feat: 플레이어가 놓은 마지막 돌을 리턴하는 기능 구현

docs/README.md

@@ -13,7 +13,7 @@
  - [x] 플레이어는 흑과 백으로 이루어져 있다.
 - [x] 오목알을 놓은 플레이어가 게임에서 이겼는지 확인한다.
 - [x] 사용자는 특정 위치에 내 돌이 있는지 확인한다.
-- [ ] 사용자는 마지막 돌의 위치를 알고 있다.
+- [x] 사용자는 마지막 돌의 위치를 알고 있다.
 - [ ] 게임의 진행 여부는 `PlayerState`가 결정한다.
 - [x] 오목알을 놓으면 상대방의 차례가 된다.
 

src/main/kotlin/player/Board.kt → src/main/kotlin/Board.kt

@@ -1,8 +1,6 @@
-package player
-
-import BoardState
 import Position.Companion.POSITION_RANGE
-import Stone
+import player.Player
+import player.Players
 
 class Board(private val players: Players) {
  constructor(blackPlayer: Player, whitePlayer: Player) : this(Players(blackPlayer, whitePlayer))

src/main/kotlin/Stones.kt

@@ -1,4 +1,6 @@
 data class Stones(private val stones: List<Stone>) {
+ val lastStone: Stone
+ get() = stones.last().copy()
  constructor(vararg stones: Stone) : this(stones.toList())
 
  init {

src/main/kotlin/player/Turn.kt → src/main/kotlin/Turn.kt

@@ -1,5 +1,3 @@
-package player
-
 enum class Turn {
  BLACK, WHITE;
 

src/main/kotlin/player/Player.kt

@@ -8,7 +8,11 @@ import state.PlayerState
 abstract class Player(protected val state: PlayerState) {
  abstract val boardState: BoardState
 
+ abstract fun putStone(stone: Stone): Player
+
  fun isPlaced(stone: Stone): Boolean = state.hasStone(stone)
+
  fun getPlaced(): List<Position> = state.getPlaced()
- abstract fun putStone(stone: Stone): Player
+
+ fun getLastStone(): Stone = state.getLastStone()
 }

src/main/kotlin/player/Players.kt

@@ -1,6 +1,7 @@
 package player
 
 import Stone
+import Turn
 
 class Players private constructor(private val players: Map<Turn, Player>) {
  constructor(black: Player, white: Player) : this(mapOf(Turn.BLACK to black, Turn.WHITE to white))

src/main/kotlin/state/PlayerState.kt

@@ -10,4 +10,5 @@ abstract class PlayerState(protected val stones: Stones = Stones()) {
  fun hasStone(stone: Stone): Boolean = stones.hasStone(stone)
 
  fun getPlaced(): List<Position> = stones.getPositions()
+ fun getLastStone(): Stone = stones.lastStone
 }

src/test/kotlin/BlackPlayerTest.kt

@@ -20,4 +20,10 @@ class BlackPlayerTest {
 
  assertThat(expected).isFalse
  }
+
+ @Test
+ fun `마지막 놓은 돌을 반환한다`() {
+ val player: Player = BlackPlayer(PlayingState(Stones(ONE_ONE_STONE)))
+ assertThat(player.getLastStone()).isEqualTo(ONE_ONE_STONE)
+ }
 }

src/test/kotlin/BoardTest.kt

@@ -1,9 +1,7 @@
 import org.assertj.core.api.Assertions.assertThat
 import org.junit.jupiter.api.Test
 import player.BlackPlayer
-import player.Board
 import player.Player
-import player.Turn
 import player.WhitePlayer
 import state.PlayingState
 

src/test/kotlin/TurnTest.kt

@@ -1,7 +1,6 @@
 import org.assertj.core.api.Assertions.assertThat
 import org.junit.jupiter.params.ParameterizedTest
 import org.junit.jupiter.params.provider.CsvSource
-import player.Turn
 
 class TurnTest {
  @CsvSource("WHITE, BLACK", "BLACK, WHITE")

src/test/kotlin/WhitePlayerTest.kt

@@ -20,4 +20,10 @@ class WhitePlayerTest {
 
  assertThat(expected).isFalse
  }
+
+ @Test
+ fun `마지막 놓은 돌을 반환한다`() {
+ val player: Player = WhitePlayer(PlayingState(Stones(ONE_ONE_STONE)))
+ assertThat(player.getLastStone()).isEqualTo(ONE_ONE_STONE)
+ }
 }