Bowling Game Kata

Содержание

Слайд 2

Scoring Bowling.

The game consists of 10 frames as shown above. In each

Scoring Bowling. The game consists of 10 frames as shown above. In
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.

Слайд 3

The Requirements.

Write a class named “Game” that has two methods
roll(pins : int)

The Requirements. Write a class named “Game” that has two methods roll(pins
is called each time the player rolls a ball. The argument is the number of pins knocked down.
score() : int is called only at the very end of the game. It returns the total score for that game.

Слайд 4

A quick design session

Clearly we need the Game class.

A quick design session Clearly we need the Game class.

Слайд 5

A quick design session

A game has 10 frames.

A quick design session A game has 10 frames.

Слайд 6

A quick design session

A frame has 1 or two rolls.

A quick design session A frame has 1 or two rolls.

Слайд 7

A quick design session

The tenth frame has two or three rolls.
It is

A quick design session The tenth frame has two or three rolls.
different from all the other frames.

Слайд 8

A quick design session

The score function must
iterate through all the
frames, and calculate
all

A quick design session The score function must iterate through all the
their scores.

Слайд 9

A quick design session

The score for a spare or a strike depends

A quick design session The score for a spare or a strike
on the frame’s successor

Слайд 10

Begin.

Create a project named BowlingGame
Create a unit test named BowlingGameTest
import junit.framework.TestCase;
public class

Begin. Create a project named BowlingGame Create a unit test named BowlingGameTest
BowlingGameTest extends TestCase {
}

Слайд 11

Begin.

Create a project named BowlingGame
Create a unit test named BowlingGameTest
import junit.framework.TestCase;
public class

Begin. Create a project named BowlingGame Create a unit test named BowlingGameTest
BowlingGameTest extends TestCase {
}

Execute this program and verify that you get the following error:
No tests found in BowlingGameTest

Слайд 12

The first test.

import junit.framework.TestCase;
public class BowlingGameTest extends TestCase {
public void testGutterGame()

The first test. import junit.framework.TestCase; public class BowlingGameTest extends TestCase { public
throws Exception {
Game g = new Game();
}
}

Слайд 13

The first test.

import junit.framework.TestCase;
public class BowlingGameTest extends TestCase {
public void testGutterGame()

The first test. import junit.framework.TestCase; public class BowlingGameTest extends TestCase { public
throws Exception {
Game g = new Game();
}
}

public class Game {
}

Слайд 14

The first test.

import junit.framework.TestCase;
public class BowlingGameTest extends TestCase {
public void testGutterGame()

The first test. import junit.framework.TestCase; public class BowlingGameTest extends TestCase { public
throws Exception {
Game g = new Game();
}
}

public class Game {
}

Слайд 15

The first test.

import junit.framework.TestCase;
public class BowlingGameTest extends TestCase {
public void testGutterGame()

The first test. import junit.framework.TestCase; public class BowlingGameTest extends TestCase { public
throws Exception {
Game g = new Game();
for (int i=0; i<20; i++)
g.roll(0);
}
}

public class Game {
}

Слайд 16

The first test.

import junit.framework.TestCase;
public class BowlingGameTest extends TestCase {
public void testGutterGame()

The first test. import junit.framework.TestCase; public class BowlingGameTest extends TestCase { public
throws Exception {
Game g = new Game();
for (int i=0; i<20; i++)
g.roll(0);
}
}

public class Game {
public void roll(int pins) {
}
}

Слайд 17

The first test.

import junit.framework.TestCase;
public class BowlingGameTest extends TestCase {
public void testGutterGame()

The first test. import junit.framework.TestCase; public class BowlingGameTest extends TestCase { public
throws Exception {
Game g = new Game();
for (int i=0; i<20; i++)
g.roll(0);
assertEquals(0, g.score());
}
}

public class Game {
public void roll(int pins) {
}
}

Слайд 18

The first test.

import junit.framework.TestCase;
public class BowlingGameTest extends TestCase {
public void testGutterGame()

The first test. import junit.framework.TestCase; public class BowlingGameTest extends TestCase { public
throws Exception {
Game g = new Game();
for (int i=0; i<20; i++)
g.roll(0);
assertEquals(0, g.score());
}
}

public class Game {
public void roll(int pins) {
}
public int score() {
return -1;
}
}

expected:<0> but was:<-1>

Слайд 19

The first test.

import junit.framework.TestCase;
public class BowlingGameTest extends TestCase {
public void testGutterGame()

The first test. import junit.framework.TestCase; public class BowlingGameTest extends TestCase { public
throws Exception {
Game g = new Game();
for (int i=0; i<20; i++)
g.roll(0);
assertEquals(0, g.score());
}
}

public class Game {
public void roll(int pins) {
}
public int score() {
return 0;
}
}

Слайд 20

The Second test.

import junit.framework.TestCase;
public class BowlingGameTest extends TestCase {
public void testGutterGame()

The Second test. import junit.framework.TestCase; public class BowlingGameTest extends TestCase { public
throws Exception {
Game g = new Game();
for (int i = 0; i < 20; i++)
g.roll(0);
assertEquals(0, g.score());
}
public void testAllOnes() throws Exception {
Game g = new Game();
for (int i = 0; i < 20; i++)
g.roll(1);
assertEquals(20, g.score());
}
}

public class Game {
public void roll(int pins) {
}
public int score() {
return 0;
}
}

