poll_exception.kt

class PollableViewModel {
    
    fun startPolling(): Observable<Long> =
        Observable.interval(1, TimeUnit.SECONDS)
            .map { it / 0 } // throws ArithmeticException: / by zero
}

class PollableView(private val pollable: PollableViewModel) {
    
    private fun poll() {
        pollable.startPolling()
            .subscribe {
                refreshView()
            }
    }
}