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  1. require 'test/unit'
  2.  
  3. class WrongNumberOfPlayersError < StandardError ; end 
  4. class NoSuchStrategyError < StandardError ; end 
  5.  
  6. STRATS = ['R','P','S']
  7. PLAYER2_WINS = [['R','P'], ['P','S'],['S','R']]
  8.  
  9. def rps_game_winner(game) 
  10.     raise WrongNumberOfPlayersError unless game.length == 2 
  11.  
  12.     # strategy error checking
  13.     raise NoSuchStrategyError unless game[0].length == 2 && game[1].length == 2
  14.     strat1 = game[0][1].upcase
  15.     strat2 = game[1][1].upcase
  16.     raise NoSuchStrategyError unless STRATS.include?(strat1) && STRATS.include?(strat2)
  17.  
  18.     matchup = [strat1, strat2]
  19.     return PLAYER2_WINS.include?(matchup) ? game[1] : game[0] # player1 wins if 2 doesn't
  20. end 
  21.  
  22.  
  23. class RpsWinner < Test::Unit::TestCase
  24.  
  25.     def test_examples
  26.         expected = ['John', 'P']
  27.         actual = rps_game_winner([['John', 'P'], ['Rick', 'R']])
  28.         assert_equal(expected, actual)
  29.  
  30.         expected = ['John', 'P']
  31.         actual = rps_game_winner([['John', 'P'], ['Rick', 'R']])
  32.         assert_equal(expected, actual)
  33.     end
  34.  
  35.     def test_num_of_players_errors
  36.         assert_raise WrongNumberOfPlayersError do
  37.             rps_game_winner([['John', 'P'], ['Rick', 'R'], ['Rick', 'R']])
  38.         end
  39.         assert_raise WrongNumberOfPlayersError do
  40.             rps_game_winner([['John', 'P']])
  41.         end
  42.         assert_raise WrongNumberOfPlayersError do
  43.             rps_game_winner("Hello")
  44.         end
  45.         assert_raise WrongNumberOfPlayersError do
  46.             rps_game_winner([])
  47.         end
  48.         assert_raise WrongNumberOfPlayersError do
  49.             rps_game_winner([[]])
  50.         end
  51.     end
  52.  
  53.     def test_num_of_players_errors
  54.         assert_raise NoSuchStrategyError do
  55.             rps_game_winner([['John', 'Q'], ['Rick', 'R']])
  56.         end
  57.         assert_raise NoSuchStrategyError do
  58.             rps_game_winner([['John', 'R'], ['Rick', 'X']])
  59.         end
  60.         assert_nothing_raised NoSuchStrategyError do
  61.             rps_game_winner([['John', 'p'], ['Rick', 'r']])
  62.         end
  63.     end
  64. end
  65.  
Success #stdin #stdout 0.03s 5712KB
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Standard input is empty
stdout
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Loaded suite prog
Started
..
Finished in 0.000726 seconds.

2 tests, 5 assertions, 0 failures, 0 errors, 0 skips

Test run options: --seed 27843
https://ideone.com/04Mgc
language:
Ruby (ruby 2.5.5)
created:
12 years ago
visibility:
public

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