how to stub kotlin map function | unittest

Question

i want to stub kotlin's map extension function in my unit test. couldn't find any proper solution on internet to do that.

ctually i have put empty blocks inside curly brackets but it seems like this is not the way that i should do.

here is what i have been trying so far:

whenever(trainWorkoutResult.exerciseSections.map {}).thenReturn(trainSections)

here is the error that i got:

no answer found for: 

    LegacyDataMapper(#4).mappingSectionsToRecordedExerciseDataModels(Mock for List, hashCode: 1199894489)

any idea?

You cannot and should not. You can stub the function you pass to map, but not map itself, and a good thing too. — Louis Wasserman
– Louis Wasserman, Commented Mar 27, 2023 at 17:28

kokoko · Accepted Answer · 2023-03-28 08:50:00Z

0

solved it like that:

 with(mockk<List<Section>>()) {
                every {
                    trainWorkoutResult.exerciseSections
                } returns (listOf(Section(12, "123", emptyList())))
            }

inspired by this question.

ps: i am using mockk library

answered Mar 28, 2023 at 8:50

kokoko

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