Kotlin: This is how one can use parameterized tests along with Mockito-kotlin to provide cyclic tests of Event Handlers

VfxSetUserTest.kt

package com.gdetotut.login

import com.nhaarman.mockito_kotlin.argumentCaptor
import com.nhaarman.mockito_kotlin.eq
import org.junit.Test
import org.junit.runner.RunWith
import org.junit.runners.Parameterized

import java.util.Arrays

import org.junit.Assert.assertEquals

/**
 * This is cyclic test with parameters. So we use parameterized concept.
 */
@RunWith(Parameterized::class)
class VfxSetUserTest(private val index: Int, private val state: VfxUser.State) {

    /**
     * We set various parameter for [VfxModel.setUser] and await parameterized result.
     */
    @Test
    fun testModel() {
        val service = VfxModel
        val event = com.nhaarman.mockito_kotlin.mock<VfxModel.OnEventListener>()
        service.listener = event

        service.setUser(index)
        val captor = argumentCaptor<VfxUser>()
        com.nhaarman.mockito_kotlin.verify(event).onUserChanged(captor.capture(), eq(""))
        val captured = captor.firstValue
        assertEquals(state, captured.state)
    }

    companion object {

        @JvmStatic
        @Parameterized.Parameters(name = "{index}: param = {0}, res = {1}")
        fun data() : Collection<Array<Any>> {
            return listOf(
                    arrayOf(0, VfxUser.State.US_GodMode),
                    arrayOf(1, VfxUser.State.US_Disp),
                    arrayOf(2, VfxUser.State.US_Admin),
                    arrayOf(3, VfxUser.State.US_NotReg),
                    arrayOf(10, VfxUser.State.US_NotReg),
                    arrayOf(-1, VfxUser.State.US_NotReg)
            )
        }

    }


}