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MockK - mocking framework for Kotlin http://mockk.io

Oleksiy Pylypenko

@oleksiyp

you can try different flavors of clear and unmock

can you paste a code that is failing?

better it's minified version

Anderson Reinkordt

@son1112

I'll have to whip up an example as I am working on proprietary code. It seems to stick with the bottom-most every stub called in the file.

FYI I am also using spek for bdd contexts, so I'm wondering what other kinds of interference might be playing into this

Oleksiy Pylypenko

@oleksiyp

interesting

not sure about spek

never heard anything about interference

Anderson Reinkordt

@son1112

context("with valid data") {
                mockHappyPath()

                it("is successful") {
                    assertEquals(true, baseTransactionSlot.isCaptured)
                    assertEquals(merchantAccountMock, baseTransactionSlot.captured.merchantAccount)
                }
            }
            context("with invalid data") {
                context("with invalid amount") {
                    mockHappyPath(amountValue = 0)

                    it("is not successful") {
                        assertEquals(false, baseTransactionSlot.isCaptured)
                    }
                }
            }

Oleksiy Pylypenko

@oleksiyp

may be

it runs it in parallel

Anderson Reinkordt

@son1112

it's possible

Oleksiy Pylypenko

@oleksiyp

then some way to isolate mocks should exists

alike any other object

Anderson Reinkordt

@son1112

if i switch those mockHappyPaths in which I call variable every stubs, the last one is the one that remains and the failures flip around

I'll look into spek more to see how it runs

Oleksiy Pylypenko

@oleksiyp

the only question is how you store variable for mock

and if it is shared between test

if so you need to somehow split it

and share only code that initialize mock

Anderson Reinkordt

@son1112

val amountMock: Amount = mockk()

every { amountMock.bigDecimalValue() } returns BigDecimal(amountValue)

Oleksiy Pylypenko

@oleksiyp

yes

but where amountMock is placed

in which scope

Anderson Reinkordt

@son1112

beforeEachTest {
                transactionManager.createSale(
                    context = contextMock,
                    amount = amountMock,
                    merchantAccount = merchantAccountMock,
                    callbackUrl = callbackUrl,
                    metadata = metadata,
                    isSignatureRequired = isSignatureRequired,
                    isQuickChipEnabled = isQuickChipEnabled,
                    handler = handlerMock,
                    onComplete = onCompleteMock
                )
            }

Oleksiy Pylypenko

@oleksiyp

probably you need to put mock creation

into this block

beforeEachTest

Anderson Reinkordt

@son1112

interesting

will try that

Oleksiy Pylypenko

@oleksiyp

you can always create some function that accepts mock and do the same thing

I mean

do a same sequence of every to intialize mock

but with creating and storing mock itself you need to be careful

as spek probably indeed run it in parallel

Ashutosh

@apendse

I have written a few tests in Android where I am using Mockk to mock some objects. I am running into an issue that when I run the whole test suite, the tests fail with a crash but when I run each test separately, it works fine. Is there some cleanup required between the tests?

Ashutosh

@apendse

The stack trace shows that Mockk injects a class that acts like contextWrapper and that's causing the failure.

Oleksiy Pylypenko

@oleksiyp

It might be the case that some classes are crtitical to the system and mocking them going to cause instability. Please minimize your example and submit it as a github issue if you think this should be fixed in the future

asaidalaoui

@asaidalaoui

Hello I am new to using Mockk.

I am trying to mock an object however I keep getting the following error io.mockk.MockKException: Missing calls inside every { ... } block.

I am guessing this should be pretty straight forward

@BeforeEach
    fun setup() {
        mockkObject(FilterFactory)
    }

    @Test
    fun `should return an unmatched filter result if there is no context match`() {
        every { FilterFactory.getFilters("invalid") } returns emptyList()
    }

Andriy Matkivskiy

@amatkivskiy

Hi all, is there any way to verify that every call mocked with every { } was called ?

As far as I know such approach is implemented in Mockito and called strict mode

Andriy Matkivskiy

@amatkivskiy

Is there any similar functionality in Mockk?

Joakim Forslund

@Syrou

So Im trying to mockk a class which has constructor parameters, it seems like mockk is not able to override these variables for som reason because they are empty when I later try to use a method to log if they have been set or not.
How do I create a mockked class what I also have specified constructor parameters on?

Oleksiy Pylypenko

@oleksiyp

This is not implemented yet

iulianrosca

@iulianrosca

Hello, I have the following question related to returning an instance of a final class from a spyk. I have the following code:

val foo = Foo()
val spyFoo = spyk(foo)
val instanceOfFinalBar = BarFactory.createInstance() // interop with final Java class with package private constructors
every {spyFoo.bar } returns instanceOfFinalBar

The above fails with:

java.lang.VerifyError
    at sun.instrument.InstrumentationImpl.retransformClasses0(Native Method)
    at sun.instrument.InstrumentationImpl.retransformClasses(InstrumentationImpl.java:144)
    at io.mockk.proxy.jvm.transformation.JvmInlineInstrumentation.retransform(JvmInlineInstrumentation.kt:28)
    at io.mockk.proxy.common.transformation.RetransformInlineInstrumnetation$execute$1.invoke(RetransformInlineInstrumnetation.kt:19)
    at io.mockk.proxy.common.transformation.RetransformInlineInstrumnetation$execute$1.invoke(RetransformInlineInstrumnetation.kt:6)

Any clues what I'm doing wrong? I assume it's related to the fact that Bar is final. I was expecting you cannot mock a final class, but you can return an instance of a final class from a mock.

Mark Robinson

@MarkRobbo

Hi - trying to mock a call to Clock.instant() to return progressively increasing Instants (in a more generic way, returning subsequently different answers for the same call). Is this possible with mockk?

Mark Robinson

@MarkRobbo

Never mind found it, returnsMany or andThen

Stanislav Kinzl

@mageRabbitStudios

Hello, I'm trying to add mockk-android dependency of version 1.9.3 for some time now. I want it in order to statically mock getCurrentTimeMillis function in System, so I can override the current time the device returns, so I can snapshot test some cards we have in our app in different states (expires soon etc...). But I'm unable to do that because every time I try to sync project after adding the 'androidTestImplementation "io.mockk:mockk-android:1.9.3"' into the gradle, I get "Unable to resolve dependency" error. I don't get the error for normal mockk (I already used it in the project). I'm I missing something? Thank you.

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