Test Case design

1. Init game --> love all
   • start game status
2. player_one_fifteen --> fifteen love
   • player_one.addScore()
3. player_two_fifteen --> love fifteen
   • player_two.addScore()
4. two_players_fifteen_all --> fifteen all
   • player_one.addScore(), player_two.addScore
5. player_one_thirty --> thirty love
   • player_one.addScore(2)
6. player_two_thirty --> love thirty
   • player_two.addScore(2)
7. player_one_forty --> forty love
   • player_one.addScore(3)
8. player_two_forty --> love forty
   • player_two.addScore(3)
9. two_players_is_deuce --> Deuce
   • player_one.addScore(3), player_two.addScore(3)
10. player_advantage --> ${player_name} adv
    • is_deuce() --> abs(player1.score - player2.score) == 1
11. player_win --> ${player_name} win
    • if not is_deuce() --> player#.score > 4
    • if is_deuce() --> abs(player1.score - player2.score) >= 2