Слайд 21

The Second test.

import junit.framework.TestCase;
public class BowlingGameTest extends TestCase {
public void testGutterGame()

The Second test. import junit.framework.TestCase; public class BowlingGameTest extends TestCase { public
throws Exception {
Game g = new Game();
for (int i = 0; i < 20; i++)
g.roll(0);
assertEquals(0, g.score());
}
public void testAllOnes() throws Exception {
Game g = new Game();
for (int i = 0; i < 20; i++)
g.roll(1);
assertEquals(20, g.score());
}
}

public class Game {
public void roll(int pins) {
}
public int score() {
return 0;
}
}

- Game creation is duplicated
- roll loop is duplicated

Слайд 22

The Second test.

import junit.framework.TestCase;
public class BowlingGameTest extends TestCase {
public void testGutterGame()

The Second test. import junit.framework.TestCase; public class BowlingGameTest extends TestCase { public
throws Exception {
Game g = new Game();
for (int i = 0; i < 20; i++)
g.roll(0);
assertEquals(0, g.score());
}
public void testAllOnes() throws Exception {
Game g = new Game();
for (int i = 0; i < 20; i++)
g.roll(1);
assertEquals(20, g.score());
}
}

public class Game {
public void roll(int pins) {
}
public int score() {
return 0;
}
}

- Game creation is duplicated
- roll loop is duplicated

expected:<20> but was:<0>

Слайд 23

The Second test.

import junit.framework.TestCase;
public class BowlingGameTest extends TestCase {
private Game g;

The Second test. import junit.framework.TestCase; public class BowlingGameTest extends TestCase { private
protected void setUp() throws Exception {
g = new Game();
}
public void testGutterGame() throws Exception {
for (int i = 0; i < 20; i++)
g.roll(0);
assertEquals(0, g.score());
}
public void testAllOnes() throws Exception {
for (int i = 0; i < 20; i++)
g.roll(1);
assertEquals(20, g.score());
}
}

public class Game {
private int score = 0;
public void roll(int pins) {
score += pins;
}
public int score() {
return score;
}
}

- roll loop is duplicated

Слайд 24

The Second test.

import junit.framework.TestCase;
public class BowlingGameTest extends TestCase {
private Game g;

The Second test. import junit.framework.TestCase; public class BowlingGameTest extends TestCase { private
protected void setUp() throws Exception {
g = new Game();
}
public void testGutterGame() throws Exception {
int n = 20;
int pins = 0;
for (int i = 0; i < n; i++) {
g.roll(pins);
}
assertEquals(0, g.score());
}
public void testAllOnes() throws Exception {
for (int i = 0; i < 20; i++)
g.roll(1);
assertEquals(20, g.score());
}
}

public class Game {
private int score = 0;
public void roll(int pins) {
score += pins;
}
public int score() {
return score;
}
}

- roll loop is duplicated

Слайд 25

The Second test.

import junit.framework.TestCase;
public class BowlingGameTest extends TestCase {
private Game g;

The Second test. import junit.framework.TestCase; public class BowlingGameTest extends TestCase { private
protected void setUp() throws Exception {
g = new Game();
}
public void testGutterGame() throws Exception {
int n = 20;
int pins = 0;
rollMany(n, pins);
assertEquals(0, g.score());
}
private void rollMany(int n, int pins) {
for (int i = 0; i < n; i++)
g.roll(pins);
}
public void testAllOnes() throws Exception {
for (int i = 0; i < 20; i++)
g.roll(1);
assertEquals(20, g.score());
}
}

public class Game {
private int score = 0;
public void roll(int pins) {
score += pins;
}
public int score() {
return score;
}
}

- roll loop is duplicated

Слайд 26

The Second test.

import junit.framework.TestCase;
public class BowlingGameTest extends TestCase {
private Game g;

The Second test. import junit.framework.TestCase; public class BowlingGameTest extends TestCase { private
protected void setUp() throws Exception {
g = new Game();
}
public void testGutterGame() throws Exception {
rollMany(20, 0);
assertEquals(0, g.score());
}
private void rollMany(int n, int pins) {
for (int i = 0; i < n; i++)
g.roll(pins);
}
public void testAllOnes() throws Exception {
for (int i = 0; i < 20; i++)
g.roll(1);
assertEquals(20, g.score());
}
}

public class Game {
private int score = 0;
public void roll(int pins) {
score += pins;
}
public int score() {
return score;
}
}

- roll loop is duplicated

Слайд 27

The Second test.

import junit.framework.TestCase;
public class BowlingGameTest extends TestCase {
private Game g;

The Second test. import junit.framework.TestCase; public class BowlingGameTest extends TestCase { private
protected void setUp() throws Exception {
g = new Game();
}
public void testGutterGame() throws Exception {
rollMany(20, 0);
assertEquals(0, g.score());
}
private void rollMany(int n, int pins) {
for (int i = 0; i < n; i++)
g.roll(pins);
}
public void testAllOnes() throws Exception {
rollMany(20,1);
assertEquals(20, g.score());
}
}

public class Game {
private int score = 0;
public void roll(int pins) {
score += pins;
}
public int score() {
return score;
}
}

- roll loop is duplicated

Слайд 28

The Second test.

import junit.framework.TestCase;
public class BowlingGameTest extends TestCase {
private Game g;

