test 'rafael nadal has the highest score in this game' green automatically..
s/winPoint/addPoint
red: a score can be initialized
green: a score can be initialized
red: there is no winner at the beginning
green: there is no winner at the beginning
red: Rafael Nadal wins the game
green: Rafael Nadal wins the game
red: Pete Sampras wins the game
green: Pete Sampras wins the game