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mockk

arild

09/23/2019, 1:12 PM

Could I solicit some opinions on

private val someMockedDependency: SomeClass = mockk()

@MockK private lateinit var someMockedDependency: SomeClass

Big Chungus

10/01/2019, 8:32 AM

Hello, is there a way to mock this interface in common module:

external interface DElement : DNode {
}

Cody Engel

10/08/2019, 10:45 PM

What’s the difference between

clearAllMocks

and

unmockkAll

? I have the following test rule and when I used

clearAllMocks

in the finished function I was seeing some tests failing because a

mockkObject

wasn’t being cleared. With

unmockkAll

though it resolved the issue.

class MockKTestRule(private val target: Any) : TestWatcher() {
    override fun starting(description: Description?) {
        super.starting(description)
        MockKAnnotations.init(target)
    }

    override fun finished(description: Description?) {
        unmockkAll() // clearAllMocks doesn't work for all use cases
        super.finished(description)
    }
}

But I don’t understand what the difference is? When would I want to use

clearAllMocks

over

unmockkAll

rkeazor

10/17/2019, 1:49 AM

Can mockk mock channels

Yeray Cabello

10/23/2019, 6:54 AM

Hi, I'm trying to mock a static method that takes a

() -> Unit

function as a parameter, but the matchers seem not to be able to get the mocking signature:

io.mockk.MockKException: Failed matching mocking signature for

left matchers: [any()]

What am I missing? I know that equality with lambdas can be a nightmare, but can't seem to find documentation on this.

Untitled.kt

poohbar

10/30/2019, 1:28 PM

@Before
fun setup() {

val instant = Instant.ofEpochMilli(1572400000000)
mockkStatic(Instant::class) {
    every { Instant.now() } returns instant
}

}

Dennis Schröder

11/04/2019, 3:18 PM

Is it possible to mock inner Classes yet?

LeoColman

11/20/2019, 4:16 PM

Yeah, this smells bad code all over it, but it's for legacy code that I want well tested before I refactor

Samuel Michael

11/20/2019, 9:37 PM

Im new to mockkito so this is probably a dumb question but how do i avoid this?

Mark McCormick

11/27/2019, 3:13 PM

~~Hey guys~~ 👋 I have some logic inside the
init
block in my
ViewModel
. I would like to set some expected behavior of a mock I have inside the
init
block like this
every { repository.getSomething() } returns SomeEnum.A
. The problem is this expected answer is executed after the
init
block. If I put the
every { ... }
part to
@Before
function it works fine, but I would like to set this expected answer only for one specific test. Any ideas?

alostpacket

12/23/2019, 2:53 AM

@antoniomarin what happens if you replace

any<String>()

with just

String

Kris Wong

12/23/2019, 8:14 PM

has anyone seen this before?

Untitled

kyleg

12/25/2019, 8:10 PM

Aha. If I have top-level

foo: (File)->Long

I want to mock, and top-level (same file)

caller: (foo: (File)->Long)->Int

that I do not want to mock, then that file needs

@file:JvmName("FooKt") ; package <http://path.to|path.to>

up top, and then in the test:

with(::caller) {
            mockkStatic("path.to.FooKt")
            every { foo(any()) } returns 0L

            this(::foo)

            verify { foo(File("/path/to/thing") }
        }

antoniomarin

01/16/2020, 1:38 PM

Hi all, beginner question here. Is it possible that production code method changes mock? I’ve got following:

// PRODUCTION
class classUnderTest(
    private val preferences: Preferences
) {

    fun changePreferenceToTrue() {
        preferences.somePreference = true        
    }
}

// TEST
@Test
fun `Given preference false when changePreferenceToTrue then check is preference updated`() {
    every { preferences.somePreference } returns false

    classUnderTest.changePreferenceToTrue()
    
    // I want to assert that this Preference is true
    print(preferences.somePreference) // always returns as defined above, in this case false
}

voben

01/23/2020, 4:47 AM

What’s the difference between using

every {} returns something

and

every {} answers {something}

voben

02/08/2020, 8:51 PM

I’m trying to test my repo which looks something like this. The issue is I’m not quite sure how to deal with the FirebaseInstanceId. Is this something I can mock, if so how would I do that?

class Repository(private val service: RetrofitService) {

    suspend fun sendToken() {
        val result = FirebaseInstanceId.getInstance().instanceId.await()
        service.sendTokenToServer(result.token)
    }

}

ivano

02/14/2020, 2:28 PM

I get an error because the implementation expects that the data class is parcelable, and I cannot mock the @Parcelize