The Second test. import junit.framework.TestCase; public class BowlingGameTest extends TestCase { private
protected void setUp() throws Exception {
g = new Game();
}
private void rollMany(int n, int pins) {
for (int i = 0; i < n; i++)
g.roll(pins);
}
public void testGutterGame() throws Exception {
rollMany(20, 0);
assertEquals(0, g.score());
}
public void testAllOnes() throws Exception {
rollMany(20,1);
assertEquals(20, g.score());
}
}

public class Game {
private int score = 0;
public void roll(int pins) {
score += pins;
}
public int score() {
return score;
}
}

Слайд 29

The Third test.

import junit.framework.TestCase;
public class BowlingGameTest extends TestCase {
private Game g;

The Third test. import junit.framework.TestCase; public class BowlingGameTest extends TestCase { private
protected void setUp() throws Exception {
g = new Game();
}
private void rollMany(int n, int pins) {
for (int i = 0; i < n; i++)
g.roll(pins);
}
public void testGutterGame() throws Exception {
rollMany(20, 0);
assertEquals(0, g.score());
}
public void testAllOnes() throws Exception {
rollMany(20,1);
assertEquals(20, g.score());
}
public void testOneSpare() throws Exception {
g.roll(5);
g.roll(5); // spare
g.roll(3);
rollMany(17,0);
assertEquals(16,g.score());
}
}

public class Game {
private int score = 0;
public void roll(int pins) {
score += pins;
}
public int score() {
return score;
}
}

- ugly comment in test.

Слайд 30

The Third test.

import junit.framework.TestCase;
public class BowlingGameTest extends TestCase {
private Game g;

The Third test. import junit.framework.TestCase; public class BowlingGameTest extends TestCase { private
protected void setUp() throws Exception {
g = new Game();
}
private void rollMany(int n, int pins) {
for (int i = 0; i < n; i++)
g.roll(pins);
}
public void testGutterGame() throws Exception {
rollMany(20, 0);
assertEquals(0, g.score());
}
public void testAllOnes() throws Exception {
rollMany(20,1);
assertEquals(20, g.score());
}
public void testOneSpare() throws Exception {
g.roll(5);
g.roll(5); // spare
g.roll(3);
rollMany(17,0);
assertEquals(16,g.score());
}
}

public class Game {
private int score = 0;
public void roll(int pins) {
score += pins;
}
public int score() {
return score;
}
}

- ugly comment in test.

expected:<16> but was:<13>

Слайд 31

The Third test.

import junit.framework.TestCase;
public class BowlingGameTest extends TestCase {
private Game g;

The Third test. import junit.framework.TestCase; public class BowlingGameTest extends TestCase { private
protected void setUp() throws Exception {
g = new Game();
}
private void rollMany(int n, int pins) {
for (int i = 0; i < n; i++)
g.roll(pins);
}
public void testGutterGame() throws Exception {
rollMany(20, 0);
assertEquals(0, g.score());
}
public void testAllOnes() throws Exception {
rollMany(20,1);
assertEquals(20, g.score());
}
public void testOneSpare() throws Exception {
g.roll(5);
g.roll(5); // spare
g.roll(3);
rollMany(17,0);
assertEquals(16,g.score());
}
}

public class Game {
private int score = 0;
public void roll(int pins) {
score += pins;
}
public int score() {
return score;
}
}

- ugly comment in test.

tempted to use flag to remember previous roll. So design must be wrong.

Слайд 32

The Third test.

import junit.framework.TestCase;
public class BowlingGameTest extends TestCase {
private Game g;

The Third test. import junit.framework.TestCase; public class BowlingGameTest extends TestCase { private
protected void setUp() throws Exception {
g = new Game();
}
private void rollMany(int n, int pins) {
for (int i = 0; i < n; i++)
g.roll(pins);
}
public void testGutterGame() throws Exception {
rollMany(20, 0);
assertEquals(0, g.score());
}
public void testAllOnes() throws Exception {
rollMany(20,1);
assertEquals(20, g.score());
}
public void testOneSpare() throws Exception {
g.roll(5);
g.roll(5); // spare
g.roll(3);
rollMany(17,0);
assertEquals(16,g.score());
}
}

public class Game {
private int score = 0;
public void roll(int pins) {
score += pins;
}
public int score() {
return score;
}
}

- ugly comment in test.

roll() calculates score, but name does not imply that.

score() does not calculate score, but name implies that it does.

Design is wrong. Responsibilities are misplaced.

Слайд 33

The Third test.

import junit.framework.TestCase;
public class BowlingGameTest extends TestCase {
private Game g;

The Third test. import junit.framework.TestCase; public class BowlingGameTest extends TestCase { private
protected void setUp() throws Exception {
g = new Game();
}
private void rollMany(int n, int pins) {
for (int i = 0; i < n; i++)
g.roll(pins);
}
public void testGutterGame() throws Exception {
rollMany(20, 0);
assertEquals(0, g.score());
}
public void testAllOnes() throws Exception {
rollMany(20,1);
assertEquals(20, g.score());
}
// public void testOneSpare() throws Exception {
// g.roll(5);
// g.roll(5); // spare
// g.roll(3);
// rollMany(17,0);
// assertEquals(16,g.score());
// }
}

public class Game {
private int score = 0;
public void roll(int pins) {
score += pins;
}
public int score() {
return score;
}
}

- ugly comment in test.

