Direction.scala

object Direction extends Enumeration {
  type Direction = Value
  val NORTH, EAST, SOUTH, WEST, NONE = Value

  def getFromShortName(shortName: Char): Direction = shortName match {
    case 'N' => NORTH
    case 'E' => EAST
    case 'S' => SOUTH
    case 'W' => WEST
    case _ => NONE
  }
  
  def turnLeft(d: Direction): Direction = d match {
    case NORTH => WEST
    case EAST => NORTH
    case SOUTH => EAST
    case WEST => SOUTH
    case _ => NONE
  }

  def turnRight(d: Direction): Direction = d match {
    case NORTH => EAST
    case EAST => SOUTH
    case SOUTH => WEST
    case WEST => NORTH
    case _ => NONE
  }
  
  implicit class DirectionOps(d: Direction) {
    def turnLeft: Direction = Direction.turnLeft(d)

    def turnRight: Direction = Direction.turnRight(d)
  }
}

DirectionSpec.scala

import org.specs2.mutable.Specification

class DirectionSpec extends Specification {
  "Direction" should {
    "whenGetFromShortNameWThenReturnDirectionW" in {
      val direction = Direction.getFromShortName('W')
      direction === Direction.WEST
    }

    "whenGetFromShortNameBThenReturnNone" in {
      val direction = Direction.getFromShortName('B')
      direction === Direction.NONE
    }

    "givenSWhenLeftThenE" in {
      Direction.SOUTH.turnLeft === Direction.EAST
    }
  }
}