Can someone please explain this behaviour to me? ...

# mockk

[svenjacobs]

Can someone please explain this behaviour to me?

class CouponListInteractor(
    private val isCouponSelectedUseCase: IsCouponSelectedUseCase
) {

    suspend fun isCouponSelected(uuid: String) = isCouponSelectedUseCase.execute(uuid)
}

object CouponListInteractorTest : Spek(
    {
        val isCouponSelectedUseCase by memoized {
            mockk<IsCouponSelectedUseCase> {
                coEvery { execute(any()) } returns false
                coEvery { execute("uuid") } returns true
            }
        }
        
        val interactor = CouponListInteractor(
            isCouponSelectedUseCase
        )

        describe("CouponListInteractor") {

        context("isCouponSelected") {

            it("should return coupon selected state") {
                runBlockingTest {
                    interactor.isCouponSelected("uuid") shouldEqual true
                }

                coVerify {
                    // ERROR: Bad recording sequence. State: AnsweringState 
                    isCouponSelectedUseCase.execute("uuid")
                }
            }
        }
    }
}

coVerify produces Bad recording sequence. State: AnsweringState. However when I replace interactor.isCouponSelected("uuid") shouldEqual true with isCouponSelectedUseCase.execute("uuid") shouldEqual true the test runs. isCouponSelected() just delegates to the use case. I don't understand this behaviour? 🤯

[svenjacobs]

Sorry, my bad. It had actually nothing to do with MockK. The problem was that I forgot to put by memoized {} around CouponListInteractor so the same instance was used for all tests and something got mixed up internally.