John Gainfort

02/25/2020, 11:10 PM

java.lang.ExceptionInInitializerError
	at scte35decoder.Scte35DecoderTests.mockBase64Decoder(Scte35DecoderTests.kt:44)
	at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
	at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.base/java.lang.reflect.Method.invoke(Method.java:566)
	at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:50)
	at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12)
	at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:47)
	at org.junit.internal.runners.statements.RunBefores.evaluate(RunBefores.java:24)
	at org.junit.runners.ParentRunner.runLeaf(ParentRunner.java:325)
	at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:78)
	at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:57)
	at org.junit.runners.ParentRunner$3.run(ParentRunner.java:290)
	at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:71)
	at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:288)
	at org.junit.runners.ParentRunner.access$000(ParentRunner.java:58)
	at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:268)
	at org.junit.runners.ParentRunner.run(ParentRunner.java:363)
	at org.gradle.api.internal.tasks.testing.junit.JUnitTestClassExecutor.runTestClass(JUnitTestClassExecutor.java:110)
	at org.gradle.api.internal.tasks.testing.junit.JUnitTestClassExecutor.execute(JUnitTestClassExecutor.java:58)
	at org.gradle.api.internal.tasks.testing.junit.JUnitTestClassExecutor.execute(JUnitTestClassExecutor.java:38)
	at org.gradle.api.internal.tasks.testing.junit.AbstractJUnitTestClassProcessor.processTestClass(AbstractJUnitTestClassProcessor.java:62)
	at org.gradle.api.internal.tasks.testing.SuiteTestClassProcessor.processTestClass(SuiteTestClassProcessor.java:51)
	at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
	at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.base/java.lang.reflect.Method.invoke(Method.java:566)
	at org.gradle.internal.dispatch.ReflectionDispatch.dispatch(ReflectionDispatch.java:36)
	at org.gradle.internal.dispatch.ReflectionDispatch.dispatch(ReflectionDispatch.java:24)
	at org.gradle.internal.dispatch.ContextClassLoaderDispatch.dispatch(ContextClassLoaderDispatch.java:33)
	at org.gradle.internal.dispatch.ProxyDispatchAdapter$DispatchingInvocationHandler.invoke(ProxyDispatchAdapter.java:94)
	at com.sun.proxy.$Proxy2.processTestClass(Unknown Source)
	at org.gradle.api.internal.tasks.testing.worker.TestWorker.processTestClass(TestWorker.java:118)
	at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
	at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.base/java.lang.reflect.Method.invoke(Method.java:566)
	at org.gradle.internal.dispatch.ReflectionDispatch.dispatch(ReflectionDispatch.java:36)
	at org.gradle.internal.dispatch.ReflectionDispatch.dispatch(ReflectionDispatch.java:24)
	at org.gradle.internal.remote.internal.hub.MessageHubBackedObjectConnection$DispatchWrapper.dispatch(MessageHubBackedObjectConnection.java:182)
	at org.gradle.internal.remote.internal.hub.MessageHubBackedObjectConnection$DispatchWrapper.dispatch(MessageHubBackedObjectConnection.java:164)
	at org.gradle.internal.remote.internal.hub.MessageHub$Handler.run(MessageHub.java:412)
	at org.gradle.internal.concurrent.ExecutorPolicy$CatchAndRecordFailures.onExecute(ExecutorPolicy.java:64)
	at org.gradle.internal.concurrent.ManagedExecutorImpl$1.run(ManagedExecutorImpl.java:48)
	at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1128)
	at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:628)
	at org.gradle.internal.concurrent.ThreadFactoryImpl$ManagedThreadRunnable.run(ThreadFactoryImpl.java:56)
	at java.base/java.lang.Thread.run(Thread.java:834)
Caused by: java.lang.IllegalStateException: Error during attachment using: net.bytebuddy.agent.ByteBuddyAgent$AttachmentProvider$Compound@49aca0a6
	at net.bytebuddy.agent.ByteBuddyAgent.install(ByteBuddyAgent.java:427)
	at net.bytebuddy.agent.ByteBuddyAgent.install(ByteBuddyAgent.java:401)
	at net.bytebuddy.agent.ByteBuddyAgent.install(ByteBuddyAgent.java:353)
	at net.bytebuddy.agent.ByteBuddyAgent.install(ByteBuddyAgent.java:330)
	at io.mockk.proxy.jvm.JvmMockKAgentFactory.initInstrumentation(JvmMockKAgentFactory.kt:134)
	at io.mockk.proxy.jvm.JvmMockKAgentFactory.init(JvmMockKAgentFactory.kt:34)
	at io.mockk.impl.JvmMockKGateway.<init>(JvmMockKGateway.kt:46)
	at io.mockk.impl.JvmMockKGateway.<clinit>(JvmMockKGateway.kt:172)
	... 48 more
Caused by: <http://java.io|java.io>.IOException: Cannot run program ""/Applications/IntelliJ IDEA <http://CE.app/Contents/jbr/Contents/Home/bin/java%22%22|CE.app/Contents/jbr/Contents/Home/bin/java"">: error=2, No such file or directory
	at java.base/java.lang.ProcessBuilder.start(ProcessBuilder.java:1128)
	at java.base/java.lang.ProcessBuilder.start(ProcessBuilder.java:1071)
	at net.bytebuddy.agent.ByteBuddyAgent.installExternal(ByteBuddyAgent.java:485)
	at net.bytebuddy.agent.ByteBuddyAgent.install(ByteBuddyAgent.java:420)
	... 55 more
Caused by: <http://java.io|java.io>.IOException: error=2, No such file or directory
	at java.base/java.lang.ProcessImpl.forkAndExec(Native Method)
	at java.base/java.lang.ProcessImpl.<init>(ProcessImpl.java:340)
	at java.base/java.lang.ProcessImpl.start(ProcessImpl.java:271)
	at java.base/java.lang.ProcessBuilder.start(ProcessBuilder.java:1107)
	... 58 more

