3 import scala.concurrent._

     2 assert(get_prices(List("BIDU"), 2004 to 2008) == List(List(None), List(None), 

     4 import scala.concurrent.duration._

     3                                                       List(Some(6.35)), List(Some(12.241)), 

     5 import ExecutionContext.Implicits.global

     4                                                       List(Some(38.188))))

     6 import scala.language.postfixOps 

     7 

     8 lazy val f = Future {

     9   assert(get_prices(List("BIDU"), 2004 to 2008) == List(List(None), List(None), 

    10                                                         List(Some(6.35)), List(Some(12.241)), 

    11                                                         List(Some(38.188))))

    12 }