Does anyone here have any experience mocking an ex...

# server

[Justin (Midas) Gilman]

Does anyone here have any experience mocking an extension function and capturing the lambda parameter? I am using Mockk and I'm getting this error

java.lang.AbstractMethodError: Receiver class kotlin.jvm.functions.Function1$Subclass0 does not define or inherit an implementation of the resolved method 'abstract java.lang.Object invoke(java.lang.Object)' of interface kotlin.jvm.functions.Function1.

Here's my test:

@Test
    fun `attempt 2`() {
        val routing = mockk<Routing>(relaxed = true)

        val configure = slot<Route.() -> Unit>()
        val mockedRoute = mockk<Route>()

        every { any<Route>().static(capture(configure)) } answers {
            configure.captured.invoke(mockedRoute)
            mockedRoute
        }

        var testObj = ResourcePortalModuleRouter(routing, node)
        testObj.attachPortalCoreRoutes()

        verify {
            mockedRoute.default("index")
        }
    }

The error is thrown on the every line, and I don't understand why this isn't working

[Tobias Berger]

Usually, if you want to mock static/top level functions, you need to register it with mockkstatic("<file class qualified name>") , so if you have a file called MyExtensions.kt in package com.example.myapp you would write mockkstatic("com.example.myapp.MyExtensionsKt").
I'm not 100% sure about mocking extensions in combination with the any-matcher, but that shouldn't make a difference when I think about it.

[ephemient]

you should be able to mockkStatic(Routing::static) instead of relying on the class name

[ephemient]

https://mockk.io/#extension-functions (as recently discussed in #mockk, https://kotlinlang.slack.com/archives/C9EJFT6DB/p1632314539012400?thread_ts=1632314384.011700&cid=C9EJFT6DB)

[Justin Gilman]

Awesome, thanks all for the help. I will give mockkStatic a try