {
        val arg = slot<Int>()
        val result = service.foo(100)
        verify { mock.bar(capture(arg)) }
        expect {
            that(arg).captured isEqualTo 200
            that(result) isEqualTo 14
        }
    }

or `withArg`:

@Test
    fun testUsingWithArg() {
        val result = service.foo(100)
        verify {
            mock.bar(
                withArg {
                    expectThat(it) isEqualTo 200
                }
            )
        }
        expectThat(result) isEqualTo 14
    }

?

I am having issues in verify block Verify block misses the functions declared inside a function

fun fetch() = callbackFlow {
    fun tryEmitData(data) {
       // implementation
    }

    dataProvider.initialize { data, error -> 
       tryEmitData(data)
    }

}

I can see through debugger,

tryEmitData

is hit by debugger properly but verify misses the

tryEmiData

internal function block

Hi guys, I am new in Flow with unit testing. I want to test this function

internal suspend fun subscribeAndGetConnectionStateChange(connectGatt: () -> Unit): ConnectionStateChanged {
    val triggerEvents = watchGattCallback.triggerBluetoothGattCallbackEvents
    return triggerEvents.onSubscription {
        connectGatt()
        gattConnection = true
    }.firstOrNull {
        isGattSuccessAndStateConnected(it)
    } as ConnectionStateChanged? ?: getGattFailureAndStateDisconnected()
}

this

triggerBluetoothGattCallbackEvents

is a type of

MutableSharedFlow<GattTriggerEvent>(extraBufferCapacity = 50)

But I am getting error.

Hi, is there a way to check which every {} is used when a mock function is called? I’m using IntelliJ and my mocks are behaving strangely, I’m looking for a way to debug