1 

     2 import scala.concurrent._

     3 import scala.concurrent.duration._

     4 import ExecutionContext.Implicits.global

     5 import scala.language.postfixOps 

     6 import scala.language.reflectiveCalls

     7 

     8 lazy val f = Future {

     9   import CW8b._

    10 

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

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

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

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

    15 }

    16 

    17 Await.result(f, 120 second)