Hi there. What is the preferred way of mocking App...

# ktor

[Jakub Gwóźdź]

Hi there. What is the preferred way of mocking ApplicationCall?

I don’t want to create whole testApplication { … } , but I have a method that is simply

suspend fun readPartsContents(call: ApplicationCall): List<UploadedContent> = call
    .receiveMultipart()
    .readAllParts()
    .flatMap(::processPart)

and I’d like to mock that call in my unit test. But I can’t since .receiveMultipart() is unmockable extension function…

[Jakub Gwóźdź]

ok nvm, apparently it’s possible to mock extension functions as well, using mockkStatic:

val call: ApplicationCall = mockk()
val multiPartData: MultiPartData = mockk()
val input: Input = mockk()
val zipPart = PartData.FileItem({ input }, { input.release() }, partHeaders(Application.Zip, "zip/random.zip"))

mockkStatic(ApplicationCall::receiveMultipart)
mockkStatic(MultiPartData::readAllParts)
mockkStatic(Input::asStream)

coEvery { call.receiveMultipart() } returns multiPartData
coEvery { multiPartData.readAllParts() } returns listOf(zipPart)
every { input.asStream() } returns randomZip.inputStream()
justRun { input.release() }