using mocking, how would I mock the return of

this.walk()

?

When one should use interfaces over mocking framework?

Hello! How mock functional argument?

val myFunction = mock<(String) -> Unit>()
// actions
verify(myFunction).invoke(captor.capture())

throws: java.lang.IllegalStateException: captor.capture() must not be null

Problem solved. We are using

kluent

and

mockito kotlin

and apparently mockito kotlin buid hasn’t been updated for a while so it was exposing apis that shouldn’t be exposed: https://github.com/nhaarman/mockito-kotlin/blob/2.x/mockito-kotlin/build.gradle#L35

Hi everyone, Is there any way to modify value of

val

in test case other than reflection. I don't want this variable gets modified in main package. Appreciate you help.

Hi guys, I am currently using

mockito-kotlin

in my project, and I saw from the docs that I can assign a property to a mock without actually having to use stubs. But this does not seem to be working in my code.

@Test
fun testCase() {
    val entity = mock<Entity>()
    entity.property = Property()
    assert(entity.property != null) // fails
}

Or does it only work with primitive types or interfaces?

i’m having trouble with verification of suspending functions with mockito failing randomly. the tests most often pass, but will occasionally fail and i’m not sure why. for example:

@Test
    fun `Submits app selection if selections can be made`() {
        mainActivityViewModel.submitAppSelection(selectedApp)

        runBlocking {
            verify(mockAppsStartupFsm).submitEvent(AppSelected(selectedApp))
        }
    }

class MainActivityViewModel {
    fun submitAppSelection(app: App) {
        if (!selectionsCanBeMade()) return
        lastSelectedApp = app

        val coroutineScope = CoroutineScope(Dispatchers.Default)
        coroutineScope.launch { appsStartupFsm.submitEvent(AppSelected(app)) }
    }
}

AppsStartupFsm#submitEvent

is a suspending function. Changing the runBlocking scope to be function level doesn’t seem to help. Is there something I’m missing with verification of suspending functions?

I'm beginning to use tests in my Kotlin projects, is there any recommended framework (really basic needs for now)

Hey guys, do you mark tests in the modules as internal classes?

val commonTest by getting {
            dependencies {
                implementation(kotlin("test-common"))
                implementation(kotlin("test-annotations-common"))
                implementation("org.jetbrains.kotlinx:kotlinx-serialization-runtime-common:0.9.1")
            }
        }

I'm getting

Unresolved reference: Test

when I try and

gradle check

this multiplatform project. IntelliJ is able to find

test-annotations-common

at least enough to auto-import and stuff but something about the tests loses it?

What do you mean? data generator?

I've released Minutest v1.0 today. Please check it out and let me know what you think. https://github.com/dmcg/minutest

Hi guys! I'm currently working on a REST application and try to do that with spring boot, webflux and the functional way with kotlin. With Annotations one could write unit tests by mocking the repository and call the methods of the controller. As the controller returns a Mono of the desired object, it was easily compared and asserted. In the functional way, my handler returns a Mono<ServerResponse>. When I debug it, the desired object is in that ServerResponse, but how to I get it's body? The interface doesn't offer a method for that?! I'm already using the WebTestClient for integration tests, but would now like to write some unit tests for the handler, just like I did for the controller earlier. Any help is appreciated! 🙂

Thoughts on this? https://twitter.com/pablisc0/status/1105136620032921601?s=19 I thought @jw would like it specially since it doesn’t use Mockito but real lambdas 😁

Is there a way to create automatic answers (with default returns) for a mocked object using mockk?

Just thinking: how feasible would it be to implement the syntax and major features of Spock in Kotlin? http://spockframework.org/spock/docs/1.3/all_in_one.html

I'm trying to ignore a test, but it's still being run. Any help on how can I do it?

Does any have experience using

Mockk

I am trying to mock the following function

fun <T> openAndCloseSession(handler: (Session) -> T): T {
    val session = HibernateUtil.sessionFactory.openSession()
    val res = handler(session)
    if (session.isOpen) {
        session.close()
    } else {
        println("[WARNING]: session closed by handler function: ${handler::class.java.enclosingMethod}, please consider omitting manually closing the session in the handler as it will be closed automatically at the end of the call")
    }
    return res
}

I want the mock to just call the provided

handler

(which I have mocked too). This is where I am currently at

val session: Session = mockk()
every { openAndCloseSession<Any>(any()) } answers {firstArg<(Session) -> Any>().invoke(session)}

Sadly this doesn't work.

using junit5/assertJ is there a way for the compiler to figure out that something cannot be null? i.e.

assertNotNull

or

assertThat(nullable).isNotNull

won’t do the trick

Ensure

savePeriodicDump

is non-final:

any()

returns

null

. If the

savePeriodicDump

method is final its code will be executed, meaning a

null

check will be performed on the parameter

https://kotlin.github.io/kotlinx.coroutines/kotlinx-coroutines-test/#using-pausedispatcher-for-explicit-execution-of-runblockingtest can probably help here

Does anyone have any tips on how to properly manage large data literals in Kotlin tests? I'm writing unit tests for data mapping, so I have to do this: 1. Create test input data 2. Create expected output data 3. Perform mapping 4. Make sure output of the matches matches expected data Problem is that input and/or output data can be big data class with lots of nested data, which means that 95% of the code in the test function is just creating those data classes, creating a big mess. I could move this out of test methods, but every single test method has slightly different data (since it tests different thing), so I cannot have one universal constant with that data class in. I could move the data to resources as some kind of structure (such as JSON), but then I also have to build and maintain deserialization of that data for tests.

Hi, I'm new with kotlin, trying to decide whether I should use Junit or kotlinTest for unit testing. I'm not sure if this is the right forum to ask but, any help? 🙂

Hi, is there an assertion library that nicely highlights diffs between expected and actual values? For instance when comparing two data classes

actual shouldEqual expected

. Currently I'm using Kluent but it just outputs the

toString()

values of both classes. If I want to find out which value(s) are actually different I have to do it manually.

At bit of 👍 would be very great : https://jira.sonarsource.com/browse/SONARSLANG-353. Because today test cases are not push to SonarQube when it’s in koltin 😱

i'm probably blind, but is there somewhere a wiki that explains how to use

kotlin-test-junit

?

Hi people, I’m working with

mockk

and I have an

every

call that returns a list but I’m getting an error

o.mockk.MockKException: Bad recording sequence. Please finalize every { ... } block with returns/answers/just Runs

, I changed to

answers {}

and it worked perfectly and I don’t know why. Does anyone have ever go through this issue?

This may be a basic question, but I need to set up test such that one is called first, and the remaining tests do not continue until the first one completes. They are all asynchronous/ coroutibe based methods...

I have a question if I have an

attachView

and

detachView

on my Presenter do I have to test these methods? Inside of the presenter I have the

loadData

and I have the unit tests for this

loadData

but then I have these methods and I don't know if I have to unit test those or not And then I have a repository that does this

class CryptoListRepositoryImpl(var cryptoCurrencyService: CryptoCurrencyService) : CryptoListRepository {
    override fun getResultData(): Single<CryptoResponse> {
        return cryptoCurrencyService.getCryptoCurrency()
    }
}

do I have to unit test this

getResultData()

? (edited) And then an use case

class GetCryptoListUseCase @Inject constructor(var cryptoListRepository: CryptoListRepository) {
    fun execute(): Single<List<CryptoViewModel>> {
        return cryptoListRepository.getResultData().map {
            cryptoCurrencyMapper(
                it
            )
        }
    }
}

I have to Unit test the

mapper

and the use case

execute()

?