Слайд 34

The Third test.

import junit.framework.TestCase;
public class BowlingGameTest extends TestCase {
private Game g;

The Third test. import junit.framework.TestCase; public class BowlingGameTest extends TestCase { private
protected void setUp() throws Exception {
g = new Game();
}
private void rollMany(int n, int pins) {
for (int i = 0; i < n; i++)
g.roll(pins);
}
public void testGutterGame() throws Exception {
rollMany(20, 0);
assertEquals(0, g.score());
}
public void testAllOnes() throws Exception {
rollMany(20,1);
assertEquals(20, g.score());
}
// public void testOneSpare() throws Exception {
// g.roll(5);
// g.roll(5); // spare
// g.roll(3);
// rollMany(17,0);
// assertEquals(16,g.score());
// }
}

public class Game {
private int score = 0;
private int rolls[] = new int[21];
private int currentRoll = 0;
public void roll(int pins) {
score += pins;
rolls[currentRoll++] = pins;
}
public int score() {
return score;
}
}

- ugly comment in test.

Слайд 35

The Third test.

import junit.framework.TestCase;
public class BowlingGameTest extends TestCase {
private Game g;

The Third test. import junit.framework.TestCase; public class BowlingGameTest extends TestCase { private
protected void setUp() throws Exception {
g = new Game();
}
private void rollMany(int n, int pins) {
for (int i = 0; i < n; i++)
g.roll(pins);
}
public void testGutterGame() throws Exception {
rollMany(20, 0);
assertEquals(0, g.score());
}
public void testAllOnes() throws Exception {
rollMany(20,1);
assertEquals(20, g.score());
}
// public void testOneSpare() throws Exception {
// g.roll(5);
// g.roll(5); // spare
// g.roll(3);
// rollMany(17,0);
// assertEquals(16,g.score());
// }
}

public class Game {
private int score = 0;
private int rolls[] = new int[21];
private int currentRoll = 0;
public void roll(int pins) {
score += pins;
rolls[currentRoll++] = pins;
}
public int score() {
int score = 0;
for (int i = 0; i < rolls.length; i++)
score += rolls[i];
return score;
}
}

- ugly comment in test.

Слайд 36

The Third test.

import junit.framework.TestCase;
public class BowlingGameTest extends TestCase {
private Game g;

The Third test. import junit.framework.TestCase; public class BowlingGameTest extends TestCase { private
protected void setUp() throws Exception {
g = new Game();
}
private void rollMany(int n, int pins) {
for (int i = 0; i < n; i++)
g.roll(pins);
}
public void testGutterGame() throws Exception {
rollMany(20, 0);
assertEquals(0, g.score());
}
public void testAllOnes() throws Exception {
rollMany(20,1);
assertEquals(20, g.score());
}
// public void testOneSpare() throws Exception {
// g.roll(5);
// g.roll(5); // spare
// g.roll(3);
// rollMany(17,0);
// assertEquals(16,g.score());
// }
}

public class Game {
private int rolls[] = new int[21];
private int currentRoll = 0;
public void roll(int pins) {
rolls[currentRoll++] = pins;
}
public int score() {
int score = 0;
for (int i = 0; i < rolls.length; i++)
score += rolls[i];
return score;
}
}

- ugly comment in test.

Слайд 37

The Third test.

import junit.framework.TestCase;
public class BowlingGameTest extends TestCase {
private Game g;

The Third test. import junit.framework.TestCase; public class BowlingGameTest extends TestCase { private
protected void setUp() throws Exception {
g = new Game();
}
private void rollMany(int n, int pins) {
for (int i = 0; i < n; i++)
g.roll(pins);
}
public void testGutterGame() throws Exception {
rollMany(20, 0);
assertEquals(0, g.score());
}
public void testAllOnes() throws Exception {
rollMany(20,1);
assertEquals(20, g.score());
}
public void testOneSpare() throws Exception {
g.roll(5);
g.roll(5); // spare
g.roll(3);
rollMany(17,0);
assertEquals(16,g.score());
}
}

public class Game {
private int rolls[] = new int[21];
private int currentRoll = 0;
public void roll(int pins) {
rolls[currentRoll++] = pins;
}
public int score() {
int score = 0;
for (int i = 0; i < rolls.length; i++)
score += rolls[i];
return score;
}
}

- ugly comment in test.

expected:<16> but was:<13>

Слайд 38

The Third test.

import junit.framework.TestCase;
public class BowlingGameTest extends TestCase {
private Game g;

The Third test. import junit.framework.TestCase; public class BowlingGameTest extends TestCase { private
protected void setUp() throws Exception {
g = new Game();
}
private void rollMany(int n, int pins) {
for (int i = 0; i < n; i++)
g.roll(pins);
}
public void testGutterGame() throws Exception {
rollMany(20, 0);
assertEquals(0, g.score());
}
public void testAllOnes() throws Exception {
rollMany(20,1);
assertEquals(20, g.score());
}
public void testOneSpare() throws Exception {
g.roll(5);
g.roll(5); // spare
g.roll(3);
rollMany(17,0);
assertEquals(16,g.score());
}
}

public class Game {
private int rolls[] = new int[21];
private int currentRoll = 0;
public void roll(int pins) {
rolls[currentRoll++] = pins;
}
public int score() {
int score = 0;
for (int i = 0; i < rolls.length; i++) {
if (rolls[i] + rolls[i+1] == 10) // spare
score += ...
score += rolls[i];
}
return score;
}
}

- ugly comment in test.

