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Questions tagged [mockk]

Mockk is a free, open source mocking framework for Kotlin programming language. With some features similar to Mockito and Powermock, Mockk enables Kotlin developers to mock Kotlin features with a simple DSL, allowing for simple and concise testing code.

Mockk is a Mocking library that enables developers to test their code with a simple DSL. With familiar features from and , Mockk enables developers to test their / code in a simple but powerful fashion.

val car = mockk<Car>()

every { car.drive(Direction.NORTH) } returns Outcome.OK

car.drive(Direction.NORTH) // returns OK

verify { car.drive(Direction.NORTH) }
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Mockk Mocking Private Properties in Kotlin

I have a simple class with a private field. class EmployeeData { private var employeeAge: Int = 0 fun getAge(): Int { return 1 + employeeAge } } I am trying to test this private employeeAge with the following from official…
user3949888
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How to test a presenter MVP Android

I'm trying to understand how should I test my app, I'm still learning with mockito I also saw mockk but couldn't make it work, this is my Presenter class MyPresenterImpl @Inject constructor(var myUseCase: MyUseCase) : MyContract.Presenter { …
StuartDTO
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How to mock a new object using mockk

I'm trying to write unit tests using mockk. I'm trying to figure out how to mock a new instance of an object. For example, using PowerMockito we would write: PowerMockito.whenNew(Dog::class.java).withArguments("beagle").thenReturn(mockDog) If the…
Scott
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Exception in thread "Test worker" java.lang.IllegalStateException: Module with the Main dispatcher had failed to initialize

Hey I am getting this kind of weird issue. I don't understand why this is causing in my unit test. Can someone please guide me what is missing in my side. Exception in thread "Test worker" java.lang.IllegalStateException: Module with the Main…
Kotlin Learner
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Why is Robolectric 4.4 breaking my MockK tests

My current Android Application employs MockK in its junits All my tests runs as expected and with testImplementation 'org.robolectric:robolectric:4.3' However when I increase the version to testImplementation 'org.robolectric:robolectric:4.4' all my…
Hector
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How to run lambda function passed to a mockked method?

I wonder whather it's possible to run a lambda function passed as a parameter to a mocked function. And run it whenever the mocked method is called. I am using Mockk and I imagine the code to be something like this: class DataManager { fun…
David Holkup
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Android Kotlin Unit test failing with io.mockk.MockKException: no answer found for

EDIT: For future readers. I don't know if this question will help you very much.The logic of the fun has changed drastically so I am closing the question, but won't delete it. I am trying to write some unit tests for my ViewModel. I am using Mockk…
Sir Isaac
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Match argument object that has a property equal to (using Mockk)

I have looked around for a similar question, but cannot find a solution. I have a couple of instances to the same type of object. As a simple example, a Pen object. This class contains size (Int) and color (String) properties. I need to mock a…
GiH
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Using mockk to match any varargs

I'm trying to mock an Android Context to return a string from a resource id. However I have trouble matching the stub to the call, I assume it is because of the varargs. However I am new to mockk so I might just miss something very easy. I mock the…
findusl
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java.lang.IllegalStateException: Could not find sun.misc.Unsafe while @MockK

I'm having an issue when creating a mock using MockK. I have tried with kotlin 1.2.* version with MockK without Kotlin 1.3 but it also didn't help. How can I resolve this? Is this because of OpenJDK 11 of it's something else? Java version: openjdk…
lukaszrys
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MockK mock ViewModel's savedStateHandle.getLiveData()

I'm trying to test this ViewModel with savedStateHandle class PostListViewModel @ViewModelInject constructor( private val coroutineScope: CoroutineScope, private val getPostsUseCase: GetPostListUseCaseFlow, @Assisted savedStateHandle:…
Thracian
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Why is mocking so slow to start in Kotlin?

Can anyone tell me why mocking "startup" is so slow in Kotlin? The first test that uses mocks takes seconds (2-3 with mockk and 1-2 with Mockito). The rest take milliseconds. There is no such overhead in Java with Mockito. Way to reproduce: Write…
Paweł Krupiński
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mockk java.lang.AssertionError: Verification failed: call 1 of 1: was not called

I'm running a unit test using mockk. When trying to verify a method, I'm getting an assertionError and I can't figure out how to get the test to run. Here is my test method: @get:Rule var rule: TestRule = InstantTaskExecutorRule() val…
Kristy Welsh
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Mockk - spyk mock method only once

I have spyk from mockk library: my = spyk(My()) later I am mocking one of the method to return something like: every { my.method("someString") } returns something I'm creating this spyk in a @BeforeAll method and I'm reusing it a few times but,…
Ice
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How to test through io.mockk a method that was called several times with different parameters?

PS: Code will be in Koltin For example, I have my service class that does something and injects some other service. class MyService( private val someOtherService: OtherService ) { fun doSomething() { someOtherService.someMethod("foo") …
Seydazimov Nurbol
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