John Gainfort

02/25/2020, 11:10 PM

Im trying to use Mockk with a Kotlin Multi Platform library that I am making. However I can’t seem to get it to work. In my commonMain I have an interface defined

interface Foo { fun bar(val: String): ByteArray }

then in my commonTest I am trying to mock Foo

val mockedFoo = mockk<Foo> { every { bar("test") } returns ByteArray(1) }

my build.gradle.kts has

val commonTest by getting {
            dependencies {
                implementation(kotlin("test-common"))
                implementation(kotlin("test-annotations-common"))
                implementation("io.mockk:mockk:1.9.3")
                implementation("io.mockk:mockk-common:1.9.3")
            }
        }

but when I go to run a test I get this error that I am having a hard time figuring out.

Joan Colmenero

03/03/2020, 11:53 AM

I'm trying to remove the

withContext

from my viewModel and I'm planning to put it on the

usecase

repository

something like this

launch{
 updateView()
 withContext(<http://Dispatchers.IO|Dispatchers.IO>){
   doLogin(username,password)
 }
 updateView()
}

This is how I'm doing it now ^ Then if I want to remove the

withContext(<http://Dispatchers.IO|Dispatchers.IO>)

I can do it like this

suspend fun doLogin(usernarme: String, password: String) = <http://Dispatchers.IO|Dispatchers.IO> { repo.doLogin(username,password)... }

So, is there any way to test it correctly? I'm using

mockK

so, I know with

coEvery

is going to work, but is it safe to do not put

Dispatchers.Uncofined

for testing purposes? Also do you think it's a good idea to do not change context on viewModel and then just do this

launch {
 updateView()
 doLogin(username,password)
 updateView()
}

Kris Wong

03/04/2020, 6:52 PM

i see it's been a year since the last release. is this project dead?

Kulwinder Singh

03/10/2020, 1:30 PM

for MockK, i'm getting

MockKException: no answer found for: MyClass(#1).sendMessage(okhttp3.RequestBody$2@4ed4bd33)

, actually RequestBody's properties are same just instance is different. that's why it did not matches parameters but if i add

any()

instead of requestbody it works. is there anything else i can use instead of

any()

here ?

every {	myClass.sendMessage(MockRequest.createTestBody(value="text")) } answers { something }

....

class SomeObject(myClass:MyClass){
	fun doSomething(text: String): Flowable<Result<Boolean>> {
        val request = MockRequest.createTestBody(text)
		myClass.sendMessage(request)
	}
}
....

i have checked documentation of mockk but didn't found anything, that's why asked here:

Erik

03/19/2020, 5:33 PM

Latest stable releases of mockk-patterns: - For JUnit 4 (e.g. Android):

testImplementation("com.github.erikhuizinga:mockk-junit4:1.0.0")

- For JUnit 5:

testImplementation("com.github.erikhuizinga:mockk-junit5:2.0.0")

- For kotest a PR has been opened by @Sourabh Rawat, which I've reviewed.