This isn’t going to work because i might not refer to the first ball of the frame.
Design is still wrong.
Need to walk through array two balls (one frame) at a time.

Слайд 39

The Third test.

import junit.framework.TestCase;
public class BowlingGameTest extends TestCase {
private Game g;

The Third test. import junit.framework.TestCase; public class BowlingGameTest extends TestCase { private
protected void setUp() throws Exception {
g = new Game();
}
private void rollMany(int n, int pins) {
for (int i = 0; i < n; i++)
g.roll(pins);
}
public void testGutterGame() throws Exception {
rollMany(20, 0);
assertEquals(0, g.score());
}
public void testAllOnes() throws Exception {
rollMany(20,1);
assertEquals(20, g.score());
}
// public void testOneSpare() throws Exception {
// g.roll(5);
// g.roll(5); // spare
// g.roll(3);
// rollMany(17,0);
// assertEquals(16,g.score());
// }
}

public class Game {
private int rolls[] = new int[21];
private int currentRoll = 0;
public void roll(int pins) {
rolls[currentRoll++] = pins;
}
public int score() {
int score = 0;
for (int i = 0; i < rolls.length; i++)
score += rolls[i];
return score;
}
}

- ugly comment in test.

Слайд 40

The Third test.

import junit.framework.TestCase;
public class BowlingGameTest extends TestCase {
private Game g;

The Third test. import junit.framework.TestCase; public class BowlingGameTest extends TestCase { private
protected void setUp() throws Exception {
g = new Game();
}
private void rollMany(int n, int pins) {
for (int i = 0; i < n; i++)
g.roll(pins);
}
public void testGutterGame() throws Exception {
rollMany(20, 0);
assertEquals(0, g.score());
}
public void testAllOnes() throws Exception {
rollMany(20,1);
assertEquals(20, g.score());
}
// public void testOneSpare() throws Exception {
// g.roll(5);
// g.roll(5); // spare
// g.roll(3);
// rollMany(17,0);
// assertEquals(16,g.score());
// }
}

public class Game {
private int rolls[] = new int[21];
private int currentRoll = 0;
public void roll(int pins) {
rolls[currentRoll++] = pins;
}
public int score() {
int score = 0;
int i = 0;
for (int frame = 0; frame < 10; frame++) {
score += rolls[i] + rolls[i+1];
i += 2;
}
return score;
}
}

- ugly comment in test.

Слайд 41

The Third test.

import junit.framework.TestCase;
public class BowlingGameTest extends TestCase {
private Game g;

The Third test. import junit.framework.TestCase; public class BowlingGameTest extends TestCase { private
protected void setUp() throws Exception {
g = new Game();
}
private void rollMany(int n, int pins) {
for (int i = 0; i < n; i++)
g.roll(pins);
}
public void testGutterGame() throws Exception {
rollMany(20, 0);
assertEquals(0, g.score());
}
public void testAllOnes() throws Exception {
rollMany(20,1);
assertEquals(20, g.score());
}
public void testOneSpare() throws Exception {
g.roll(5);
g.roll(5); // spare
g.roll(3);
rollMany(17,0);
assertEquals(16,g.score());
}
}

public class Game {
private int rolls[] = new int[21];
private int currentRoll = 0;
public void roll(int pins) {
rolls[currentRoll++] = pins;
}
public int score() {
int score = 0;
int i = 0;
for (int frame = 0; frame < 10; frame++) {
score += rolls[i] + rolls[i+1];
i += 2;
}
return score;
}
}

- ugly comment in test.

expected:<16> but was:<13>

Слайд 42

The Third test.

import junit.framework.TestCase;
public class BowlingGameTest extends TestCase {
private Game g;

The Third test. import junit.framework.TestCase; public class BowlingGameTest extends TestCase { private
protected void setUp() throws Exception {
g = new Game();
}
private void rollMany(int n, int pins) {
for (int i = 0; i < n; i++)
g.roll(pins);
}
public void testGutterGame() throws Exception {
rollMany(20, 0);
assertEquals(0, g.score());
}
public void testAllOnes() throws Exception {
rollMany(20,1);
assertEquals(20, g.score());
}
public void testOneSpare() throws Exception {
g.roll(5);
g.roll(5); // spare
g.roll(3);
rollMany(17,0);
assertEquals(16,g.score());
}
}

public class Game {
private int rolls[] = new int[21];
private int currentRoll = 0;
public void roll(int pins) {
rolls[currentRoll++] = pins;
}
public int score() {
int score = 0;
int i = 0;
for (int frame = 0; frame < 10; frame++) {
if (rolls[i] + rolls[i + 1] == 10) // spare
{
score += 10 + rolls[i + 2];
i += 2;
} else {
score += rolls[i] + rolls[i + 1];
i += 2;
}
}
return score;
}
}

- ugly comment in test.

