첫 번째 플레이어가 승리합니다! 코드 작성 및 테스트 통과

이제 우리는 테스트에 따라 모듈 게임을 계속 코딩할 것입니다. 그러나 이번에는 첫 번째 플레이어가 이기는 시나리오를 다룹니다.

Game 모듈은 다음과 같습니다.

# lib/game.ex

defmodule Game do
defmodule Game do
  @moduledoc """
  Documentation for `Game`.
  """

  def play(first_player_choice, second_player_choice) do
    result(first_player_choice, second_player_choice)
  end

  defp result(first_player_choice, second_player_choice) do
    cond do
      first_player_choice == second_player_choice -> {:ok, "Draw!"}
    end
  end
end

end

With our tests done, if we run the tests now:

mix test

We'll see the tests failures:

  1) test Game.play/2 when first player wins when first player chooses scissors and second player chooses paper (GameTest)
     test/game_test.exs:38
     ** (CondClauseError) no cond clause evaluated to a truthy value
     code: assert {:ok, match} = Game.play(first_player_choice, second_player_choise)
     stacktrace:
       (rock_paper_scissor_elixir 0.1.0) lib/game.ex:12: Game.result/2
       test/game_test.exs:42: (test)


  2) test Game.play/2 when first player wins when first player chooses stone and second player chooses scissors (GameTest)
     test/game_test.exs:56
     ** (CondClauseError) no cond clause evaluated to a truthy value
     code: assert {:ok, match} = Game.play(first_player_choice, second_player_choise)
     stacktrace:
       (rock_paper_scissor_elixir 0.1.0) lib/game.ex:12: Game.result/2
       test/game_test.exs:60: (test)


  3) test Game.play/2 when first player wins when first player chooses paper and second player chooses stone (GameTest)
     test/game_test.exs:47
     ** (CondClauseError) no cond clause evaluated to a truthy value
     code: assert {:ok, match} = Game.play(first_player_choice, second_player_choise)
     stacktrace:
       (rock_paper_scissor_elixir 0.1.0) lib/game.ex:12: Game.result/2
       test/game_test.exs:51: (test)

..

Finished in 0.03 seconds (0.00s async, 0.03s sync)
6 tests, 3 failures

테스트를 통과하도록 합시다

이제 돌, 종이, 가위에 대한 몇 가지 모듈 속성을 만들어야 합니다.

defmodule Game do
  @moduledoc """
  Documentation for `Game`.
  """

  @stone 1
  @paper 2
  @scissor 3

# ...
end

그런 다음 테스트에 따라 첫 번째 플레이어가 승자임을 보장하는 조건을 추가합니다.

첫 번째 플레이어가 가위를 선택하고 두 번째 플레이어가 종이를 선택할 때

첫 번째 플레이어가 가위를 선택하고 두 번째 플레이어가 종이를 선택할 때 조건을 추가합니다.

defmodule Game do
  @moduledoc """
  Documentation for `Game`.
  """

  def play(first_player_choice, second_player_choice) do
    result(first_player_choice, second_player_choice)
  end

  defp result(first_player_choice, second_player_choice) do
    cond do
      first_player_choice == second_player_choice ->
        {:ok, "Draw!"}

      first_player_choice == @scissor && second_player_choice == @paper ->
        {:ok, "First player win!!!"}
    end
  end
end

이제 테스트를 다시 실행하면 다음과 같습니다.

mix test

실제 시나리오로 테스트를 통과했습니다. 이제 실패한 테스트가 두 번뿐입니다.

Ps.: We have one warning message about the module attributes @stone that was set but never used.

Compiling 1 file (.ex)
warning: module attribute @stone was set but never used
  lib/game.ex:5

...

