ok 1 - A Game::Bowling counts that the score is 0, if 0 pins are shot
ok 2 - A Game::Bowling counts that the score is 40, if 2 pins are shot at each roll
ok 3 - A Game::Bowling counts that the score is 41, if 1 more pin is shot at one roll
ok 4 - A Game::Bowling takes into account a spare in the 2nd frame
ok 5 - A Game::Bowling takes into account a spare in the last frame
ok 6 - A Game::Bowling takes into account a strike in the 2nd frame
ok 7 - A Game::Bowling takes into account a strike in the last frame
ok 8 - A Game::Bowling with zero players is not interesting
1..8