Слайд 43

The Third test.

import junit.framework.TestCase;
public class BowlingGameTest extends TestCase {
private Game g;

The Third test. import junit.framework.TestCase; public class BowlingGameTest extends TestCase { private
protected void setUp() throws Exception {
g = new Game();
}
private void rollMany(int n, int pins) {
for (int i = 0; i < n; i++)
g.roll(pins);
}
public void testGutterGame() throws Exception {
rollMany(20, 0);
assertEquals(0, g.score());
}
public void testAllOnes() throws Exception {
rollMany(20,1);
assertEquals(20, g.score());
}
public void testOneSpare() throws Exception {
g.roll(5);
g.roll(5); // spare
g.roll(3);
rollMany(17,0);
assertEquals(16,g.score());
}
}

public class Game {
private int rolls[] = new int[21];
private int currentRoll = 0;
public void roll(int pins) {
rolls[currentRoll++] = pins;
}
public int score() {
int score = 0;
int i = 0;
for (int frame = 0; frame < 10; frame++) {
if (rolls[i] + rolls[i + 1] == 10) // spare
{
score += 10 + rolls[i + 2];
i += 2;
} else {
score += rolls[i] + rolls[i + 1];
i += 2;
}
}
return score;
}
}

ugly comment in test.
ugly comment in conditional.
i is a bad name for this variable

Слайд 44

The Third test.

import junit.framework.TestCase;
public class BowlingGameTest extends TestCase {
private Game g;

The Third test. import junit.framework.TestCase; public class BowlingGameTest extends TestCase { private
protected void setUp() throws Exception {
g = new Game();
}
private void rollMany(int n, int pins) {
for (int i = 0; i < n; i++)
g.roll(pins);
}
public void testGutterGame() throws Exception {
rollMany(20, 0);
assertEquals(0, g.score());
}
public void testAllOnes() throws Exception {
rollMany(20,1);
assertEquals(20, g.score());
}
public void testOneSpare() throws Exception {
g.roll(5);
g.roll(5); // spare
g.roll(3);
rollMany(17,0);
assertEquals(16,g.score());
}
}

public class Game {
private int rolls[] = new int[21];
private int currentRoll = 0;
public void roll(int pins) {
rolls[currentRoll++] = pins;
}
public int score() {
int score = 0;
int frameIndex = 0;
for (int frame = 0; frame < 10; frame++) {
if (rolls[frameIndex] +
rolls[frameIndex + 1] == 10) // spare
{
score += 10 + rolls[frameIndex + 2];
frameIndex += 2;
} else {
score += rolls[frameIndex] +
rolls[frameIndex + 1];
frameIndex += 2;
}
}
return score;
}
}

ugly comment in test.
ugly comment in conditional.

Слайд 45

The Third test.

import junit.framework.TestCase;
public class BowlingGameTest extends TestCase {
private Game g;

The Third test. import junit.framework.TestCase; public class BowlingGameTest extends TestCase { private
protected void setUp() throws Exception {
g = new Game();
}
private void rollMany(int n, int pins) {
for (int i = 0; i < n; i++)
g.roll(pins);
}
public void testGutterGame() throws Exception {
rollMany(20, 0);
assertEquals(0, g.score());
}
public void testAllOnes() throws Exception {
rollMany(20,1);
assertEquals(20, g.score());
}
public void testOneSpare() throws Exception {
g.roll(5);
g.roll(5); // spare
g.roll(3);
rollMany(17,0);
assertEquals(16,g.score());
}
}

public class Game {
private int rolls[] = new int[21];
private int currentRoll = 0;
public void roll(int pins) {
rolls[currentRoll++] = pins;
}
public int score() {
int score = 0;
int frameIndex = 0;
for (int frame = 0; frame < 10; frame++) {
if (isSpare(frameIndex))
{
score += 10 + rolls[frameIndex + 2];
frameIndex += 2;
} else {
score += rolls[frameIndex] +
rolls[frameIndex + 1];
frameIndex += 2;
}
}
return score;
}
private boolean isSpare(int frameIndex) {
return rolls[frameIndex] +
rolls[frameIndex + 1] == 10;
}
}

ugly comment in test.

Слайд 46

The Third test.

import junit.framework.TestCase;
public class BowlingGameTest extends TestCase {
private Game g;

The Third test. import junit.framework.TestCase; public class BowlingGameTest extends TestCase { private
protected void setUp() throws Exception {
g = new Game();
}
private void rollMany(int n, int pins) {
for (int i = 0; i < n; i++)
g.roll(pins);
}
public void testGutterGame() throws Exception {
rollMany(20, 0);
assertEquals(0, g.score());
}
public void testAllOnes() throws Exception {
rollMany(20,1);
assertEquals(20, g.score());
}
public void testOneSpare() throws Exception {
rollSpare();
g.roll(3);
rollMany(17,0);
assertEquals(16,g.score());
}
private void rollSpare() {
g.roll(5);
g.roll(5);
}
}

public class Game {
private int rolls[] = new int[21];
private int currentRoll = 0;
public void roll(int pins) {
rolls[currentRoll++] = pins;
}
public int score() {
int score = 0;
int frameIndex = 0;
for (int frame = 0; frame < 10; frame++) {
if (isSpare(frameIndex))
{
score += 10 + rolls[frameIndex + 2];
frameIndex += 2;
} else {
score += rolls[frameIndex] +
rolls[frameIndex + 1];
frameIndex += 2;
}
}
return score;
}
private boolean isSpare(int frameIndex) {
return rolls[frameIndex] +
rolls[frameIndex + 1] == 10;
}
}

-

Слайд 47

The Fourth test.

import junit.framework.TestCase;
public class BowlingGameTest extends TestCase {
...
public void

