PromotionListViewRobot.kt

class PromotionListViewRobot(presenter: PromotionListContract.Presenter) {

    private val initSubject = BehaviorSubject.create<Any>()

    private val renderedViewStates: MutableList<PromotionListContract.ViewState> = mutableListOf()

    private val view: PromotionListContract.View = object : PromotionListContract.View {
        override fun listInit(): Observable<Any> = initSubject

        override fun render(viewState: PromotionListContract.ViewState) {
            renderedViewStates.add(viewState)
        }
    }

    init {
        presenter.attachView(view)
    }

    fun start() {
        initSubject.onNext(Any())
    }

    fun checkStatesRendered(function: (List<PromotionListContract.ViewState>) -> Unit) {
        function(renderedViewStates)
    }
}