Metodo como parametro

MethodParameterTest.kt

package util

import org.junit.Before
import org.junit.Test
import org.mockito.Mockito.*
import kotlin.reflect.KFunction1

class MethodParameterTest {

    private lateinit var mock: IPresenter

    @Before fun setup() {
        mock = mock(IPresenter::class.java)
    }

    @Test fun whenExecute_shouldClick() {
        val temMock = TemMock(mock)
        temMock.executa()
        validaClick(IPresenter::click, verify(mock))
    }

    @Test fun whenExecute_shouldNotDouble() {
        val temMock = TemMock(mock)
        temMock.executa()
        validaClick(IPresenter::double, verify(mock, never()))
    }

    private fun validaClick(kFunction1: KFunction1<IPresenter, Unit>, mock: IPresenter) {
        kFunction1.invoke(mock)
    }

}

class TemMock(private val presenter: IPresenter) {
    fun executa() {
        presenter.click()
    }
}

interface IPresenter {
    fun click()
    fun double()
}

open class Presenter: IPresenter {
    override fun click() {
        println("click")
    }

    override fun double() {
        println("double")
    }
}