The Fourth test. import junit.framework.TestCase; public class BowlingGameTest extends TestCase { ...
testGutterGame() throws Exception {
rollMany(20, 0);
assertEquals(0, g.score());
}
public void testAllOnes() throws Exception {
rollMany(20,1);
assertEquals(20, g.score());
}
public void testOneSpare() throws Exception {
rollSpare();
g.roll(3);
rollMany(17,0);
assertEquals(16,g.score());
}
public void testOneStrike() throws Exception {
g.roll(10); // strike
g.roll(3);
g.roll(4);
rollMany(16, 0);
assertEquals(24, g.score());
}
private void rollSpare() {
g.roll(5);
g.roll(5);
}
}

public class Game {
private int rolls[] = new int[21];
private int currentRoll = 0;
public void roll(int pins) {
rolls[currentRoll++] = pins;
}
public int score() {
int score = 0;
int frameIndex = 0;
for (int frame = 0; frame < 10; frame++) {
if (isSpare(frameIndex))
{
score += 10 + rolls[frameIndex + 2];
frameIndex += 2;
} else {
score += rolls[frameIndex] +
rolls[frameIndex + 1];
frameIndex += 2;
}
}
return score;
}
private boolean isSpare(int frameIndex) {
return rolls[frameIndex] +
rolls[frameIndex + 1] == 10;
}
}

- ugly comment in testOneStrike.

expected:<24> but was:<17>

Слайд 48

The Fourth test.

import junit.framework.TestCase;
public class BowlingGameTest extends TestCase {
...
public void

The Fourth test. import junit.framework.TestCase; public class BowlingGameTest extends TestCase { ...
testGutterGame() throws Exception {
rollMany(20, 0);
assertEquals(0, g.score());
}
public void testAllOnes() throws Exception {
rollMany(20,1);
assertEquals(20, g.score());
}
public void testOneSpare() throws Exception {
rollSpare();
g.roll(3);
rollMany(17,0);
assertEquals(16,g.score());
}
public void testOneStrike() throws Exception {
g.roll(10); // strike
g.roll(3);
g.roll(4);
rollMany(16, 0);
assertEquals(24, g.score());
}
private void rollSpare() {
g.roll(5);
g.roll(5);
}
}

public class Game {
private int rolls[] = new int[21];
private int currentRoll = 0;
public void roll(int pins) {
rolls[currentRoll++] = pins;
}
public int score() {
int score = 0;
int frameIndex = 0;
for (int frame = 0; frame < 10; frame++) {
if (rolls[frameIndex] == 10) // strike
{
score += 10 +
rolls[frameIndex+1] +
rolls[frameIndex+2];
frameIndex++;
}
else if (isSpare(frameIndex))
{
score += 10 + rolls[frameIndex + 2];
frameIndex += 2;
} else {
score += rolls[frameIndex] +
rolls[frameIndex + 1];
frameIndex += 2;
}
}
return score;
}
private boolean isSpare(int frameIndex) {
return rolls[frameIndex] +
rolls[frameIndex + 1] == 10;
}
}

ugly comment in testOneStrike.
ugly comment in conditional.
ugly expressions.

Слайд 49

The Fourth test.

import junit.framework.TestCase;
public class BowlingGameTest extends TestCase {
...
public void

The Fourth test. import junit.framework.TestCase; public class BowlingGameTest extends TestCase { ...
testGutterGame() throws Exception {
rollMany(20, 0);
assertEquals(0, g.score());
}
public void testAllOnes() throws Exception {
rollMany(20,1);
assertEquals(20, g.score());
}
public void testOneSpare() throws Exception {
rollSpare();
g.roll(3);
rollMany(17,0);
assertEquals(16,g.score());
}
public void testOneStrike() throws Exception {
g.roll(10); // strike
g.roll(3);
g.roll(4);
rollMany(16, 0);
assertEquals(24, g.score());
}
private void rollSpare() {
g.roll(5);
g.roll(5);
}
}

public class Game {
private int rolls[] = new int[21];
private int currentRoll = 0;
public void roll(int pins) {
rolls[currentRoll++] = pins;
}
public int score() {
int score = 0;
int frameIndex = 0;
for (int frame = 0; frame < 10; frame++) {
if (rolls[frameIndex] == 10) // strike
{
score += 10 + strikeBonus(frameIndex);
frameIndex++;
} else if (isSpare(frameIndex)) {
score += 10 + spareBonus(frameIndex);
frameIndex += 2;
} else {
score += sumOfBallsInFrame(frameIndex);
frameIndex += 2;
}
}
return score;
}
private int sumOfBallsInFrame(int frameIndex) {
return rolls[frameIndex]+rolls[frameIndex+1];
}
private int spareBonus(int frameIndex) {
return rolls[frameIndex + 2];
}
private int strikeBonus(int frameIndex) {
return rolls[frameIndex+1]+rolls[frameIndex+2];
}
private boolean isSpare(int frameIndex) {
return rolls[frameIndex]+rolls[frameIndex+1] == 10;
}
}

ugly comment in testOneStrike.
ugly comment in conditional.

