A game consists of 10 frames . In each frame the player has​ two opportunities to knock down 10 pins. The score for the frame is the total​ number of pins knocked down, plus bonuses for strikes and spares.​ ​

A spare is when the player knocks down all 10 pins in two tries. The bonus for​ that frame is the number of pins knocked down by the next roll. So in frame 3​ above, the score is 10 (the total number knocked down) plus a bonus of 5 (the​ number of pins knocked down on the next roll.)​ ​

A strike is when the player knocks down all 10 pins on his first try. The bonus​ for that frame is the value of the next two balls rolled.​ ​

In the tenth frame a player who rolls a spare or strike is allowed to roll the extra​ balls to complete the frame. However no more than three balls can be rolled in​ tenth frame.

• The program captures for each roll how many pins went down
• At the end of the game the getScore() method provides the correct score

1. Write a unit test, the test fails
2. Write code to pass the unit test
3. Repeat step 1 and 2 until your program is ready

• Start with the simplest unit test
• On every iteration you add a more complex test
• Step 2 is always a good moment to reflect on your design, refactor if needed (refactoring is safe, you have unit tests :-) )