Exercise Bowling Game, test 9, aStrikeEarnsTenPointsInFrameWithASingleRoll tests 19 rolls, which should throw an exception since game is not finished, i.e. should be 20 throws, or 21 if there is an additional ball.
A game in bowling is 10 frames. Frames don’t always have two or more rolls. If you knock down all the pins with your first roll, that ends the frame (unless it’s the last frame).