Слайд 50

The Fourth test.

import junit.framework.TestCase;
public class BowlingGameTest extends TestCase {
...
public void

The Fourth test. import junit.framework.TestCase; public class BowlingGameTest extends TestCase { ...
testGutterGame() throws Exception {
rollMany(20, 0);
assertEquals(0, g.score());
}
public void testAllOnes() throws Exception {
rollMany(20,1);
assertEquals(20, g.score());
}
public void testOneSpare() throws Exception {
rollSpare();
g.roll(3);
rollMany(17,0);
assertEquals(16,g.score());
}
public void testOneStrike() throws Exception {
g.roll(10); // strike
g.roll(3);
g.roll(4);
rollMany(16, 0);
assertEquals(24, g.score());
}
private void rollSpare() {
g.roll(5);
g.roll(5);
}
}

public class Game {
private int rolls[] = new int[21];
private int currentRoll = 0;
public void roll(int pins) {
rolls[currentRoll++] = pins;
}
public int score() {
int score = 0;
int frameIndex = 0;
for (int frame = 0; frame < 10; frame++) {
if (isStrike(frameIndex)) {
score += 10 + strikeBonus(frameIndex);
frameIndex++;
} else if (isSpare(frameIndex)) {
score += 10 + spareBonus(frameIndex);
frameIndex += 2;
} else {
score += sumOfBallsInFrame(frameIndex);
frameIndex += 2;
}
}
return score;
}
private boolean isStrike(int frameIndex) {
return rolls[frameIndex] == 10;
}
private int sumOfBallsInFrame(int frameIndex) {
return rolls[frameIndex] + rolls[frameIndex+1];
}
private int spareBonus(int frameIndex) {
return rolls[frameIndex+2];
}
private int strikeBonus(int frameIndex) {
return rolls[frameIndex+1] + rolls[frameIndex+2];
}
private boolean isSpare(int frameIndex) {
return rolls[frameIndex]+rolls[frameIndex+1] == 10;
}
}

ugly comment in testOneStrike.

Слайд 51

The Fourth test.

...
public void testGutterGame() throws Exception {
rollMany(20, 0);

The Fourth test. ... public void testGutterGame() throws Exception { rollMany(20, 0);
assertEquals(0, g.score());
}
public void testAllOnes() throws Exception {
rollMany(20,1);
assertEquals(20, g.score());
}
public void testOneSpare() throws Exception {
rollSpare();
g.roll(3);
rollMany(17,0);
assertEquals(16,g.score());
}
public void testOneStrike() throws Exception {
rollStrike();
g.roll(3);
g.roll(4);
rollMany(16, 0);
assertEquals(24, g.score());
}
private void rollStrike() {
g.roll(10);
}
private void rollSpare() {
g.roll(5);
g.roll(5);
}
}

public class Game {
private int rolls[] = new int[21];
private int currentRoll = 0;
public void roll(int pins) {
rolls[currentRoll++] = pins;
}
public int score() {
int score = 0;
int frameIndex = 0;
for (int frame = 0; frame < 10; frame++) {
if (isStrike(frameIndex)) {
score += 10 + strikeBonus(frameIndex);
frameIndex++;
} else if (isSpare(frameIndex)) {
score += 10 + spareBonus(frameIndex);
frameIndex += 2;
} else {
score += sumOfBallsInFrame(frameIndex);
frameIndex += 2;
}
}
return score;
}
private boolean isStrike(int frameIndex) {
return rolls[frameIndex] == 10;
}
private int sumOfBallsInFrame(int frameIndex) {
return rolls[frameIndex] + rolls[frameIndex+1];
}
private int spareBonus(int frameIndex) {
return rolls[frameIndex+2];
}
private int strikeBonus(int frameIndex) {
return rolls[frameIndex+1] + rolls[frameIndex+2];
}
private boolean isSpare(int frameIndex) {
return rolls[frameIndex]+rolls[frameIndex+1] == 10;
}
}

Слайд 52

The Fifth test.

...
public void testGutterGame() throws Exception {
rollMany(20, 0);

The Fifth test. ... public void testGutterGame() throws Exception { rollMany(20, 0);
assertEquals(0, g.score());
}
public void testAllOnes() throws Exception {
rollMany(20,1);
assertEquals(20, g.score());
}
public void testOneSpare() throws Exception {
rollSpare();
g.roll(3);
rollMany(17,0);
assertEquals(16,g.score());
}
public void testOneStrike() throws Exception {
rollStrike();
g.roll(3);
g.roll(4);
rollMany(16, 0);
assertEquals(24, g.score());
}
public void testPerfectGame() throws Exception {
rollMany(12,10);
assertEquals(300, g.score());
}
private void rollStrike() {
g.roll(10);
}
private void rollSpare() {
g.roll(5);
g.roll(5);
}
}

public class Game {
private int rolls[] = new int[21];
private int currentRoll = 0;
public void roll(int pins) {
rolls[currentRoll++] = pins;
}
public int score() {
int score = 0;
int frameIndex = 0;
for (int frame = 0; frame < 10; frame++) {
if (isStrike(frameIndex)) {
score += 10 + strikeBonus(frameIndex);
frameIndex++;
} else if (isSpare(frameIndex)) {
score += 10 + spareBonus(frameIndex);
frameIndex += 2;
} else {
score += sumOfBallsInFrame(frameIndex);
frameIndex += 2;
}
}
return score;
}
private boolean isStrike(int frameIndex) {
return rolls[frameIndex] == 10;
}
private int sumOfBallsInFrame(int frameIndex) {
return rolls[frameIndex] + rolls[frameIndex+1];
}
private int spareBonus(int frameIndex) {
return rolls[frameIndex+2];
}
private int strikeBonus(int frameIndex) {
return rolls[frameIndex+1] + rolls[frameIndex+2];
}
private boolean isSpare(int frameIndex) {
return rolls[frameIndex]+rolls[frameIndex+1] == 10;
}
}

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