Ellen Spertus

03/25/2020, 12:15 AM

I’m having a problem with MockK and JUnit5 in Android development. Here is my code:

private fun makeResolveInfo(appName: String, packageName: String, exported: Boolean = true) :
    ResolveInfo {
  val activityInfo = mockk<ActivityInfo>()
  every { activityInfo.exported } returns exported
  // remaining code omitted

The program crashes on the line with

every

io.mockk.MockKException: Missing calls inside every { ... } block.
	at io.mockk.impl.recording.states.StubbingState.checkMissingCalls(StubbingState.kt:14)
	at io.mockk.impl.recording.states.StubbingState.recordingDone(StubbingState.kt:8)
	at io.mockk.impl.recording.CommonCallRecorder.done(CommonCallRecorder.kt:47)
	at io.mockk.impl.eval.RecordedBlockEvaluator.record(RecordedBlockEvaluator.kt:60)
	at io.mockk.impl.eval.EveryBlockEvaluator.every(EveryBlockEvaluator.kt:30)
	at io.mockk.MockKDsl.internalEvery(API.kt:92)
	at io.mockk.MockKKt.every(MockK.kt:104)
	at mozilla.voice.assistant.intents.MetadataTest$Companion.makeResolveInfo(MetadataTest.kt:61)

Any idea what I’m doing wrong? The file is in a

test

directory rather than

androidTest

. I don’t know if that could be a problem.

Dave Leeds

03/27/2020, 8:29 PM

Hey all. I’m looking for ways to mock Ktor’s HttpClient with mockk for unit tests. I’ve tried the usual approach:

coEvery { httpClient.hint(MyPayload::class).get<MyPayload>(any<String>()) }.returns(examplePayload)

But this fails with a class cast exception:

MyPayload cannot be cast to io.ktor.client.call.HttpClientCall

I suspect the reason for this is that the entire call stack between the test and

HttpStatement.executeUnsafe()

is made up of

inline

functions. I tried to mock

httpClient.execute()

since that’s ultimately what gets invoked, but that’s marked as

@InternalAPI

. Any ideas?

Kris Wong

04/22/2020, 6:37 PM

I am having a strange issue with an object mock. given:

mockkObject(AppLockedState)
        every { AppLockedState.isLocked() } answers { locked }

it seems to be executing the

isLocked

method rather than using the answer. it's complaining that Boolean can't be cast to one of the types being used in the method implementation

Kris Wong

04/23/2020, 2:11 PM

how am I supposed to mock methods that take complex/abstract types, or types that expect certain properties to be non-null, etc...?

Kris Wong

04/23/2020, 2:22 PM

mockkObject(IntentQueueFactory)
        every { IntentQueueFactory.getInstance(context) } returns queue

causes

io.mockk.MockKException: Missing calls inside every { ... } block.
at io.mockk.impl.recording.states.StubbingState.checkMissingCalls(StubbingState.kt:14)
at io.mockk.impl.recording.states.StubbingState.recordingDone(StubbingState.kt:8)
at io.mockk.impl.recording.CommonCallRecorder.done(CommonCallRecorder.kt:47)
at io.mockk.impl.eval.RecordedBlockEvaluator.record(RecordedBlockEvaluator.kt:60)
at io.mockk.impl.eval.EveryBlockEvaluator.every(EveryBlockEvaluator.kt:30)
at io.mockk.MockKDsl.internalEvery(API.kt:92)
at io.mockk.MockKKt.every(MockK.kt:98)

Kris Wong

04/23/2020, 2:55 PM

I found this framework to be pretty interesting when getting started with it, but unless I am missing something here, it doesn't seem to support anything beyond the most basic use cases

Alex Kuznetsov

05/01/2020, 5:59 PM

Is there a way to have a multi-line

mockk

statement: I'd like to spread a long statement like the following over several lines:

every { <http://myThing.do|myThing.do>() } returns 1 andThenThrows Exception("No way!") andThen 3 andThen 4

the line gets too wide, is there a way to continue it:

every { <http://myThing.do|myThing.do>() } returns 1 
  andThenThrows Exception("No way!") 
  andThen 3 
  andThen 4

TIA!

Title

Alex Kuznetsov

05/01/2020, 5:59 PM

Is there a way to have a multi-line

mockk

statement: I'd like to spread a long statement like the following over several lines:

every { <http://myThing.do|myThing.do>() } returns 1 andThenThrows Exception("No way!") andThen 3 andThen 4

the line gets too wide, is there a way to continue it:

every { <http://myThing.do|myThing.do>() } returns 1 
  andThenThrows Exception("No way!") 
  andThen 3 
  andThen 4

TIA!

jdiaz

05/02/2020, 7:32 PM

There's no way to do it with infix functions but iirc you can still use the dot notation like

returns(1).andThenThrows(...).andThen(3)

and then you can format it as you want

👍 1

Alex Kuznetsov

05/18/2020, 9:35 PM

@jdiaz thanks a lot

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