  1) test Game.play/2 when first player wins when first player chooses stone and second player chooses scissors (GameTest)
     test/game_test.exs:56
     ** (CondClauseError) no cond clause evaluated to a truthy value
     code: assert {:ok, match} = Game.play(first_player_choice, second_player_choise)
     stacktrace:
       (rock_paper_scissor_elixir 0.1.0) lib/game.ex:18: Game.result/2
       test/game_test.exs:60: (test)

.

  2) test Game.play/2 when first player wins when first player chooses paper and second player chooses stone (GameTest)
     test/game_test.exs:47
     ** (CondClauseError) no cond clause evaluated to a truthy value
     code: assert {:ok, match} = Game.play(first_player_choice, second_player_choise)
     stacktrace:
       (rock_paper_scissor_elixir 0.1.0) lib/game.ex:18: Game.result/2
       test/game_test.exs:51: (test)



Finished in 0.03 seconds (0.00s async, 0.03s sync)
6 tests, 2 failures

Randomized with seed 797736
...

Finished in 0.02 seconds (0.00s async, 0.02s sync)
3 tests, 0 failures

Randomized with seed 352470

첫 번째 플레이어가 종이를 선택하고 두 번째 플레이어가 돌을 선택할 때

첫 번째 플레이어가 종이를 선택하고 두 번째 플레이어가 돌을 선택할 때 조건을 추가합니다.

defmodule Game do
  @moduledoc """
  Documentation for `Game`.
  """

  def play(first_player_choice, second_player_choice) do
    result(first_player_choice, second_player_choice)
  end

  defp result(first_player_choice, second_player_choice) do
    cond do
      first_player_choice == second_player_choice ->
        {:ok, "Draw!"}

      first_player_choice == @scissor && second_player_choice == @paper ->
        {:ok, "First player win!!!"}

      first_player_choice == @paper && second_player_choice == @stone ->
        {:ok, "First player win!!!"}
    end
  end
end

이제 테스트를 다시 실행하면 다음과 같습니다.

mix test

실제 시나리오로 테스트를 통과했습니다. 이제 실패한 테스트가 하나뿐입니다.

Compiling 1 file (.ex)
..

  1) test Game.play/2 when first player wins when first player chooses stone and second player chooses scissors (GameTest)
     test/game_test.exs:56
     ** (CondClauseError) no cond clause evaluated to a truthy value
     code: assert {:ok, match} = Game.play(first_player_choice, second_player_choise)
     stacktrace:
       (rock_paper_scissor_elixir 0.1.0) lib/game.ex:21: Game.result/2
       test/game_test.exs:60: (test)

...

Finished in 0.03 seconds (0.00s async, 0.03s sync)
6 tests, 1 failure

Randomized with seed 450094

첫 번째 플레이어가 돌을 선택하고 두 번째 플레이어가 가위를 선택한 경우

첫 번째 플레이어가 돌을 선택하고 두 번째 플레이어가 가위를 선택할 때 조건을 추가합니다.

defmodule Game do
  @moduledoc """
  Documentation for `Game`.
  """

  def play(first_player_choice, second_player_choice) do
    result(first_player_choice, second_player_choice)
  end

  defp result(first_player_choice, second_player_choice) do
    cond do
      first_player_choice == second_player_choice ->
        {:ok, "Draw!"}

      first_player_choice == @scissor && second_player_choice == @paper ->
        {:ok, "First player win!!!"}

      first_player_choice == @paper && second_player_choice == @stone ->
        {:ok, "First player win!!!"}

      first_player_choice == @stone && second_player_choice == @scissor ->
        {:ok, "First player win!!!"}
    end
  end
end

이제 테스트를 다시 실행하면 다음과 같습니다.

mix test

모든 테스트가 성공적으로 통과됩니다.

Compiling 1 file (.ex)
......

Finished in 0.03 seconds (0.00s async, 0.03s sync)
6 tests, 0 failures

Randomized with seed 795123

다음 포스트에서는 두 번째 플레이어가 이겼을 때의 시나리오를 다루는 테스트를 빌드할 것입니다.

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