tests.js

//For demo purposes ofc
//
//globals all over the place and no test harness
//library makes this a bit messy but hope you should get the idea
var TEST_SIZE = 10;
var testBoard = initState(TEST_SIZE);

assertEquals(testBoard.length, TEST_SIZE, 'Correct Number of Rows');
assertEquals(testBoard[0].length, TEST_SIZE, 'Correct Number of Columns');

//init board with some state to test

//a cross pattern in the middle in this case
var crossPattern = [
  {x: 4, y: 4},
  {x: 4, y: 3},
  {x: 4, y: 5},
  {x: 3, y: 4},
  {x: 5, y: 4},
];

var dotPattern = [
  {x: 4, y: 4},
];

initPattern(testBoard, crossPattern);

//test board utils
assertEquals(getSurrounding(testBoard,4,4).length, 8, 'There are 8 surrounding cells in the middle');
assertEquals(getSurrounding(testBoard,0,0).length, 3, 'There are 3 surrounding cells in the corner');

assertEquals(countSurrounding(getSurrounding(testBoard,4,4)), 4, 'There are 4 active cells around the middle');
assertEquals(countSurrounding(getSurrounding(testBoard,0,0)), 0, 'There are 0 active cells around the corner');

//for the game rule tests a test harness would help with the setup/teardown before and after each of these tests
//so one test doesn't interfere with any of the others
testBoard = initState(TEST_SIZE);
initPattern(testBoard, dotPattern);
testBoard.forEach(function(row){
  row.forEach(function(cell){
    underPop(board, cell);
  });
});
updateStep(testBoard);
assertEquals(countSurrounding(getAllCells(testBoard)), 0, 'Underpop killed a cell');

//live test
testBoard = initState(TEST_SIZE);
initPattern(testBoard, crossPattern);
testBoard.forEach(function(row){
  row.forEach(function(cell){
    live(board, cell);
  });
});
updateStep(testBoard);
assertEquals(testBoard[3][4].state, ALIVE, 'Cell with 3 neighbors alive stayed alive');


function assertEquals(a, b, message){
  if(a === b){
    console.log(message + ' passed');
  }else{
    console.log(message + ' failed. a=' + a + ' b='+ b);
  }