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+---- Thread: [Java] Need Help with Java and Junit (/showthread.php?tid=5151075)
Need Help with Java and Junit - legenda008 - Jan 29, 2016
Ok guys I neeed quick help with my assigment I think it is not something difficult
You see I have to write Bowling Code kata
and I have writen the code for it
Here is my Bowling Class
Code
public class BowlingGame {
private int roll = 0;
private int [] rolls = new int[21];
public void roll(int...rolls){
for(int pinsDown:rolls){
if(pinsDown>10){
throw new IllegalArgumentException();
}else{
roll(pinsDown);
}
}
}
public void roll(int pinsDown){
rolls[roll++] =pinsDown;
}
public int score(){
int score = 0;
int cursor = 0;
for(int frame = 0;frame<10;frame++){
if(rolls[cursor]==10){ // check if it is strike
score+=10 + rolls[cursor+1] + rolls[cursor+2];
cursor++;
}else if(rolls[cursor] + rolls[cursor+1]==10){ // check if it is spare
score+=10 + rolls[cursor+2];
cursor+=2;
}else{
score+=rolls[cursor] + rolls[cursor+1];
cursor+=2;
}
}
return score;
}
}and here is my Test Class
Code
public class TestBowling {
private BowlingGame game;
@Before
public void setingUp(){
game = new BowlingGame();
}
@Test
public void canScore60(){
game.roll(3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3);
assertThat(game.score(), is(60));
}
@Test
public void canScorePerfect(){
game.roll(10,10,10,10,10,10,10,10,10,10,10,10);
assertThat(game.score(), is(300));
}
@Test
public void canScore67(){
game.roll(3,3,3,3,3,3,3,3,4,6,3,3,3,3,3,3, 3,3, 3,3);
assertThat(game.score(), is(67));
}
@Test
public void canScore75(){
game.roll(3,3,3,3,3,3,3,3,4,6,4,6,3,3,3,3, 3,3, 3,3);
assertThat(game.score(), is(75));
}
@Test
public void canScore70(){
game.roll(3,3,3,3,3,3,3,3,10,3,3,3,3,3,3, 3,3, 3,3);
assertThat(game.score(), is(70));
}
@Test
public void canScore87(){
game.roll(3,3,3,3,3,3,3,3,10,10,3,3,3,3,3, 3,3, 3,3);
assertThat(game.score(), is(87));
}
@Test
public void canScore70with10(){
game.roll(3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,10,3,3);
assertThat(game.score(), is(70));
}
@Test
public void canScore84(){
game.roll(3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,10,10,10);
assertThat(game.score(), is(84));
}
@Test
public void canScoreWith3and7(){
game.roll(3,7,3,7,3,7,3,7,3,7,3,7,3,7,3,7,3,7,3,7,3);
assertThat(game.score(), is(130));
}
//this tests should fail
@Test (expected = IllegalArgumentException.class)
public void testing15() {
int a = 15;
game.roll(a);
}
@Test (expected = IllegalArgumentException.class)
public void testingLetter() {
char c = 'c';
game.roll(c);
}
}I need to do this or My Question is how can I test this
Test wrong input with 15 for one throw
with two throws in the same frame bigger than 10
with a letter input
* - csrk - Jan 29, 2016
When using JUnit to test your code you want to create a new instance of BowlingGame in every test.
Code
@Test
public void methodname() {
BowlingGame bg = new GowlingGame(); // new one in every test, important
bg.roll... // do your rolls here. How you do them are irrelevant, the point is to get your game to a desired state.
assertTrue(bg.score() == 69); // finally, assert that the state of the game is what you expect it to be
}Unit testing means that for your input you state explicitly what you expect the state to be like. I am not going to do your homework for you but there are alot of other methods. I.e assertArrayEquals(array 1, array 2); assertFalse(bool);.
Also, remember to write alot of tests. You never do more than 1 assert in a single test. If the first assert fails and you have another one after that, the second assert will never be evaluated. You might think the 2nd one is the one that fails and spend time debugging a method that works. What you do is write two tests, use the exact same input and just assert for different things.
* - legenda008 - Jan 29, 2016
Ok i figured it out ,,but I have a new problem
how do i make that if two values in frame cannot be bigger then 10 .or
that the sum of throws in one frame cannot be bigger than 10
I hava made this code
for(int frame = 0;frame<10;frame++){
if(rolls[cursor] + rolls[cursor+1]>10){
throw new Illegal Argument Exception
}
if(rolls[cursor]==10){ // check if it is strike
score+=10 + rolls[cursor+1] + rolls[cursor+2];
cursor++;
}else if(rolls[cursor] + rolls[cursor+1]==10){ // check if it is spare
score+=10 + rolls[cursor+2];
cursor+=2;
}
else {
score+=rolls[cursor] + rolls[cursor+1];
cursor+=2;
}
}
return score;
}
but when I test it with Junit it is not working
@Test (expected = IllegalArgumentException.class)
public void testFrames(){
game.roll(8,8);
}
* - csrk - Jan 30, 2016
What do you mean is the problem, is the test not succeeding?
From what i understand about your code, if any of the inputs in rolls is above 10 (11 or higher) it will throw an exception. game.roll(8,8) should not throw an exception? I've not gone through your code entirely.