Example of TDD with NodeJS

parcheesiTest.js

//This uses mocha + should.js for running the unit tests
it('should allow players to take out a Pawn when a five(5/x) is rolled', function() {
    //Since the dice throws random numnbers, we either need to throw it many times until
    //we get the value we want, or just overwrite it's functionality.
    //Here we chose to overwrite using the sinonJS mocking framework
    
    sinon.stub(game, 'throwDices').returns([5,4]);
    sinon.stub(game, 'lastDiceThrow').returns([5,4]);

    game.enterPawn(0);
    game.spaces[5].pawns.length.should.be.above(0);
});


//But I could have just done:
it('should allow players to take out a Pawn when a five(5/x) is rolled', function() {
    //instead of using a mocking framework I could just overwrite the original 
    //methods on the game object
    game.throwDices = function() {return [5,4]};
    game.lastDiceThrow = function() {return [5,4]};

    game.enterPawn(0);
    game.spaces[5].pawns.length.should.be.above(0);
});