import scala.concurrent._

import scala.concurrent.duration._

import ExecutionContext.Implicits.global

import scala.language.postfixOps 

import scala.language.reflectiveCalls

lazy val f = Future {

  import CW8b._

  assert(sread(Map(), 2) == 0)

  assert(sread(Map(2 -> 1), 2) == 1)

  assert(write(Map(), 1, 2) == Map(1 -> 2))

  assert(write(Map(1 -> 0), 1, 2) == Map(1 -> 2))

}

Await.result(f, 120 second)