如何使用Mocha Chai组织单元测试BDD的代码？

Question

I trying unit testing using Mocha/Chai using BDD style. Not sure where to start. Following is what the core code structure is. Assuming that getTemplates is an ajax call, how do I the different stages of an application. For ie before hitting sh.setTemplates() in init function, it has go through few conditions. How to unit test those conditions?

// Javascript     
function myFunc(id){
var mf = this;
mf.id = id;
mf.init = function(){return init()};
mf.isIdValid = function(){return isIdValid()};
mf.setTemplates = function(){return setTemplates};
mf.getTemplates = function(){return getTemplates};

// Init
mf.init();


///////////////////////
function init(){

    if(!id){
        return false;
    }


    if(!sh.isIdValid()){
        return false;
    }

    sh.setTemplates();
}


///////////////////////
function setTemplates(){
    getTemplates(function(callBackTemplate){
        if(!callbackTemplate){
            return false;
        }

        // inject to dom
    });
}

///////////////////////
// Async call
function getTemplates(){

    return '<div>Test</div>';
}
}



///////////////////////////////////////
/////////////////////////////////////////
TEST JS Mocha/Chai

var expect = chai.expect;

describe('myFunc Class', function(){
var mf;

before(function(){
    mf = new myFunc(1);
});


describe('mf.init()', function(){

    it('should not result false', function(){
        var result = mf.init();
        expect(result).to.not.equal(false);
    });


});

Answer 1

How to unit test those conditions?

Use the following process:

• Create a branch function
• Put the assertion in the branch function
• Use the variant as an argument
• Call it once with a truthy value
• Call it again with a falsy value

References

• BDD and Fluent Assertions
• Eclipse Orion: Running the Tests