bowling_specs.scala

import org.scalatest.Spec
import org.scalatest.matchers.ShouldMatchers

class BowlingGameSpecs extends Spec with ShouldMatchers {
  describe("Playing a game") {
    it("should have a score of zero for a game with all zero rolls") {
      val game = new BowlingGame()
      (1 to 20).map(i => 0).foreach(game.roll)
      game.score should equal(0)
    }

    it("should have a score equal to the number of pins for each roll when there are no strikes") {
      val game = new BowlingGame()
      (1 to 20).map(i => 1).foreach(game.roll)
      game.score should equal(20)
    }

    it("should count the first roll of a frame following a spare twice") {
      val game = new BowlingGame()
      (List(5,5,3) ::: (1 to 17).map(num => 0).toList).foreach(game.roll)
      game.score should equal(16)
    }

    it("should count the entire frame following a strike twice") {
      val game = new BowlingGame()
      (List(10,3,4) ::: (1 to 16).map(num => 0).toList).foreach(game.roll)
      game.score should equal(24)
    }

    it("should score a perfect game as 300") {
      val game = new BowlingGame()
      (1 to 12).map(num => 10).foreach(game.roll)
      game.score should equal(300)
    }

    it("should score a spare on the tenth frame") {
      val game = new BowlingGame()
      ((1 to 19).map(i => 0).toList ::: List(10,5)).foreach(game.roll)
      game.score should equal(15)
    }

    it("should score spares and strikes") {
      val game = new BowlingGame()
      ((1 to 16).map(i => 0).toList ::: List(10,1, 0)).foreach(game.roll)
      game.score should equal(12)
    }
  }
}