1 

     2 import scala.concurrent._

     3 import scala.concurrent.duration._

     4 import ExecutionContext.Implicits.global

     5 import scala.language.postfixOps 

     6 

     7 lazy val f = Future {

     8   assert(legal_moves(8, Nil, (2,2)) == 

     9              List((3,4), (4,3), (4,1), (3,0), (1,0), (0,1), (0,3), (1,4)))

    10   assert(legal_moves(8, Nil, (7,7)) == List((6,5), (5,6)))

    11   assert(legal_moves(8, List((4,1), (1,0)), (2,2)) == 

    12              List((3,4), (4,3), (3,0), (0,1), (0,3), (1,4)))

    13   assert(legal_moves(8, List((6,6)), (7,7)) == List((6,5), (5,6)))

    14   assert(legal_moves(1, Nil, (0,0)) == List())

    15   assert(legal_moves(2, Nil, (0,0)) == List())

    16   assert(legal_moves(3, Nil, (0,0)) == List((1,2), (2,1)))

    17 }

    18 

    19 Await.result(f, 120 second)